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Blitz MA, Onel L, Robertson SH, Seakins PW. Studies on the Kinetics of the CH + H 2 Reaction and Implications for the Reverse Reaction, 3CH 2 + H. J Phys Chem A 2023; 127:2367-2375. [PMID: 36857400 PMCID: PMC10026075 DOI: 10.1021/acs.jpca.2c08097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
The reaction of CH radicals with H2 has been studied by the use of laser flash photolysis, probing CH decays under pseudo-first-order conditions using laser-induced fluorescence (LIF) over the temperature range 298-748 K at pressures of ∼5-100 Torr. Careful data analysis was required to separate the CH LIF signal at ∼428 nm from broad background fluorescence, and this interference increased with temperature. We believe that this interference may have been the source of anomalous pressure behavior reported previously in the literature (Brownsword, R. A.; J. Chem. Phys. 1997, 106, 7662-7677). The rate coefficient k1 shows complex behavior: at low pressures, the main route for the CH3* formed from the insertion of CH into H2 is the formation of 3CH2 + H, and as the pressure is increased, CH3* is increasingly stabilized to CH3. The kinetic data on CH + H2 have been combined with experimental shock tube data on methyl decomposition and literature thermochemistry within a master equation program to precisely determine the rate coefficient of the reverse reaction, 3CH2 + H → CH + H2. The resulting parametrization is kCH2+H(T) = (1.69 ± 0.11) × 10-10 × (T/298 K)(0.05±0.010) cm3 molecule-1 s-1, where the errors are 1σ.
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Affiliation(s)
- Mark A Blitz
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
- NCAS, University of Leeds, Leeds LS2 9JT, U.K
| | - Lavinia Onel
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
| | | | - Paul W Seakins
- School of Chemistry, University of Leeds, Leeds LS2 9JT, U.K
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2
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Lin K, Dmitriev AM, Sun W, Shmakov AG, Knyazkov DA, Yang B. Improving the Predictive Accuracy for Ketene in Diacetyl Laminar Premixed Flames: Experiment and Model Analysis. J Phys Chem A 2022; 126:9475-9484. [DOI: 10.1021/acs.jpca.2c06628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Keli Lin
- Center for Combustion Energy and Department of Energy and Power Engineering, Tsinghua University, Beijing100084, P.R. China
| | - Artëm M. Dmitriev
- Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, Novosibirsk630090, Russia
| | - Wenyu Sun
- Center for Combustion Energy and Department of Energy and Power Engineering, Tsinghua University, Beijing100084, P.R. China
| | - Andrey G. Shmakov
- Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, Novosibirsk630090, Russia
| | - Denis A. Knyazkov
- Voevodsky Institute of Chemical Kinetics and Combustion SB RAS, Novosibirsk630090, Russia
| | - Bin Yang
- Center for Combustion Energy and Department of Energy and Power Engineering, Tsinghua University, Beijing100084, P.R. China
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3
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Xu B, Garrec J, Nicolle A, Matrat M, Catoire L. Temperature and Pressure Dependent Rate Coefficients for the Reaction of Ketene with Hydroxyl Radical. J Phys Chem A 2019; 123:2483-2496. [PMID: 30852895 DOI: 10.1021/acs.jpca.8b11273] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reaction of ketene with hydroxyl radical is drawing growing attention, for it is found to constitute an important step during the combustion of hydrocarbon and oxygenated hydrocarbon fuels, e.g., acetylene, propyne, allene, acetone, gasoline, diesel, jet fuels, and biofuels. We studied the potential energy surface (PES) of this reaction using B2PLYP-D3/cc-PVTZ for geometry optimization and composite methods based on CCSD(T)-F12/cc-PVTZ-F12 for energy calculations. From this PES, temperature- and pressure-dependent rate coefficients and branching ratios at 200-3000 K and 0.01-100 atm were derived using the RRKM/ME approach. The reaction is dominated by four product channels: (i) OH addition on the olefinic carbon of ketene to form CH2OH + CO, which is the most dominant under all conditions; (ii) H abstraction producing HCCO + H2O, which is favored at high temperatures; (iii) OH addition on the carbonyl carbon to form CH3 + CO2, which is favored at low pressures and high temperatures; and (iv) collisional stabilization of CH2COOH, which is favored at high pressures and low temperatures. With increasing temperatures, the overall rate constant koverall exhibit first negative but then positive temperature dependency, with its switching point (also the minimum point) at ∼400 K. Both product channel CH2OH + CO and HCCO + H2O are independent of pressure, whereas formation of CH3 + CO2 and collisional stabilization of CH2COOH are highly pressure dependent. Fitted modified Arrhenius expressions of the calculated rate constants are provided for the purpose of combustion modeling.
