1
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Chen YL, Taatjes CA, Meloni G. Estimate of the C-Cl photoionization cross section and absolute photoionization cross sections of chlorinated organic compounds. Chemphyschem 2024; 25:e202300896. [PMID: 38265931 DOI: 10.1002/cphc.202300896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 01/16/2024] [Accepted: 01/23/2024] [Indexed: 01/26/2024]
Abstract
Chlorinated organic compounds are prominently used for industrial production, but their vapors and emission byproducts can cause detrimental effects to human health and the environment. To accurately quantify organochlorine compounds, the absolute photoionization cross section of tetrachloroethylene, chlorobenzene, 1,2-dichlorobenzene, and chloroacetone are measured using multiplexed synchrotron photoionization mass spectrometry at the Advanced Light Source at Lawrence Berkeley National Laboratory. These measurements allow for the estimation of the C-Cl photoionization cross section, increasing quantification accuracy of chlorinated emissions for kinetic modeling and pollutant mitigation. CBS-QB3 calculations of adiabatic ionization energies and thermochemical appearance energies are also presented and agree well with the experimental results.
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Affiliation(s)
- Yilan Lori Chen
- Department of Chemistry, University of San Francisco, 94117, San Francisco, CA, USA
| | - Craig A Taatjes
- Combustion Research Facility, Sandia National Laboratories, 94550, Livermore, CA, USA
| | - Giovanni Meloni
- Department of Chemistry, University of San Francisco, 94117, San Francisco, CA, USA
- Department of Biological and Chemical Sciences, New York Institute of Technology, 11568, Old Westbury, NY, USA
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2
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Rodriguez R, Taatjes CA, Meloni G. Absolute Photoionization Cross Section and Dissociative Ionization Pathways of Alpha-Pinene. Chemphyschem 2024; 25:e202300891. [PMID: 38265929 DOI: 10.1002/cphc.202300891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 01/12/2024] [Accepted: 01/22/2024] [Indexed: 01/26/2024]
Abstract
The absolute photoionization cross section of the monoterpenoid, alpha-pinene (AP), is presented together with the relative photoionization cross sections of its dissociative fragments for the first time. Experiments are performed via multiplexed vacuum ultraviolet (VUV) synchrotron photoionization (PI) mass spectrometry in the 8.0-11.0 eV energy range. Experimental work is conducted at the Advanced Light Source of the Lawrence Berkeley National Laboratory. Dissociative fragments were identified at m/z 121, 94, 93, 92, and 80. The photoionization cross section for the parent mass at 11.0 eV was determined to be 17±4 Mb with a total ionization cross section of 92±23 Mb at the same photon energy. Experimental appearance energies of dissociative ionization fragments and potential dissociative ionization pathways calculated at the G4 level of theory are presented as well.
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Affiliation(s)
- Ryan Rodriguez
- Department of Chemistry, University of San Francisco, San Francisco, CA 94117, USA
| | - Craig A Taatjes
- Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551, USA
| | - Giovanni Meloni
- Department of Chemistry, University of San Francisco, San Francisco, CA 94117, USA
- Department of Biological and Chemical Sciences, New York Institute of Technology, Old Westbury, NY 11568, USA
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3
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Zou M, Liu T, Vansco MF, Sojdak CA, Markus CR, Almeida R, Au K, Sheps L, Osborn DL, Winiberg FAF, Percival CJ, Taatjes CA, Klippenstein SJ, Lester MI, Caravan RL. Bimolecular Reaction of Methyl-Ethyl-Substituted Criegee Intermediate with SO 2. J Phys Chem A 2023; 127:8994-9002. [PMID: 37870411 DOI: 10.1021/acs.jpca.3c04648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2023]
Abstract
Methyl-ethyl-substituted Criegee intermediate (MECI) is a four-carbon carbonyl oxide that is formed in the ozonolysis of some asymmetric alkenes. MECI is structurally similar to the isoprene-derived methyl vinyl ketone oxide (MVK-oxide) but lacks resonance stabilization, making it a promising candidate to help us unravel the effects of size, structure, and resonance stabilization that influence the reactivity of atmospherically important, highly functionalized Criegee intermediates. We present experimental and theoretical results from the first bimolecular study of MECI in its reaction with SO2, a reaction that shows significant sensitivity to the Criegee intermediate structure. Using multiplexed photoionization mass spectrometry, we obtain a rate coefficient of (1.3 ± 0.3) × 10-10 cm3 s-1 (95% confidence limits, 298 K, 10 Torr) and demonstrate the formation of SO3 under our experimental conditions. Through high-level theory, we explore the effect of Criegee intermediate structure on the minimum energy pathways for their reactions with SO2 and obtain modified Arrhenius fits to our predictions for the reaction of both syn and anti conformers of MECI with SO2 (ksyn = 4.42 × 1011 T-7.80exp(-1401/T) cm3 s-1 and kanti = 1.26 × 1011 T-7.55exp(-1397/T) cm3 s-1). Our experimental and theoretical rate coefficients (which are in reasonable agreement at 298 K) show that the reaction of MECI with SO2 is significantly faster than MVK-oxide + SO2, demonstrating the substantial effect of resonance stabilization on Criegee intermediate reactivity.
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Affiliation(s)
- Meijun Zou
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Tianlin Liu
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Michael F Vansco
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Christopher A Sojdak
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Charles R Markus
- NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Raybel Almeida
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States
| | - Kendrew Au
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States
| | - Leonid Sheps
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States
| | - David L Osborn
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States
- Department of Chemical Engineering, University of California, Davis, California 95616, United States
| | - Frank A F Winiberg
- NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
| | - Carl J Percival
- NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
| | - Craig A Taatjes
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States
| | - Stephen J Klippenstein
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Marsha I Lester
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Rebecca L Caravan
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
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4
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Liu T, Elliott SN, Zou M, Vansco MF, Sojdak CA, Markus CR, Almeida R, Au K, Sheps L, Osborn DL, Winiberg FAF, Percival CJ, Taatjes CA, Caravan RL, Klippenstein SJ, Lester MI. OH Roaming and Beyond in the Unimolecular Decay of the Methyl-Ethyl-Substituted Criegee Intermediate: Observations and Predictions. J Am Chem Soc 2023; 145:19405-19420. [PMID: 37623926 DOI: 10.1021/jacs.3c07126] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/26/2023]
Abstract
Alkene ozonolysis generates short-lived Criegee intermediates that are a significant source of hydroxyl (OH) radicals. This study demonstrates that roaming of the separating OH radicals can yield alternate hydroxycarbonyl products, thereby reducing the OH yield. Specifically, hydroxybutanone has been detected as a stable product arising from roaming in the unimolecular decay of the methyl-ethyl-substituted Criegee intermediate (MECI) under thermal flow cell conditions. The dynamical features of this novel multistage dissociation plus a roaming unimolecular decay process have also been examined with ab initio kinetics calculations. Experimentally, hydroxybutanone isomers are distinguished from the isomeric MECI by their higher ionization threshold and distinctive photoionization spectra. Moreover, the exponential rise of the hydroxybutanone kinetic time profile matches that for the unimolecular decay of MECI. A weaker methyl vinyl ketone (MVK) photoionization signal is also attributed to OH roaming. Complementary multireference electronic structure calculations have been utilized to map the unimolecular decay pathways for MECI, starting with 1,4 H atom transfer from a methyl or methylene group to the terminal oxygen, followed by roaming of the separating OH and butanonyl radicals in the long-range region of the potential. Roaming via reorientation and the addition of OH to the vinyl group of butanonyl is shown to yield hydroxybutanone, and subsequent C-O elongation and H-transfer can lead to MVK. A comprehensive theoretical kinetic analysis has been conducted to evaluate rate constants and branching yields (ca. 10-11%) for thermal unimolecular decay of MECI to conventional and roaming products under laboratory and atmospheric conditions, consistent with the estimated experimental yield (ca. 7%).
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Affiliation(s)
- Tianlin Liu
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Sarah N Elliott
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Meijun Zou
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Michael F Vansco
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Christopher A Sojdak
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Charles R Markus
- NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Raybel Almeida
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States
| | - Kendrew Au
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States
| | - Leonid Sheps
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States
| | - David L Osborn
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States
- Department of Chemical Engineering, University of California, Davis, California 95616, United States
| | - Frank A F Winiberg
- NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
| | - Carl J Percival
- NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
| | - Craig A Taatjes
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States
| | - Rebecca L Caravan
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Stephen J Klippenstein
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Marsha I Lester
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
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5
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Selby TM, Goulay F, Soorkia S, Ray A, Jasper AW, Klippenstein SJ, Morozov AN, Mebel AM, Savee JD, Taatjes CA, Osborn DL. Radical-Radical Reactions in Molecular Weight Growth: The Phenyl + Propargyl Reaction. J Phys Chem A 2023; 127:2577-2590. [PMID: 36905386 DOI: 10.1021/acs.jpca.2c08121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
The mechanism for hydrocarbon ring growth in sooting environments is still the subject of considerable debate. The reaction of phenyl radical (C6H5) with propargyl radical (H2CCCH) provides an important prototype for radical-radical ring-growth pathways. We studied this reaction experimentally over the temperature range of 300-1000 K and pressure range of 4-10 Torr using time-resolved multiplexed photoionization mass spectrometry. We detect both the C9H8 and C9H7 + H product channels and report experimental isomer-resolved product branching fractions for the C9H8 product. We compare these experiments to theoretical kinetics predictions from a recently published study augmented by new calculations. These ab initio transition state theory-based master equation calculations employ high-quality potential energy surfaces, conventional transition state theory for the tight transition states, and direct CASPT2-based variable reaction coordinate transition state theory (VRC-TST) for the barrierless channels. At 300 K only the direct adducts from radical-radical addition are observed, with good agreement between experimental and theoretical branching fractions, supporting the VRC-TST calculations of the barrierless entrance channel. As the temperature is increased to 1000 K we observe two additional isomers, including indene, a two-ring polycyclic aromatic hydrocarbon, and a small amount of bimolecular products C9H7 + H. Our calculated branching fractions for the phenyl + propargyl reaction predict significantly less indene than observed experimentally. We present further calculations and experimental evidence that the most likely cause of this discrepancy is the contribution of H atom reactions, both H + indenyl (C9H7) recombination to indene and H-assisted isomerization that converts less stable C9H8 isomers into indene. Especially at low pressures typical of laboratory investigations, H-atom-assisted isomerization needs to be considered. Regardless, the experimental observation of indene demonstrates that the title reaction leads, either directly or indirectly, to the formation of the second ring in polycyclic aromatic hydrocarbons.
