A mesoporous oxidation catalyst La–Co–Ce–O prepared by citric acid complexation and organic template decomposition method

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• 作者：Jin-yong Luo ; Ming Meng ; Ying Qian ; Zhi-Qiang Zou ; Ya-ning Xie ; Tian-dou Hu ; Tao Liu and Jing Zhang
• 关键词：mesoporous catalyst ; La–Ce–Co–O ; citric acid complexation ; total oxidation ; structural characterization
• 刊名：Catalysis Letters
• 出版年：2007
• 出版时间：July, 2007
• 年：2007
• 卷：116
• 期：1-2
• 页码：50-56
• 全文大小：527 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Physical Chemistry
  Industrial Chemistry and Chemical Engineering
  Pharmacy
  
• 出版者：Springer Netherlands
• ISSN：1572-879X

文摘

The mesoporous catalysts La–Co–Ce–O were successfully prepared in one step by citric acid complexation-organic template decomposition method, which show large surface area (up to 157 m2/g), narrow pore diameter distribution (3.7～3.9 nm), good thermal stability and high activity for CO and C₃H₈ oxidation. Based on the structural characterization results, it is found that the predominant Co phases are Co₃O₄ crystallites, and the activities of these mesoporous catalysts are not proportional to the amounts of surface cobalt atoms, but mainly related to the physical structure of the catalysts and the effective interaction between cobalt and cerium species. When the surface Co/Ce atomic ratio is close to 1, the catalytic synergy effect between them is maximized.