Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (05): 1097-1106.doi: 10.3866/PKU.WHXB201302262

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Influence of Composition of Ageing System on Performance of Ce0.65Zr0.35O2 Oxygen Storage Materials

HANG Li-Hua1,2, CHEN Shan-Hu3, ZHANG Qiu-Li3, GONG Mao-Chu3, CHEN Yao-Qiang1,3   

  1. 1 Institute of construction and environment of Sichuan University, Chengdu 610064, P.R.China;
    2 Institute of environment and resource of Southwest University of Science and Technology, Mianyang 621010, Sichuan, P. R. China;
    3 College of Chemistry of Sichuan University, Chengdu 610064, P. R. China
  • Received:2012-11-27 Revised:2013-02-26 Published:2013-04-24
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21173153) and Foundation of Science and Technology of Sichuan Province, China (2011GZ0035).

Abstract:

Ce0.65Zr0.35O2(CZ)mixed oxides were prepared by coprecipitation. The influence of ethanol on the performance of CZ and Pd based three-way catalysts was investigated. Samples were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen sorption, oxygen storage capacity (OSC), and hydrogen temperature-programmed reduction (H2-TPR) techniques. The precipitation aging method had an appreciable impact on oxide structure and catalyst performance. Samples aged in ethanol-water system exhibited wide pore-size distributions, large pore volumes and high redox properties, OSC and thermal stabilities. After calcination at 1000 ° C, the specific surface area and OSC of the samples were 29.3 m2·g-1 and 520 μmol·g-1, respectively. The excellent structural and textural properties resulted in a high catalytic activity, wide air-to-fuel operating range, and low light-off and full-conversion temperatures to C3H8, CO, and NO of the corresponding three-way catalyst.

Key words: Ethanol-water system, Ce0.65Zr0.35O2 oxygen storage material, Structure, Performance

MSC2000: 

  • O643