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Affiliation(s)
- Talitha M Selby
- Department of Mathematics and Natural Sciences, University of Wisconsin-Milwaukee, West Bend, Wisconsin 53095, United States
| | - Fabien Goulay
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506, United States
| | - Satchin Soorkia
- Institut des Sciences Moléculaires d'Orsay, Université Paris-Saclay, CNRS, F-91405 Orsay, France
| | - Amelia Ray
- Department of Chemistry, University of Wisconsin-Parkside, Kenosha, Wisconsin 53144, United States
| | - Ahren W Jasper
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Stephen J Klippenstein
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Alexander N Morozov
- Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
| | - Alexander M Mebel
- Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
| | - John D Savee
- KLA Corporation, Milpitas, California 95035, United States
| | - Craig A Taatjes
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551, United States
| | - David L Osborn
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551, United States
- Department of Chemical Engineering, University of California, Davis, Davis, California 95616, United States
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6
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Couch DE, Mulvihill CR, Sivaramakrishnan R, Au K, Taatjes CA, Sheps L. Quantification of Key Peroxy and Hydroperoxide Intermediates in the Low-Temperature Oxidation of Dimethyl Ether. J Phys Chem A 2022; 126:9497-9509. [DOI: 10.1021/acs.jpca.2c06959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- David E. Couch
- Combustion Research Facility, Sandia National Laboratories, Livermore, California94551, United States
| | - Clayton R. Mulvihill
- Chemical Sciences and Engineering, Argonne National Laboratory, Lemont, Illinois60439, United States
| | - Raghu Sivaramakrishnan
- Chemical Sciences and Engineering, Argonne National Laboratory, Lemont, Illinois60439, United States
| | - Kendrew Au
- Combustion Research Facility, Sandia National Laboratories, Livermore, California94551, United States
| | - Craig A. Taatjes
- Combustion Research Facility, Sandia National Laboratories, Livermore, California94551, United States
| | - Leonid Sheps
- Combustion Research Facility, Sandia National Laboratories, Livermore, California94551, United States
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7
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Babikov D, Burke MP, Casavecchia P, Green WH, Grinberg Dana A, Guo H, Heard DE, Heathcote D, Hochlaf M, Jasper AW, Klippenstein SJ, Lester MI, Martí C, Mebel AM, Mullin AS, Nguyen TL, Olzmann M, Orr-Ewing AJ, Osborn DL, Robertson PA, Robinson MS, Shannon RJ, Shiels OJ, Suits AG, Taatjes CA, Troe J, Xu X, You X, Zhang F, Zhang RM, Zádor J. Collisional energy transfer: general discussion. Faraday Discuss 2022; 238:121-143. [PMID: 36200457 DOI: 10.1039/d2fd90048c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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8
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Popolan‐Vaida DM, Eskola AJ, Rotavera B, Lockyear JF, Wang Z, Sarathy SM, Caravan RL, Zádor J, Sheps L, Lucassen A, Moshammer K, Dagaut P, Osborn DL, Hansen N, Leone SR, Taatjes CA. Formation of Organic Acids and Carbonyl Compounds in
n
‐Butane Oxidation via γ‐Ketohydroperoxide Decomposition. Angew Chem Int Ed Engl 2022; 61:e202209168. [DOI: 10.1002/anie.202209168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Denisia M. Popolan‐Vaida
- Department of Chemistry and Physics University of California, Berkeley Berkeley CA 94720 USA
- Department of Chemistry University of Central Florida Orlando FL 32816 USA
| | - Arkke J. Eskola
- Combustion Research Facility Sandia National Laboratories Livermore CA 94551 USA
- Department of Chemistry University of Helsinki 00014 Helsinki Finland
| | - Brandon Rotavera
- Combustion Research Facility Sandia National Laboratories Livermore CA 94551 USA
- Department of Chemistry and College of Engineering University of Georgia Athens GA 30602 USA
| | - Jessica F. Lockyear
- Department of Chemistry and Physics University of California, Berkeley Berkeley CA 94720 USA
| | - Zhandong Wang
- King Abdullah University of Science and Technology (KAUST) Clean Combustion Research Center (CCRC) Thuwal 23955-6900 Saudi Arabia
- National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei Anhui 230029 P. R. China
| | - S. Mani Sarathy
- King Abdullah University of Science and Technology (KAUST) Clean Combustion Research Center (CCRC) Thuwal 23955-6900 Saudi Arabia
| | - Rebecca L. Caravan
- Combustion Research Facility Sandia National Laboratories Livermore CA 94551 USA
- Chemical Sciences and Engineering Division Argonne National Laboratory Lemont IL 60439 USA
| | - Judit Zádor
- Combustion Research Facility Sandia National Laboratories Livermore CA 94551 USA
| | - Leonid Sheps
- Combustion Research Facility Sandia National Laboratories Livermore CA 94551 USA
| | - Arnas Lucassen
- Combustion Research Facility Sandia National Laboratories Livermore CA 94551 USA
- Physikalisch-Technische Bundesanstalt 38116 Braunschweig Germany
| | - Kai Moshammer
- Combustion Research Facility Sandia National Laboratories Livermore CA 94551 USA
- Physikalisch-Technische Bundesanstalt 38116 Braunschweig Germany
| | - Philippe Dagaut
- Centre National de la Recherche Scientifique (CNRS) INSIS ICARE 45071 Orléans Cedex 2 France
| | - David L. Osborn
- Combustion Research Facility Sandia National Laboratories Livermore CA 94551 USA
| | - Nils Hansen
- Combustion Research Facility Sandia National Laboratories Livermore CA 94551 USA
| | - Stephen R. Leone
- Department of Chemistry and Physics University of California, Berkeley Berkeley CA 94720 USA
| | - Craig A. Taatjes
- Combustion Research Facility Sandia National Laboratories Livermore CA 94551 USA
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9
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Popolan-Vaida DM, Eskola AJ, Rotavera B, Lockyear JF, Wang Z, Sarathy SM, Caravan RL, Zádor J, Sheps L, Lucassen A, Moshammer K, Dagaut P, Osborn DL, Hansen N, Leone SR, Taatjes CA. Formation of Organic Acids and Carbonyl Compounds in n‐Butane Oxidation via γ‐Ketohydroperoxide Decomposition. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202209168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Arkke J. Eskola
- University of Helsinki City Centre Campus: Helsingin Yliopisto Chemistry 00014 Helsinki FINLAND
| | | | - Jessica F. Lockyear
- University of California Berkeley College of Chemistry Chemistry 94720 Berkeley UNITED STATES
| | - Zhandong Wang
- University of Science and Technology of China Chemistry 230029 Hefei CHINA
| | - S. Mani Sarathy
- King Abdullah University of Science and Technology Clean Combustion Research Center 23955-6900 Thuwal SAUDI ARABIA
| | - Rebecca L. Caravan
- Argonne National Laboratory Chemical Sciences and Engineering Division 60439 Lemont UNITED STATES
| | - Judit Zádor
- Sandia National Laboratories California Combustion Research Facility 94551 Livermore UNITED STATES
| | - Leonid Sheps
- Sandia National Laboratories California Combustion Research Facility 94551 Livermore UNITED STATES
| | - Arnas Lucassen
- Physikalisch-Technische Bundesanstalt Prevention of Ignition Sources 38116 Braunschweig GERMANY
| | - Kai Moshammer
- Physikalisch-Technische Bundesanstalt Prevention of Ignition Sources 38116 Braunschweig GERMANY
| | - Philippe Dagaut
- Centre National de la Recherche Scientifique INSIS, ICARE 45071 Orléans Cedex FRANCE
| | - David L. Osborn
- Sandia National Laboratories California Combustion Research Facility 94551 Livermore UNITED STATES
| | - Nils Hansen
- Sandia National Laboratories California Combustion Research Facility 94551 Livermore UNITED STATES
| | - Stephen R. Leone
- University of California Berkeley College of Chemistry Chemistry 94720 Berkeley UNITED STATES
| | - Craig A. Taatjes
- Sandia National Laboratories California Combustion Research Facility 94551 Livermore UNITED STATES
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10
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Bodi A, Burke MP, Butler AA, Douglas K, Eskola AJ, Green WH, Guo H, Heard DE, Heathcote D, Hochlaf M, Klippenstein SJ, Kuwata KT, Lawrence JE, Lester MI, Lourderaj U, Mebel A, Milesevic D, Mullin AS, Nguyen TL, Olzmann M, Orr-Ewing AJ, Osborn DL, Pazdera TM, Pfeifle M, Plane JMC, Pun R, Robertson PA, Robinson MS, Seakins PW, Shannon RJ, Taatjes CA, Troe J, Vallance C, Welz O, Zádor J, Zhang F. Impact of Lindemann and related theories: general discussion. Faraday Discuss 2022; 238:700-740. [DOI: 10.1039/d2fd90051c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Vansco MF, Zou M, Antonov IO, Ramasesha K, Rotavera B, Osborn DL, Georgievskii Y, Percival CJ, Klippenstein SJ, Taatjes CA, Lester MI, Caravan RL. Dramatic Conformer-Dependent Reactivity of the Acetaldehyde Oxide Criegee Intermediate with Dimethylamine Via a 1,2-Insertion Mechanism. J Phys Chem A 2021; 126:710-719. [PMID: 34939803 DOI: 10.1021/acs.jpca.1c08941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reactivity of carbonyl oxides has previously been shown to exhibit strong conformer and substituent dependencies. Through a combination of synchrotron-multiplexed photoionization mass spectrometry experiments (298 K and 4 Torr) and high-level theory [CCSD(T)-F12/cc-pVTZ-F12//B2PLYP-D3/cc-pVTZ with an added CCSDT(Q) correction], we explore the conformer dependence of the reaction of acetaldehyde oxide (CH3CHOO) with dimethylamine (DMA). The experimental data support the theoretically predicted 1,2-insertion mechanism and the formation of an amine-functionalized hydroperoxide reaction product. Tunable-vacuum ultraviolet photoionization probing of anti- or anti- + syn-CH3CHOO reveals a strong conformer dependence of the title reaction. The rate coefficient of DMA with anti-CH3CHOO is predicted to exceed that for the reaction with syn-CH3CHOO by a factor of ∼34,000, which is attributed to submerged barrier (syn) versus barrierless (anti) mechanisms for energetically downhill reactions.
