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《Environmental Science》 2008-06
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Preparation of Cu/ZrO_2/S_2O~(2-)_8/γ-Al_2O_3 Solid Acid Catalyst and Its Catalytic Activity to Selective Reduction of NO

GUO Xi-kun,WANG Xiao-ming(Department of Chemistry,Shantou University,Shantou 515063,China)  
Cu/ZrO_2/S_2O~(2-)_8/γ-Al_2O_3 solid acid catalyst was prepared by loading of(NH_4)_2S_2O_8,ZrOCl_2 and Cu(NO_3)_2 onto γ-Al_2O_3 step by step,which was obtained from calcining of pseudoboehmite.The catalytic property of Cu/ZrO_2/S_2O~(2-)_8/γ-Al_2O_3 on the selective reduction of NO by C_3H_6 in excess oxygen was investigated.The relationship between the structure and the catalytic property of Cu/ZrO_2/S_2O~(2-)_8/γ-Al_2O_3 catalyst was also explored by means of SEM,XRD,Py-IR and TPR.The experimental results of catalytic activity of the title catalyst indicated that the maximum conversion rate of NO could reach 82.9% in the absence of water and was up to 80.2% even in the presence of 10% water vapor.The results of the structural characterization toward the catalyst showed that S_2O~(2-)_8 and ZrO_2 could restrain the sinteration of γ-Al_2O_3 particles and the formation of CuAl_2O_4 spinelle,and also facilitate the formation of new acidic sites(Brnsted acid) and the enhance of the acidity on the surface of the catalyst.In addition, ZrO_2 could increase the reducibility of Cu on the catalyst.Consequently,the catalytic activity and hydrothermal stability of the catalyst were improved effectively.
【Fund】: 广东省科技计划项目(2006B36702003);; 汕头大学研究与发展项目(130-512042)
【CateGory Index】: O643.3
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