高等学校化学学报

高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (1): 155.doi: 10.7503/cjcu20120340

• 物理化学 • 上一篇    下一篇

纳米Ag, CeO2和Ag-CeO2的合成及在CO催化氧化中的应用

陈婧1, 黄新松2, 李广社2   

  1. 1. 内蒙古大学化学化工学院, 呼和浩特 010021;
    2. 中国科学院煤制乙二醇及相关技术重点实验室, 福建物质结构研究所, 福州 350002
  • 收稿日期:2012-04-13 发布日期:2012-12-31
  • 通讯作者: 黄新松,男,助理研究员,主要从事多相催化方面的研究.E-mail:xshuang@fjirsm.ac.cn E-mail:xshuang@fjirsm.ac.cn
  • 基金资助:

    国家自然科学基金(批准号: 51072198, 91022018)资助.

Synthesis of Ag, CeO2, Ag-CeO2 Nanoparticles and Their Applications in Catalytic CO Oxidation

CHEN Jing1, HUANG Xin-Song2, LI Guang-She2   

  1. 1. School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China;
    2. Key Lab of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
  • Received:2012-04-13 Published:2012-12-31

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摘要：

系统合成了不同粒径的CeO2和Ag纳米粒子及Ag-CeO2纳米复合粒子, 并对其进行了结构表征和CO催化氧化性能测试. 结果表明, Ag纳米粒子的催化活性较低, 以其为催化剂时CO的最大催化转化率仅为40%, 且粒径越小越容易失活; 在CeO2纳米粒子催化下, CO的催化转化率可达到100%, 但催化反应的温度较高(约350℃); 与CeO2和Ag相比, Ag-CeO2的催化性能明显增强, CO在较低的温度(150℃)下可实现完全转化. 程序升温还原(Temperature-programmed reduction, TPR)分析结果表明, 纳米复合材料中Ag和CeO2之间的相互作用是产生优异催化性能的关键原因.

关键词: CeO2, 纳米催化材料, 水热合成, CO催化氧化

Abstract:

CeO2 and Ag nanoparticles and Ag-CeO2 nanocomposites were systematically prepared. The structures of the catalysts and the catalytic activity for CO oxidation were studied. The results indicate that the catalytic activity of Ag is rather poor. The highest conversion of CO oxidation was only 40%, and smaller particles led to the worsening of the catalytic activity; for CeO2 nanoparticles, the conversion of CO oxidation could be as high as 100%, while the reaction temperature was relatively high(ca. 350℃). Compared with CeO2 and Ag nanoparticles, Ag-CeO2 nanocomposites showed a markedly enhanced catalytic property: CO can be completely oxidized to CO2 at temperature as low as 150℃. The excellent catalytic performance of the Ag-CeO2 nanocomposites is due to the interactions between Ag and CeO2 in nanocomposites. We discussed the relevant catalytic processes using temperature-programmed reduction (TPR) technology.

Key words: Cerium dioxide(CeO2), Nano catalytic material, Hydrothermal synthesis, CO catalytic oxidation

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