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Affiliation(s)
- Michael F Vansco
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Meijun Zou
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Ivan O Antonov
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208-3112, United States.,Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States
| | - Krupa Ramasesha
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States
| | - Brandon Rotavera
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States.,School of Environmental, Civil, Agricultural, and Mechanical Engineering, University of Georgia, Athens, Georgia 30602, United States.,Department of Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - David L Osborn
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States.,Department of Chemical Engineering, University of California, Davis, California 95616, United States
| | - Yuri Georgievskii
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Carl J Percival
- NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
| | - Stephen J Klippenstein
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Craig A Taatjes
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States
| | - Marsha I Lester
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Rebecca L Caravan
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States.,Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551, United States
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12
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Couch DE, Zhang AJ, Taatjes CA, Hansen N. Experimental Observation of Hydrocarbon Growth by Resonance‐Stabilized Radical–Radical Chain Reaction. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202110929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- David E. Couch
- Gas Phase Chemical Physics Department Combustion Research Facility Sandia National Laboratories Livermore CA 94550 USA
| | - Angie J. Zhang
- Gas Phase Chemical Physics Department Combustion Research Facility Sandia National Laboratories Livermore CA 94550 USA
| | - Craig A. Taatjes
- Gas Phase Chemical Physics Department Combustion Research Facility Sandia National Laboratories Livermore CA 94550 USA
| | - Nils Hansen
- Gas Phase Chemical Physics Department Combustion Research Facility Sandia National Laboratories Livermore CA 94550 USA
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13
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Couch DE, Zhang AJ, Taatjes CA, Hansen N. Experimental Observation of Hydrocarbon Growth by Resonance-Stabilized Radical-Radical Chain Reaction. Angew Chem Int Ed Engl 2021; 60:27230-27235. [PMID: 34605134 DOI: 10.1002/anie.202110929] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Indexed: 01/08/2023]
Abstract
Rapid molecular-weight growth of hydrocarbons occurs in flames, in industrial synthesis, and potentially in cold astrochemical environments. A variety of high- and low-temperature chemical mechanisms have been proposed and confirmed, but more facile pathways may be needed to explain observations. We provide laboratory confirmation in a controlled pyrolysis environment of a recently proposed mechanism, radical-radical chain reactions of resonance-stabilized species. The recombination reaction of phenyl (c-C6 H5 ) and benzyl (c-C6 H5 CH2 ) radicals produces both diphenylmethane and diphenylmethyl radicals, the concentration of the latter increasing with rising temperature. A second phenyl addition to the product radical forms both triphenylmethane and triphenylmethyl radicals, confirming the propagation of radical-radical chain reactions under the experimental conditions of high temperature (1100-1600 K) and low pressure (ca. 3 kPa). Similar chain reactions may contribute to particle growth in flames, the interstellar medium, and industrial reactors.
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Affiliation(s)
- David E Couch
- Gas Phase Chemical Physics Department, Combustion Research Facility, Sandia National Laboratories, Livermore, CA, 94550, USA
| | - Angie J Zhang
- Gas Phase Chemical Physics Department, Combustion Research Facility, Sandia National Laboratories, Livermore, CA, 94550, USA
| | - Craig A Taatjes
- Gas Phase Chemical Physics Department, Combustion Research Facility, Sandia National Laboratories, Livermore, CA, 94550, USA
| | - Nils Hansen
- Gas Phase Chemical Physics Department, Combustion Research Facility, Sandia National Laboratories, Livermore, CA, 94550, USA
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14
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Rösch D, Caravan RL, Taatjes CA, Au K, Almeida R, Osborn DL. Absolute Photoionization Cross Section of the Simplest Enol, Vinyl Alcohol. J Phys Chem A 2021; 125:7920-7928. [PMID: 34468152 DOI: 10.1021/acs.jpca.1c05825] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The absolute photoionization cross section of vinyl alcohol was determined by multiplexed photoionization mass spectrometry of the Norrish type II photodissociation of butanal at 308 nm. The measured cross sections at 10.005 and 10.205 eV are 7.5 ± 1.9 and 8.1 ± 1.9 MB, respectively. A higher signal-to-noise ratio photoionization spectrum of vinyl alcohol was recorded via the pyrolysis of 2-chloroethanol and scaled to the absolute cross sections measured using the Norrish type II method. From a comparison of our spectrum with previously reported photoelectron spectra we conclude that vinyl alcohol is mainly ionized by direct ionization in the energy range of 9-9.6 eV, whereas autoionization is responsible for the steady rise in the photoionization spectrum above the end of the Franck-Condon envelope at 9.9 eV.
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Affiliation(s)
- Daniel Rösch
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - Rebecca L Caravan
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Craig A Taatjes
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - Kendrew Au
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - Raybel Almeida
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - David L Osborn
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States.,Department of Chemical Engineering, University of California Davis, Davis, California 95616, United States
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15
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Taatjes CA, Caravan RL, Winiberg FAF, Zuraski K, Au K, Sheps L, Osborn DL, Vereecken L, Percival CJ. Insertion products in the reaction of carbonyl oxide Criegee intermediates with acids: Chloro(hydroperoxy)methane formation from reaction of CH2OO with HCl and DCl. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1975199] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Craig A. Taatjes
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, USA
| | - Rebecca L. Caravan
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, USA
- NASA Postdoctoral Program Fellow, NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, USA
| | - Frank A. F. Winiberg
- NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
- California Institute of Technology, Pasadena, CA, USA
| | - Kristen Zuraski
- NASA Postdoctoral Program Fellow, NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - Kendrew Au
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, USA
| | - Leonid Sheps
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, USA
| | - David L. Osborn
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, USA
- Department of Chemical Engineering, University of California, Davis, CA, USA
| | - Luc Vereecken
- Institute of Energy and Climate Research, Forschungszentrum Jülich GmbH, Jülich, Germany
| | - Carl J. Percival
- NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
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16
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Vansco MF, Zuraski K, Winiberg FAF, Au K, Trongsiriwat N, Walsh PJ, Osborn DL, Percival CJ, Klippenstein SJ, Taatjes CA, Lester MI, Caravan RL. Functionalized Hydroperoxide Formation from the Reaction of Methacrolein-Oxide, an Isoprene-Derived Criegee Intermediate, with Formic Acid: Experiment and Theory. Molecules 2021; 26:3058. [PMID: 34065491 PMCID: PMC8161369 DOI: 10.3390/molecules26103058] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 05/11/2021] [Accepted: 05/13/2021] [Indexed: 11/16/2022] Open
Abstract
Methacrolein oxide (MACR-oxide) is a four-carbon, resonance-stabilized Criegee intermediate produced from isoprene ozonolysis, yet its reactivity is not well understood. This study identifies the functionalized hydroperoxide species, 1-hydroperoxy-2-methylallyl formate (HPMAF), generated from the reaction of MACR-oxide with formic acid using multiplexed photoionization mass spectrometry (MPIMS, 298 K = 25 °C, 10 torr = 13.3 hPa). Electronic structure calculations indicate the reaction proceeds via an energetically favorable 1,4-addition mechanism. The formation of HPMAF is observed by the rapid appearance of a fragment ion at m/z 99, consistent with the proposed mechanism and characteristic loss of HO2 upon photoionization of functional hydroperoxides. The identification of HPMAF is confirmed by comparison of the appearance energy of the fragment ion with theoretical predictions of its photoionization threshold. The results are compared to analogous studies on the reaction of formic acid with methyl vinyl ketone oxide (MVK-oxide), the other four-carbon Criegee intermediate in isoprene ozonolysis.
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Affiliation(s)
- Michael F. Vansco
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, USA; (M.F.V.); (N.T.); (P.J.W.)
- Argonne National Laboratory, Chemical Sciences and Engineering Division, Lemont, IL 60439, USA;
| | - Kristen Zuraski
- NASA Postdoctoral Program Fellow, NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA;
| | - Frank A. F. Winiberg
- NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA; (F.A.F.W.); (C.J.P.)
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Kendrew Au
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA 94551, USA; (K.A.); (D.L.O.)
| | - Nisalak Trongsiriwat
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, USA; (M.F.V.); (N.T.); (P.J.W.)
| | - Patrick J. Walsh
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, USA; (M.F.V.); (N.T.); (P.J.W.)
| | - David L. Osborn
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA 94551, USA; (K.A.); (D.L.O.)
- Department of Chemical Engineering, University of California, Davis, CA 95616, USA
| | - Carl J. Percival
- NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA; (F.A.F.W.); (C.J.P.)
| | - Stephen J. Klippenstein
- Argonne National Laboratory, Chemical Sciences and Engineering Division, Lemont, IL 60439, USA;
| | - Craig A. Taatjes
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA 94551, USA; (K.A.); (D.L.O.)
| | - Marsha I. Lester
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, USA; (M.F.V.); (N.T.); (P.J.W.)
| | - Rebecca L. Caravan
- Argonne National Laboratory, Chemical Sciences and Engineering Division, Lemont, IL 60439, USA;
- NASA Postdoctoral Program Fellow, NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA;
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17
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Abstract
We have used 308 nm photolysis of acetaldehyde to measure a photoionization spectrum of the formyl (HCO) radical between 8 and 11.5 eV using an 11 meV FWHM photoionization energy resolution. We have confirmed that the formyl radical is the carrier of the spectrum by generating an identical spectrum of the HCO product in the Cl + H2CO reaction. The spectrum of HCO and its deuterated isotopologue (DCO) have several resolved autoionizing resonances above the Franck-Condon envelope, which we assign to autoionization after initial excitation into neutral 3sσ and 3p Rydberg states converging to the first triplet excited state of HCO+(ã 3A'). The quantum defects for these states are δ3sσ = 1.06 ± 0.02 and δ3p = 0.821 ± 0.019. We report absolute photoionization cross-section measurements of σHCOPI(9.907 eV) = 4.5 ± 0.9 Mb, σHCOPI(10.007 eV) = 4.8 ± 1.0 Mb, σHCOPI(10.107 eV) = 6.0 ± 1.2 Mb, σHCOPI(10.107 eV) = 5.7 ± 1.2 Mb, and σHCOPI(10.304 eV) = 10.6 ± 2.2 Mb relative to the photoionization cross section of the methyl radical. The absolute cross-section measurements are a factor of ∼1.5 larger than those determined in past studies, although the presence of strong autoionizing features supports a dependence on photoionization energy resolution. We propose that the semiempirical model of Xu and Pratt for estimation of free radical photoionization cross sections is more accurate when applied with a reference species containing the same atoms as the free radical rather than isoelectronic species with different atoms.
