A novel four-way combining catalysts for simultaneous removal of exhaustpollutants from diesel engine |
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Authors: | Jian Liu Jie Xu Zhen Zhao Aijun Duan Guiyuan Jiang Yanni Jing |
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Affiliation: | State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China |
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Abstract: | A novel four-way combining catalysts containing double layers was applied to simultaneously remove four kinds of exhaustpollutants (NOx, CO, HC and PM) emitted from diesel engine. The four-way catalysts were characterized using scanning electronmicroscope (SEM) and Ultraviolet visible di use reflectance spectroscopy (UV-Vis DRS). Their catalytic performances were evaluatedby temperature-programmed reaction technology. The double layer catalysts could e ectively remove the four main pollutants. Thehighest catalytic activity was given by the two-layered catalysts of La0:6K0:4CoO3/Al2O3 andW/HZSM-5. Under the simulated exhaustgases conditions, the peak temperature of the soot combustion was 421°C, the maximal conversion of NO to N2 was 74%, thetemperature of the HC total conversion was 357°C, and the maximum conversion ratio of CO was 99%. |
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Keywords: | four-way combining catalyst diesel engine exhaust double layers perovskite oxides zeolite catalysts |
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