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Pekkanen TT, Timonen RS, Ramu EA, Lendvay G, Eskola AJ. Temperature and Pressure Dependence of the Reaction between Ethyl Radical and Molecular Oxygen: Experiments and Master Equation Simulations. J Phys Chem A 2023; 127:1302-1313. [PMID: 36696672 PMCID: PMC9923755 DOI: 10.1021/acs.jpca.2c07780] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We have used laser-photolysis - photoionization mass-spectrometry to measure the rate coefficient for the reaction between ethyl radical and molecular oxygen as a function of temperature (190-801 K) and pressure (0.2-6 Torr) under pseudo-first-order conditions ([He] ≫ [O2] ≫ [C2H5•]). Multiple ethyl precursor, photolysis wavelength, reactor material, and coating combinations were used. We reinvestigated the temperature dependence of the title reaction's rate coefficient to resolve inconsistencies in existing data. The current results indicate that some literature values for the rate coefficient may indeed be slightly too large. The experimental work was complemented with master equation simulations. We used the current and some previous rate coefficient measurements to optimize the values of key parameters in the master equation model. After optimization, the model was able to reproduce experimental falloff curves and C2H4 + HO2• yields. We then used the model to perform simulations over wide temperature (200-1500 K) and pressure (10-4-102 bar) ranges and provide the results in PLOG format to facilitate their use in atmospheric and combustion models.
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Affiliation(s)
- Timo T. Pekkanen
- Department
of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio
1), 00014 Helsinki, Finland
| | - Raimo S. Timonen
- Department
of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio
1), 00014 Helsinki, Finland
| | - Elli A. Ramu
- Department
of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio
1), 00014 Helsinki, Finland
| | - György Lendvay
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural
Sciences, Magyar Tudósok krt. 2, Budapest H-1117, Hungary
| | - Arkke J. Eskola
- Department
of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio
1), 00014 Helsinki, Finland,
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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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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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Pekkanen TT, Timonen RS, Robertson SH, Lendvay G, Joshi SP, Reijonen TT, Eskola AJ. An experimental and computational study of the reaction between 2-methylallyl radicals and oxygen molecules: optimizing master equation parameters with trace fitting. Phys Chem Chem Phys 2022; 24:4729-4742. [PMID: 35142299 DOI: 10.1039/d1cp05591g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
We have investigated the reaction between 2-methylallyl radicals and oxygen molecules with experimental and computational methods. Kinetic experiments were conducted in a tubular laminar flow reactor using laser photolysis for radical production and photoionization mass spectrometry for detection. The reaction was investigated as a function of temperature (203-730 K) and pressure (0.2-9 torr) in helium and nitrogen bath gases. At low temperatures (T < 410 K), the reaction proceeds by a barrierless reaction to form 2-methylallylperoxyl. Equilibration of the peroxyl adduct and the reactants was observed between 350-410 K. Measurements were extended to even higher temperatures, up to 730 K, but no reaction could be observed. Master equation simulations of the reaction system were performed with the MESMER program. Kinetic parameters in the master equation model were optimized by direct fitting to time-resolved experimental 2-methylallyl traces. Trace fitting is a recently implemented novel feature in MESMER. The trace approach was compared with the more traditional approach where one uses experimental rate coefficients for parameter optimization. The optimized parameters yielded by the two approaches are very similar and do an excellent job at reproducing the experimental data. The optimized master equation model was then used to simulate the reaction under study over a wide temperature and pressure range, from 200 K and 0.01 bar to 1500 K and 100 bar. The simulations predict a small phenomenological rate coefficient under autoignition conditions; about 1 × 10-18 cm3 s-1 at 400 K and 5 × 10-16 cm3 s-1 at 1000 K. We provide modified Arrhenius expressions in PLOG format for the most important product channels to facilitate the use of our results in combustion models.
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Affiliation(s)
- Timo T Pekkanen
- Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), 00014 Helsinki, Finland.
| | - Raimo S Timonen
- Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), 00014 Helsinki, Finland.
| | | | - György Lendvay
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok krt. 2., Budapest H-1117, Hungary
| | - Satya P Joshi
- Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), 00014 Helsinki, Finland.
| | - Timo T Reijonen
- Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), 00014 Helsinki, Finland.
| | - Arkke J Eskola
- Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), 00014 Helsinki, Finland.