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Affiliation(s)
- John D Savee
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - Bálint Sztáray
- Department of Chemistry, University of the Pacific, Stockton, California 95211, United States
| | - Oliver Welz
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - Craig A Taatjes
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - David L Osborn
- Combustion Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States.,Department of Chemical Engineering, University of California, Davis, Davis, California 95616, United States
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18
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Shiels OJ, Prendergast MB, Savee JD, Osborn DL, Taatjes CA, Blanksby SJ, da Silva G, Trevitt AJ. Five vs. six membered-ring PAH products from reaction of o-methylphenyl radical and two C 3H 4 isomers. Phys Chem Chem Phys 2021; 23:14913-14924. [PMID: 34223848 DOI: 10.1039/d1cp01764k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Gas-phase reactions of the o-methylphenyl (o-CH3C6H4) radical with the C3H4 isomers allene (H2C[double bond, length as m-dash]C[double bond, length as m-dash]CH2) and propyne (HC[triple bond, length as m-dash]C-CH3) are studied at 600 K and 4 Torr (533 Pa) using VUV synchrotron photoionisation mass spectrometry, quantum chemical calculations and RRKM modelling. Two major dissociation product ions arise following C3H4 addition: m/z 116 (CH3 loss) and 130 (H loss). These products correspond to small polycyclic aromatic hydrocarbons (PAHs). The m/z 116 signal for both reactions is conclusively assigned to indene (C9H8) and is the dominant product for the propyne reaction. Signal at m/z 130 for the propyne case is attributed to isomers of bicyclic methylindene (C10H10) + H, which contains a newly-formed methylated five-membered ring. The m/z 130 signal for allene, however, is dominated by the 1,2-dihydronaphthalene isomer arising from a newly created six-membered ring. Our results show that new ring formation from C3H4 addition to the methylphenyl radical requires an ortho-CH3 group - similar to o-methylphenyl radical oxidation. These reactions characteristically lead to bicyclic aromatic products, but the structure of the C3H4 co-reactant dictates the structure of the PAH product, with allene preferentially leading to the formation of two six-membered ring bicyclics and propyne resulting in the formation of six and five-membered bicyclic structures.
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Affiliation(s)
- Oisin J Shiels
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, 2522, Australia.
| | - Matthew B Prendergast
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, 2522, Australia.
| | - John D Savee
- Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551-0969, USA
| | - David L Osborn
- Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551-0969, USA
| | - Craig A Taatjes
- Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551-0969, USA
| | - Stephen J Blanksby
- Central Analytical Research Facility, Queensland University of Technology, Brisbane, 4001, Australia
| | - Gabriel da Silva
- Department of Chemical Engineering, The University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - Adam J Trevitt
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, 2522, Australia.
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19
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Vansco MF, Caravan RL, Pandit S, Zuraski K, Winiberg FAF, Au K, Bhagde T, Trongsiriwat N, Walsh PJ, Osborn DL, Percival CJ, Klippenstein SJ, Taatjes CA, Lester MI. Formic acid catalyzed isomerization and adduct formation of an isoprene-derived Criegee intermediate: experiment and theory. Phys Chem Chem Phys 2020; 22:26796-26805. [PMID: 33211784 DOI: 10.1039/d0cp05018k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Isoprene is the most abundant non-methane hydrocarbon emitted into the Earth's atmosphere. Ozonolysis is an important atmospheric sink for isoprene, which generates reactive carbonyl oxide species (R1R2C[double bond, length as m-dash]O+O-) known as Criegee intermediates. This study focuses on characterizing the catalyzed isomerization and adduct formation pathways for the reaction between formic acid and methyl vinyl ketone oxide (MVK-oxide), a four-carbon unsaturated Criegee intermediate generated from isoprene ozonolysis. syn-MVK-oxide undergoes intramolecular 1,4 H-atom transfer to form a substituted vinyl hydroperoxide intermediate, 2-hydroperoxybuta-1,3-diene (HPBD), which subsequently decomposes to hydroxyl and vinoxylic radical products. Here, we report direct observation of HPBD generated by formic acid catalyzed isomerization of MVK-oxide under thermal conditions (298 K, 10 torr) using multiplexed photoionization mass spectrometry. The acid catalyzed isomerization of MVK-oxide proceeds by a double hydrogen-bonded interaction followed by a concerted H-atom transfer via submerged barriers to produce HPBD and regenerate formic acid. The analogous isomerization pathway catalyzed with deuterated formic acid (D2-formic acid) enables migration of a D atom to yield partially deuterated HPBD (DPBD), which is identified by its distinct mass (m/z 87) and photoionization threshold. In addition, bimolecular reaction of MVK-oxide with D2-formic acid forms a functionalized hydroperoxide adduct, which is the dominant product channel, and is compared to a previous bimolecular reaction study with normal formic acid. Complementary high-level theoretical calculations are performed to further investigate the reaction pathways and kinetics.
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Affiliation(s)
- Michael F Vansco
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, USA.
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20
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Doner AC, Davis MM, Koritzke AL, Christianson MG, Turney JM, Schaefer HF, Sheps L, Osborn DL, Taatjes CA, Rotavera B. Isomer‐dependent reaction mechanisms of cyclic ether intermediates:cis‐2,3‐dimethyloxirane andtrans‐2,3‐dimethyloxirane. INT J CHEM KINET 2020. [DOI: 10.1002/kin.21429] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Anna C. Doner
- Department of Chemistry University of Georgia Athens GA USA
| | - Matthew M. Davis
- Department of Chemistry University of Georgia Athens GA USA
- Center for Computational Quantum Chemistry University of Georgia Athens GA USA
| | | | | | - Justin M. Turney
- Center for Computational Quantum Chemistry University of Georgia Athens GA USA
| | - Henry F. Schaefer
- Department of Chemistry University of Georgia Athens GA USA
- Center for Computational Quantum Chemistry University of Georgia Athens GA USA
| | - Leonid Sheps
- Combustion Research Facility Sandia National Laboratories Livermore CA USA
| | - David L. Osborn
- Combustion Research Facility Sandia National Laboratories Livermore CA USA
| | - Craig A. Taatjes
- Combustion Research Facility Sandia National Laboratories Livermore CA USA
| | - Brandon Rotavera
- Department of Chemistry University of Georgia Athens GA USA
- College of Engineering University of Georgia Athens GA USA
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21
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Christianson MG, Doner AC, Davis MM, Koritzke AL, Turney JM, Schaefer HF, Sheps L, Osborn DL, Taatjes CA, Rotavera B. Reaction mechanisms of a cyclic ether intermediate: Ethyloxirane. INT J CHEM KINET 2020. [DOI: 10.1002/kin.21423] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
| | - Anna C. Doner
- Department of Chemistry University of Georgia Athens Georgia
| | - Matthew M. Davis
- Department of Chemistry University of Georgia Athens Georgia
- Center for Computational Quantum Chemistry University of Georgia Athens Georgia
| | | | - Justin M. Turney
- Center for Computational Quantum Chemistry University of Georgia Athens Georgia
| | - Henry F. Schaefer
- Department of Chemistry University of Georgia Athens Georgia
- Center for Computational Quantum Chemistry University of Georgia Athens Georgia
| | - Leonid Sheps
- Combustion Research Facility Sandia National Laboratories Livermore California
| | - David L. Osborn
- Combustion Research Facility Sandia National Laboratories Livermore California
| | - Craig A. Taatjes
- Combustion Research Facility Sandia National Laboratories Livermore California
| | - Brandon Rotavera
- Department of Chemistry University of Georgia Athens Georgia
- College of Engineering University of Georgia Athens Georgia
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22
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Affiliation(s)
| | | | - Craig A. Taatjes
- Combustion Research Facility, Sandia National Laboratories, Livermore, CA, USA
| | - Carl J. Percival
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
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23
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Vansco MF, Caravan RL, Zuraski K, Winiberg FAF, Au K, Trongsiriwat N, Walsh PJ, Osborn DL, Percival CJ, Khan MAH, Shallcross DE, Taatjes CA, Lester MI. Experimental Evidence of Dioxole Unimolecular Decay Pathway for Isoprene-Derived Criegee Intermediates. J Phys Chem A 2020; 124:3542-3554. [PMID: 32255634 DOI: 10.1021/acs.jpca.0c02138] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Ozonolysis of isoprene, one of the most abundant volatile organic compounds emitted into the Earth's atmosphere, generates two four-carbon unsaturated Criegee intermediates, methyl vinyl ketone oxide (MVK-oxide) and methacrolein oxide (MACR-oxide). The extended conjugation between the vinyl substituent and carbonyl oxide groups of these Criegee intermediates facilitates rapid electrocyclic ring closures that form five-membered cyclic peroxides, known as dioxoles. This study reports the first experimental evidence of this novel decay pathway, which is predicted to be the dominant atmospheric sink for specific conformational forms of MVK-oxide (anti) and MACR-oxide (syn) with the vinyl substituent adjacent to the terminal O atom. The resulting dioxoles are predicted to undergo rapid unimolecular decay to oxygenated hydrocarbon radical products, including acetyl, vinoxy, formyl, and 2-methylvinoxy radicals. In the presence of O2, these radicals rapidly react to form peroxy radicals (ROO), which quickly decay via carbon-centered radical intermediates (QOOH) to stable carbonyl products that were identified in this work. The carbonyl products were detected under thermal conditions (298 K, 10 Torr He) using multiplexed photoionization mass spectrometry (MPIMS). The main products (and associated relative abundances) originating from unimolecular decay of anti-MVK-oxide and subsequent reaction with O2 are formaldehyde (88 ± 5%), ketene (9 ± 1%), and glyoxal (3 ± 1%). Those identified from the unimolecular decay of syn-MACR-oxide and subsequent reaction with O2 are acetaldehyde (37 ± 7%), vinyl alcohol (9 ± 1%), methylketene (2 ± 1%), and acrolein (52 ± 5%). In addition to the stable carbonyl products, the secondary peroxy chemistry also generates OH or HO2 radical coproducts.
