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Tranter RS, Lynch PT, Randazzo JB, Lockhart JPA, Chen X, Goldsmith CF. High temperature pyrolysis of 2-methyl furan. Phys Chem Chem Phys 2018; 20:10826-10837. [DOI: 10.1039/c7cp07775k] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Experiments and theory reveal the complex dissociation of 2-methylfuran and the surprising importance of H-atom loss.
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Affiliation(s)
- R. S. Tranter
- Chemical Sciences and Engineering Division
- Argonne National Laboratory
- Argonne
- USA
| | - P. T. Lynch
- Chemical Sciences and Engineering Division
- Argonne National Laboratory
- Argonne
- USA
| | - J. B. Randazzo
- Chemical Sciences and Engineering Division
- Argonne National Laboratory
- Argonne
- USA
| | - J. P. A. Lockhart
- Chemical Sciences and Engineering Division
- Argonne National Laboratory
- Argonne
- USA
| | - X. Chen
- Department of Chemistry
- Brown University
- Providence
- USA
| | - C. F. Goldsmith
- Chemical Sciences and Engineering Division
- Argonne National Laboratory
- Argonne
- USA
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Lockhart JPA, Goldsmith CF, Randazzo JB, Ruscic B, Tranter RS. An Experimental and Theoretical Study of the Thermal Decomposition of C4H6 Isomers. J Phys Chem A 2017; 121:3827-3850. [PMID: 28440652 DOI: 10.1021/acs.jpca.7b01186] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James P. A. Lockhart
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois, United States
| | | | - John B. Randazzo
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois, United States
| | - Branko Ruscic
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois, United States
- Computation
Institute, The University of Chicago, Chicago, Illinois, United States
| | - Robert S. Tranter
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois, United States
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3
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Yang F, Deng F, Pan Y, Tian Z, Zhang Y, Huang Z. Ab initio kinetics for isomerization reaction of normal-chain hexadiene isomers. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.09.038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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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] [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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Fridlyand A, Goldsborough SS, Brezinsky K. Chemical Kinetic Influences of Alkyl Chain Structure on the High Pressure and Temperature Oxidation of a Representative Unsaturated Biodiesel: Methyl Nonenoate. J Phys Chem A 2015; 119:7559-77. [PMID: 25710595 DOI: 10.1021/acs.jpca.5b00914] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The high pressure and temperature oxidation of methyl trans-2-nonenoate, methyl trans-3-nonenoate, 1-octene, and trans-2-octene are investigated experimentally to probe the influence of the double bond position on the chemical kinetics of long esters and alkenes. Single pulse shock tube experiments are performed in the ranges p = 3.8-6.2 MPa and T = 850-1500 K, with an average reaction time of 2 ms. Gas chromatographic measurements indicate increased reactivity for trans-2-octene compared to 1-octene, whereas both methyl nonenoate isomers have reactivities similar to that of 1-octene. A difference in the yield of stable intermediates is observed for the octenes when compared to the methyl nonenoates. Chemical kinetic models are developed with the aid of the Reaction Mechanism Generator to interpret the experimental results. The models are created using two different base chemistry submodels to investigate the influence of the foundational chemistry (i.e., C0-C4), whereas Monte Carlo simulations are performed to examine the quality of agreement with the experimental results. Significant uncertainties are found in the chemistry of unsaturated esters with the double bonds located close to the ester groups. This work highlights the importance of the foundational chemistry in predictive chemical kinetics of biodiesel combustion at engine relevant conditions.
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Affiliation(s)
- Aleksandr Fridlyand
- †Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 W. Taylor Street, Chicago, Illinois 60607, United States.,‡Energy Systems Division, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, United States
| | - S Scott Goldsborough
- †Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 W. Taylor Street, Chicago, Illinois 60607, United States.,‡Energy Systems Division, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, United States
| | - Kenneth Brezinsky
- †Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 W. Taylor Street, Chicago, Illinois 60607, United States
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Seidel L, Hoyermann K, Mauß F, Nothdurft J, Zeuch T. Pressure dependent product formation in the photochemically initiated allyl + allyl reaction. Molecules 2013; 18:13608-22. [PMID: 24192913 PMCID: PMC6270213 DOI: 10.3390/molecules181113608] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Revised: 10/17/2013] [Accepted: 10/22/2013] [Indexed: 11/16/2022] Open
Abstract
Photochemically driven reactions involving unsaturated radicals produce a thick global layer of organic haze on Titan, Saturn's largest moon. The allyl radical self-reaction is an example for this type of chemistry and was examined at room temperature from an experimental and kinetic modelling perspective. The experiments were performed in a static reactor with a volume of 5 L under wall free conditions. The allyl radicals were produced from laser flash photolysis of three different precursors allyl bromide (C3H5Br), allyl chloride (C3H5Cl), and 1,5-hexadiene (CH2CH(CH2)2CHCH2) at 193 nm. Stable products were identified by their characteristic vibrational modes and quantified using FTIR spectroscopy. In addition to the (re-) combination pathway C3H5+C3H5 → C6H10 we found at low pressures around 1 mbar the highest final product yields for allene and propene for the precursor C3H5Br. A kinetic analysis indicates that the end product formation is influenced by specific reaction kinetics of photochemically activated allyl radicals. Above 10 mbar the (re-) combination pathway becomes dominant. These findings exemplify the specificities of reaction kinetics involving chemically activated species, which for certain conditions cannot be simply deduced from combustion kinetics or atmospheric chemistry on Earth.
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Affiliation(s)
- Lars Seidel
- Lehrstuhl Thermodynamik/Thermische Verfahrenstechnik, BrandenburgischeTechnische-Universität, Siemens-Halske-Ring 8, Cottbus D-03046, Germany; E-Mails: (L.S.); (F.M.)
| | - Karlheinz Hoyermann
- Institut für Physikalische Chemie, Georg-August-Universität, Tammannstr. 6, Göttingen D-37077, Germany; E-Mails: (K.H.); (J.N.)
| | - Fabian Mauß
- Lehrstuhl Thermodynamik/Thermische Verfahrenstechnik, BrandenburgischeTechnische-Universität, Siemens-Halske-Ring 8, Cottbus D-03046, Germany; E-Mails: (L.S.); (F.M.)
| | - Jörg Nothdurft
- Institut für Physikalische Chemie, Georg-August-Universität, Tammannstr. 6, Göttingen D-37077, Germany; E-Mails: (K.H.); (J.N.)
| | - Thomas Zeuch
- Institut für Physikalische Chemie, Georg-August-Universität, Tammannstr. 6, Göttingen D-37077, Germany; E-Mails: (K.H.); (J.N.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +49-551-39-33126; Fax: +49-551-39-33117
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Lynch PT, Annesley CJ, Aul CJ, Yang X, Tranter RS. Recombination of Allyl Radicals in the High Temperature Fall-Off Regime. J Phys Chem A 2013; 117:4750-61. [DOI: 10.1021/jp402484v] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Patrick T. Lynch
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue,
Argonne, Illinois 60439, United States
| | - Christopher J. Annesley
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue,
Argonne, Illinois 60439, United States
| | - Christopher J. Aul
- Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77840, United States
| | - Xueliang Yang
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue,
Argonne, Illinois 60439, United States
| | - Robert S. Tranter
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue,
Argonne, Illinois 60439, United States
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