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| Titel |
Heterogeneous reactions of carbonyl sulfide on mineral oxides: mechanism and kinetics study |
| VerfasserIn |
Y. Liu, J. Ma, H. He |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 21 ; Nr. 10, no. 21 (2010-11-04), S.10335-10344 |
| Datensatznummer |
250008870
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| Publikation (Nr.) |
 copernicus.org/acp-10-10335-2010.pdf |
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| Zusammenfassung |
| 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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