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Affiliation(s)
- Michael F Vansco
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Rebecca L Caravan
- NASA Postdoctoral Program, NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States.,Combustion Research Facility, Sandia National Laboratories, Mailstop 9055, Livermore, California 94551, United States.,Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Kristen Zuraski
- NASA Postdoctoral Program, NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
| | - Frank A F Winiberg
- NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States.,California Institute of Technology, Pasadena, California 91125, United States
| | - Kendrew Au
- Combustion Research Facility, Sandia National Laboratories, Mailstop 9055, Livermore, California 94551, United States
| | - Nisalak Trongsiriwat
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Patrick J Walsh
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - David L Osborn
- Combustion Research Facility, Sandia National Laboratories, Mailstop 9055, Livermore, California 94551, United States
| | - Carl J Percival
- NASA Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States.,California Institute of Technology, Pasadena, California 91125, United States
| | - M Anwar H Khan
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Dudley E Shallcross
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Craig A Taatjes
- Combustion Research Facility, Sandia National Laboratories, Mailstop 9055, Livermore, California 94551, United States
| | - Marsha I Lester
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
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24
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Davis JC, Koritzke AL, Caravan RL, Antonov IO, Christianson MG, Doner AC, Osborn DL, Sheps L, Taatjes CA, Rotavera B. Influence of the Ether Functional Group on Ketohydroperoxide Formation in Cyclic Hydrocarbons: Tetrahydropyran and Cyclohexane. J Phys Chem A 2019; 123:3634-3646. [PMID: 30865470 DOI: 10.1021/acs.jpca.8b12510] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Photolytically initiated oxidation experiments were conducted on cyclohexane and tetrahydropyran using multiplexed photoionization mass spectrometry to assess the impact of the ether functional group in the latter species on reaction mechanisms relevant to autoignition. Pseudo-first-order conditions, with [O2]0:[R•]0 > 2000, were used to ensure that R• + O2 → products were the dominant reactions. Quasi-continuous, tunable vacuum ultraviolet light from a synchrotron was employed over the range 8.0-11.0 eV to measure photoionization spectra of the products at two pressures (10 and 1520 Torr) and three temperatures (500, 600, and 700 K). Photoionization spectra of ketohydroperoxides were measured in both species and were qualitatively identical, within the limit of experimental noise, to those of analogous species formed in n-butane oxidation. However, differences were noted in the temperature dependence of ketohydroperoxide formation between the two species. Whereas the yield from cyclohexane is evident up to 700 K, ketohydroperoxides in tetrahydropyran were not detected above 650 K. The difference indicates that reaction mechanisms change due to the ether group, likely affecting the requisite •QOOH + O2 addition step. Branching fractions of nine species from tetrahydropyran were quantified with the objective of determining the role of ring-opening reactions in diminishing ketohydroperoxide. The results indicate that products formed from unimolecular decomposition of R• and •QOOH radicals via concerted C-C and C-O β-scission are pronounced in tetrahydropyran and are insignificant in cyclohexane oxidation. The main conclusion drawn is that, under the conditions herein, ring-opening pathways reduce the already low steady-state concentration of •QOOH, which in the case of tetrahydropyran prevents •QOOH + O2 reactions necessary for ketohydroperoxide formation. Carbon balance calculations reveal that products from ring opening of both R• and •QOOH, at 700 K, account for >70% at 10 Torr and >55% at 1520 Torr. Three pathways are confirmed to contribute to the depletion of •QOOH in tetrahydropyran including (i) γ-•QOOH → pentanedial + •OH, (ii) γ-•QOOH → vinyl formate + ethene + •OH, and (iii) γ-•QOOH → 3-butenal + formaldehyde + •OH. Analogous mechanisms in cyclohexane oxidation leading to similar intermediates are compared and, on the basis of mass spectral results, confirm that no such ring-opening reactions occur. The implication from the comparison to cyclohexane is that the ether group in tetrahydropyran increases the propensity for ring-opening reactions and inhibits the formation of ketohydroperoxide isomers that precede chain-branching. On the contrary, the absence of such reactions in cyclohexane enables ketohydroperoxide formation up to 700 K and perhaps higher temperature.
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Affiliation(s)
| | | | - Rebecca L Caravan
- Combustion Research Facility , Sandia National Laboratories , Livermore , California 94551 , United States
| | - Ivan O Antonov
- Combustion Research Facility , Sandia National Laboratories , Livermore , California 94551 , United States
| | | | | | - David L Osborn
- Combustion Research Facility , Sandia National Laboratories , Livermore , California 94551 , United States
| | - Leonid Sheps
- Combustion Research Facility , Sandia National Laboratories , Livermore , California 94551 , United States
| | - Craig A Taatjes
- Combustion Research Facility , Sandia National Laboratories , Livermore , California 94551 , United States
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Taatjes CA, Khan MAH, Eskola AJ, Percival CJ, Osborn DL, Wallington TJ, Shallcross DE. Reaction of Perfluorooctanoic Acid with Criegee Intermediates and Implications for the Atmospheric Fate of Perfluorocarboxylic Acids. Environ Sci Technol 2019; 53:1245-1251. [PMID: 30589541 DOI: 10.1021/acs.est.8b05073] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The reaction of perfluorooctanoic acid with the smallest carbonyl oxide Criegee intermediate, CH2OO, has been measured and is very rapid, with a rate coefficient of (4.9 ± 0.8) × 10-10 cm3 s-1, similar to that for reactions of Criegee intermediates with other organic acids. Evidence is shown for the formation of hydroperoxymethyl perfluorooctanoate as a product. With such a large rate coefficient, reaction with Criegee intermediates can be a substantial contributor to atmospheric removal of perfluorocarboxylic acids. However, the atmospheric fates of the ester product largely regenerate the initial acid reactant. Wet deposition regenerates the perfluorocarboxylic acid via condensed-phase hydrolysis. Gas-phase reaction with OH is expected principally to result in formation of the acid anhydride, which also hydrolyzes to regenerate the acid, although a minor channel could lead to destruction of the perfluorinated backbone.
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Affiliation(s)
- Craig A Taatjes
- Combustion Research Facility, Mail Stop 9055 , Sandia National Laboratories, Livermore , California 94551-0969 United States
| | - M Anwar H Khan
- School of Chemistry , The University of Bristol , Cantock's Close BS8 1TS , Bristol , U.K
| | - Arkke J Eskola
- Combustion Research Facility, Mail Stop 9055 , Sandia National Laboratories, Livermore , California 94551-0969 United States
- Department of Chemistry , University of Helsinki , P.O. Box 55 (A.I. Virtasen aukio 1) , FI-00014 Helsinki , Finland
| | - Carl J Percival
- The Centre for Atmospheric Science, The School of Earth, Atmospheric and Environmental Science , The University of Manchester , Simon Building, Brunswick Street , Manchester , M13 9PL , U.K
- Jet Propulsion Laboratory , California Institute of Technology , 4800 Oak Grove Drive , Pasadena , California 91109 United States
| | - David L Osborn
- Combustion Research Facility, Mail Stop 9055 , Sandia National Laboratories, Livermore , California 94551-0969 United States
| | - Timothy J Wallington
- Research & Advanced Engineering , Ford Motor Company , Dearborn , Michigan 48121 United States
| | - Dudley E Shallcross
- School of Chemistry , The University of Bristol , Cantock's Close BS8 1TS , Bristol , U.K
- Department of Chemistry , University of the Western Cape , Robert Sobukwe Road , Bellville 7535 , South Africa
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26
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Prendergast MB, Kirk BB, Savee JD, Osborn DL, Taatjes CA, Hemberger P, Blanksby SJ, da Silva G, Trevitt AJ. Product detection study of the gas-phase oxidation of methylphenyl radicals using synchrotron photoionisation mass spectrometry. Phys Chem Chem Phys 2019; 21:17939-17949. [DOI: 10.1039/c9cp01935a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactions of ortho and meta-methylphenyl radicals with oxygen form products that depend acutely on the position of the methyl group.
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Affiliation(s)
| | | | - John D. Savee
- Combustion Research Facility
- Sandia National Laboratories
- Livermore
- USA
| | - David L. Osborn
- Combustion Research Facility
- Sandia National Laboratories
- Livermore
- USA
| | - Craig A. Taatjes
- Combustion Research Facility
- Sandia National Laboratories
- Livermore
- USA
| | - Patrick Hemberger
- Laboratory for Femtochemistry and Synchrotron Radiation
- Paul Scherrer Institut
- CH-5232 Villigen PSI
- Switzerland
| | - Stephen J. Blanksby
- Central Analytical Research Facility
- Queensland University of Technology
- Brisbane QLD 4001
- Australia
| | - Gabriel da Silva
- Department of Chemical Engineering
- The University of Melbourne
- Melbourne
- Australia
| | - Adam J. Trevitt
- School of Chemistry
- University of Wollongong
- Wollongong
- Australia
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Chhantyal-Pun R, Shannon RJ, Tew DP, Caravan RL, Duchi M, Wong C, Ingham A, Feldman C, McGillen MR, Khan MAH, Antonov IO, Rotavera B, Ramasesha K, Osborn DL, Taatjes CA, Percival CJ, Shallcross DE, Orr-Ewing AJ. Experimental and computational studies of Criegee intermediate reactions with NH3 and CH3NH2. Phys Chem Chem Phys 2019; 21:14042-14052. [DOI: 10.1039/c8cp06810k] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The significance of removal of atmospheric ammonia and amines by reaction with Criegee intermediates is assessed by kinetic studies.
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Caravan RL, Khan MAH, Zádor J, Sheps L, Antonov IO, Rotavera B, Ramasesha K, Au K, Chen MW, Rösch D, Osborn DL, Fittschen C, Schoemaecker C, Duncianu M, Grira A, Dusanter S, Tomas A, Percival CJ, Shallcross DE, Taatjes CA. The reaction of hydroxyl and methylperoxy radicals is not a major source of atmospheric methanol. Nat Commun 2018; 9:4343. [PMID: 30341291 PMCID: PMC6195545 DOI: 10.1038/s41467-018-06716-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 08/05/2018] [Indexed: 11/18/2022] Open
Abstract
Methanol is a benchmark for understanding tropospheric oxidation, but is underpredicted by up to 100% in atmospheric models. Recent work has suggested this discrepancy can be reconciled by the rapid reaction of hydroxyl and methylperoxy radicals with a methanol branching fraction of 30%. However, for fractions below 15%, methanol underprediction is exacerbated. Theoretical investigations of this reaction are challenging because of intersystem crossing between singlet and triplet surfaces - ∼45% of reaction products are obtained via intersystem crossing of a pre-product complex - which demands experimental determinations of product branching. Here we report direct measurements of methanol from this reaction. A branching fraction below 15% is established, consequently highlighting a large gap in the understanding of global methanol sources. These results support the recent high-level theoretical work and substantially reduce its uncertainties.
