Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (01): 245-250.doi: 10.3866/PKU.WHXB201228245

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

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).

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

MSC2000: 

  • O643