Catalytic Combustion Of Chlorobenzene Over Silicotungstic Acid Modified CeO₂ Catalyst

Catalytic combustion was a highly efficient method for the treatment of chlorinated volatile organic compounds（CVOCs）,and the development of highly efficient catalysts was the focus of this method.In this paper,the silicotungstic acid（HSi W）was used to modify the CeO₂ to enhance the redox ability and surface acidity of the catalysts,and investigated the catalytic combustion performance for chlorobenzene of HSi W/CeO₂catalysts.And then the HSi W/CeO₂ catalysts were loaded with different mass fractions of Pt to investigate the influence of Pt loading on the catalytic performance of chlorobenzene.The research in this paper shows that the HSi W/CeO₂ catalysts were prepared by hydrothermal method using cerium acetate,cerium sulfate,cerium nitrate and cerium chloride,and the catalytic combustion activity for chlorobenzene of catalysts was studied.The HSi W modified CeO₂ catalyst prepared by cerium acetate had strong ability to resist the coke deposition and Cl species.In order to further improve the catalytic activity of the catalyst,the HSi W modified CeO₂ catalysts（prepared by cerium acetate）with different mass fractions of Pt（0.5%,1.0%,1.5%,2.0%and 3.0%）were prepared by hydrothermal method,and the catalytic combustion activity for chlorobenzene of catalysts was studied.The effect of precious metal Pt on the redox ability of HSi W/CeO₂ catalysts was investigated.The results showed that the HSi W modified CeO₂ catalyst prepared by cerium acetate had abundant weak acid sites,more Ce³⁺species and surface adsorption oxygen species,so the catalyst prepared by cerium acetate showed the best catalytic activity.And then the catalyst had the best catalytic activity and thermal stability when the precious metal Pt loading was 2.0%.The by-products during the catalytic combustion of chlorobenzene were reduced obviously after supported the precious metal Pt,which was related to the higher redox performance of the supported precious metal catalyst.