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Affiliation(s)
- Rebecca L Caravan
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA.
| | - M Anwar H Khan
- School of Chemistry, Cantock's Close, University of Bristol, Bristol, BS8 1TS, UK
| | - Judit Zádor
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Leonid Sheps
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Ivan O Antonov
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Brandon Rotavera
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Krupa Ramasesha
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Kendrew Au
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Ming-Wei Chen
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Daniel Rösch
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - David L Osborn
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA
| | - Christa Fittschen
- Université Lille, CNRS, UMR 8522-PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, 59000, Lille, France
| | - Coralie Schoemaecker
- Université Lille, CNRS, UMR 8522-PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, 59000, Lille, France
| | - Marius Duncianu
- IMT Lille Douai, Université Lille, Département Sciences de l'Atmosphère et Génie de l'Environnement (SAGE), 59000, Lille, France
| | - Asma Grira
- IMT Lille Douai, Université Lille, Département Sciences de l'Atmosphère et Génie de l'Environnement (SAGE), 59000, Lille, France
| | - Sebastien Dusanter
- IMT Lille Douai, Université Lille, Département Sciences de l'Atmosphère et Génie de l'Environnement (SAGE), 59000, Lille, France
| | - Alexandre Tomas
- IMT Lille Douai, Université Lille, Département Sciences de l'Atmosphère et Génie de l'Environnement (SAGE), 59000, Lille, France
| | - Carl J Percival
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA
| | - Dudley E Shallcross
- School of Chemistry, Cantock's Close, University of Bristol, Bristol, BS8 1TS, UK.
| | - Craig A Taatjes
- Combustion Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, CA, 94551, USA.
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Eskola AJ, Döntgen M, Rotavera B, Caravan RL, Welz O, Savee JD, Osborn DL, Shallcross DE, Percival CJ, Taatjes CA. Direct kinetics study of CH 2OO + methyl vinyl ketone and CH 2OO + methacrolein reactions and an upper limit determination for CH 2OO + CO reaction. Phys Chem Chem Phys 2018; 20:19373-19381. [PMID: 29999060 DOI: 10.1039/c8cp03606c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Methyl vinyl ketone (MVK) and methacrolein (MACR) are important intermediate products in atmospheric degradation of volatile organic compounds, especially of isoprene. This work investigates the reactions of the smallest Criegee intermediate, CH2OO, with its co-products from isoprene ozonolysis, MVK and MACR, using multiplexed photoionization mass spectrometry (MPIMS), with either tunable synchrotron radiation from the Advanced Light Source or Lyman-α (10.2 eV) radiation for photoionization. CH2OO was produced via pulsed laser photolysis of CH2I2 in the presence of excess O2. Time-resolved measurements of reactant disappearance and of product formation were performed to monitor reaction progress; first order rate coefficients were obtained from exponential fits to the CH2OO decays. The bimolecular reaction rate coefficients at 300 K and 4 Torr are k(CH2OO + MVK) = (5.0 ± 0.4) × 10-13 cm3 s-1 and k(CH2OO + MACR) = (4.4 ± 1.0) × 10-13 cm3 s-1, where the stated ±2σ uncertainties are statistical uncertainties. Adduct formation is observed for both reactions and is attributed to the formation of a secondary ozonides (1,2,4-trioxolanes), supported by master equation calculations of the kinetics and the agreement between measured and calculated adiabatic ionization energies. Kinetics measurements were also performed for a possible bimolecular CH2OO + CO reaction and for the reaction of CH2OO with CF3CHCH2 at 300 K and 4 Torr. For CH2OO + CO, no reaction is observed and an upper limit is determined: k(CH2OO + CO) < 2 × 10-16 cm3 s-1. For CH2OO + CF3CHCH2, an upper limit of k(CH2OO + CF3CHCH2) < 2 × 10-14 cm3 s-1 is obtained.
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Affiliation(s)
- Arkke J Eskola
- Combustion Research Facility, Sandia National Laboratories, 7011 East Avenue, MS 9055, Livermore, California 94551, USA.
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30
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Dodson LG, Savee JD, Gozem S, Shen L, Krylov AI, Taatjes CA, Osborn DL, Okumura M. Vacuum ultraviolet photoionization cross section of the hydroxyl radical. J Chem Phys 2018; 148:184302. [DOI: 10.1063/1.5024249] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Leah G. Dodson
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
| | - John D. Savee
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, USA
| | - Samer Gozem
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA
| | - Linhan Shen
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
| | - Anna I. Krylov
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA
| | - Craig A. Taatjes
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, USA
| | - David L. Osborn
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, USA
| | - Mitchio Okumura
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
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31
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Chen MW, Rotavera B, Chao W, Zádor J, Taatjes CA. Direct measurement of ˙OH and HO 2˙ formation in ˙R + O 2 reactions of cyclohexane and tetrahydropyran. Phys Chem Chem Phys 2018; 20:10815-10825. [PMID: 29417107 DOI: 10.1039/c7cp08164b] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Formation of the key general radical chain carriers, ˙OH and HO2˙, during pulsed-photolytic ˙Cl-initiated oxidation of tetrahydropyran and cyclohexane are measured with time-resolved infrared absorption in a temperature-controlled Herriott multipass cell in the temperature range of 500-750 K at 20 Torr. The experiments show two distinct timescales for HO2˙ and ˙OH formation in the oxidation of both fuels. Analysis of the timescales reveals striking differences in behavior between the two fuels. In both cyclohexane and tetrahydropyran oxidation, a faster timescale is strongly related to the "well-skipping" (˙R + O2 → alkene + HO2˙ or cyclic ether + ˙OH) mechanism and is expected to have, at most, a weak temperature dependence. Indeed, the fast HO2˙ formation timescale is nearly temperature independent both for cyclohexyl + O2 and for tetrahydropyranyl + O2 below 700 K. A slower HO2˙ formation timescale in cyclohexane oxidation is shown to be linked to the sequential ˙R + O2 → ROO˙ → alkene + HO2˙ pathway, and displays a strong temperature dependence mainly from the final step (with energy barrier ∼32.5 kcal mol-1). In contrast, the slower HO2˙ formation timescale in tetrahydropyran oxidation is surprisingly temperature insensitive across all measured temperatures. Although the ˙OH formation timescales in tetrahydropyran oxidation show a temperature dependence similar to the cyclohexane oxidation, the temperature dependence of ˙OH yield is opposite in both cases. This significant difference of HO2˙ formation kinetics and ˙OH formation yield for the tetrahydropyran oxidation can arise from contributions related to ring-opening pathways in the tetrahydropyranyl + O2 system that compete with the typical ˙R + O2 reaction scheme. This comparison of two similar fuels demonstrates the consequences of differing chemical mechanisms on ˙OH and HO2˙ formation and shows that they can be highlighted by analysis of the eigenvalues of a system of simplified kinetic equations for the alkylperoxy-centered ˙R + O2 reaction pathways. We suggest that such analysis can be more generally applied to complex or poorly known oxidation systems.
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Affiliation(s)
- Ming-Wei Chen
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94550, USA.
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Khan MAH, Percival CJ, Caravan RL, Taatjes CA, Shallcross DE. Criegee intermediates and their impacts on the troposphere. Environ Sci Process Impacts 2018; 20:437-453. [PMID: 29480909 DOI: 10.1039/c7em00585g] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Criegee intermediates (CIs), carbonyl oxides formed in ozonolysis of alkenes, play key roles in the troposphere. The decomposition of CIs can be a significant source of OH to the tropospheric oxidation cycle especially during nighttime and winter months. A variety of model-measurement studies have estimated surface-level stabilized Criegee intermediate (sCI) concentrations on the order of 1 × 104 cm-3 to 1 × 105 cm-3, which makes a non-negligible contribution to the oxidising capacity in the terrestrial boundary layer. The reactions of sCI with the water monomer and the water dimer have been found to be the most important bimolecular reactions to the tropospheric sCI loss rate, at least for the smallest carbonyl oxides; the products from these reactions (e.g. hydroxymethyl hydroperoxide, HMHP) are also of importance to the atmospheric oxidation cycle. The sCI can oxidise SO2 to form SO3, which can go on to form a significant amount of H2SO4 which is a key atmospheric nucleation species and therefore vital to the formation of clouds. The sCI can also react with carboxylic acids, carbonyl compounds, alcohols, peroxy radicals and hydroperoxides, and the products of these reactions are likely to be highly oxygenated species, with low vapour pressures, that can lead to nucleation and SOA formation over terrestrial regions.
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Affiliation(s)
- M A H Khan
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
| | - C J Percival
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr, Pasadena, CA 91109, USA
| | - R L Caravan
- Combustion Research Facility, Sandia National Laboratories, Mailstop 9055, Livermore, California, 94551 USA
| | - C A Taatjes
- Combustion Research Facility, Sandia National Laboratories, Mailstop 9055, Livermore, California, 94551 USA
| | - D E Shallcross
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
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Sheps L, Rotavera B, Eskola AJ, Osborn DL, Taatjes CA, Au K, Shallcross DE, Khan MAH, Percival CJ. The reaction of Criegee intermediate CH 2OO with water dimer: primary products and atmospheric impact. Phys Chem Chem Phys 2018; 19:21970-21979. [PMID: 28805226 DOI: 10.1039/c7cp03265j] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The rapid reaction of the smallest Criegee intermediate, CH2OO, with water dimers is the dominant removal mechanism for CH2OO in the Earth's atmosphere, but its products are not well understood. This reaction was recently suggested as a significant source of the most abundant tropospheric organic acid, formic acid (HCOOH), which is consistently underpredicted by atmospheric models. However, using time-resolved measurements of reaction kinetics by UV absorption and product analysis by photoionization mass spectrometry, we show that the primary products of this reaction are formaldehyde and hydroxymethyl hydroperoxide (HMHP), with direct HCOOH yields of less than 10%. Incorporating our results into a global chemistry-transport model further reduces HCOOH levels by 10-90%, relative to previous modeling assumptions, which indicates that the reaction CH2OO + water dimer by itself cannot resolve the discrepancy between the measured and predicted HCOOH levels.
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Affiliation(s)
- Leonid Sheps
- Combustion Research Facility, Sandia National Laboratories, 7011 East Ave., MS 9055, Livermore, California 94551, USA.
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Czekner J, Taatjes CA, Osborn DL, Meloni G. Study of low temperature chlorine atom initiated oxidation of methyl and ethyl butyrate using synchrotron photoionization TOF-mass spectrometry. Phys Chem Chem Phys 2018; 20:5785-5794. [DOI: 10.1039/c7cp08221e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The initial oxidation products of methyl butyrate (MB) and ethyl butyrate (EB) are studied using a time- and energy-resolved photoionization mass spectrometer.
