Abstract
Photooxidation of carbonyl sulfide (COS) under UV irradiation and the role of the oxides such as SiO 2 , Al 2 O 3 and Fe 2 O 3 were investigated by in situ FTIR in a long optical path cell. The major products were identified as SO 2 and CO 2 by means of IR spectra and GC-MS. SO 2 was partially oxidized into SO 4 2- on the surface of the oxides and interior wall of the reactor, which was determined by XPS. The photooxidation is pseudo first order with respect to COS, and the apparent rate constant is approximately 9.30×10 -4 ·s -1 . SiO 2 and Al 2 O 3 promote the photooxidation of COS significantly, but Fe 2 O 3 has no obvious influence on the reaction. The reaction rates in the presence of the oxides or not, rank as: UV+SiO 2 >UV+Al 2 O 3 >UV, UV+Fe 2 O 3 . The potentiality of the oxides for promoting the photooxidation of COS implicates that the aerosol particles may contribute to the photooxidation of COS in the atmosphere.
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