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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2015,Vol.31>> Issue(12)>> 2358-2365     doi: 10.3866/PKU.WHXB201510135         中文摘要
CATALYSIS AND SURFACE SCIENCE
Influence of La on CeO2-ZrO2 Catalyst for Oxidation of Soluble Organic Fraction from Diesel Exhaust
YANG Yi1, YANG Zheng-Zheng2, XU Hai-Di3, XU Bao-Qiang1, ZHANG Yan-Hua1, GONG Mao-Chu1, CHEN Yao-Qiang1
1 Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China;
2 College of Architecture and Environment, Sichuan University, Chengdu 610064, P. R. China;
3 Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610064, P. R. China
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CeO2-ZrO2 and CeO2-ZrO2-La2O3 catalysts with mass ratios of 60:40 and 60:30:10 were prepared by co-precipitation method, respectively. The catalytic activity in oxidation of the soluble organic fraction (SOF) in diesel exhausts was studied using thermogravimetric-differential thermal analysis (TGDTA). The results indicate that the catalytic activity of the La-modified CeO2-ZrO2 catalyst is better than that of the CeO2-ZrO2 catalyst; the light-off temperature of SOF is 164 ℃, and the weightlessness fastest point temperature is 212 ℃, whereas for CeO2-ZrO2, these temperatures are 168 and 221 ℃, respectively. X-ray diffraction (XRD) shows that modification with La is beneficial to decrease the growth rate of the crystallite size relative to that of CeO2-ZrO2 after high-temperature ageing. N2 adsorption-desorption results suggest that the addition of La enlarges the surface area. O2-temperature-programmed desorption (O2- TPD) and X-ray photoelectron spectroscopy (XPS) show that modification with La increases the amount of chemisorbed oxygen on the CeO2-ZrO2 catalyst. The CeO2-ZrO2-La2O3 catalyst shows better activity and ageing resistance than the CeO2-ZrO2 catalyst.



Keywords: CeO2-ZrO2   La-modified CeO2-ZrO2   Soluble organic fraction   Diesel oxidation catalyst   Chemisorbed oxygen  
Received: 2015-07-31 Accepted: 2015-10-12 Publication Date (Web): 2015-10-13
Corresponding Authors: XU Hai-Di, CHEN Yao-Qiang Email: xuhaidi@scu.edu.cn;nic7501@scu.edu.cn

Fund: The project was supported by the National Natural Science Foundation of China (21173153) and National High-Tech Research and Development Program of China (863) (2013AA065304).

Cite this article: YANG Yi, YANG Zheng-Zheng, XU Hai-Di, XU Bao-Qiang, ZHANG Yan-Hua, GONG Mao-Chu, CHEN Yao-Qiang. Influence of La on CeO2-ZrO2 Catalyst for Oxidation of Soluble Organic Fraction from Diesel Exhaust[J]. Acta Phys. -Chim. Sin., 2015,31 (12): 2358-2365.    doi: 10.3866/PKU.WHXB201510135

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