Gas-Phase Oxidation of SO2 in the Ozone-Olefin Reactions

Article abstract of DOI:10.1021/j150664a058

Gas-phase oxidation of SO2 in the ozone-olefin reactions was studided, and the yield of sulfuric acid aerosol was determined for various types of olefins under atmospheric pressure.No sulfur-containing compounds other than sulfuric acid was detected.Pressure dependence of the yield of H2SO4 was studied for the first time for trans-2-butene.The yield decreased to zero as the total pressure of air was decreased.This fact supports the contention that only a stabilized Criegee intermediate can undergo bimolecular reactions.Stabilized fractions of CH2OO and CH3CHOO in the ozone reaction of ethylene and trans-2-butene under atmospheric pressure are 0.390 +/- 0.053 and 0.185 +/- 0.028, respectively.The yield of H2SO4 was a low as 0.052 +/- 0.013, 0.032 +/- 0.024, and 0.029 +/- 0.015 for cyclopentene, cyclohexene, and cycloheptene, respectively.The yield of H2SO4 for α- and β-pinene was 0.125 +/- 0.040 and 0.249 +/- 0.024, respectively.The rate constant ratio of decomposition of the initially formed hot Criegee intermediate to its collisional stabilization was obtained to be (3.9 +/- 0.8) x 1E18 molecules/cm³ for trans-2-butene.