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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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Joshi SP, Pekkanen TT, Seal P, Timonen RS, Eskola AJ. An experimental and master-equation modeling study of the kinetics of the reaction between resonance-stabilized (CH 3) 2CCHCH 2 radical and molecular oxygen. Phys Chem Chem Phys 2021; 23:20419-20433. [PMID: 34494036 DOI: 10.1039/d1cp02210e] [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: 11/21/2022]
Abstract
The kinetics of the reaction between resonance-stabilized (CH3)2CCHCH2 radical (R) and O2 has been investigated using photoionization mass spectrometry, and master equation (ME) simulations were performed to support the experimental results. The kinetic measurements of the (CH3)2CCHCH2 + O2 reaction (1) were carried out at low helium bath-gas pressures (0.2-5.7 Torr) and over a wide temperature range (238-660 K). Under low temperature (238-298 K) conditions, the pressure-dependent bimolecular association reaction R + O2 → ROO determines kinetics, until at an intermediate temperature range (325-373 K) the ROO adduct becomes thermally unstable and increasingly dissociates back to the reactants with increasing temperature. The initial association of O2 with (CH3)2CCHCH2 radical occurs on two distinct sites: terminal 1(t) and non-terminal 1(nt) sites on R, leading to the barrierless formation of ROO(t) and ROO(nt) adducts, respectively. Important for autoignition modelling of olefinic compounds, bimolecular reaction channels appear to open for the R + O2 reaction at high temperatures (T > 500 K) and pressure-independent bimolecular rate coefficients of reaction (1) with a weak positive temperature dependence, (2.8-4.6) × 10-15 cm3 molecule-1 s-1, were measured in the temperature range of 500-660 K. At a temperature of 501 K, a product signal of reaction (1) was observed at m/z = 68, probably originating from isoprene. To explore the reaction mechanism of reaction (1), quantum chemical calculations and ME simulations were performed. According to the ME simulations, without any adjustment to energies, the most important and second most important product channels at the high temperatures are isoprene + HO2 (yield > 91%) and (2R/S)-3-methyl-1,2-epoxybut-3-ene + OH (yield < 8%). After modest adjustments to ROO(t) and ROO(nt) well-depths (∼0.7 kcal mol-1 each) and barrier height for the transition state associated with the kinetically most dominant channel, R + O2 → isoprene + HO2 (∼2.2 kcal mol-1), the ME model was able to reproduce the experimental findings. Modified Arrhenius expressions for the kinetically important reaction channels are enclosed to facilitate the use of current results in combustion models.
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Affiliation(s)
- Satya P Joshi
- Molecular Science, Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014, Helsinki, Finland.
| | - Timo T Pekkanen
- Molecular Science, Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014, Helsinki, Finland.
| | - Prasenjit Seal
- Molecular Science, Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014, Helsinki, Finland.
| | - Raimo S Timonen
- Molecular Science, Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014, Helsinki, Finland.
| | - Arkke J Eskola
- Molecular Science, Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014, Helsinki, Finland.
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Abstract
The kinetics of (CH3)2CCH + O2 (1) and (CH3)2CCCH3 + O2 (2) reactions have been measured as a function of temperature (223-600 K) at low pressures (0.4-2 Torr) using a tubular laminar flow reactor coupled to a photoionization mass spectrometer (PIMS). These reactions are important for accurate modeling of unsaturated hydrocarbon combustion. Photolysis of a brominated precursor by a pulsed excimer laser radiation at 248 nm wavelength along the flow reactor axis was used for the production of radicals. The measured bimolecular rate coefficient of reaction 1 shows a negative temperature dependence over the temperature range 223-384 K and becomes temperature independent at higher temperatures. The bimolecular rate coefficient of reaction 2 exhibits a negative temperature dependence throughout the experimental temperature range. The bimolecular rate coefficients of reactions 1 and 2 are expected to be at the high-pressure limit under the current experimental conditions, and the following values are obtained at 298 K: k1(298 K) = (4.5 ± 0.5) × 10-12 cm3 s-1 and k2(298 K) = (8.9 ± 1.0) × 10-12 cm3 s-1. The observed products for reactions 1 and 2 were CH3COCH3 and CH3 + CH3COCH3, respectively. Substituting both β-hydrogens in the vinyl radical (CH2CH) with methyl groups decreases the rate coefficient of the CH2CH + O2 reaction by about 50%. However, the rate coefficient of the triply substituted (CH3)2CCCH3 radical reaction with O2 is almost identical to the CH2CH + O2 rate coefficient under the covered temperature range.
