References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-10-10335-2010

Heterogeneous reactions of carbonyl sulfide on mineral oxides: mechanism and kinetics study

Liu

¹ Ma

¹ He

State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China

04 11 2010

10 21 10335 10344

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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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 a 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 took place on α-Al2O3, MgO, and CaO. Reversible and irreversible adsorption of OCS were observed on α-Fe2O3 and ZnO, respectively, whereas no apparent uptake of OCS by SiO2 and TiO2 was observed. The reactivity of OCS on these oxides depends on both the basicity of oxides and the decomposition reactivity of oxides for H2S. Based on the individual uptake coefficients and chemical composition of authentic mineral dust, the uptake coefficient (γBET) of mineral dust was estimated to be in the range of 3.84×10−7–2.86×10−8. 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.

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