Abstract
The catalytic oxidization of CS 2 over atmospheric particles and some oxide catalysts was explored through FT-IR, MS and a fixed-bed stainless steel reactor. The results show that atmospheric particles and some oxide catalysts exhibited considerable oxidizing activities for CS 2 at ambient temperature. The reaction products are mainly COS and elemental sulfur, even CO 2 on some catalysts. Among the catalysts, CaO has the strongest catalytic activity for oxidizing CS 2 . Fe 2 O 3 is weaker than CaO. The catalytic activity for Al 2 O 3 reduces considerably compared with the former two catalysts, and SiO 2 the weakest. Atmospheric particle samples’ catalytic activity is between Fe 2 O 3 ’s and Al 2 O 3 ’s. The atmospheric particle sample collected mainly consists of Ca(Al 2 Si 2 O 8 )·4H 2 O, which is also the main component of cement. COS, the main product, is formed by the catalytic oxidization of CS 2 with adsorbed “molecular” oxygen over the catalysts’ surfaces. The concentration of adsorbed oxygen over catalysts’ surfaces may be the key factor contributed to the oxidizing activity. It is indicated that CS 2 could be catalytically oxidized over atmospheric particles, which induced that this reaction may be another important source of atmospheric COS from CS 2 .
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