Chinese Journal of Applied Chemistry

Chinese Journal of Applied Chemistry ›› 1996, Vol. 0 ›› Issue (4): 89-91.

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Promoter Action of Ag on Cr-Ag/γ-Al2O3 Catalyst for CO Oxidation

Chen Ping1, Zhu Bo1, Zhong Yijun1, Luo Mengfei1, Li Shaohua1, Wu Hongli2   

  1. 1. Catalysis Institute, Hangzhou University, Hangzhou 310028;
    2. Central Laboratory, Hangzhou University, Hangzhou
  • Received:1995-10-30 Revised:1996-04-01 Published:1996-08-10 Online:1996-08-10

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Abstract: A series ofγ-Al2O3-supported Cr-Ag bimetallic and individual mono-metallic catalysts was prepared by wetness impregnation method.The oxidation activity of CO was determined in a gas flow system. The effect of promoter Ag was studied by BET, XRD and TPR. The activity of Cr/γ-Al2O3 catalyst for CO oxidation was relatively poor. As the silver loading increased, the temperature of 100% coversion of CO over Ag/γ-Al2O3 catalysts decreased rapidly. The oxidation activity of catalyst was evidently enhanced by the addition of Ag, and increased with the content of Ag. The result of TPR showed that Ag could substantially change the reducibility of catalyst, TM decreased about 75℃,and the oxidation activity of catalyst was promoted.

Key words: chromic oxide, silver oxide, alumina, supported catalyst, reducibility, CO, oxidation activity

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