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

作　　者：Jian Liu,Jie Xu,Zhen Zhao,Aijun Duan,Guiyuan Jiang,Yanni Jing State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China. 

出　　处：《Journal of Environmental Sciences》2010年第7期1104-1109,共6页环境科学学报（英文版）

基　　金：supported by the Hi-Tech Research and Development Program (863) of China (No.SQ2009AA06Z313);the National Natural Science Foundation of China (No. 20803093,20833011);the Doctor Selected Foundation for the University of State Education Ministry of China (No. 200804251016);the Beijing Outstanding Ph.D Thesis Foundation (No. YB20091141401)

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 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 La0.6 K0.4CoO3/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%.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 La0.6 K0.4CoO3/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%.

关 键 词：four-way combining catalyst diesel engine exhaust double layers perovskite oxides zeolite catalysts 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]