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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

掺杂Mn对Ce-Zr复合氧化物性能的影响

刘萍, 房华, 赵明, 张丽娟, 张晓玉, 龚茂初, 陈耀强   

  1. 四川大学化学学院, 成都 610064
  • 收稿日期:2005-11-28 修回日期:2006-04-21 出版日期:2006-11-20 网络出版日期:2006-11-20

Effects of Doping Manganese on the Properties of Ce-Zr Compound Oxides

LIU Ping, FANG Hua, ZHAO Ming, ZHANG Li-Juan, ZHANG Xiao-Yu, GONG Mao-Chu, CHEN Yao-Qiang   

  1. College of Chemistry, Sichuan University, Chengdu 610064, China
  • Received:2005-11-28 Revised:2006-04-21 Published:2006-11-20 Online:2006-11-20

PDF (PC)

1645

被引次数

18

摘要： 采用共沉淀方法制备了一系列Ce-Zr-Mn 复合氧化物储氧材料, 并应用X射线衍射(XRD), BET, 氧吸附, 以及程序升温还原(TPR)对这些样品进行表征, 研究了样品老化前后的结构和织构变化, 储氧性能, 还原性能以及物相的变化. 结果表明, 在Ce-Zr固溶体中掺入少量的Mn可以显著提高储氧材料的储氧能力, 降低还原温度, 而且均形成稳定的立方晶相的CeO2-ZrO2固溶体. 当Mn含量(摩尔分数)达到0.025时, 样品的储氧量达到最高, 同时在织构上表现出优越的抗老化性能, 经1273K高温老化5h后比表面积可高达57.8m2/g.

关键词: 铈锆锰复合氧化物, 储氧性能, 还原性, 抗老化

Abstract: A series of
Ce-Zr-Mn compound oxides oxygen storage materials were synthesized by a
co-precipitation method and characterized by X-ray diffraction (XRD), BET,
oxygen adsorption and temperature programmed reduction (TPR). The modification of the textural and structural properties, oxygen storage capacity, redox
behavior, and phase changes were investigated. The results show that incorporating a small amount of manganese into Ce-Zr solid solution can remarkably improve the oxygen storage capacity and decrease the temperature of the reduction of the oxygen storage materials. Moreover, only a stable
cubic phase CeO2-ZrO2 solid solution is formed. The Ce-Zr-Mn Compound oxide indicates the highest oxygen storage capacity (OSC) and excellent property of resistance to aging when manganese content (mole fraction) is
0.025, its surface area can reach 57.8m2/g after aging 5h at 1273K.

Key words: Ce-Zr-Mn compound oxides, OSC, reducibility, resistance to aging

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