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Affiliation(s)
- Joseph Czekner
- University of San Francisco, Department of Chemistry
- San Francisco
- USA
| | - Craig A. Taatjes
- Combustion Research Facility, Sandia National Laboratories
- Livermore
- USA
| | - David L. Osborn
- Combustion Research Facility, Sandia National Laboratories
- Livermore
- USA
| | - Giovanni Meloni
- University of San Francisco, Department of Chemistry
- San Francisco
- USA
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Eskola AJ, Antonov IO, Sheps L, Savee JD, Osborn DL, Taatjes CA. Time-resolved measurements of product formation in the low-temperature (550-675 K) oxidation of neopentane: a probe to investigate chain-branching mechanism. Phys Chem Chem Phys 2017; 19:13731-13745. [PMID: 28503692 DOI: 10.1039/c7cp01366c] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Product formation, in particular ketohydroperoxide formation and decomposition, were investigated in time-resolved, Cl-atom initiated neopentane oxidation experiments in the temperature range 550-675 K using a photoionization time-of-flight mass spectrometer. Ionization light was provided either by Advanced Light Source tunable synchrotron radiation or ∼10.2 eV fixed energy radiation from a H2-discharge lamp. Experiments were performed both at 1-2 atm pressure using a high-pressure reactor and also at ∼9 Torr pressure employing a low-pressure reactor for comparison. Because of the highly symmetric structure of neopentane, ketohydroperoxide signal can be attributed to a 3-hydroperoxy-2,2-dimethylpropanal isomer, i.e. from a γ-ketohydroperoxide (γ-KHP). The photoionization spectra of the γ-KHP measured at low- and high pressures and varying oxygen concentrations agree well with each other, further supporting they originate from the single isomer. Measurements performed in this work also suggest that the "Korcek" mechanism may play an important role in the decomposition of 3-hydroperoxy-2,2-dimethylpropanal, especially at lower temperatures. However, at higher temperatures where γ-KHP decomposition to hydroxyl radical and oxy-radical dominates, oxidation of the oxy-radical yields a new important channel leading to acetone, carbon monoxide, and OH radical. Starting from the initial neopentyl + O2 reaction, this channel releases altogether three OH radicals. A strongly temperature-dependent reaction product is observed at m/z = 100, likely attributable to 2,2-dimethylpropanedial.
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Affiliation(s)
- Arkke J Eskola
- Combustion Research Facility, Sandia National Laboratories, 7011 East Avenue, MS 9055, Livermore, California 94551, USA.
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36
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Affiliation(s)
- Craig A. Taatjes
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551-0969
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37
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Caravan RL, Khan MAH, Rotavera B, Papajak E, Antonov IO, Chen MW, Au K, Chao W, Osborn DL, Lin JJM, Percival CJ, Shallcross DE, Taatjes CA. Products of Criegee intermediate reactions with NO2: experimental measurements and tropospheric implications. Faraday Discuss 2017; 200:313-330. [DOI: 10.1039/c7fd00007c] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactions of Criegee intermediates with NO2 have been proposed as a potentially significant source of the important nighttime oxidant NO3, particularly in urban environments where concentrations of ozone, alkenes and NOx are high. However, previous efforts to characterize the yield of NO3 from these reactions have been inconclusive, with many studies failing to detect NO3. In the present work, the reactions of formaldehyde oxide (CH2OO) and acetaldehyde oxide (CH3CHOO) with NO2 are revisited to further explore the product formation over a pressure range of 4–40 Torr. NO3 is not observed; however, temporally resolved and [NO2]-dependent signal is observed at the mass of the Criegee–NO2 adduct for both formaldehyde- and acetaldehyde-oxide systems, and the structure of this adduct is explored through ab initio calculations. The atmospheric implications of the title reaction are investigated through global modelling.
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38
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Taatjes CA, Liu F, Rotavera B, Kumar M, Caravan R, Osborn DL, Thompson WH, Lester MI. Hydroxyacetone Production From C3 Criegee Intermediates. J Phys Chem A 2016; 121:16-23. [DOI: 10.1021/acs.jpca.6b07712] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Craig A. Taatjes
- Combustion Research
Facility, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - Fang Liu
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Brandon Rotavera
- Combustion Research
Facility, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - Manoj Kumar
- Department of Chemistry, University of Nebraska—Lincoln, Lincoln, Nebraska 68588-0304, United States
| | - Rebecca Caravan
- Combustion Research
Facility, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - David L. Osborn
- Combustion Research
Facility, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - Ward H. Thompson
- Department
of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
| | - Marsha I. Lester
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
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39
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Chhantyal-Pun R, Welz O, Savee JD, Eskola AJ, Lee EPF, Blacker L, Hill HR, Ashcroft M, Khan MAH, Lloyd-Jones GC, Evans L, Rotavera B, Huang H, Osborn DL, Mok DKW, Dyke JM, Shallcross DE, Percival CJ, Orr-Ewing AJ, Taatjes CA. Direct Measurements of Unimolecular and Bimolecular Reaction Kinetics of the Criegee Intermediate (CH3)2COO. J Phys Chem A 2016; 121:4-15. [DOI: 10.1021/acs.jpca.6b07810] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rabi Chhantyal-Pun
- School of Chemistry, The University of Bristol, Cantock’s
Close BS8 1TS, U.K
| | - Oliver Welz
- Combustion Research Facility, Mail Stop
9055, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - John D. Savee
- Combustion Research Facility, Mail Stop
9055, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - Arkke J. Eskola
- Combustion Research Facility, Mail Stop
9055, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - Edmond P. F. Lee
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, U.K
- Department
of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | - Lucy Blacker
- School of Chemistry, The University of Bristol, Cantock’s
Close BS8 1TS, U.K
| | - Henry R. Hill
- School of Chemistry, The University of Bristol, Cantock’s
Close BS8 1TS, U.K
| | - Matilda Ashcroft
- School of Chemistry, The University of Bristol, Cantock’s
Close BS8 1TS, U.K
| | - M. Anwar H. Khan
- School of Chemistry, The University of Bristol, Cantock’s
Close BS8 1TS, U.K
| | - Guy C. Lloyd-Jones
- School of Chemistry, The University of Bristol, Cantock’s
Close BS8 1TS, U.K
| | - Louise Evans
- School of Chemistry, The University of Bristol, Cantock’s
Close BS8 1TS, U.K
| | - Brandon Rotavera
- Combustion Research Facility, Mail Stop
9055, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - Haifeng Huang
- Combustion Research Facility, Mail Stop
9055, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - David L. Osborn
- Combustion Research Facility, Mail Stop
9055, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - Daniel K. W. Mok
- The Centre
for Atmospheric Science, The School of Earth, Atmospheric and Environmental
Science, The University of Manchester, Simon Building, Brunswick Street, Manchester M13 9PL, U.K
| | - John M. Dyke
- Department
of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | | | - Carl J. Percival
- The Centre
for Atmospheric Science, The School of Earth, Atmospheric and Environmental
Science, The University of Manchester, Simon Building, Brunswick Street, Manchester M13 9PL, U.K
| | - Andrew J. Orr-Ewing
- School of Chemistry, The University of Bristol, Cantock’s
Close BS8 1TS, U.K
| | - Craig A. Taatjes
- Combustion Research Facility, Mail Stop
9055, Sandia National Laboratories, Livermore, California 94551-0969, United States
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40
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Scheer AM, Eskola AJ, Osborn DL, Sheps L, Taatjes CA. Resonance Stabilization Effects on Ketone Autoxidation: Isomer-Specific Cyclic Ether and Ketohydroperoxide Formation in the Low-Temperature (400–625 K) Oxidation of Diethyl Ketone. J Phys Chem A 2016; 120:8625-8636. [DOI: 10.1021/acs.jpca.6b07370] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Adam M. Scheer
- Combustion Research Facility, Sandia National Laboratories, MS 9055, Livermore, California 94551, United States
| | - Arkke J. Eskola
- Combustion Research Facility, Sandia National Laboratories, MS 9055, Livermore, California 94551, United States
| | - David L. Osborn
- Combustion Research Facility, Sandia National Laboratories, MS 9055, Livermore, California 94551, United States
| | - Leonid Sheps
- Combustion Research Facility, Sandia National Laboratories, MS 9055, Livermore, California 94551, United States
| | - Craig A. Taatjes
- Combustion Research Facility, Sandia National Laboratories, MS 9055, Livermore, California 94551, United States
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41
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Moshammer K, Jasper AW, Popolan-Vaida DM, Wang Z, Bhavani Shankar VS, Ruwe L, Taatjes CA, Dagaut P, Hansen N. Quantification of the Keto-Hydroperoxide (HOOCH2OCHO) and Other Elusive Intermediates during Low-Temperature Oxidation of Dimethyl Ether. J Phys Chem A 2016; 120:7890-7901. [DOI: 10.1021/acs.jpca.6b06634] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kai Moshammer
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Ahren W. Jasper
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Denisia M. Popolan-Vaida
- Department
of
Chemistry, University of California—Berkeley, and Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Zhandong Wang
- King
Abdullah University of Science and Technology (KAUST), Clean Combustion Research Center (CCRC), Thuwal 23955-6900, Saudi Arabia
| | - Vijai Shankar Bhavani Shankar
- King
Abdullah University of Science and Technology (KAUST), Clean Combustion Research Center (CCRC), Thuwal 23955-6900, Saudi Arabia
| | - Lena Ruwe
- Department
of Chemistry, Bielefeld University, D-33615 Bielefeld, Germany
| | - Craig A. Taatjes
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Philippe Dagaut
- Centre National
de la Recherche Scientifique (CNRS-INSIS), ICARE, 45071 Orléans Cedex 2, France
| | - Nils Hansen
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
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42
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Antonov IO, Zádor J, Rotavera B, Papajak E, Osborn DL, Taatjes CA, Sheps L. Pressure-Dependent Competition among Reaction Pathways from First- and Second-O2 Additions in the Low-Temperature Oxidation of Tetrahydrofuran. J Phys Chem A 2016; 120:6582-95. [DOI: 10.1021/acs.jpca.6b05411] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ivan O. Antonov
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Judit Zádor
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Brandon Rotavera
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Ewa Papajak
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - David L. Osborn
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Craig A. Taatjes
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Leonid Sheps
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
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43
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Muller G, Scheer A, Osborn DL, Taatjes CA, Meloni G. Low Temperature Chlorine-Initiated Oxidation of Small-Chain Methyl Esters: Quantification of Chain-Terminating HO2-Elimination Channels. J Phys Chem A 2016; 120:1677-90. [DOI: 10.1021/acs.jpca.6b00148] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Giel Muller
- University of San Francisco, San Francisco, California 94117, United States
| | - Adam Scheer
- Pacific Gas and Electric Company, 245 Market Street, San Francisco, California 94111, United States
| | - David L. Osborn
- Sandia National Laboratories, Livermore, California 94551, United States
| | - Craig A. Taatjes
- Sandia National Laboratories, Livermore, California 94551, United States
| | - Giovanni Meloni
- University of San Francisco, San Francisco, California 94117, United States
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44
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Wu W, Tran W, Taatjes CA, Alonso-Gutierrez J, Lee TS, Gladden JM. Rapid Discovery and Functional Characterization of Terpene Synthases from Four Endophytic Xylariaceae. PLoS One 2016; 11:e0146983. [PMID: 26885833 PMCID: PMC4757406 DOI: 10.1371/journal.pone.0146983] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 12/23/2015] [Indexed: 01/20/2023] Open
Abstract
Endophytic fungi are ubiquitous plant endosymbionts that establish complex and poorly understood relationships with their host organisms. Many endophytic fungi are known to produce a wide spectrum of volatile organic compounds (VOCs) with potential energy applications, which have been described as "mycodiesel". Many of these mycodiesel hydrocarbons are terpenes, a chemically diverse class of compounds produced by many plants, fungi, and bacteria. Due to their high energy densities, terpenes, such as pinene and bisabolene, are actively being investigated as potential "drop-in" biofuels for replacing diesel and aviation fuel. In this study, we rapidly discovered and characterized 26 terpene synthases (TPSs) derived from four endophytic fungi known to produce mycodiesel hydrocarbons. The TPS genes were expressed in an E. coli strain harboring a heterologous mevalonate pathway designed to enhance terpene production, and their product profiles were determined using Solid Phase Micro-Extraction (SPME) and GC-MS. Out of the 26 TPS's profiled, 12 TPS's were functional, with the majority of them exhibiting both monoterpene and sesquiterpene synthase activity.