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Affiliation(s)
- Satya P Joshi
- Department of Chemistry , University of Helsinki , P.O. Box 55 (A.I. Virtasen aukio 1), FI-00014 Helsinki , Finland
| | - Timo T Pekkanen
- Department of Chemistry , University of Helsinki , P.O. Box 55 (A.I. Virtasen aukio 1), FI-00014 Helsinki , Finland
| | - Raimo S Timonen
- Department of Chemistry , University of Helsinki , P.O. Box 55 (A.I. Virtasen aukio 1), FI-00014 Helsinki , Finland
| | - Arkke J Eskola
- Department of Chemistry , University of Helsinki , P.O. Box 55 (A.I. Virtasen aukio 1), FI-00014 Helsinki , Finland
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Döntgen M, Pekkanen TT, Joshi SP, Timonen RS, Eskola AJ. Oxidation Kinetics and Thermodynamics of Resonance-Stabilized Radicals: The Pent-1-en-3-yl + O 2 Reaction. J Phys Chem A 2019; 123:7897-7910. [PMID: 31446757 PMCID: PMC7076695 DOI: 10.1021/acs.jpca.9b03923] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 08/14/2019] [Indexed: 11/29/2022]
Abstract
The kinetics and thermochemistry of the pent-1-en-3-yl radical reaction with molecular oxygen (CH2CHCHCH2CH3 + O2) has been studied by both experimental and computational methods. The bimolecular rate coefficient of the reaction was measured as a function of temperature (198-370 K) and pressure (0.2-4.5 Torr) using laser photolysis-photoionization mass-spectrometry. Quantum chemical calculations were used to explore the potential energy surface of the reaction, after which Rice-Ramsperger-Kassel-Marcus theory/master equation simulations were performed to investigate the reaction. The experimental data were used to adjust key parameters, such as well depths, in the master equation model within methodological uncertainties. The master equation simulations suggest that the formation rates of the two potential RO2 adducts are equal and that the reaction to QOOH is slower than for saturated hydrocarbons. The initial addition reaction, CH2CHCHCH2CH3 + O2, is found to be barrierless when accounting for multireference effects. This is in agreement with the current experimental data, as well as with past experimental data for the allyl + O2 reaction. Finally, we conducted numerical simulations of the pent-1-en-3-yl + O2 reaction system and observed significant amounts of penta-1,3-diene being formed under engine-relevant conditions.
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Affiliation(s)
- Malte Döntgen
- Department
of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FI-00014, Helsinki, Finland
- School
of Engineering, Brown University, Providence, Rhode Island 02912, United States
| | - Timo T. Pekkanen
- Department
of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FI-00014, Helsinki, Finland
| | - Satya P. Joshi
- Department
of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FI-00014, Helsinki, Finland
| | - Raimo S. Timonen
- Department
of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FI-00014, Helsinki, Finland
| | - Arkke J. Eskola
- Department
of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FI-00014, Helsinki, Finland
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Joshi S, Pekkanen TT, Timonen RS, Lendvay G, Eskola AJ. Kinetics of the Methyl-Vinyl Radical + O 2 Reactions Associated with Propene Oxidation. J Phys Chem A 2019; 123:999-1006. [PMID: 30608168 PMCID: PMC6727624 DOI: 10.1021/acs.jpca.8b11017] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 12/28/2018] [Indexed: 11/29/2022]
Abstract
The bimolecular rate coefficients of reactions CH3CCH2 + O2 (1) and cis/ trans-CH3CHCH + O2 (2a/3a) have been measured using a tubular laminar flow reactor coupled with a photoionization mass spectrometer (PIMS). These reactions are relevant in the combustion of propene. Pulsed excimer laser photolysis of a ketone or a bromide precursor molecule at 193 or 248 nm wavelength was used to produce radicals of interest homogeneously along the reactor. Time-resolved experiments were performed under pseudo-first-order conditions at low pressure (0.3-1.5 Torr) over the temperature range 220-660 K. The measured bimolecular rate coefficients were found to be independent of bath gas concentration. The bimolecular rate coefficients possess negative temperature dependence at low temperatures ( T < 420 K) and appear to be independent of temperature at high temperatures ( T > 420 K). Observed products of the reaction CH3CCH2 + O2 were CH3 and H2CO, while for the reaction cis/trans-CH3CHCH + O2, observed products were CH3CHO and HCO. Current results indicate that the reaction mechanism of both reactions is analogous to that of C2H3 + O2. Methyl substitution of the vinyl radical changes its reactivity toward O2 upward by ca. 50% if it involves the α-position and downward by ca. 30% if the methyl group takes either of the β-positions, respectively.
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Affiliation(s)
- Satya
P. Joshi
- Department
of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FI-00014, Helsinki, Finland
| | - Timo T. Pekkanen
- Department
of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FI-00014, Helsinki, Finland
| | - Raimo S. Timonen
- Department
of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FI-00014, Helsinki, Finland
| | - György Lendvay
- Institute
of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok krt. 2, Budapest, H-1117, Hungary
| | - Arkke J. Eskola
- Department
of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FI-00014, Helsinki, Finland
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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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11
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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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12
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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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13
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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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14
