Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (04): 925-931.doi: 10.3866/PKU.WHXB20110343

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Catalytic Combustion of Diesel Soot over Ce0.5+xZr0.4-xLa0.1O2-Al2O3 Catalysts

ZHU Yi, WANG Jian-Li, CHEN Yong-Dong, LIAO Chuan-Wen, WANG Shi-Dan, GONG Mao-Chu, CHEN Yao-Qiang   

  1. College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
  • Received:2010-10-20 Revised:2010-12-22 Published:2011-03-29
  • Contact: CHEN Yao-Qiang E-mail:nic7501@scu.edu.cn
  • Supported by:

    The projected was supported by the National Natural Science Foundation of China (20773090) and Research Fund for Ph.D. Program of the Ministry of Education, China (20080610009).

Abstract:

Ce0.5+x Zr0.4-x La0.1O2-Al2O3 catalysts were prepared by co-precipitation, where 0≤x≤0.4 and the mass ratio of Ce0.5+xZr0.4-xLa0.1O2:Al2O3 was 1:1. The catalytic activities of these catalysts for the catalytic combustion of diesel soot were investigated. The catalysts were further characterized by low temperature nitrogen adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H2- temperature-programmed reduction (H2-TPR), and O2-temperature-programmed desorption (O2-TPD). The results showed that all the catalysts formed solid solutions with a fluorite-like structure. When x=0.2, the Ce3+ ions were partly rich on the surface of the catalyst. The catalyst was easily reduced by H2 and the desorption peak area of the β oxygen species was the largest. The light-off temperature was 360 °C for the catalytic combustion of diesel soot over the catalyst suggesting good catalytic activity and potential application in diesel soot catalytic combustion.

Key words: Solid solution, Soot, Diesel, Catalytic combustion

MSC2000: 

  • O643