Citation: CHEN Yong-Dong, WANG Lei, GUAN Xiao-Xu, LIU Yong-Bing, NG Mao-Chu, CHEN Yao-Qiang. Catalytic Oxidation of Soluble Organic Fraction in Diesel Exhausts Using Composite Oxides (CeO₂)_x(La-Al₂O₃)_1-x[J]. Acta Physico-Chimica Sinica, ;2013, 29(05): 1048-1054. doi: 10.3866/PKU.WHXB201303051 shu

Catalytic Oxidation of Soluble Organic Fraction in Diesel Exhausts Using Composite Oxides (CeO₂)_x(La-Al₂O₃)_1-x

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 Date: 6 December 2012
Available Online: 5 March 2013
Fund Project: 国家自然科学基金(21173153) (21173153) 四川省教育厅一般项目(12ZB163) (12ZB163) 绿色催化四川省高校重点实验室开放课题基金(LYY1101) (LYY1101) 四川省科技创新苗子工程项目(2012ZZ072) (2012ZZ072)西南石油大学校级科技基金(2012XJZ037)资助 (2012XJZ037)

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.
- Cerium,
- Aluminum,
- Composite oxide,
- Soluble organic fraction,
- Catalytic oxidation
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Catalytic Oxidation of Soluble Organic Fraction in Diesel Exhausts Using Composite Oxides (CeO2)x(La-Al2O3)1-x

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通讯作者: 陈斌, bchen63@163.com

Catalytic Oxidation of Soluble Organic Fraction in Diesel Exhausts Using Composite Oxides (CeO₂)_x(La-Al₂O₃)_1-x