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Affiliation(s)
- Boyang Xu
- Unité Chimie et Procédés (UCP) , ENSTA ParisTech , 828 Boulevard des Maréchaux , 91120 Palaiseau , France
| | - Julian Garrec
- Unité Chimie et Procédés (UCP) , ENSTA ParisTech , 828 Boulevard des Maréchaux , 91120 Palaiseau , France
| | - André Nicolle
- Unité Chimie et Procédés (UCP) , ENSTA ParisTech , 828 Boulevard des Maréchaux , 91120 Palaiseau , France
| | - Mickaël Matrat
- IFP Energies nouvelles (IFPEN) , 1 et 4 avenue de Bois-Préau , 92852 Rueil-Malmaison , France
| | - Laurent Catoire
- Unité Chimie et Procédés (UCP) , ENSTA ParisTech , 828 Boulevard des Maréchaux , 91120 Palaiseau , France
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4
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Savchenkova AS, Semenikhin AS, Chechet IV, Matveev SG, Konnov AA, Mebel AM. Mechanism and rate constants of the CH 2 + CH 2 CO reactions in triplet and singlet states: A theoretical study. J Comput Chem 2019; 40:387-399. [PMID: 30299558 DOI: 10.1002/jcc.25613] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 09/09/2018] [Accepted: 09/10/2018] [Indexed: 11/10/2022]
Abstract
Ab initio and density functional CCSD(T)-F12/cc-pVQZ-f12//B2PLYPD3/6-311G** calculations have been performed to unravel the reaction mechanism of triplet and singlet methylene CH2 with ketene CH2 CO. The computed potential energy diagrams and molecular properties have been then utilized in Rice-Ramsperger-Kassel-Marcus-Master Equation (RRKM-ME) calculations of the reaction rate constants and product branching ratios combined with the use of nonadiabatic transition state theory for spin-forbidden triplet-singlet isomerization. The results indicate that the most important channels of the reaction of ketene with triplet methylene lead to the formation of the HCCO + CH3 and C2 H4 + CO products, where the former channel is preferable at higher temperatures from 1000 K and above. In the C2 H4 + CO product pair, the ethylene molecule can be formed either adiabatically in the triplet electronic state or via triplet-singlet intersystem crossing in the singlet electronic state occurring in the vicinity of the CH2 COCH2 intermediate or along the pathway of CO elimination from the initial CH2 CH2 CO complex. The predominant products of the reaction of ketene with singlet methylene have been shown to be C2 H4 + CO. The formation of these products mostly proceeds via a well-skipping mechanism but at high pressures may to some extent involve collisional stabilization of the CH3 CHCO and cyclic CH2 COCH2 intermediates followed by their thermal unimolecular decomposition. The calculated rate constants at different pressures from 0.01 to 100 atm have been fitted by the modified Arrhenius expressions in the temperature range of 300-3000 K, which are proposed for kinetic modeling of ketene reactions in combustion. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
| | | | - Ivan V Chechet
- Samara National Research University, Samara 443086, Russia
| | | | - Alexander A Konnov
- Division of Combustion Physics, Department of Physics, Lund University, S-221 00, Lund, Sweden
| | - Alexander M Mebel
- Samara National Research University, Samara 443086, Russia.,Department of Chemistry and Biochemistry, Florida International University, Miami, Florida, 33199
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5
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Weber I, Friese P, Olzmann M. H-Atom-Forming Reaction Pathways in the Pyrolysis of Furan, 2-Methylfuran, and 2,5-Dimethylfuran: A Shock-Tube and Modeling Study. J Phys Chem A 2018; 122:6500-6508. [DOI: 10.1021/acs.jpca.8b05346] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Isabelle Weber
- Institut für Physikalische Chemie, Karlsruher Institut für Technologie (KIT), Kaiserstrasse 12, 76131 Karlsruhe, Germany
| | - Philipp Friese
- Institut für Physikalische Chemie, Karlsruher Institut für Technologie (KIT), Kaiserstrasse 12, 76131 Karlsruhe, Germany
| | - Matthias Olzmann
- Institut für Physikalische Chemie, Karlsruher Institut für Technologie (KIT), Kaiserstrasse 12, 76131 Karlsruhe, Germany
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Semenikhin AS, Shubina EG, Savchenkova AS, Chechet IV, Matveev SG, Konnov AA, Mebel AM. Mechanism and Rate Constants of the CH3
+ CH2
CO Reaction: A Theoretical Study. INT J CHEM KINET 2018. [DOI: 10.1002/kin.21156] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | - E. G. Shubina
- Samara National Research University; Samara 443086 Russia
| | | | - I. V. Chechet
- Samara National Research University; Samara 443086 Russia
| | - S. G. Matveev
- Samara National Research University; Samara 443086 Russia
| | - A. A. Konnov
- Division of Combustion Physics; Department of Physics; Lund University; S-221 00 Lund Sweden
| | - A. M. Mebel
- Samara National Research University; Samara 443086 Russia
- Department of Chemistry and Biochemistry; Florida International University; Miami FL 33199
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Aoyagi M, Shepard R, Wagner AF. An Ab Initio Theoretical Study of the CH + H2 ⇌ Ch3 * ⇌ Ch2 + H Reactions. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/109434209100500105] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Ab initio calculations of the electronic wave function and associated potential energy of CH 3 at geometries appro priate for the title reaction described here allow charac terization of the reactants and the energetically most fa vorable routes that are followed during the reaction. The quantum mechanical description of the electronic mo tion at each molecular geometry involves the response of each electron to the average field of all other elec trons and the approximate correlated response of each electron to the instantaneous position of the other elec trons. The basic methodology for the computation of this wave function, using extensive orbital basis sets and large-scale configuration expansions, is described. This calculation is one of the largest ever attempted for the characterization of a polyatomic reaction path. However, the path description involves a fine balance of energy contributions that requires this level of sophistication. The calculated properties of the reactants, the interme diate CH3, and the reaction paths to form CH3 are pre sented. The computed energetics compare favorably to experimental results.
