Catalytic oxidation of CS_2 over atmospheric particles and oxide catalysts |
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Authors: | WANG Lin ZHANG Feng Chen Jianmin |
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Institution: | Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China |
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Abstract: | The catalytic oxidization of CS2 over atmospheric particles and some oxide catalysts
was explored through FT-IR, MS and a fixed-bed stainless steel reactor. The results show that at
mospheric particles and some oxide catalysts exhibited considerable oxidizing activities for CS2 at
ambient temperature. The reaction products are mainly COS and elemental sulfur, even CO2 on
some catalysts. Among the catalysts, CaO has the strongest catalytic activity for oxidizing CS2.
Fe2O3 is weaker than CaO. The catalytic activity for AI2O3 reduces considerably compared with the
former two catalysts, and SiO2 the weakest. Atmospheric particle samples' catalytic activity is be
tween Fe2O3's and AI2O3's. The atmospheric particle sample collected mainly consists of
Ca(AI2Si2O8)· 4H2O, which is also the main component of cement. COS, the main product, is
formed by the catalytic oxidization of CS2 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 CS2 could be catalytically oxidized over at
mospheric particles, which induced that this reaction may be another important source of atmos
pheric COS from CS2. |
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Keywords: | carbon disulfide carbonyl sulfide atmospheric particles oxides catalytic oxidization |
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