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Citation: JI Hong-bing, WANG Le-fu, CHEN Qing-lin. Development of Catalysts with Tunable Catalytic Oxidative Performance for Alcohols Conversion[J]. Acta Physico-Chimica Sinica, ;2005, 21(07): 746-751. doi: 10.3866/PKU.WHXB20050710 shu

Development of Catalysts with Tunable Catalytic Oxidative Performance for Alcohols Conversion

1.
School of Chemical and Energy Engineering, South China University of Technology, Guangzhou 510640

Received Date: 29 November 2004
Available Online: 15 July 2005

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.
- Ruthenium;Hydrotalcite;Alcohols;EXAFS;Catalytic oxidation
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