【摘 要】
：
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
【机 构】
：
State Key Laboratory of Heavy Oil Processing
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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 diffuse reflectance spectroscopy (UV-Vis DRS). Their catalytic performances were evaluated by temperature-programmed reaction technology. The double layer catalysts could effectively remove the four main pollutants. The highest catalytic activity was given by the two-layered catalysts of La0.6K0.4CoO3/Al2O3 and W/HZSM-5. Under the simulated exhaust gases conditions, the peak temperature of the soot combustion was 421℃, the maximal conversion of NO to N2 was 74%, the temperature of the HC total conversion was 357℃, and the maximum conversion ratio of CO was 99%.
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