Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (09): 850-854.doi: 10.3866/PKU.WHXB20010919

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Catalytic Combustion of Methane over Tin Dioxide Supported Silver Catalysts

Zhou Chang-Jun;Zhu Yue-Xiang;Xie You-Chang   

  1. Institute of Physical Chemistry, Peking University, Beijing 100871
  • Received:2001-02-21 Revised:2001-05-10 Published:2001-09-15
  • Contact: Zhu Yue-Xiang E-mail:zhuyx@ipc.pku.edu.cn

Abstract: Catalytic property of Ag/SnO2 catalysts for the combustion of methane was investigated and the state of silver was characterized by using XRD,BET, XPS, TEM and TPR. The results show that Ag/SnO2 system is quite active for the catalytic combustion of methane. When Ag/Sn atomic ratio is lower than 0.20, the main silver species is silver oxide existing in both dispersed state and crystal phase, and all the corresponding catalysts show relatively large surface areas and high catalytic activities. If silver content further increases, metallic silver shows up and becomes the main silver species, and the surface areas as well as the catalytic activities of the samples decrease dramatically. The sample with a Ag/Sn atomic ratio of 0.20 has the highest activity.

Key words: Methane, Catalytic combustion, Silver, Tin dioxide