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Affiliation(s)
- Weihua Wu
- Biomass Science & Conversion Technologies, Sandia National Laboratories, Livermore, California, United States of America
| | - William Tran
- Biomass Science & Conversion Technologies, Sandia National Laboratories, Livermore, California, United States of America
| | - Craig A. Taatjes
- Combustion Chemistry Department, Sandia National Laboratories, Livermore, California, United States of America
| | - Jorge Alonso-Gutierrez
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
- Joint BioEnergy Institute, Emeryville, California, United States of America
| | - Taek Soon Lee
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
- Joint BioEnergy Institute, Emeryville, California, United States of America
| | - John M. Gladden
- Biomass Science & Conversion Technologies, Sandia National Laboratories, Livermore, California, United States of America
- Joint BioEnergy Institute, Emeryville, California, United States of America
- * E-mail: ;
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45
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Prendergast MB, Kirk BB, Savee JD, Osborn DL, Taatjes CA, Masters KS, Blanksby SJ, da Silva G, Trevitt AJ. Formation and stability of gas-phase o-benzoquinone from oxidation of ortho-hydroxyphenyl: a combined neutral and distonic radical study. Phys Chem Chem Phys 2016; 18:4320-32. [DOI: 10.1039/c5cp02953h] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The o-hydroxyphenyl radical reacts with O2 to form o-benzoquinone + OH and cyclopentadienone is assigned as a secondary product.
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Affiliation(s)
| | | | - John D. Savee
- Combustion Research Facility
- Sandia National Laboratories
- Livermore
- USA
| | - David L. Osborn
- Combustion Research Facility
- Sandia National Laboratories
- Livermore
- USA
| | - Craig A. Taatjes
- Combustion Research Facility
- Sandia National Laboratories
- Livermore
- USA
| | - Kye-Simeon Masters
- School of Chemistry, Physics and Mechanical Engineering
- Faculty of Science and Engineering
- Queensland University of Technology
- Brisbane
- Australia
| | - Stephen J. Blanksby
- Central Analytical Research Facility
- Queensland University of Technology
- Brisbane
- Australia
| | - Gabriel da Silva
- Department of Chemical and Biomolecular Engineering
- The University of Melbourne
- Melbourne
- Australia
| | - Adam J. Trevitt
- School of Chemistry
- University of Wollongong
- Wollongong
- Australia
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46
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Savee JD, Selby TM, Welz O, Taatjes CA, Osborn DL. Time- and Isomer-Resolved Measurements of Sequential Addition of Acetylene to the Propargyl Radical. J Phys Chem Lett 2015; 6:4153-4158. [PMID: 26722791 DOI: 10.1021/acs.jpclett.5b01896] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Soot formation in combustion is a complex process in which polycyclic aromatic hydrocarbons (PAHs) are believed to play a critical role. Recent works concluded that three consecutive additions of acetylene (C2H2) to propargyl (C3H3) create a facile route to the PAH indene (C9H8). However, the isomeric forms of C5H5 and C7H7 intermediates in this reaction sequence are not known. We directly investigate these intermediates using time- and isomer-resolved experiments. Both the resonance stabilized vinylpropargyl (vp-C5H5) and 2,4-cyclopentadienyl (c-C5H5) radical isomers of C5H5 are produced, with substantially different intensities at 800 K vs 1000 K. In agreement with literature master equation calculations, we find that c-C5H5 + C2H2 produces only the tropyl isomer of C7H7 (tp-C7H7) below 1000 K, and that tp-C7H7 + C2H2 terminates the reaction sequence yielding C9H8 (indene) + H. This work demonstrates a pathway for PAH formation that does not proceed through benzene.
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Affiliation(s)
- John D Savee
- Combustion Research Facility, Sandia National Laboratories , Mail Stop 9055, Livermore, California 94551-0969, United States
| | - Talitha M Selby
- Combustion Research Facility, Sandia National Laboratories , Mail Stop 9055, Livermore, California 94551-0969, United States
| | - Oliver Welz
- Combustion Research Facility, Sandia National Laboratories , Mail Stop 9055, Livermore, California 94551-0969, United States
| | - Craig A Taatjes
- Combustion Research Facility, Sandia National Laboratories , Mail Stop 9055, Livermore, California 94551-0969, United States
| | - David L Osborn
- Combustion Research Facility, Sandia National Laboratories , Mail Stop 9055, Livermore, California 94551-0969, United States
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47
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48
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Burke MP, Goldsmith CF, Klippenstein SJ, Welz O, Huang H, Antonov IO, Savee JD, Osborn DL, Zádor J, Taatjes CA, Sheps L. Multiscale Informatics for Low-Temperature Propane Oxidation: Further Complexities in Studies of Complex Reactions. J Phys Chem A 2015; 119:7095-115. [DOI: 10.1021/acs.jpca.5b01003] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael P. Burke
- Department of Mechanical Engineering, Department
of Chemical Engineering, and Data Sciences Institute, Columbia University, New York, New York, United States
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois, United States
| | - C. Franklin Goldsmith
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois, United States
- School of Engineering, Brown University, Providence, Rhode Island, United States
| | - Stephen J. Klippenstein
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois, United States
| | - Oliver Welz
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
| | - Haifeng Huang
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
| | - Ivan O. Antonov
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
| | - John D. Savee
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
| | - David L. Osborn
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
| | - Judit Zádor
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
| | - Craig A. Taatjes
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
| | - Leonid Sheps
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
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49
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Savee JD, Borkar S, Welz O, Sztáray B, Taatjes CA, Osborn DL. Multiplexed Photoionization Mass Spectrometry Investigation of the O(3P) + Propyne Reaction. J Phys Chem A 2015; 119:7388-403. [DOI: 10.1021/acs.jpca.5b00491] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John D. Savee
- Combustion
Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - Sampada Borkar
- Department
of Chemistry, University of the Pacific, Stockton, California 95211, United States
| | - Oliver Welz
- Combustion
Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - Bálint Sztáray
- Department
of Chemistry, University of the Pacific, Stockton, California 95211, United States
| | - Craig A. Taatjes
- Combustion
Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
| | - David L. Osborn
- Combustion
Research Facility, Sandia National Laboratories, Mail Stop 9055, Livermore, California 94551-0969, United States
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50
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Scheer AM, Welz O, Vasu SS, Osborn DL, Taatjes CA. Low temperature (550-700 K) oxidation pathways of cyclic ketones: dominance of HO2-elimination channels yielding conjugated cyclic coproducts. Phys Chem Chem Phys 2015; 17:12124-34. [PMID: 25877515 DOI: 10.1039/c4cp06097k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The low-temperature oxidation of three cyclic ketones, cyclopentanone (CPO; C5H8=O), cyclohexanone (CHO; C6H10=O), and 2-methyl-cyclopentanone (2-Me-CPO; CH3-C5H7=O), is studied between 550 and 700 K and at 4 or 8 Torr total pressure. Initial fuel radicals R are formed via fast H-abstraction from the ketones by laser-photolytically generated chlorine atoms. Intermediates and products from the subsequent reactions of these radicals in the presence of excess O2 are probed with time and isomeric resolution using multiplexed photoionization mass spectrometry with tunable synchrotron ionizing radiation. For CPO and CHO the dominant product channel in the R + O2 reactions is chain-terminating HO2-elimination yielding the conjugated cyclic coproducts 2-cyclopentenone and 2-cyclohexenone, respectively. Results on oxidation of 2-Me-CPO also show a dominant contribution from HO2-elimination. The photoionization spectrum of the co-product suggests formation of 2-methyl-2-cyclopentenone and/or 2-cyclohexenone, resulting from a rapid Dowd-Beckwith rearrangement, preceding addition to O2, of the initial (2-oxocyclopentyl)methyl radical to 3-oxocyclohexyl. Cyclic ethers, markers for hydroperoxyalkyl radicals (QOOH), key intermediates in chain-propagating and chain-branching low-temperature combustion pathways, are only minor products. The interpretation of the experimental results is supported by stationary point calculations on the potential energy surfaces of the associated R + O2 reactions at the CBS-QB3 level. The calculations indicate that HO2-elimination channels are energetically favored and product formation via QOOH is disfavored. The prominence of chain-terminating pathways linked with HO2 formation in low-temperature oxidation of cyclic ketones suggests little low-temperature reactivity of these species as fuels in internal combustion engines.
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Affiliation(s)
- Adam M Scheer
- Combustion Research Facility, Sandia National Laboratories, MS 9055, Livermore, CA 94551, USA.
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