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J Colloid Interface Sci

Title:		Catalyst performance and mechanism of catalytic combustion of dichloromethane (CH2Cl2) over Ce doped TiO2
Author(s):		Cao S; Wang H; Yu F; Shi M; Chen S; Weng X; Liu Y; Wu Z;
Address:		"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. 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. Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, PR China"
Journal Title:		J Colloid Interface Sci
Year:		2016
Volume:		20151026
Issue:
Page Number:		233 - 241
DOI:		10.1016/j.jcis.2015.10.061
ISSN/ISBN:		1095-7103 (Electronic) 0021-9797 (Linking)
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 degrees C and exhibited stable DCM removal activity on 100h long-time stability tests at 330 degrees 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"
Keywords:		Catalytic combustion Ce/TiO(2) Chlorinated volatile organic compounds Cl poisoning Dichloromethane;
Notes:		"PubMed-not-MEDLINECao, Shuang Wang, Haiqiang Yu, Feixiang Shi, Mengpa Chen, Shuang Weng, Xiaole Liu, Yue Wu, Zhongbiao eng 2015/11/10 J Colloid Interface Sci. 2016 Feb 1; 463:233-41. doi: 10.1016/j.jcis.2015.10.061. Epub 2015 Oct 26"