Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (04): 428-431.doi: 10.3866/PKU.WHXB20040421

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Preparation and Catalytic Activity of Au/SnO2 for Low-temperature CO Oxidation

Wang Shu-Rong;Wu Shi-Hua;Shi Juan;Zheng Xiu-Cheng;Huang Wei-Ping   

  1. Department of Chemistry, Nankai University, Tianjin 300071
  • Received:2003-09-23 Revised:2003-11-28 Published:2004-04-15
  • Contact: Wu Shi-Hua

Abstract: Three Au/SnO2 catalysts with different gold loading were prepared via deposition-precipitation method, and characterized by XRD and UV-Vis. The effects of pH of deposition solution, Au loading and pretreatment condition on the catalytic activity of Au/SnO2 catalysts for low-temperature CO oxidation were investigated. The results showed that (1) the mean Au particle size of Au/SnO2 catalyst prepared at pH=9~10 deposition condition was the smallest among the samples obtained at different deposition pH; (2) the catalytic activity decreased with the increase of Au loading; (3) among the 2%Au/SnO2 catalyst samples calcined at different temperatures in air for 4 h, the catalytic activity of the sample calcined at 473 K was the highest; (4) the catalyst samples pretreated at low temperature in H2 exhibited higher activity, and the activity of the sample obtained at 373 K for 2 h was the highest among all Au/SnO2 samples in this work.

Key words: Au/SnO2 catalyst, Deposition-precipitation method, Catalytic activity, Low-temperature CO oxidation