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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (8): 751-755. 上一篇    下一篇

研究论文

纳米Ce1—xMnxO2催化剂上乙醇催化氧化发光研究

叶青，高岐，张新荣，徐柏庆*   

  1. (清华大学化学系 有机光电子与分子工程教育部重点实验室分子催化与定向转化研究室 北京100084)
  • 投稿日期:2005-07-20 修回日期:2005-12-09 发布日期:2006-04-25
  • 通讯作者: 徐柏庆

Cataluminescent Characteristics of Catalytic Ethanol Oxidation over Ce1—xMnxO2 Catalysts

YE Qing, GAO Qi, ZHANG Xin-Rong, XU Bo-Qing*   

  1. (Innovative Catalysis Program, Key Laboratory of Organic Optoelectronics & Molecular Engineering,
    Department of Chemistry, Tsinghua University, Beijing 100084)
  • Received:2005-07-20 Revised:2005-12-09 Published:2006-04-25
  • Contact: XU Bo-Qing

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研究了纳米Ce1—xMnxO2上乙醇催化氧化发光特性, 重点考察了反应温度和催化剂组成(Ce/Mn比)对发光强度的影响规律. 为研究催化发光机理, 在相近的反应条件下考察了纳米Ce1—xMnxO2上乙醇催化氧化反应的活性和选择性. 结果表明: 催化发光强度与催化反应中生成CH3CHO的产率有很好的顺变关系, 表明CH3CHO是导致C2H5OH分子在纳米Ce1—xMnxO2催化剂上氧化发光的“活性分子”.

关键词: 纳米Ce1—xMnxO2, 乙醇氧化, 催化发光, 乙醛, 氧化脱氢

This work reports the cataluminescent characteristics of nanosized Ce1—xMnxO2 (0≤x≤1) samples in the catalytic oxidation of ethanol. It is shown that the intensity of cataluminescence was significantly affected by the reaction temperature and the composition or Ce/Mn ratio of Ce1—xMnxO2. To elucidate mechanism of cataluminescence, the catalytic activity and product selectivity of ethanol oxidation was also studied over the Ce1—xMnxO2 under conditions similar to the cataluminescence study. The results reveal that the intensity of cataluminescence was basically associated with the oxidative dehydrogenation of ethanol to form acetaldehyde. Therefore, the intermediate species of cataluminescence of ethanol oxidation could be elated with the formation of acetaldehyde at the catalyst surface.

Key words: nanosized Ce1—xMnxO2, cataluminescence, catalytic oxidation of ethanol, acetaldehyde, oxidative dehydrogenation