| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Design of Regular Pore Structure CeO2 and Study on the Preparation and Performance of Rh/CeO2 Catalyst for Particulate Matter Oxidation of Gasoline Vehicle |
| JIA Fengrui1, JIAO Yi2, LIU Zhimin3, YAO Peng2, WANG Jianli1, CHEN Yaoqiang1, LI Yun3,*
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1 College of Chemistry, Sichuan University, Chengdu 610064, China
2 Institute of New Energy and Low-carbon Technology, Sichuan University, Chengdu 610064, China
3 Sinocat Environmental Technology Co., Ltd., Chengdu 610041, China |
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Abstract Due to the small particle size, large amount and the difficulty of the deposit of particulate matters emitted from gasoline vehicles, it is harmful to human health and the environment. Installing the gasoline particulate filter (GPF) in the exhaust pipe is the most effective way to reduce particulate emissions. GPF requires a catalyst coated on its surface to maintain its high efficiency of capture and regeneration, in which the catalyst is key. However, the catalytic oxidation of soot particles is a typical gas-solid-solid three-phase interfacial reaction, and the key factors affec-ting the activity are the contact efficiency between the catalyst and soot and the gas-phase oxygen activation ability of the catalyst. In this work, CeO2 with 40 nm and 80 nm connected pore structures were prepared by using poly(acrylonitrile co styrene) copolymer microspheres as templates, Rh/CeO2 catalysts were prepared by using an impregnated method. The influences of pore size on the contact efficiency of catalyst-soot particles and the gas phase oxygen activation capacity of Rh introduction were systematically studied, so as to explore its influence on the oxidation activity of soot. The results of soot oxidation experiments show that the catalytic activity of CeO2 synthesized by template method is better than that of commercial CeO2, and the larger the pore size is, the better the activity is. Combined with the characterization results, the CeO2 with 80 nm connected pore structures has the optimal pore size, oxygen storage and oxygen mobility, and the corresponding Rh/CeO2 catalyst shows the better soot oxidation activity.
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Published: 10 August 2023
Online: 2023-08-07
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| Fund:National Natural Science Foundation of China (21902110) and National Engineering Laboratory for Mobile Source Emission Control Technology (NELMS2018A09). |
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2023, Vol. 37 
