Atmos. Chem. Phys. Discuss., 10, 12309-12339, 2010
www.atmos-chem-phys-discuss.net/10/12309/2010/
doi:10.5194/acpd-10-12309-2010
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Heterogeneous reactions of carbonyl sulfide on mineral oxides: mechanism and kinetics study
Y. Liu, J. Ma, and H. He
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China

Abstract. The heterogeneous reactions of carbonyl sulfide (OCS) on the typical mineral oxides in the mineral dust particles were investigated using a Knudsen cell flow reactor and an in situ diffuse reflectance UV-vis spectroscopy. The reaction pathway for OCS on mineral dust was identified based on the gaseous products and surface species. The hydrolysis of OCS, and succeeding oxidation of intermediate products, readily take place on α-Al2O3, MgO, and CaO. The reversible and irreversible adsorption of OCS on α-Fe2O3 and ZnO were observed, respectively. No uptake of OCS by SiO2 and TiO2 was observed. The uptake coefficient (γBET) of mineral dust was estimated to be from 3.84×10−7 to 2.86×10−8 based on the individual uptake coefficients and chemical composition of authentic mineral dust. The global flux of OCS due to heterogeneous reactions and adsorption on mineral dust was estimated at 0.13–0.29 Tg yr−1, which is comparable to the annual flux of OCS for its reaction with ·OH.

Citation: Liu, Y., Ma, J., and He, H.: Heterogeneous reactions of carbonyl sulfide on mineral oxides: mechanism and kinetics study, Atmos. Chem. Phys. Discuss., 10, 12309-12339, doi:10.5194/acpd-10-12309-2010, 2010.
 
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