Environmental catalysis and materials

A novel four-way combining catalysts for simultaneous removal of exhaustpollutants from diesel engine

Jian Liu , Jie Xu , Zhen Zhao , Aijun Duan , Guiyuan Jiang , Yanni Jing


Received June 01, 2009,Revised January 15, 2010, Accepted , Available online

Volume 22,2010,Pages 1104-1109

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A novel four-way combining catalysts containing double layers was applied to simultaneously remove four kinds of exhaust pollutants (NOx, CO, HC and PM) emitted from diesel engine. The four-way catalysts were characterized using scanning electron microscope (SEM) and Ultraviolet visible di use reflectance spectroscopy (UV-Vis DRS). Their catalytic performances were evaluated by temperature-programmed reaction technology. The double layer catalysts could e ectively remove the four main pollutants. The highest catalytic activity was given by the two-layered catalysts of La0:6K0:4CoO3/Al2O3 andW/HZSM-5. Under the simulated exhaust gases conditions, the peak temperature of the soot combustion was 421°C, the maximal conversion of NO to N2 was 74%, the temperature of the HC total conversion was 357°C, and the maximum conversion ratio of CO was 99%.

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