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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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15
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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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16
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Pekkanen TT, Arppe SL, Eskola AJ, Rissanen MP, Timonen RS. An Experimental Study of the Kinetics of the Reactions of Isopropyl,sec-Butyl, andtert-Butyl Radicals with Molecular Chlorine at Low Pressures (0.5-7.0 Torr) in the Temperature Range 190-480 K. INT J CHEM KINET 2016. [DOI: 10.1002/kin.21034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Timo T. Pekkanen
- Department of Chemistry; University of Helsinki; P.O. Box 55 00014 Helsinki Finland
| | - Suula L. Arppe
- Department of Chemistry; University of Helsinki; P.O. Box 55 00014 Helsinki Finland
| | - Arkke J. Eskola
- Department of Chemistry; University of Helsinki; P.O. Box 55 00014 Helsinki Finland
| | - Matti P. Rissanen
- Department of Physics; University of Helsinki; P.O. Box 64 00014 Helsinki Finland
| | - Raimo S. Timonen
- Department of Chemistry; University of Helsinki; P.O. Box 55 00014 Helsinki Finland
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17
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Moshammer K, Jasper AW, Popolan-Vaida DM, Lucassen A, Diévart P, Selim H, Eskola AJ, Taatjes CA, Leone SR, Sarathy SM, Ju Y, Dagaut P, Kohse-Höinghaus K, Hansen N. Detection and Identification of the Keto-Hydroperoxide (HOOCH2OCHO) and Other Intermediates during Low-Temperature Oxidation of Dimethyl Ether. J Phys Chem A 2015; 119:7361-74. [PMID: 25695304 DOI: 10.1021/acs.jpca.5b00101] [Citation(s) in RCA: 115] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this paper we report the detection and identification of the keto-hydroperoxide (hydroperoxymethyl formate, HPMF, HOOCH2OCHO) and other partially oxidized intermediate species arising from the low-temperature (540 K) oxidation of dimethyl ether (DME). These observations were made possible by coupling a jet-stirred reactor with molecular-beam sampling capabilities, operated near atmospheric pressure, to a reflectron time-of-flight mass spectrometer that employs single-photon ionization via tunable synchrotron-generated vacuum-ultraviolet radiation. On the basis of experimentally observed ionization thresholds and fragmentation appearance energies, interpreted with the aid of ab initio calculations, we have identified HPMF and its conceivable decomposition products HC(O)O(O)CH (formic acid anhydride), HC(O)OOH (performic acid), and HOC(O)OH (carbonic acid). Other intermediates that were detected and identified include HC(O)OCH3 (methyl formate), cycl-CH2-O-CH2-O- (1,3-dioxetane), CH3OOH (methyl hydroperoxide), HC(O)OH (formic acid), and H2O2 (hydrogen peroxide). We show that the theoretical characterization of multiple conformeric structures of some intermediates is required when interpreting the experimentally observed ionization thresholds, and a simple method is presented for estimating the importance of multiple conformers at the estimated temperature (∼100 K) of the present molecular beam. We also discuss possible formation pathways of the detected species: for example, supported by potential energy surface calculations, we show that performic acid may be a minor channel of the O2 + ĊH2OCH2OOH reaction, resulting from the decomposition of the HOOCH2OĊHOOH intermediate, which predominantly leads to the HPMF.
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Affiliation(s)
- Kai Moshammer
- †Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, United States.,‡Department of Chemistry, Bielefeld University, D-33615 Bielefeld, Germany
| | - Ahren W Jasper
- †Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Denisia M Popolan-Vaida
- §Departments of Chemistry and Physics, University of California, Berkeley, California 94720, United States.,∥Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Arnas Lucassen
- †Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Pascal Diévart
- ⊥Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, United States
| | - Hatem Selim
- #Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Arkke J Eskola
- †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 R Leone
- §Departments of Chemistry and Physics, University of California, Berkeley, California 94720, United States.,∥Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - S Mani Sarathy
- #Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Yiguang Ju
- ⊥Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, United States
| | - Philippe Dagaut
- ∇Centre National de la Recherche Scientifique (CNRS), INSIS, 45071 Orléans Cedex 2, France
| | | | - Nils Hansen
- †Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
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18
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Savee JD, Papajak E, Rotavera B, Huang H, Eskola AJ, Welz O, Sheps L, Taatjes CA, Zádor J, Osborn DL. Direct observation and kinetics of a hydroperoxyalkyl radical (QOOH). Science 2015; 347:643-6. [DOI: 10.1126/science.aaa1495] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Oxidation of organic compounds in combustion and in Earth’s troposphere is mediated by reactive species formed by the addition of molecular oxygen (O2) to organic radicals. Among the most crucial and elusive of these intermediates are hydroperoxyalkyl radicals, often denoted “QOOH.” These species and their reactions with O2 are responsible for the radical chain branching that sustains autoignition and are implicated in tropospheric autoxidation that can form low-volatility, highly oxygenated organic aerosol precursors. We report direct observation and kinetics measurements of a QOOH intermediate in the oxidation of 1,3-cycloheptadiene, a molecule that offers insight into both resonance-stabilized and nonstabilized radical intermediates. The results establish that resonance stabilization dramatically changes QOOH reactivity and, hence, that oxidation of unsaturated organics can produce exceptionally long-lived QOOH intermediates.
