CS_2与大气颗粒物的多相催化反应研究

Heterogeneous Catalysis Reaction Between Carbon Disulfide and Atmospheric Particles

利用原位FTIR，XRD，XPS，BET，质谱和连续微量反应等手段研究了大气颗粒物及部分氧化物样品上CS2多相催化反应，确认了反应产物，并对催化剂的晶化状况和比表面积等进行了考察．结果表明，CS2 在氧化物和大气颗粒物样品上发生氧化反应，生成COS及单质硫，部分样品上生成CO2 ，活化状态下的[S]在大气颗粒物表面上能被进一步氧化为六价态硫．收集所得到的大气颗粒物样品成分主要是Ca（Al2Si2O8）·4H2O；CS2在氧化物或大气颗粒物样品上催化生成COS是催化剂表面吸附氧的作用之故．

Abstract The formation of carbonyl sulfide(COS) by catalytic oxidization of carbon disulfide (CS2) overatmospheric particle catalysts was explored through FTIR, MS and a fixed bed stainless steel reactor. XPSwas used to analyze the surface elements on the catalysts. Also the crystallizing conditions and specific sur-faces (areas) of the catalysts were investigated by means of XRD and BET. Some oxides such as CaO,Fe2O3, A12O3 and SiO2 were investigated under the conditions similar to those for the investigation of atmo-spheric particles as a comparison. The results showed that the atmospheric particles and the oxide catalystsexhibited considerably oxidizing activity for CS2 at ambient temperature to form COS. The adsorb activeoxygen over the catalysts' surfaces is the major reason for this reaction. A model was given to explain themechanism on the heterogeneous catalysis reaction. And elemental sulfur as well as COS was one of themain products, even CO2 could be produced by a secondary reaction on some catalysts. SO42- could be pro-duced by further oxidation of active elemental sulfur.