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化学学报
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化学学报 ›› 1998, Vol. 56 ›› Issue (8): 785-791. 上一篇    下一篇

研究论文

层状复合氧化物La~4BaCu~5~-~xMn~xO~1~2的表征及在催化消除NO中活性的研究

刘钰;杨向光;赵震;吴越   

  1. 中国科学院长春应用化学研究所
  • 发布日期:1998-08-15

Synthesis, characterization and catalytic behavior of layered mixed oxides La~4BaCu~5~-~xMn~xO~1~2 in NO reduction by CO

LIU YU;YANG XIANGGUANG;ZHAO ZHEN;WU YUE   

  • Published:1998-08-15

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采用柠檬酸配合法合成了结构呈层状ABO~3的La~4BaCu~5O~1~2复合氧化物, 并以它为基体合成了一系列Mn取代Cu的样品(La~4BaCu~5~-~xMn~xO~1~2, x=1-5)并利用XRD, IR进行了结构表征, 结果表明其均为5层的ABO~3结构。利用H~2-TPR考查了掺杂Mn以后样品的氧化还原性能的变化, 发现由于Mn的掺杂使Cu明显的容易还原。还考查了样品对NO+CO反应的催化活性, 结果表明反应的活性中心是Cu离子,但加入适量的Mn离子可以使活性提高。

关键词: 催化, 一氧化碳, 消除, 层状结构, 复合物, 催化活性, 一氧化氮, Ｎ-氧化物, 结构表征, 锰氧化物

A series of sample having the stoichiometry La~4BaCu~5~-~xMn~xO~1~2 (x=0-5) were prepared, characterized by XRD, IR and H~2-TPR and used as catalyst for NO+CO reaction. It was found that they have 5-layered ABO~3-type structure. The results of H~2-TPR showed that the Cu ion was more easily reduced while a part of them was replaced by Mn ions. Their catalytic behavior to NO+CO reaction was investigate, La~4BaCu~2Mn~3O~1~2 showed the highest catalyst activity for the reaction than the others. The reaction mechanism is discussed: the activity of the catalysts could be attributed to the Cu ions, but it was improved when Mn ions took the place of some Cu ions.

Key words: CATALYSIS, CARBON MONOXIDE, ELIMINATE, LAYER STRUCTURE, COMPLEX, CATALYTIC ACTIVITY, NITROGEN MONOXIDE, AMINE OXIDE, STRUCTURE CHARACTERISTICS

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