Citation: 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 Physico-Chimica Sinica, ;2015, 31(12): 2358-2365. doi: 10.3866/PKU.WHXB201510135 shu

Influence of La on CeO₂-ZrO₂ Catalyst for Oxidation of Soluble Organic Fraction from Diesel Exhaust

1.
1 Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China;
2.
2 College of Architecture and Environment, Sichuan University, Chengdu 610064, P. R. China;
3.
3 Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610064, P. R. China

Corresponding author: XU Hai-Di, CHEN Yao-Qiang,
Received Date: 31 July 2015
Available Online: 12 October 2015
Fund Project: 国家自然科学基金(21173153) (21173153)国家高技术研究发展计划项目(863) (2013AA065304)资助 (863) (2013AA065304)

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.
- CeO₂-ZrO₂,
- La-modified CeO₂-ZrO₂,
- Soluble organic fraction,
- Diesel oxidation catalyst,
- Chemisorbed oxygen
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Influence of La on CeO2-ZrO2 Catalyst for Oxidation of Soluble Organic Fraction from Diesel Exhaust

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Influence of La on CeO₂-ZrO₂ Catalyst for Oxidation of Soluble Organic Fraction from Diesel Exhaust