Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (01): 169-176.doi: 10.3866/PKU.WHXB20110108

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

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

YE Qing, ZHAO Jian-Sheng, LI Dong-Hui, ZHAO Jun, CHENG Shui-Yuan, KANG Tian-Fang   

  1. Department of Environmental Science, College of Environmental and Energy Engineering, Beijing University of Technology,Beijing 100124, P. R. China
  • Received:2010-08-10 Revised:2010-10-12 Published:2010-12-31
  • Contact: YE Qing E-mail:yeqing@bjut.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20777005), Beijing Natural Science Foundation, China (8082008), Beijing Municipal Foundation for Excellent Person of Ability, China (20071D0501500210) and Advanced Strategy for Developing Education and Accumulating Talents in Beijing University of Technology, China (PHR201007105).

Abstract:

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 (Au0) while in Au/SnO2-CP and Au/SnO2-IM the Au consisted of a mixture of Au0 and Au3+. The oxidation of carbon monoxide over the Au/SnO2-DP and Mpromoted 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.

Key words: Au/SnO2, Low-temperature catalytic oxidation of CO, Preparation method, Au binary catalyst

MSC2000: 

  • O643