1
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Roy TK, Qian Y, Karlsson E, Rabayah R, Sojdak CA, Kozlowski MC, Karsili TNV, Lester MI. Vibrational spectroscopy and dissociation dynamics of cyclohexyl hydroperoxide. Chem Sci 2024; 15:6160-6167. [PMID: 38665513 PMCID: PMC11040651 DOI: 10.1039/d4sc00151f] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Accepted: 03/19/2024] [Indexed: 04/28/2024] Open
Abstract
Organic hydroperoxides (ROOH) are ubiquitous in the atmospheric oxidation of volatile organic compounds (VOCs) as well as in low-temperature oxidation of hydrocarbon fuels. The present work focuses on a prototypical cyclic hydroperoxide, cyclohexyl hydroperoxide (CHHP). The overtone OH stretch (2νOH) spectrum of jet-cooled CHHP is recorded by IR multiphoton excitation with UV laser-induced fluorescence detection of the resulting OH products. A distinctive IR feature is observed at 7012.5 cm-1. Two conformers of CHHP are predicted to have similar stabilities (within 0.2 kcal mol-1) and overtone OH stretch transitions (2νOH), yet are separated by a significant interconversion barrier. The IR power dependence indicates that absorption of three or more IR photons is required for dissociation of CHHP to cyclohexoxy (RO) and OH radical products. Accompanying high-level single- and multi-reference electronic structure calculations quantitatively support the experimental results. Calculations are extended to a range of organic hydroperoxides to examine trends in bond dissociation energies associated with RO + OH formation and compared with prior theoretical results.
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Affiliation(s)
- Tarun Kumar Roy
- Department of Chemistry, University of Pennsylvania Philadelphia PA 19104-6323 USA
| | - Yujie Qian
- Department of Chemistry, University of Pennsylvania Philadelphia PA 19104-6323 USA
| | - Elizabeth Karlsson
- Department of Chemistry, University of Pennsylvania Philadelphia PA 19104-6323 USA
| | - Rawan Rabayah
- Department of Chemistry, University of Pennsylvania Philadelphia PA 19104-6323 USA
| | - Christopher A Sojdak
- Department of Chemistry, University of Pennsylvania Philadelphia PA 19104-6323 USA
| | - Marisa C Kozlowski
- Department of Chemistry, University of Pennsylvania Philadelphia PA 19104-6323 USA
| | | | - Marsha I Lester
- Department of Chemistry, University of Pennsylvania Philadelphia PA 19104-6323 USA
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2
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Lahm ME, Bartlett MA, Liang T, Pu L, Allen WD, Schaefer HF. The multichannel i-propyl + O2 reaction system: A model of secondary alkyl radical oxidation. J Chem Phys 2023; 159:024305. [PMID: 37428067 DOI: 10.1063/5.0156705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 06/19/2023] [Indexed: 07/11/2023] Open
Abstract
The i-propyl + O2 reaction mechanism has been investigated by definitive quantum chemical methods to establish this system as a benchmark for the combustion of secondary alkyl radicals. Focal point analyses extrapolating to the ab initio limit were performed based on explicit computations with electron correlation treatments through coupled cluster single, double, triple, and quadruple excitations and basis sets up to cc-pV5Z. The rigorous coupled cluster single, double, and triple excitations/cc-pVTZ level of theory was used to fully optimize all reaction species and transition states, thus, removing some substantial flaws in reference geometries existing in the literature. The vital i-propylperoxy radical (MIN1) and its concerted elimination transition state (TS1) were found 34.8 and 4.4 kcal mol-1 below the reactants, respectively. Two β-hydrogen transfer transition states (TS2, TS2') lie above the reactants by (1.4, 2.5) kcal mol-1 and display large Born-Oppenheimer diagonal corrections indicative of nearby surface crossings. An α-hydrogen transfer transition state (TS5) is discovered 5.7 kcal mol-1 above the reactants that bifurcates into equivalent α-peroxy radical hanging wells (MIN3) prior to a highly exothermic dissociation into acetone + OH. The reverse TS5 → MIN1 intrinsic reaction path also displays fascinating features, including another bifurcation and a conical intersection of potential energy surfaces. An exhaustive conformational search of two hydroperoxypropyl (QOOH) intermediates (MIN2 and MIN3) of the i-propyl + O2 system located nine rotamers within 0.9 kcal mol-1 of the corresponding lowest-energy minima.