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19
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Welz O, Eskola AJ, Sheps L, Rotavera B, Savee JD, Scheer AM, Osborn DL, Lowe D, Murray Booth A, Xiao P, Anwar H Khan M, Percival CJ, Shallcross DE, Taatjes CA. Rate coefficients of C(1) and C(2) Criegee intermediate reactions with formic and acetic Acid near the collision limit: direct kinetics measurements and atmospheric implications. Angew Chem Int Ed Engl 2014; 53:4547-50. [PMID: 24668781 PMCID: PMC4499262 DOI: 10.1002/anie.201400964] [Citation(s) in RCA: 147] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Indexed: 11/17/2022]
Abstract
Rate coefficients are directly determined for the reactions of the Criegee intermediates (CI) CH2OO and CH3CHOO with the two simplest carboxylic acids, formic acid (HCOOH) and acetic acid (CH3COOH), employing two complementary techniques: multiplexed photoionization mass spectrometry and cavity-enhanced broadband ultraviolet absorption spectroscopy. The measured rate coefficients are in excess of 1×10−10 cm3 s−1, several orders of magnitude larger than those suggested from many previous alkene ozonolysis experiments and assumed in atmospheric modeling studies. These results suggest that the reaction with carboxylic acids is a substantially more important loss process for CIs than is presently assumed. Implementing these rate coefficients in global atmospheric models shows that reactions between CI and organic acids make a substantial contribution to removal of these acids in terrestrial equatorial areas and in other regions where high CI concentrations occur such as high northern latitudes, and implies that sources of acids in these areas are larger than previously recognized.
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Affiliation(s)
- Oliver Welz
- Combustion Research Facility, Sandia National Laboratories, Stop 9055, Livermore, CA 94551-0969 (USA)
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20
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Welz O, Eskola AJ, Sheps L, Rotavera B, Savee JD, Scheer AM, Osborn DL, Lowe D, Murray Booth A, Xiao P, Anwar H. Khan M, Percival CJ, Shallcross DE, Taatjes CA. Rate Coefficients of C1 and C2 Criegee Intermediate Reactions with Formic and Acetic Acid Near the Collision Limit: Direct Kinetics Measurements and Atmospheric Implications. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400964] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Rissanen MP, Eskola AJ, Nguyen TL, Barker JR, Liu J, Liu J, Halme E, Timonen RS. CH2NH2 + O2 and CH3CHNH2 + O2 Reaction Kinetics: Photoionization Mass Spectrometry Experiments and Master Equation Calculations. J Phys Chem A 2014; 118:2176-86. [DOI: 10.1021/jp411238e] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [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)
- Matti P. Rissanen
- Laboratory
of Physical Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland
- Division
of Atmospheric Sciences, Department of Physics, University of Helsinki, P.O. Box 64, FIN-00014 Helsinki, Finland
| | - Arkke J. Eskola
- Laboratory
of Physical Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland
| | - Thanh Lam Nguyen
- Department of Chemistry & Biochemistry, The University of Texas at Austin, Texas 78712-0165, United States
| | - John R. Barker
- Department
of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109-2143, United States
| | - Jingjing Liu
- Institute
of Theoretical Chemistry, State Key Laboratory of Theoretical and
Computational Chemistry, Jilin University, Changchun 130023, China
| | - Jingyao Liu
- Institute
of Theoretical Chemistry, State Key Laboratory of Theoretical and
Computational Chemistry, Jilin University, Changchun 130023, China
| | - Erkki Halme
- Laboratory
of Physical Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland
| | - Raimo S. Timonen
- Laboratory
of Physical Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland
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22
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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23
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Savee JD, Lockyear JF, Borkar S, Eskola AJ, Welz O, Taatjes CA, Osborn DL. Note: Absolute photoionization cross-section of the vinyl radical. J Chem Phys 2013; 139:056101. [DOI: 10.1063/1.4817320] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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24
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Percival CJ, Welz O, Eskola AJ, Savee JD, Osborn DL, Topping DO, Lowe D, Utembe SR, Bacak A, McFiggans G, Cooke MC, Xiao P, Archibald† AT, Jenkin ME, Derwent RG, Riipinen I, Mok DWK, Lee EPF, Dyke JM, Taatjes CA, Shallcross DE. Regional and global impacts of Criegee intermediates on atmospheric sulphuric acid concentrations and first steps of aerosol formation. Faraday Discuss 2013; 165:45-73. [DOI: 10.1039/c3fd00048f] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [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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25
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Rissanen MP, Eskola AJ, Timonen RS. Kinetics of the brominated alkyl radical (CHBr2
, CH3
CHBr) reactions with NO2
in the temperature range 250-480 K. INT J CHEM KINET 2012. [DOI: 10.1002/kin.20725] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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26
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Rissanen MP, Amedro D, Eskola AJ, Kurten T, Timonen RS. Kinetic (T = 201-298 K) and equilibrium (T = 320-420 K) measurements of the C3H5 + O2 ⇆ C3H5O2 reaction. J Phys Chem A 2012; 116:3969-78. [PMID: 22500811 DOI: 10.1021/jp209977h] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [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 kinetics and equilibrium of the allyl radical reaction with molecular oxygen have been studied in direct measurements using temperature-controlled tubular flow reactor coupled to a laser photolysis/photoionization mass spectrometer. In low-temperature experiments (T = 201-298 K), association kinetics were observed, and the measured time-resolved C(3)H(5) radical signals decayed exponentially to the signal background. In this range, the determined rate coefficients exhibited a negative temperature dependence and were observed to depend on the carrier-gas (He) pressure {p = 0.4-36 Torr, [He] = (1.7-118.0) × 10(16) cm(-3)}. The bimolecular rate coefficients obtained vary in the range (0.88-11.6) × 10(-13) cm(3) s(-1). In higher-temperature experiments (T = 320-420 K), the C(3)H(5) radical signal did not decay to the signal background, indicating equilibration of the reaction. By measuring the radical decay rate under these conditions as a function of temperature and following typical second- and third-law procedures, plotting the resulting ln K(p) values versus 1/T in a modified van't Hoff plot, the thermochemical parameters of the reaction were extracted. The second-law treatment resulted in values of ΔH(298)° = -78.3 ± 1.1 kJ mol(-1) and ΔS(298)° = -129.9 ± 3.1 J mol(-1) K(-1), with the uncertainties given as one standard error. When results from a previous investigation were taken into account and the third-law method was applied, the reaction enthalpy was determined as ΔH(298)° = -75.6 ± 2.3 kJ mol(-1).
