Direct Kinetic and Atmospheric Modelling Studies of Criegee Intermediate Reactions with Acetone
| Autor: | M. Anwar H. Khan, Carl J. Percival, Andrew J. Orr-Ewing, Zachary J. Buras, Dudley E. Shallcross, Rabi Chhantyal-Pun, Nicholas Zachhuber, Rebecca Martin |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Atmospheric Science
atmospheric chemistry Radical reaction rates acetone 02 engineering and technology Atmospheric model 010402 general chemistry 021001 nanoscience & nanotechnology Kinetic energy Photochemistry 01 natural sciences Redox 0104 chemical sciences Reaction rate chemistry.chemical_compound chemistry Space and Planetary Science Geochemistry and Petrology Criegee intermediate Atmospheric chemistry Acetone Criegee intermediates 0210 nano-technology global modelling |
| Zdroj: | Chhantyal-Pun, R, Khan, M A H, Martin, R, Zachhuber, N, Buras, Z J, Percival, C J, Shallcross, D E & Orr-Ewing, A J 2019, ' Direct Kinetic and Atmospheric Modelling Studies of Criegee Intermediate Reactions with Acetone ', ACS Earth and Space Chemistry, vol. 3, no. 10, pp. 2363-2371 . https://doi.org/10.1021/acsearthspacechem.9b00213 |
| Popis: | Mounting evidence suggests that Criegee intermediates are important tropospheric oxidants of both organic and inorganic gases, supplementing the oxidation chemistry initiated by OH radicals. Here, the rate coefficient for reaction of the simplest Criegee intermediate CH2OO with acetone, k(CH2OO + (CH3)2CO), was measured using laser flash photolysis and cavity ring-down spectroscopy methods under tropospherically relevant conditions of pressure and temperature. The pressure dependence of k(CH2OO + (CH3)2CO)= (4.7 ± 0.1) x 10-13 [N2] / ((3.7 ± 0.7) x 1016 + [N2]) cm3 molecule-1 s-1 was measured in the 5 to 100 Torr range, returning a high-pressure limit value of (4.7 ± 0.1) x 10-13 cm3 molecule-1 s-1 at 293 K. A temperature dependence of k(CH2OO + (CH3)2CO) = (1.45 ± 0.18) x 10-21 T2 exp (2407 ± 36 / T) cm3 molecule-1 s-1 was observed in the 250 to 310 K range. The global chemical transport model (STOCHEM-CRI) was used to model the speciated Criegee intermediate field using recently reported temperature dependent rate coefficient values for various reactions of Criegee intermediates. Incorporation of the Criegee intermediate reaction with acetone in the model predicts decreases in acetone concentration of as much as 10 to 40 ppt in various regions of the world. |
| Databáze: | OpenAIRE |
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