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Affiliation(s)
| | - Ron Shepard
- ARGONNE NATIONAL LABORATORY ARGONNE, ILLINOIS 60439
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8
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Agafonov GL, Tereza AM. Autoignition of propane behind shock waves. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2015. [DOI: 10.1134/s1990793115010145] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Annesley CJ, Franklin Goldsmith C, Tranter RS. A shock tube laser schlieren study of methyl acetate dissociation in the fall-off regime. Phys Chem Chem Phys 2014; 16:7241-50. [DOI: 10.1039/c3cp55297g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Lee PF, Matsui H, Wang NS. Study on the Reaction of CH2 with H2 at High Temperature. J Phys Chem A 2012; 116:1891-6. [DOI: 10.1021/jp211849h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pei-Fang Lee
- Department
of Applied Chemistry, National Chiao Tung University, 1001,
Ta Hsueh Road, Hsinchu 30010, Taiwan
| | - Hiroyuki Matsui
- Department
of Applied Chemistry, National Chiao Tung University, 1001,
Ta Hsueh Road, Hsinchu 30010, Taiwan
| | - Niann-Shiah Wang
- Department
of Applied Chemistry, National Chiao Tung University, 1001,
Ta Hsueh Road, Hsinchu 30010, Taiwan
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11
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Yang X, Jasper AW, Giri BR, Kiefer JH, Tranter RS. A shock tube and theoretical study on the pyrolysis of 1,4-dioxane. Phys Chem Chem Phys 2011; 13:3686-700. [DOI: 10.1039/c0cp01541e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Tereza AM, Slutskii VG, Severin ES. Autoignition of ethylene in shock waves. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2010. [DOI: 10.1134/s1990793110030176] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Bauerle S, Klatt M, Wagner HGG. Recombination and Decomposition of Methylene Radicals at high Temperatures. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19950990612] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Dombrowsky C, Hwang SM, Röhrig M, Gg. Wagner H. The Formation of O and H Atoms in the Reaction of CH2 with O2 at High Temperatures. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19920960215] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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15
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Karasevich YK. Kinetics of chemical ionization in shock waves: IV. Kinetic model of ionization in acetylene oxidation. KINETICS AND CATALYSIS 2009. [DOI: 10.1134/s0023158409050024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Yang X, Jasper AW, Kiefer JH, Tranter RS. The Dissociation of Diacetyl: A Shock Tube and Theoretical Study. J Phys Chem A 2009; 113:8318-26. [DOI: 10.1021/jp903716f] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xueliang Yang
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, Combustion Research Facility, Sandia National Laboratory, P.O. Box 969, Livermore, California 94551, and Department of Chemical Engineering, University of Illinois at Chicago, 810 South Clinton Street, Chicago, Illinois 60607
| | - Ahren W. Jasper
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, Combustion Research Facility, Sandia National Laboratory, P.O. Box 969, Livermore, California 94551, and Department of Chemical Engineering, University of Illinois at Chicago, 810 South Clinton Street, Chicago, Illinois 60607
| | - John H. Kiefer