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Affiliation(s)
- Mitchell E Lahm
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Marcus A Bartlett
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Tao Liang
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Liang Pu
- College of Chemistry and Pharmacy, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China
| | - Wesley D Allen
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
- Allen Heritage Foundation, Dickson, Tennessee 37055, USA
| | - Henry F Schaefer
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
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3
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Chu T, Smith MC, Yang J, Liu M, Green WH. Theoretical study on the HACA chemistry of naphthalenyl radicals and acetylene: The formation of C
12
H
8
, C
14
H
8
, and C
14
H
10
species. INT J CHEM KINET 2020. [DOI: 10.1002/kin.21397] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Te‐Chun Chu
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts
| | - Mica C. Smith
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts
| | - Jeehyun Yang
- Department of Earth Atmospheric and Planetary Sciences Massachusetts Institute of Technology Cambridge Massachusetts
| | - Mengjie Liu
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts
| | - William H. Green
- Department of Chemical Engineering Massachusetts Institute of Technology Cambridge Massachusetts
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4
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Chu TC, Buras ZJ, Eyob B, Smith MC, Liu M, Green WH. Direct Kinetics and Product Measurement of Phenyl Radical + Ethylene. J Phys Chem A 2020; 124:2352-2365. [PMID: 32118435 PMCID: PMC7307927 DOI: 10.1021/acs.jpca.9b11543] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
![]()
The phenyl + ethylene (C6H5 + C2H4) reaction network was
explored experimentally and theoretically
to understand the temperature dependence of the reaction kinetics
and product distribution under various temperature and pressure conditions.
The flash photolysis apparatus combining laser absorbance spectroscopy
(LAS) and time-resolved molecular beam mass spectrometry (MBMS) was
used to study reactions on the C8H9 potential
energy surface (PES). In LAS experiments, 505.3 nm laser light selectively
probed C6H5 decay, and we measured the total
C6H5 consumption rate coefficients in the intermediate
temperature region (400–800 K), which connects previous experiments
performed in high-temperature (pyrolysis) and low-temperature (cavity-ring-down
methods) regions. From the quantum chemistry calculations by Tokmakov
and Lin using the G2M(RCC5)//B3LYP method, we constructed a kinetic
model and estimated phenomenological pressure-dependent rate coefficients, k(T, P), with the Arkane
package in the reaction mechanism generator. The MBMS experiments,
performed at 600–800 K and 10–50 Torr, revealed three
major product peaks: m/z = 105 (adducts,
mostly 2-phenylethyl radical, but also 1-phenylethyl radical, ortho-ethyl phenyl radical, and a spiro-fused ring radical),
104 (styrene, co-product with a H atom), and 78 (benzene, co-product
with C2H3 radical). Product branching ratios
were predicted by the model and validated by experiments for the first
time. At 600 K and 10 Torr, the yield ratio of the H-abstraction reaction
(forming benzene + C2H3) is measured to be 1.1%
and the H-loss channel (styrene + H) has a 2.5% yield ratio. The model
predicts 1.0% for H-abstraction and 2.3% for H-loss, which is within
the experimental error bars. The branching ratio and formation of
styrene increase at high temperature due to the favored formally direct
channel (1.0% at 600 K and 10 Torr, 5.8% at 800 K and 10 Torr in the
model prediction) and the faster β-scission reactions of C8H9 isomers. The importance of pressure dependence
in kinetics is verified by the increase in the yield of the stabilized
adduct from radical addition from 80.2% (800 K, 10 Torr) to 88.9%
(800 K, 50 Torr), at the expense of styrene + H. The pressure-dependent
model developed in this work is well validated by the LAS and MBMS
measurements and gives a complete picture of the C6H5 + C2H4 reaction.
