title: Catalyst performance and mechanism of catalytic combustion of dichloromethane (CH2Cl2) over Ce doped TiO2.
abstract: TiO2 and Ce/TiO2 were synthesized and subsequently used for the catalytic combustion of DCM. TiO2 had abundant Lewis acid sites and was responsible for the adsorption and the rupture of C-Cl bonds. However, TiO2 tended to be inactivated because of chloride poisoning due to the adsorption and accumulation of Cl species over the surface. While, Ce/TiO2 obtained total oxidation of CH2Cl2 at 335°C and exhibited stable DCM removal activity on 100h long-time stability tests at 330°C without any catalyst deactivation. The doped cerium generated Ce(3+) chemical states and surface active oxygen, and therefore played important roles from two aspects as follows. First of all, the poisoning of Cl for Ce/TiO2 was inhibited to some extent by CeO2 due to the rapid removal of Cl on the surface of CeO2, which has been verified by NH3-IR characterization. In the other hand, CeO2 enhanced the further deep oxidation of C-H from byproducts and retained the certain oxidation of CO to CO2. Based on the DRIFT characterization and the catalysts activity tests, a two-step reaction pathway for the catalytic combustion of DCM on Ce/TiO2 catalyst was proposed.
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, PR China; Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, PR China.
authors.forename: Shuang
authors.initials: S
authors.lastname: Cao
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, PR China; Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, PR China. Electronic address: haiqiangwang@zju.edu.cn.
authors.forename: Haiqiang
authors.initials: H
authors.lastname: Wang
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, PR China; Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, PR China.
authors.forename: Feixiang
authors.initials: F
authors.lastname: Yu
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Mengpa
authors.initials: M
authors.lastname: Shi
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Shuang
authors.initials: S
authors.lastname: Chen
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, PR China; Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, PR China.
authors.forename: Xiaole
authors.initials: X
authors.lastname: Weng
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, PR China; Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, PR China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, PR China; Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, PR China.
authors.forename: Zhongbiao
authors.initials: Z
authors.lastname: Wu
keywords: Catalytic combustion; Ce/TiO(2); Chlorinated volatile organic compounds; Cl poisoning; Dichloromethane