Photooxidation of carbonyl sulfide (COS) under UV irradiation and the role of the oxides such as SiO2, Al2O3 and Fe2O3 were investigated byin situ FTIR in a long optical path cell. The major products were identified as SO2and CO2 by means of IR spectra and GC-MS. SO2 was partially oxidized into SO2 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 x 10−4·s−1 and AI2O3 promote the photooxidation of COS significantly, but Fe2O3 has no obvious influence on the reaction. The reaction rates in the presence of the oxides or not, rank as: UV + SiO2⊳ UV +AI2O3⊳ UV, UV + Fe2O3. 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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Wu, H., Wang, X. & Chen, J. Photooxidation of carbonyl sulfide in the presence of the typical oxides in atmospheric aerosol. Sc. China Ser. B-Chem. 48, 31–37 (2005). https://doi.org/10.1007/BF02990910
- carbonyl sulfide
- atmospheric aerosol
- in situ FTIR