Kinetics of the Toluene Reaction with OH Radical
We calculated the kinetics of chemical activation reactions of toluene with hydroxyl radical in the temperature range from 213 K to 2500 K and the pressure range from 10 Torr to the high-pressure limit by using multistructural variational transition state theory with the small-curvature tunneling ap...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Association for the Advancement of Science (AAAS)
2019-01-01
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| Series: | Research |
| Online Access: | http://dx.doi.org/10.34133/2019/5373785 |
| _version_ | 1827333543624179712 |
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| author | Rui Ming Zhang Donald G. Truhlar Xuefei Xu |
| author_facet | Rui Ming Zhang Donald G. Truhlar Xuefei Xu |
| author_sort | Rui Ming Zhang |
| collection | DOAJ |
| description | We calculated the kinetics of chemical activation reactions of toluene with hydroxyl radical in the temperature range from 213 K to 2500 K and the pressure range from 10 Torr to the high-pressure limit by using multistructural variational transition state theory with the small-curvature tunneling approximation (MS-CVT/SCT) and using the system-specific quantum Rice-Ramsperger-Kassel method. The reactions of OH with toluene are important elementary steps in both combustion and atmospheric chemistry, and thus it is valuable to understand the rate constants both in the high-pressure, high-temperature regime and in the low-pressure, low-temperature regime. Under the experimental pressure conditions, the theoretically calculated total reaction rate constants agree well with the limited experimental data, including the negative temperature dependence at low temperature. We find that the effect of multistructural anharmonicity on the partition functions usually increases with temperature, and it can change the calculated reaction rates by factors as small as 0.2 and as large as 4.2. We also find a large effect of anharmonicity on the zero-point energies of the transition states for the abstraction reactions. We report that abstraction of H from methyl should not be neglected in atmospheric chemistry, even though the low-temperature results are dominated by addition. We calculated the product distribution, which is usually not accessible to experiments, as a function of temperature and pressure. |
| first_indexed | 2024-03-07T17:28:55Z |
| format | Article |
| id | doaj.art-27aa33b3604b4587a3578b4957a6e595 |
| institution | Directory Open Access Journal |
| issn | 2639-5274 |
| language | English |
| last_indexed | 2024-03-07T17:28:55Z |
| publishDate | 2019-01-01 |
| publisher | American Association for the Advancement of Science (AAAS) |
| record_format | Article |
| series | Research |
| spelling | doaj.art-27aa33b3604b4587a3578b4957a6e5952024-03-02T18:34:41ZengAmerican Association for the Advancement of Science (AAAS)Research2639-52742019-01-01201910.34133/2019/5373785Kinetics of the Toluene Reaction with OH RadicalRui Ming Zhang0Donald G. Truhlar1Xuefei Xu2Center for Combustion Energy, Department of Energy and Power Engineering, and Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, ChinaDepartment of Chemistry, Chemical Theory Center, and Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455-0431, USACenter for Combustion Energy, Department of Energy and Power Engineering, and Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, ChinaWe calculated the kinetics of chemical activation reactions of toluene with hydroxyl radical in the temperature range from 213 K to 2500 K and the pressure range from 10 Torr to the high-pressure limit by using multistructural variational transition state theory with the small-curvature tunneling approximation (MS-CVT/SCT) and using the system-specific quantum Rice-Ramsperger-Kassel method. The reactions of OH with toluene are important elementary steps in both combustion and atmospheric chemistry, and thus it is valuable to understand the rate constants both in the high-pressure, high-temperature regime and in the low-pressure, low-temperature regime. Under the experimental pressure conditions, the theoretically calculated total reaction rate constants agree well with the limited experimental data, including the negative temperature dependence at low temperature. We find that the effect of multistructural anharmonicity on the partition functions usually increases with temperature, and it can change the calculated reaction rates by factors as small as 0.2 and as large as 4.2. We also find a large effect of anharmonicity on the zero-point energies of the transition states for the abstraction reactions. We report that abstraction of H from methyl should not be neglected in atmospheric chemistry, even though the low-temperature results are dominated by addition. We calculated the product distribution, which is usually not accessible to experiments, as a function of temperature and pressure.http://dx.doi.org/10.34133/2019/5373785 |
| spellingShingle | Rui Ming Zhang Donald G. Truhlar Xuefei Xu Kinetics of the Toluene Reaction with OH Radical Research |
| title | Kinetics of the Toluene Reaction with OH Radical |
| title_full | Kinetics of the Toluene Reaction with OH Radical |
| title_fullStr | Kinetics of the Toluene Reaction with OH Radical |
| title_full_unstemmed | Kinetics of the Toluene Reaction with OH Radical |
| title_short | Kinetics of the Toluene Reaction with OH Radical |
| title_sort | kinetics of the toluene reaction with oh radical |
| url | http://dx.doi.org/10.34133/2019/5373785 |
| work_keys_str_mv | AT ruimingzhang kineticsofthetoluenereactionwithohradical AT donaldgtruhlar kineticsofthetoluenereactionwithohradical AT xuefeixu kineticsofthetoluenereactionwithohradical |