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, Combustion Research Facility, Sandia National Laboratory, P.O. Box 969, Livermore, California 94551, and Department of Chemical Engineering, University of Illinois at Chicago, 810 South Clinton Street, Chicago, Illinois 60607
| | - Robert S. Tranter
- Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, Combustion Research Facility, Sandia National Laboratory, P.O. Box 969, Livermore, California 94551, and Department of Chemical Engineering, University of Illinois at Chicago, 810 South Clinton Street, Chicago, Illinois 60607
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17
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Karasevich YK. Kinetics of chemical ionization in shock waves: II. Kinetic model of ionization in methane oxidation. KINETICS AND CATALYSIS 2009. [DOI: 10.1134/s0023158409010108] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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18
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Tereza AM, Slutskii VG, Severin ES. Ignition of acetylene-oxygen mixtures behind shock waves. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2009. [DOI: 10.1134/s1990793109010163] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Vasudevan V, Hanson RK, Bowman CT, Golden DM, Davidson DF. Shock tube study of the reaction of CH with N2: overall rate and branching ratio. J Phys Chem A 2007; 111:11818-30. [PMID: 17958405 DOI: 10.1021/jp075638c] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have studied the reaction between CH and N2, (1) CH + N2 --> products, in shock tube experiments using CH and NCN laser absorption. CH was monitored by continuous-wave, narrow-line-width laser absorption at 431.1 nm. The overall rate coefficient of the CH + N2 reaction was measured between 1943 and 3543 K, in the 0.9-1.4 atm pressure range, using a CH perturbation approach. CH profiles recorded upon shock-heating dilute mixtures of ethane in argon and acetic anhydride in argon were perturbed by the addition of nitrogen. The perturbation in the CH concentration was principally due to the reaction between CH and N2. Rate coefficients for the overall reaction were inferred by kinetically modeling the perturbed CH profiles. A least-squares, two-parameter fit of the current overall rate coefficient measurements was k1 = 6.03 x 1012 exp(-11150/T [K]) (cm3 mol-1 s-1). The uncertainty in k1 was estimated to be approximately +/-25% and approximately +/-35% at approximately 3350 and approximately 2100 K, respectively. At high temperatures, there are two possible product channels for the reaction between CH and N2, (1a) CH + N2 --> HCN + N and (1b) CH + N2 --> H + NCN. The large difference in the rates of the reverse reactions enabled inference of the branching ratio of reaction 1, k1b/(k1b + k1a), in the 2228-2905 K temperature range by CH laser absorption in experiments in a nitrogen bath. The current CH measurements are consistent with a branching ratio of 1 and establish NCN and H as the primary products of the CH + N2 reaction. A detailed and systematic uncertainty analysis, taking into account experimental and mechanism-induced contributions, yields a conservative lower bound of 0.70 for the branching ratio. NCN was also detected by continuous-wave, narrow-line-width laser absorption at 329.13 nm. The measured NCN time histories were used to infer the rate coefficient of the reaction between H and NCN, H + NCN --> HCN + N, and to estimate an absorption coefficient for the NCN radical.
