Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (07): 746 -751.doi: 10.3866/PKU.WHXB20050710

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Development of Catalysts with Tunable Catalytic Oxidative Performance for Alcohols Conversion

JI Hong-bing; WANG Le-fu; CHEN Qing-lin   

  1. School of Chemical and Energy Engineering, South China University of Technology, Guangzhou 510640
  • Received:2004-11-29 Revised:2005-01-30 Published:2005-07-15
  • Contact: JI Hong-bing E-mail:cehbji@scut.edu.cn

Abstract: The catalytic oxidative performance of Mg-Al-Ru-CO3 hydrotalcite, Co-Al-Ru-CO3 hydrotalcite, Ru-Co(OH)2-CeO2 was well designed and tuned with substitution method. The XRD characterization presented that both the Mg-Al-Ru-CO3 catalyst and Co-Al-Ru-CO3 catalyst could keep hydrotalcite structure after the partial substitution of Al with Ru. However, after the substitution of Al with Ce, the structure of the obtained Ru-Co(OH)2-CeO2 catalyst was microcrystals of cobalt hydroxide and cerium oxide. The results of XPS and Ru K-edge XAFS suggested that the isolated Ru atom in Mg-Al-Ru-CO3 hydrotalcite was surrounded by 6 oxygen atoms with only one type of Ru-O shells, which catalyzed alcohols oxidation efficiently; the isolated Ru atom in Co-Al-Ru-CO3 hydrotalcite was surrounded by 6 oxygen atoms with two types of Ru-O shells, therein unsaturated Ru═O double bond was responsible for higher catalytic efficient for alcohols oxidation; the isolated Ru atom in Ru-Co(OH)2-CeO2 catalyst surrounded by 5 oxygen atoms with two types of Ru-O shells, therein the unsaturated coordination of Ru was the key to attain higher ability for various kinds of alcohols oxidation.

Key words: Ruthenium, Hydrotalcite, Alcohols, EXAFS, Catalytic oxidation