Promoting effect of vanadium on catalytic activity of Pt/Ce–Zr–O diesel oxidation catalysts  

作　　者：Haifeng Huang Bo Jiang Lei Gu Zhonghua Qi Hanfeng Lu 

机构地区：[1]College of Biological and Environmental Engineering, Zhejiang University of Technology [2]Research Institute of Catalytic Reaction Engineering, College of Chemical Engineering, Zhejiang University of Technology

出　　处：《Journal of Environmental Sciences》2015年第7期135-142,共8页环境科学学报（英文版）

基　　金：financial support from the Natural Science Foundation of China (No. 21107096);the Zhejiang Provincial Natural Science Foundation of China (No. Y14E080035);the Commission of Science and Technology of Zhejiang province (No. 2013C03021)

摘　　要：A series of Pt-V/Ce-Zr-O diesel oxidation catalysts was prepared using the impregnation method. The catalytic activity and sulfur resistance of Pt-V/Ce-Zr-O were investigated in the presence of simulated diesel exhaust. The effect of vanadium on the structure and redox properties of the catalysts was also investigated using the Brunauer-Emmett-Teller method,X-ray diffraction, H2temperature-programmed reduction, CO temperature-programmed desorption, X-ray photoelectron spectroscopy, and Energy Dispersive Spectroscopy. Results showed that the Pt particles were well dispersed on the Ce-Zr-O carrier through the vanadium isolation effect, which significantly improved the oxidation activity toward CO and hydrocarbons. An electron-withdrawing phenomenon occurred from V to Pt, resulting in an increase in the metallic nature of platinum, which was beneficial to hydrocarbon molecular activation.A series of Pt-V/Ce-Zr-O diesel oxidation catalysts was prepared using the impregnation method. The catalytic activity and sulfur resistance of Pt-V/Ce-Zr-O were investigated in the presence of simulated diesel exhaust. The effect of vanadium on the structure and redox properties of the catalysts was also investigated using the Brunauer-Emmett-Teller method,X-ray diffraction, H2temperature-programmed reduction, CO temperature-programmed desorption, X-ray photoelectron spectroscopy, and Energy Dispersive Spectroscopy. Results showed that the Pt particles were well dispersed on the Ce-Zr-O carrier through the vanadium isolation effect, which significantly improved the oxidation activity toward CO and hydrocarbons. An electron-withdrawing phenomenon occurred from V to Pt, resulting in an increase in the metallic nature of platinum, which was beneficial to hydrocarbon molecular activation.

关 键 词：Diesel oxidation converter （DOC） Pt-V/Ce-Zr-O VANADIUM Catalytic performance Sulfur resistance 

分 类 号：X734.2[环境科学与工程—环境工程] O643.36[理学—物理化学]