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Affiliation(s)
- Venkatesh Vasudevan
- High Temperature Gasdynamics Laboratory, Mechanical Engineering Department, Stanford University, Stanford, California 94305, USA.
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20
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Jasper AW, Klippenstein SJ, Harding LB. Secondary Kinetics of Methanol Decomposition: Theoretical Rate Coefficients for 3CH2 + OH, 3CH2 + 3CH2, and 3CH2 + CH3. J Phys Chem A 2007; 111:8699-707. [PMID: 17696414 DOI: 10.1021/jp0736950] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Direct variable reaction coordinate transition state theory (VRC-TST) rate coefficients are reported for the (3)CH(2) + OH, (3)CH(2) + (3)CH(2), and (3)CH(2) + CH(3) barrierless association reactions. The predicted rate coefficient for the (3)CH(2) + OH reaction (approximately 1.2 x 10(-10) cm(3) molecule(-1) s(-1) for 300-2500 K) is 4-5 times larger than previous estimates, indicating that this reaction may be an important sink for OH in many combustion systems. The predicted rate coefficients for the (3)CH(2) + CH(3) and (3)CH(2) + (3)CH(2) reactions are found to be in good agreement with the range of available experimental measurements. Product branching in the self-reaction of methylene is discussed, and the C(2)H(2) + 2H and C(2)H(2) + H2 products are predicted in a ratio of 4:1. The effect of the present set of rate coefficients on modeling the secondary kinetics of methanol decomposition is briefly considered. Finally, the present set of rate coefficients, along with previous VRC-TST determinations of the rate coefficients for the self-reactions of CH(3) and OH and for the CH(3) + OH reaction, are used to test the geometric mean rule for the CH(3), (3)CH(2), and OH fragments. The geometric mean rule is found to predict the cross-combination rate coefficients for the (3)CH(2) + OH and (3)CH(2) + CH(3) reactions to better than 20%, with a larger (up to 50%) error for the CH(3) + OH reaction.
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Affiliation(s)
- Ahren W Jasper
- Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
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Yasunaga K, Kubo S, Hoshikawa H, Kamesawa T, Hidaka Y. Shock-tube and modeling study of acetaldehyde pyrolysis and oxidation. INT J CHEM KINET 2007. [DOI: 10.1002/kin.20294] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Joshi A, You X, Barckholtz TA, Wang H. Thermal Decomposition of Ethylene Oxide: Potential Energy Surface, Master Equation Analysis, and Detailed Kinetic Modeling. J Phys Chem A 2005; 109:8016-27. [PMID: 16834184 DOI: 10.1021/jp0516442] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The unimolecular decomposition of ethylene oxide (oxirane) and the oxiranyl radial is examined by molecular orbital calculations, Rice-Ramsperger-Kassel-Marcus (RRKM)/Master Equation analysis, and detailed kinetic modeling of ethylene oxide pyrolysis in a single-pulse shock tube. It was found that the largest energy barrier to the decomposition of ethylene oxide lies in its initial isomerization to form acetaldehyde, and in agreement with previous studies, the isomerization was found to proceed through the *CH2CH2O* biradical. Because of the biradical nature of the transition states and intermediate, the energy barriers for the initial C-O rupture in ethylene oxide and the subsequent 1,2-H shift remain highly uncertain. An overall isomerization energy barrier of 59 +/- 2 kcal/mol was found to satisfactorily explain the available single pulse shock tube data. This barrier height is in line with the estimates made from an approximate spin-corrected procedure at the MP4/6-31+G(d) and QCISD(T)/6-31G(d) levels of theory. The dominant channel for the unimolecular decomposition of ethylene oxide was found to form CH3 + HCO at around the ambient pressure. It accounts for >90% of the total rate constant for T > 800 K. The high-pressure limit rate constant for the unimolecular decomposition of ethylene oxide was calculated as k(1,infinity)(s(-1)) = (3.74 x 10(10))T(1.298)e(-29990/T) for 600 < T < 2000 K.