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Affiliation(s)
- Matti P Rissanen
- Laboratory of Physical Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 Helsinki, Finland
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27
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Taatjes CA, Welz O, Eskola AJ, Savee JD, Osborn DL, Lee EPF, Dyke JM, Mok DWK, Shallcross DE, Percival CJ. Direct measurement of Criegee intermediate (CH2OO) reactions with acetone, acetaldehyde, and hexafluoroacetone. Phys Chem Chem Phys 2012; 14:10391-400. [DOI: 10.1039/c2cp40294g] [Citation(s) in RCA: 123] [Impact Index Per Article: 10.3] [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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28
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Rissanen MP, Eskola AJ, Timonen RS. Kinetics of the reactions of CH2Cl, CH3CHCl, and CH3CCl2 radicals with Cl2 in the temperature range 191-363 K. J Phys Chem A 2010; 114:4805-10. [PMID: 20136084 DOI: 10.1021/jp909419v] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The kinetics of three chlorinated free radical reactions with Cl(2) have been studied in direct time-resolved measurements. Radicals were produced in low initial concentrations by pulsed laser photolysis at 193 nm, and the subsequent decays of the radical concentrations were measured under pseudo-first-order conditions using photoionization mass spectrometer (PIMS). The bimolecular rate coefficients of the CH(3)CHCl + Cl(2) reaction obtained from the current measurements exhibit negative temperature dependence and can be expressed by the equation k(CH(3)CHCl + Cl(2)) = ((3.02 +/- 0.14) x 10(-12))(T/300 K)(-1.89+/-0.19) cm(3) molecule(-1) s(-1) (1.7-5.4 Torr, 191-363 K). For the CH(3)CCl(2) + Cl(2) reaction the current results could be fitted with the equation k(CH(3)CCl(2) + Cl(2)) = ((1.23 +/- 0.02) x 10(-13))(T/300 K)(-0.26+/-0.10) cm(3) molecule(-1) s(-1) (3.9-5.1 Torr, 240-363 K). The measured rate coefficients for the CH(2)Cl + Cl(2) reaction plotted as a function of temperature show a minimum at about T = 240 K: first decreasing with increasing temperature and then, above the limit, increasing with temperature. The determined reaction rate coefficients can be expressed as k(CH(2)Cl + Cl(2)) = ((2.11 +/- 1.29) x 10(-14)) exp(773 +/- 183 K/T)(T/300 K)(3.26+/-0.67) cm(3) molecule(-1) s(-1) (4.0-5.6 Torr, 201-363 K). The rate coefficients for the CH(3)CCl(2) + Cl(2) and CH(2)Cl + Cl(2) reactions can be combined with previous results to obtain: k(combined)(CH(3)CCl(2) + Cl(2)) = ((4.72 +/- 1.66) x 10(-15)) exp(971 +/- 106 K/T)(T/300 K)(3.07+/-0.23) cm(3) molecule(-1) s(-1) (3.1-7.4 Torr, 240-873 K) and k(combined)(CH(2)Cl + Cl(2)) = ((5.18 +/- 1.06) x 10(-14)) exp(525 +/- 63 K/T)(T/300 K)(2.52+/-0.13) cm(3) molecule(-1) s(-1) (1.8-5.6 Torr, 201-873 K). All the uncertainties given refer only to the 1sigma statistical uncertainties obtained from the fitting, and the estimated overall uncertainty in the determined bimolecular rate coefficients is about +/-15%.
