A novel diesel oxidation catalyst with low SO2 oxidation activity and capable of meeting Euro V emission standards

doi:10.1016/S1872-2067(12)60545-2

Chinese Journal of Catalysis ›› 2013, Vol. 34 ›› Issue (4): 667-673.DOI: 10.1016/S1872-2067(12)60545-2

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A novel diesel oxidation catalyst with low SO₂ oxidation activity and capable of meeting Euro V emission standards

CHEN Yongdong^a, WANG Lei^b, GUAN Xiaoxu^a, TANG Shuihua^a, GONG Maochu^c, CHEN Yaoqiang^c

a State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan, China;
b Sichuan Zhongzi Exhaust Purge Co., Ltd., Chengdu 610225, Sichuan, China;
c Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China

Received:2012-12-18 Revised:2013-01-30 Online:2013-04-23 Published:2013-04-24
Supported by:
This work was supported by the National Natural Science Foundation of China (21173153), Opening Project of Key Laboratory of Green Catalysis of Sichuan Institutes of High Education (LYY1101), the Scientific Research Fund of Sichuan Provincial Education Department (12ZB163), the Science and Technology Foundation of Southwest Petroleum University (2012XJZ037), and the Runner Technology Innovation Project of Sichuan Province (2012ZZ072).

Abstract

Abstract:

A diesel oxidation catalyst was prepared from several high performance materials: the new rare earth oxygen storage compound Ce_0.75Zr_0.25O₂-Al₂O₃, the composite oxide Ti_0.9Zr_0.1O₂ and chromium-modified β molecular sieve. These component materials were characterized and used to prepare a Pt-based catalyst designed to reduce diesel engine exhaust emissions. The results of low temperature N₂ adsorption-desorption and oxygen storage capacity tests demonstrated that Ce_0.75Zr_0.25O₂-Al₂O₃ exhibits a large specific surface area and excellent oxygen storage capacity, and that Ti_0.9Zr_0.1O₂ exhibits superior textural properties. Evaluations of catalytic activity showed that the catalyst prepared from these materials has reduced capacity for the oxidation of SO₂ but high catalytic activity towards the oxidation of hydrocarbons (HC) and CO, and is also able to convert the exhaust soluble organic fraction at temperatures as low as 140℃. Tests using a domestic YC4F-type diesel engine found that exhaust treated by the catalyst prepared in this research is capable of meeting the HC and CO emission requirements of the Euro V standard.

Key words: Oxygen storage material, Titanium, Zirconium, Composite material, Chromium-modified molecular sieve, Oxidation catalyst

CHEN Yongdong, WANG Lei, GUAN Xiaoxu, TANG Shuihua, GONG Maochu, CHEN Yaoqiang. A novel diesel oxidation catalyst with low SO₂ oxidation activity and capable of meeting Euro V emission standards[J]. Chinese Journal of Catalysis, 2013, 34(4): 667-673.

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A novel diesel oxidation catalyst with low SO₂ oxidation activity and capable of meeting Euro V emission standards

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