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Affiliation(s)
- Ameya Joshi
- Department of Mechanical Engineering, University of Delaware, Newark, Delaware 19711, USA
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23
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Krasnoperov LN, Michael JV. High-Temperature Shock Tube Studies Using Multipass Absorption: Rate Constant Results for OH + CH3, OH + CH2, and the Dissociation of CH3OH. J Phys Chem A 2004. [DOI: 10.1021/jp040343+] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Rajakumar B, Reddy KPJ, Arunan E. Thermal Decomposition of 2-Fluoroethanol: Single Pulse Shock Tube and ab Initio Studies. J Phys Chem A 2003. [DOI: 10.1021/jp027323x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- B. Rajakumar
- Department of Inorganic and Physical Chemistry and Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560012, India
| | - K. P. J. Reddy
- Department of Inorganic and Physical Chemistry and Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560012, India
| | - E. Arunan
- Department of Inorganic and Physical Chemistry and Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560012, India
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25
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Lee J, Bozzelli JW. Reaction of H + ketene to formyl methyl and acetyl radicals and reverse dissociations. INT J CHEM KINET 2002. [DOI: 10.1002/kin.10103] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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26
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Fincke JR, Anderson RP, Hyde TA, Detering BA. Plasma Pyrolysis of Methane to Hydrogen and Carbon Black. Ind Eng Chem Res 2002. [DOI: 10.1021/ie010722e] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
Using frequency modulation (FM) spectroscopy singlet methylene radicals have been detected for the first time behind shock waves. The thermal decomposition of ketene served as source for metylene radicals at temperatures from 1905 to 2780 K and pressures around 450 mbar. For the unimolecular decomposition reaction, (1) CHAs a first study of a methylene reaction at high temperatures by diretly tracing methylene the reaction of methylene with hydrogen, (8 + 9)log(A comparison with low temperature literature data and the systematics of activation energies of triplet methylene reactions allowed a consistent description of singlet and triplet contributions and of the forward and reverse reaction.