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Affiliation(s)
- Te-Chun Chu
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Zachary J Buras
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Brook Eyob
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Mica C Smith
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Mengjie Liu
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - William H Green
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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5
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Assali M, Rakovsky J, Votava O, Fittschen C. Experimental determination of the rate constants of the reactions of HO
2
+ DO
2
and DO
2
+ DO
2. INT J CHEM KINET 2019. [DOI: 10.1002/kin.21342] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Mohamed Assali
- CNRS, UMR 8522 – PC2A – Physicochimie des Processus de Combustion et de l'AtmosphèreUniversité Lille Lille France
| | - Jozef Rakovsky
- J. Heyrovský Institute of Physical Chemistry v.v.i.Academy of Sciences of the Czech Republic Prague Czech Republic
| | - Ondrej Votava
- J. Heyrovský Institute of Physical Chemistry v.v.i.Academy of Sciences of the Czech Republic Prague Czech Republic
| | - Christa Fittschen
- CNRS, UMR 8522 – PC2A – Physicochimie des Processus de Combustion et de l'AtmosphèreUniversité Lille Lille France
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6
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Chu TC, Buras ZJ, Smith MC, Uwagwu AB, Green WH. From benzene to naphthalene: direct measurement of reactions and intermediates of phenyl radicals and acetylene. Phys Chem Chem Phys 2019; 21:22248-22258. [DOI: 10.1039/c9cp04554f] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
First-time measurement of time evolution of the main products and critical intermediates on phenyl HACA pathways with a validated pressure-dependent model.
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Affiliation(s)
- Te-Chun Chu
- Massachusetts Institute of Technology
- Cambridge
- USA
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7
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Harrison KA, Haidasz EA, Griesser M, Pratt DA. Inhibition of hydrocarbon autoxidation by nitroxide-catalyzed cross-dismutation of hydroperoxyl and alkylperoxyl radicals. Chem Sci 2018; 9:6068-6079. [PMID: 30079220 PMCID: PMC6053651 DOI: 10.1039/c8sc01575a] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 06/11/2018] [Indexed: 11/21/2022] Open
Abstract
Nitroxides are putative intermediates in the accepted reaction mechanisms of the diarylamine and hindered amine antioxidants that are universally added to preserve synthetic and natural hydrocarbon-based materials. New methodology which enables monitoring of hydrocarbon autoxidations at low rates of radical generation has revealed that diarylnitroxides and hindered nitroxides are far better inhibitors of unsaturated hydrocarbon autoxidation than their precursor amines, implying intervention of a different mechanism. Experimental and computational investigations suggest that the nitroxides catalyze the cross-dismutation of hydroperoxyl and alkylperoxyl radicals to yield O2 and a hydroperoxide, thereby halting the autoxidation chain reaction. The hydroperoxyl radicals - key players in hydrocarbon combustion, but essentially unknown in autoxidation - are proposed to derive from a tunneling-enhanced intramolecular (1,4-) hydrogen-atom transfer/elimination sequence from oxygenated radical addition intermediates. These insights suggest that nitroxides are preferred additives for the protection of hydrocarbon-based materials from autoxidation since they exhibit catalytic activity under conditions where their precursor amines are less effective and/or inefficiently converted to nitroxides in situ.
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Affiliation(s)
- Kareem A Harrison
- Department of Chemistry and Biomolecular Sciences , University of Ottawa , Ottawa , Ontario , Canada K1N 6N5 .
| | - Evan A Haidasz
- Department of Chemistry and Biomolecular Sciences , University of Ottawa , Ottawa , Ontario , Canada K1N 6N5 .
| | - Markus Griesser
- Department of Chemistry and Biomolecular Sciences , University of Ottawa , Ottawa , Ontario , Canada K1N 6N5 .
| | - Derek A Pratt
- Department of Chemistry and Biomolecular Sciences , University of Ottawa , Ottawa , Ontario , Canada K1N 6N5 .
