The mechanism of SO2 oxidation by CH3O2 radicals. Rate coefficients for the reactions of CH3O2 with SO2 and NO |
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Authors: | R. Simonaitis J. Heicklen |
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Affiliation: | Department of Chemistry and Ionosphere Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802, USA |
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Abstract: | The reactions of CH3O2 with SO2 and NO have been studied by steady state photolysis of azomethane in the presence of O2SO2→NO mixtures at 296 K and 1 atm total pressure. The quantum yield of NO oxidation by CH3O2 radicals is increased substantially when SO2 is added to the system indicating an SO2 induced chain oxidation of NO. The rate law gives k1/k2 = (2.5 ± 0.5) × 10?3 for CH3O2 + SO2 → CH3O2SO2 (1), CH3O2 + NO → CH3O + NO2 (2). Combining this ratio with the absolute value of k1 = 8.2 × 10?15 cm3 s?1 gives k2 = 10?11.5 ± 02 cm3 s?1. |
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