物理化学学报 >> 2012, Vol. 28 >> Issue (01): 245-250.doi: 10.3866/PKU.WHXB201228245

材料物理化学 上一篇    下一篇

还原热处理对铈锆铝复合氧化物性能的影响

肖益鸿, 杨黄根, 蔡国辉, 郑勇, 郑瑛, 魏可镁   

  1. 福州大学化肥催化剂国家工程研究中心, 福州 350002
  • 收稿日期:2011-09-02 修回日期:2011-10-18 发布日期:2011-12-29
  • 通讯作者: 肖益鸿 E-mail:xyh@fzu.edu.cn
  • 基金资助:

    福建省工业科技重大项目(2010H6014)资助

Influence of Reductive Treatment on the Performance of CeO2-ZrO2-Al2O3 Composite Oxide

XIAO Yi-Hong, YANG Huang-Gen, CAI Guo-Hui, ZHENG Yong, ZHENG Ying, WEI Ke-Mei   

  1. National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, P. R. China
  • Received:2011-09-02 Revised:2011-10-18 Published:2011-12-29
  • Contact: XIAO Yi-Hong E-mail:xyh@fzu.edu.cn
  • Supported by:

    The project was supported by the Key Industrial Science-Technology Program of Fujian Province, China (2010H6014).

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摘要： 采用共沉淀法制备铈锆铝复合氧化物(CeO2-ZrO2-Al2O3, CZA)和铈锆复合氧化物(CeO2-ZrO2, CZ), 将样品分别在空气和10% H2/Ar 气氛下进行热处理, 利用X射线粉末衍射(XRD)、O2脉冲吸附、H2程序升温还原(H2-TPR)等手段研究了复合氧化物的结构及性能. 结果表明: CZA样品经950 °C还原热处理后出现CeAlO3晶相, 热处理温度越高, 越有利于CeAlO3物相生成. CZA 储氧量(OSC)随着还原热处理温度升高逐渐增大, 至900 °C达到1270.3 μmol·g-1; 温度继续升高, OSC减小, 1100 °C还原热处理后CZA的OSC仅为23.2 μmol·g-1. 研究发现还原热处理中形成CeAlO3, 其显著影响CZA样品的储氧性能和还原性能.

关键词: 铈锆铝复合氧化物, 还原热处理, CeAlO3, 储氧性能, 还原性能

Abstract: A CeO2-ZrO2-Al2O3 composite oxide (CZA) and a CeO2-ZrO2 composite oxide (CZ) were prepared by the co-precipitation method. The samples were thermally aged in a flowing air atmosphere and in 10% H2/Ar flow. The structure and performance of the composite oxides were studied by X-ray diffraction (XRD), oxygen storage capacity (OSC) measurements, and H2 temperature-programmed reduction (H2- TPR). The results show that a CeAlO3 phase was formed after CZA was reductively aged at 950 °C and an increase in temperature benefited the formation of CeAlO3. The OSC of CZA increased with an increase in the reductive treatment temperature and it was 1270.3 μmol·g-1 when the temperature reached 900 °C. However, the OSC decreased with an increase in the temperature. After CZA was reduced at 1100 °C the OSC was only 23.2 μmol·g-1. We found that the OSC and the reducibility of the material were remarkably influenced by the formation of a CeAlO3 phase after CZA was reductively aged.

Key words: CeO2-ZrO2-Al2O3 composite oxide, Reductive treatment, CeAlO3, Oxygen storage capacity, Reducibility