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8
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Bartlett MA, Liang T, Pu L, Schaefer HF, Allen WD. The multichannel n-propyl + O2 reaction surface: Definitive theory on a model hydrocarbon oxidation mechanism. J Chem Phys 2018. [DOI: 10.1063/1.5017305] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Marcus A. Bartlett
- Center for Computational Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Tao Liang
- Center for Computational Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Liang Pu
- College of Chemistry & Pharmacy, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
| | - Henry F. Schaefer
- Center for Computational Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Wesley D. Allen
- Center for Computational Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
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9
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Song L, Pan X, Li Q, Ding Y, Yao L, Lin SH. Anharmonic Effect of N
-Propyl Peroxy Dissociation. J CHIN CHEM SOC-TAIP 2016. [DOI: 10.1002/jccs.201600091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Liguo Song
- Marine Engineering College; Dalian Maritime University; Dalian 116026 P. R. China
| | - Xinxiang Pan
- Marine Engineering College; Dalian Maritime University; Dalian 116026 P. R. China
| | - Qian Li
- Marine Engineering College; Dalian Maritime University; Dalian 116026 P. R. China
| | - Yang Ding
- Marine Engineering College; Dalian Maritime University; Dalian 116026 P. R. China
| | - Li Yao
- Marine Engineering College; Dalian Maritime University; Dalian 116026 P. R. China
| | - Sheng-Hsien Lin
- Department of Applied Chemistry; National Chiao-Tung University; Hsin-chu 10764 Taiwan
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10
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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] [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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11
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Welz O, Burke MP, Antonov IO, Goldsmith CF, Savee JD, Osborn DL, Taatjes CA, Klippenstein SJ, Sheps L. New Insights into Low-Temperature Oxidation of Propane from Synchrotron Photoionization Mass Spectrometry and Multiscale Informatics Modeling. J Phys Chem A 2015; 119:7116-29. [DOI: 10.1021/acs.jpca.5b01008] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Oliver Welz
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Michael P. Burke
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60493, United States
- Department
of Mechanical Engineering, Department of Chemical Engineering and
Data Sciences Institute, Columbia University, New York, New York 10027, United States
| | - Ivan O. Antonov
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - C. Franklin Goldsmith
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60493, United States
| | - John D. Savee
- 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
| | - Stephen J. Klippenstein
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60493, United States
| | - Leonid Sheps
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
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12
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Eskola AJ, Welz O, Savee JD, Osborn DL, Taatjes CA. Synchrotron Photoionization Mass Spectrometry Measurements of Product Formation in Low-Temperature n-Butane Oxidation: Toward a Fundamental Understanding of Autoignition Chemistry and n-C4H9 + O2/s-C4H9 + O2 Reactions. J Phys Chem A 2013; 117:12216-35. [DOI: 10.1021/jp408467g] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Arkke J. Eskola
- 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
| | - John D. Savee
- 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
| | - Craig A. Taatjes
- Combustion Research Facility, Sandia National Laboratories, Mail Stop
9055, Livermore, California 94551-0969, United States
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13
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Scheer AM, Welz O, Sasaki DY, Osborn DL, Taatjes CA. Facile Rearrangement of 3-Oxoalkyl Radicals is Evident in Low-Temperature Gas-Phase Oxidation of Ketones. J Am Chem Soc 2013; 135:14256-65. [DOI: 10.1021/ja405892y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [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
| | - Oliver Welz
- Combustion Research
Facility, Sandia National Laboratories, MS 9055, Livermore, California 94551, United States
| | - Darryl Y. Sasaki
- Biological
and
Materials Science, Sandia National Laboratories, MS 9292, Livermore, California 94551, United States
| | - David L. Osborn
- 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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14
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Welz O, Zádor J, Savee JD, Sheps L, Osborn DL, Taatjes CA. Low-Temperature Combustion Chemistry of n-Butanol: Principal Oxidation Pathways of Hydroxybutyl Radicals. J Phys Chem A 2013; 117:11983-2001. [DOI: 10.1021/jp403792t] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Oliver Welz