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Perry JJ, Kim YH, Fox JL, Porter HS. Chemistry of the Jovian auroral ionosphere. ACTA ACUST UNITED AC 1999. [DOI: 10.1029/1999je900022] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Vereecken L, Pierloot K, Peeters J. B3LYP-DFT characterization of the potential energy surface of the CH(X 2Π)+C2H2 reaction. J Chem Phys 1998. [DOI: 10.1063/1.475345] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Quantitative laser-based measurements and detailed chemical kinetic modeling of nitric oxide concentrations in methane-air counterflow diffusion flames. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0082-0784(98)80546-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Absolute radical concentration measurements and modeling of low-pressure CH4/O2/NO flames. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0082-0784(98)80436-0] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Hranisavljevic J, Kumaran S, Michael J. H+CH2CO→CH3+CO at high temperature: A high pressure chemical activation reaction with positive barrier. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0082-0784(98)80401-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Fulle D, Hippler H. The temperature and pressure dependence of the reaction CH+H2⇔CH3⇔CH2+H. J Chem Phys 1997. [DOI: 10.1063/1.473930] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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R�hrig M, Petersen EL, Davidson DF, Hanson RK, Bowman CT. Measurement of the rate coefficient of the reaction CH+O2 ? products in the temperature range 2200 to 2600 K. INT J CHEM KINET 1997. [DOI: 10.1002/(sici)1097-4601(1997)29:10<781::aid-kin7>3.0.co;2-i] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Su JZ, Teitelbaum H. The rate of methyl radical decomposition at high temperatures and pressures. INT J CHEM KINET 1994. [DOI: 10.1002/kin.550260116] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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37
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Markus M, Roth P, Tereza A. Thermal decomposition of CH2 verified by product concentration measurements of C, H, and CH. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/s0082-0784(06)80702-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Allen M, Yung YL, Gladstone GR. The relative abundance of ethane to acetylene in the Jovian stratosphere. ICARUS 1992; 100:527-533. [PMID: 11538055 DOI: 10.1016/0019-1035(92)90115-n] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The observed ratio of C2H6 to C2H2 in the Jovian stratosphere increases from approximately 55 at 2 mbar to approximately 277 at 12 mbar. In current photochemical models this ratio typically increases between 2 and 12 mbar by a factor of < or = 3. Recent laboratory kinetics studies on the reaction between C2H3 and H2 to form C2H4 suggest an efficient chemical mechanism for hydrogenation of C2H2 to C2H6. Inclusion of this scheme as part of a comprehensive updated model for hydrocarbon photochemistry in the atmosphere of Jupiter provides an explanation of the altitude variation of the C2H6/C2H2 ratio. The sensitivity of these results to uncertainties in the key rate constants at low temperatures is illustrated, identifying needs for additional laboratory measurements. Since the key reaction rate constants decrease with decreasing temperature, the hydrogenation of C2H2 as proposed predicts a qualitatively decreasing trend in the C2H6/C2H2 value with decreasing distance from the Sun. The observed variation between Jupiter and Saturn is consistent with this prediction.
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Affiliation(s)
- M Allen
- Earth and Space Sciences Division, California Institute of Technology, Pasadena 91109
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Dean AJ, Hanson RK. CH and C-atom time histories in dilute hydrocarbon pyrolysis: Measurements and kinetics calculations. INT J CHEM KINET 1992. [DOI: 10.1002/kin.550240602] [Citation(s) in RCA: 57] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
40
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Norton TS, Dryer FL. An experimental and modeling study of ethanol oxidation kinetics in an atmospheric pressure flow reactor. INT J CHEM KINET 1992. [DOI: 10.1002/kin.550240403] [Citation(s) in RCA: 85] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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41
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Dagaut P, Boettner JC, Cathonnet M. Ethylene pyrolysis and oxidation: A kinetic modeling study. INT J CHEM KINET 1990. [DOI: 10.1002/kin.550220608] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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42
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Frank P, Bhaskaran K, Just T. Acetylene oxidation: The reaction C2H2+O at high temperatures. ACTA ACUST UNITED AC 1988. [DOI: 10.1016/s0082-0784(88)80320-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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43
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Thorne LR, Branch MC, Chandler DW, Kee RJ, Miller JA. Hydrocarbon/nitric oxide interactions in low-pressure flames. ACTA ACUST UNITED AC 1988. [DOI: 10.1016/s0082-0784(88)80328-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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44
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Kohse-Höinghaus K, Kelm S, Meier U, Bittner J, Just T. Concentration Profiles of Flame Radicals Determined by Laser-Induced Fluorescence. ACTA ACUST UNITED AC 1987. [DOI: 10.1007/978-3-642-83224-6_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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45
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Zabarnick S, Fleming JW, Lin MC. Kinetic study of the reaction CH(X 2Π)+H2⇄CH2(X 3B1)+H in the temperature range 372 to 675 K. J Chem Phys 1986. [DOI: 10.1063/1.451808] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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