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Affiliation(s)
- Matti P Rissanen
- Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), Helsinki FIN-00014, Finland
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Rissanen MP, Arppe SL, Eskola AJ, Tammi MM, Timonen RS. Kinetics of the R + NO2 Reactions (R = i-C3H7, n-C3H7, s-C4H9, and t-C4H9) in the Temperature Range 201−489 K. J Phys Chem A 2010; 114:4811-7. [DOI: 10.1021/jp909396v] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Matti P. Rissanen
- Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), Helsinki FIN-00014, Finland
| | - Suula L. Arppe
- Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), Helsinki FIN-00014, Finland
| | - Arkke J. Eskola
- Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), Helsinki FIN-00014, Finland
| | - Matti M. Tammi
- Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), Helsinki FIN-00014, Finland
| | - Raimo S. Timonen
- Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), Helsinki FIN-00014, Finland
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Rissanen MP, Eskola AJ, Savina E, Timonen RS. Kinetics of the Reactions of CH3CH2, CH3CHCl, and CH3CCl2 Radicals with NO2 in the Temperature Range 221−363 K. J Phys Chem A 2009; 113:1753-9. [DOI: 10.1021/jp809193w] [Citation(s) in RCA: 8] [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: 11/28/2022]
Affiliation(s)
- Matti P. Rissanen
- Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 Finland
| | - Arkke J. Eskola
- Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 Finland
| | - Elena Savina
- Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 Finland
| | - Raimo S. Timonen
- Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 Finland
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Eskola AJ, Timonen RS, Marshall P, Chesnokov EN, Krasnoperov LN. Rate Constants and Hydrogen Isotope Substitution Effects in the CH3 + HCl and CH3 + Cl2 Reactions. J Phys Chem A 2008; 112:7391-401. [DOI: 10.1021/jp801999w] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [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)
- Arkke J. Eskola
- Laboratory of Physical Chemistry, P.O. Box 55, FIN-00014 University of Helsinki, Finland, Department of Chemistry, University of North Texas, P.O., Box 305070, Denton, Texas 76203-5070, Institute of Chemical Kinetics and Combustion, Institutskaya 3, Novosibirsk, 630090, Russia, and Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102
| | - Raimo S. Timonen
- Laboratory of Physical Chemistry, P.O. Box 55, FIN-00014 University of Helsinki, Finland, Department of Chemistry, University of North Texas, P.O., Box 305070, Denton, Texas 76203-5070, Institute of Chemical Kinetics and Combustion, Institutskaya 3, Novosibirsk, 630090, Russia, and Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102
| | - Paul Marshall
- Laboratory of Physical Chemistry, P.O. Box 55, FIN-00014 University of Helsinki, Finland, Department of Chemistry, University of North Texas, P.O., Box 305070, Denton, Texas 76203-5070, Institute of Chemical Kinetics and Combustion, Institutskaya 3, Novosibirsk, 630090, Russia, and Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102
| | - Evgeni N. Chesnokov
- Laboratory of Physical Chemistry, P.O. Box 55, FIN-00014 University of Helsinki, Finland, Department of Chemistry, University of North Texas, P.O., Box 305070, Denton, Texas 76203-5070, Institute of Chemical Kinetics and Combustion, Institutskaya 3, Novosibirsk, 630090, Russia, and Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102
| | - Lev N. Krasnoperov
- Laboratory of Physical Chemistry, P.O. Box 55, FIN-00014 University of Helsinki, Finland, Department of Chemistry, University of North Texas, P.O., Box 305070, Denton, Texas 76203-5070, Institute of Chemical Kinetics and Combustion, Institutskaya 3, Novosibirsk, 630090, Russia, and Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102
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Eskola AJ, Wojcik-Pastuszka D, Ratajczak E, Timonen RS. Kinetics of the Reactions of CH2I, CH2Br, and CHBrCl Radicals with NO2 in the Temperature Range 220−360 K. J Phys Chem A 2006; 110:12177-83. [PMID: 17078613 DOI: 10.1021/jp064197e] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The kinetics of the CH2I + NO2, CH2Br + NO2, and CHBrCl + NO2 reactions have been studied at temperatures between 220 and 360 K using laser photolysis/photoionization mass spectrometry. Decays of radical concentrations have been monitored in time-resolved measurements to obtain reaction rate coefficients under pseudo-first-order conditions. The bimolecular rate coefficients of all three reactions are independent of the bath gas (He or N2) and pressure within the experimental range (2-6 Torr) and are found to depend on temperature as follows: k(CH2I + NO2) = (2.18 +/- 0.07) x 10(-11) (T / 300 K)(-1.45) (+/- 0.22) cm3 molecule(-1) s(-1) (220-363 K), k(CH2Br + NO2) = (1.76 +/- 0.03) x 10(-11) (T/300 K)(-0.86) (+/- 0.09) cm3 molecule(-1) s(-1) (221-363 K), and k(CHBrCl + NO2) = (8.81 +/- 0.28) x 10(-12) (T/300 K)(-1.55) (+/- 0.34) cm3 molecule(-1) s(-1) (267-363 K), with the uncertainties given as one-standard deviations. Estimated overall uncertainties in the measured bimolecular reaction rate coefficients are about +/-25%. In the CH2I + NO2 and CH2Br + NO2 reactions, the observed product is formaldehyde. For the CHBrCl + NO2 reaction, the product observed is CHClO. In addition, I atom and iodonitromethane (CH2INO2) or iodomethyl nitrite (CH2IONO) formations have been detected for the CH2I + NO2 reaction.