- Combustion
Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - Judit Zádor
- Combustion
Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - John D. Savee
- Combustion
Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - Leonid Sheps
- Combustion
Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - David L. Osborn
- Combustion
Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - Craig A. Taatjes
- Combustion
Research Facility, Mailstop 9055, Sandia National Laboratories, Livermore, California 94551-0969, United States
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15
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Villano SM, Carstensen HH, Dean AM. Rate Rules, Branching Ratios, and Pressure Dependence of the HO2 + Olefin Addition Channels. J Phys Chem A 2013; 117:6458-73. [DOI: 10.1021/jp405262r] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Stephanie M. Villano
- Chemical
and Biological Engineering Department, Colorado
School of Mines, Golden Colorado 80301, United States
| | - Hans-Heinrich Carstensen
- Chemical
and Biological Engineering Department, Colorado
School of Mines, Golden Colorado 80301, United States
| | - Anthony M. Dean
- Chemical
and Biological Engineering Department, Colorado
School of Mines, Golden Colorado 80301, United States
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16
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Goldsmith CF, Green WH, Klippenstein SJ. Role of O2 + QOOH in Low-Temperature Ignition of Propane. 1. Temperature and Pressure Dependent Rate Coefficients. J Phys Chem A 2012; 116:3325-46. [DOI: 10.1021/jp210722w] [Citation(s) in RCA: 196] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- C. Franklin Goldsmith
- Department of Chemical
Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department of Inorganic
Chemistry, Fritz Haber Institute, Berlin 14195, Germany
| | - William H. Green
- Department of Chemical
Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Stephen J. Klippenstein
- Chemical Sciences
and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
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17
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Zádor J, Klippenstein SJ, Miller JA. Pressure-Dependent OH Yields in Alkene + HO2 Reactions: A Theoretical Study. J Phys Chem A 2011; 115:10218-25. [DOI: 10.1021/jp2059276] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Judit Zádor
- Combustion Research Facility, Sandia National Laboratories, Livermore, California
94551-0969, United States
| | - Stephen J. Klippenstein
- Chemical Sciences and Engineering
Division, Argonne National Laboratory,
Argonne, Illinois 60439, United States
| | - James A. Miller
- Chemical Sciences and Engineering
Division, Argonne National Laboratory,
Argonne, Illinois 60439, United States
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18
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Asatryan R, Bozzelli JW. Formation of a Criegee intermediate in the low-temperature oxidation of dimethyl sulfoxide. Phys Chem Chem Phys 2008; 10:1769-80. [DOI: 10.1039/b716179d] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Knepp AM, Meloni G, Jusinski LE, Taatjes CA, Cavallotti C, Klippenstein SJ. Theory, measurements, and modeling of OH and HO2 formation in the reaction of cyclohexyl radicals with O2. Phys Chem Chem Phys 2007; 9:4315-31. [PMID: 17687479 DOI: 10.1039/b705934e] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The production of OH and HO(2) in Cl-initiated oxidation of cyclohexane has been measured using pulsed-laser photolytic initiation and continuous-laser absorption detection. The experimental data are modeled by master equation calculations that employ new G2(MP2)-like ab initio characterizations of important stationary points on the cyclo-C(6)H(11)O(2) surface. These ab initio calculations are a substantial expansion on previously published characterizations, including explicit consideration of conformational changes (chair-boat, axial-equatorial) and torsional potentials. The rate constants for the decomposition and ring-opening of cyclohexyl radical are also computed with ab initio based transition state theory calculations. Comparison of kinetic simulations based on the master equation results with the present experimental data and with literature determinations of branching fractions suggests adjustment of several transition state energies below their ab initio values. Simulations with the adjusted values agree well with the body of experimental data. The results once again emphasize the importance of both direct and indirect components of the kinetics for the production of both HO(2) and OH in radical + O(2) reactions.
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Affiliation(s)
- Adam M Knepp
- Combustion Research Facility, Mail Stop 9055, Sandia National Laboratories, Livermore, CA 94551-0969, USA
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