Product distribution study of the Cl-atom initiated oxidation of ethyl methyl sulfide and diethyl sulfide

摘要

The products formed in the gas-phase reactions of Cl atoms with (CH_3CH_2)_2S and CH_3CH_2SCH_3 have been investigated in a large volume reactor in NOx-free air at atmospheric pressure and (298 ± 2) K using long path "in situ" FTIR spectroscopy for the analysis. HCI, SO_2 and CH3CHO were identified as the major products for both reactions. For the Cl + CH_3CH_2SCH_3 reaction HCHO was also identified as a major product. The yields of the products obtained for the reaction of Cl with (CH_3CH_2)_2S were (59 ± 2) %, (52 ± 5) % and (103 ± 4) % for HO, SO_2 and CH_3CHO, respectively. For the reaction of Cl with CH_3CH_2SCH_3 yields of (43 ± 5) %, (55 ± 3) %, (58 ± 3) % and (53 ± 5) % were obtained for HCI, SO_2, CH_3CHO and HCHO, respectively. This is the first products and mechanistic study for the gas-phase Cl-initiated oxidation of non-CH_3SCH_3 alkyl sulfides. Comparison with previous results for the reaction of Cl with dimethyl sulfide is made and simple atmospheric degradation mechanisms are postulated to explain the formation of the observed products.