Au/SnO2 and M-Au (M=Pt, Pd)/SnO2 Bimetallic Catalysts for the Low-Temperature Catalytic Oxidation of CO

作者：Ye Qing^*; Zhao Jian-Sheng; Li Dong-Hui; Zhao Jun; Cheng Shui-Yuan; Kang Tian-Fang

来源：Acta Physico - Chimica Sinica, 2011, 27(1): 169-176.

DOI：10.3866/PKU.WHXB20110108

• Au/SnO2
• Low-temperature catalytic oxidation of CO
• Preparation method
• Au binary catalyst

Au/SnO2 catalysts were prepared by deposition-precipitation (DP), co-precipitation (CP) and typical wet impregnation methods (IM). M(M= Pt, Pd)-promoted Au/SnO2 catalysts were prepared by the DP method. The samples were characterized by X-ray diffraction (XRD), Brunaner-Emmett-Teller (BET) adsorption, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) techniques. The results showed that compared with CP and IM, the DP method led to a fairly uniform dispersion of gold nanoparticles with diameters less than 5 nm and larger specific surfaces for the Au/SnO2 catalyst. The Au in Au/SnO2-DP was metallic (Au-0) while in Au/SnO2-CP and Au/SnO2-IM the Au consisted of a mixture of Au-0 and Au3+. The oxidation of carbon monoxide over the Au/SnO2-DP and M-promoted Au/SnO2-DP catalysts were investigated. We observed that the Pd- or Pt-doping of Au/SnO2-DP resulted in a significant increase in performance. We conclude that the different activities of the Au/SnO2 catalysts that were prepared using different preparation methods may be attributed to the size of the Au particles and the states of gold. A remarkable improvement in catalytic activity because of Pd or Pt doping was associated with strong interactions between Pd or Pt and Au.

• 出版日期2011-1
• 单位北京工业大学