title: Promoting effect of vanadium on catalytic activity of Pt/Ce-Zr-O diesel oxidation catalysts.
abstract: 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, H2 temperature-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.
authors.affiliation: College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Huang
authors.affiliation: College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Jiang
authors.affiliation: College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Gu
authors.affiliation: College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
authors.forename: Zhonghua
authors.initials: Z
authors.lastname: Qi
authors.affiliation: Research Institute of Catalytic Reaction Engineering, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China. Electronic address: luhf@zjut.edu.cn.
authors.forename: Hanfeng
authors.initials: H
authors.lastname: Lu
mesh_terms: D002384:Catalysis; D002563:Cerium / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D010087:Oxides / Q000737:chemistry*; D017671:Platinum Compounds / Q000737:chemistry; D013455:Sulfur / Q000737:chemistry; D014639:Vanadium / Q000737:chemistry; D001335:Vehicle Emissions / Q000032:analysis*; D015040:Zirconium / Q000737:chemistry
chemical_list: D008670:Metals; D010087:Oxides; D017671:Platinum Compounds; D001335:Vehicle Emissions; D014639:Vanadium; D002563:Cerium; D013455:Sulfur; D015040:Zirconium
keywords: Catalytic performance; Diesel oxidation converter (DOC); Pt–V/Ce–Zr–O; Sulfur resistance; Vanadium