Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (05): 1048-1054.doi: 10.3866/PKU.WHXB201303051

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Catalytic Oxidation of Soluble Organic Fraction in Diesel Exhausts Using Composite Oxides (CeO2)x(La-Al2O3)1-x

CHEN Yong-Dong, WANG Lei, GUAN Xiao-Xu, LIU Yong-Bing, GONG Mao-Chu, CHEN Yao-Qiang   

  1. 1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, P. R. China;
    2 Southwest Research & Design Institute of Chemical Industry, Chengdu 610225, P. R. China;
    3 Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
  • Received:2012-12-06 Revised:2013-03-05 Published:2013-04-24
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21173153), Scientific Research Fund of Sichuan Provincial Education Department, China (12ZB163), Opening Project of Key Laboratory of Green Catalysis of Sichuan Institutes of High Education, China (LYY1101), Runner Technology Innovation Project of Sichuan Province, China (2012ZZ072), and Science and Technology Foundation of Southwest Petroleum University, China (2012XJZ037).

Abstract:

A series of catalytic composite oxides (CeO2)x(La-Al2O3)1-x (with mass fractions x=0.00, 0.25, 0.50, 0.75, 1.00) was prepared using a co-precipitation method. Thermogravimetric-differential thermal analysis (TG-DTA) was used to determine the performances of these composite oxides in the catalytic oxidation of the soluble organic fraction (SOF) of diesel exhaust. The results show that the catalyst with the highest activity, i.e., x=0.75, enabled the SOF to light-off at 125℃ and completely converted the SOF at 355℃. The catalysts were characterized using low-temperature N2 absorption-desorption, oxygen-storage capacity (OSC) measurements, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and H2 temperature-programmed reduction(H2-TPR). The results indicate that co-doping appropriate amounts of La and Al into the catalyst increases the specific surface area of the cerium oxide and the proportion of Ce3+ in the catalyst. This may improve the catalyst's adsorption abilities at low temperature and its OSC, enhancing its activity in SOF oxidation. These (CeO2)0.75(La-Al2O3)0.25 composite oxides are promising catalysts for diesel oxidation.

Key words: Cerium, Aluminum, Composite oxide, Soluble organic fraction, Catalytic oxidation

MSC2000: 

  • O643