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Affiliation(s)
- Arkke J Eskola
- Laboratory of Physical Chemistry, PO Box 55 (A.I. Virtasen aukio 1), FIN-00014 University of Helsinki, Finland
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Eskola AJ, Wojcik-Pastuszka D, Ratajczak E, Timonen RS. Kinetics of the reactions of CH2Br and CH2I radicals with molecular oxygen at atmospheric temperatures. Phys Chem Chem Phys 2006; 8:1416-24. [PMID: 16633623 DOI: 10.1039/b516291b] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The kinetics of the reactions of CH2Br and CH2I radicals with O2 have been studied in direct measurements using a tubular flow reactor coupled to a photoionization mass spectrometer. The radicals have been homogeneously generated by pulsed laser photolysis of appropriate precursors at 193 or 248 nm. Decays of radical concentrations have been monitored in time-resolved measurements to obtain the reaction rate coefficients under pseudo-first-order conditions with the amount of O2 being in large excess over radical concentrations. No buffer gas density dependence was observed for the CH2I + O2 reaction in the range 0.2-15 x 10(17) cm(-3) of He at 298 K. In this same density range the CH2Br + O2 reaction was obtained to be in the third-body and fall-off area. Measured bimolecular rate coefficient of the CH2I + O2 reaction is found to depend on temperature as k(CH2I + O2)=(1.39 +/- 0.01)x 10(-12)(T/300 K)(-1.55 +/- 0.06) cm3 s(-1)(220-450 K). Obtained primary products of this reaction are I atom and IO radical and the yield of I-atom is significant. The rate coefficient and temperature dependence of the CH2Br + O2 reaction in the third-body region is k(CH2Br + O2+ He)=(1.2 +/- 0.2)x 10(-30)(T/300 K)(-4.8 +/- 0.3) cm6 s(-1)(241-363 K), which was obtained by fitting the complete data set simultaneously to a Troe expression with the F(cent) value of 0.4. Estimated overall uncertainties in the measured reaction rate coefficients are about +/-25%.
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Affiliation(s)
- Arkke J Eskola
- Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014, Finland
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Eskola AJ, Geppert WD, Rissanen MP, Timonen RS, Halonen L. Kinetics of the Reactions of Chlorinated Methyl Radicals (CH2Cl, CHCl2, and CCl3) with NO2 in the Temperature Range 220−360 K. J Phys Chem A 2005; 109:5376-81. [PMID: 16839062 DOI: 10.1021/jp050441a] [Citation(s) in RCA: 19] [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 kinetics of the reactions of chlorinated methyl radicals (CH2Cl, CHCl2, and CCl3) with NO2 have been studied in direct measurements at temperatures between 220 and 360 K using a tubular flow reactor coupled to a photoionization mass spectrometer. The radicals have been homogeneously generated at 193 or 248 nm by pulsed laser photolysis of appropriate precursors. Decays of radical concentrations have been monitored in time-resolved measurements to obtain the reaction rate coefficients under pseudo-first-order conditions with the amount of NO2 being in large excess over radical concentrations. The bimolecular rate coefficients of all three reactions are independent of the bath gas (He or N2) and pressure within the experimental range (1-6 Torr) and are found to depend on temperature as follows: k(CH2Cl + NO2) = (2.16 +/- 0.08) x 10(-11) (T/300 K)(-1.12+/-0.24) cm3 molecule(-1) s(-1) (220-363 K), k(CHCl2 + NO2) = (8.90 +/- 0.16) x 10(-12) (T/300 K)(-1.48+/-0.13) cm3 molecule(-1) s(-1) (220-363 K), and k(CCl3 + NO2) = (3.35 +/- 0.10) x 10(-12) (T/300 K)(-2.2+/-0.4) cm3 molecule(-1) s(-1) (298-363 K), with the uncertainties given as one-standard deviations. Estimated overall uncertainties in the measured bimolecular reaction rate coefficients are about +/-25%. In the reactions CH2Cl + NO2, CHCl2 + NO2, and CCl3 + NO2, the products observed are formaldehyde, CHClO, and phosgene (CCl2O), respectively. In addition, a weak signal for the HCl formation has been detected for the CHCl2 + NO2 reaction.
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Affiliation(s)
- Arkke J Eskola
- Laboratory of Physical Chemistry, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 University of Helsinki, Finland
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Geppert WD, Eskola AJ, Timonen RS, Halonen L. Kinetics of the Reactions of Vinyl (C2H3) and Propargyl (C3H3) Radicals with NO2 in the Temperature Range 220−340 K. J Phys Chem A 2004. [DOI: 10.1021/jp0370167] [Citation(s) in RCA: 25] [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: 11/28/2022]
Affiliation(s)
- Wolf D. Geppert
- Laboratory of Physical Chemistry, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 University of Helsinki, Helsinki, Finland
| | - Arkke J. Eskola
- Laboratory of Physical Chemistry, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 University of Helsinki, Helsinki, Finland
| | - Raimo S. Timonen
- Laboratory of Physical Chemistry, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 University of Helsinki, Helsinki, Finland
| | - Lauri Halonen
- Laboratory of Physical Chemistry, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 University of Helsinki, Helsinki, Finland
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