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Environ Sci Technol

Title:		Catalytic Oxidation of Chlorobenzene over Mn(x)Ce(1-x)O(2)/HZSM-5 Catalysts: A Study with Practical Implications
Author(s):		Weng X; Sun P; Long Y; Meng Q; Wu Z;
Address:		"Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Natural Resources and Environmental Science, Zhejiang University , 310058 Hangzhou, P. R. China. Zhejiang Provincial Engineering Research Centre of Industrial Boiler & Furnace Flue Gas Pollution Control, 388 Yuhangtang Road, 310058 Hangzhou, P. R. China"
Journal Title:		Environ Sci Technol
Year:		2017
Volume:		20170630
Issue:		14
Page Number:		8057 - 8066
DOI:		10.1021/acs.est.6b06585
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Industrial-use catalysts usually encounter severe deactivation after long-term operation for catalytic oxidation of chlorinate volatile organic compounds (CVOCs), which becomes a 'bottleneck' for large-scale application of catalytic combustion technology. In this work, typical acidic solid-supported catalysts of Mn(x)Ce(1-x)O(2)/HZSM-5 were investigated for the catalytic oxidation of chlorobenzene (CB). The activation energy (E(a)), Bronsted and Lewis acidities, CB adsorption and activation behaviors, long-term stabilities, and surficial accumulation compounds (after aging) were studied using a range of analytical techniques, including XPS, H(2)-TPR, pyridine-IR, DRIFT, and O(2)-TP-Ms. Experimental results revealed that the Bronsted/Lewis (B/L) ratio of Mn(x)Ce(1-x)O(2)/HZSM-5 catalysts could be adjusted by ion exchange of H* (in HZSM-5) with Mn(n+) (where the exchange with Ce(4+) did not distinctly affect the acidity); the long-term aged catalysts could accumulate ca. 14 organic compounds at surface, including highly toxic tetrachloromethane, trichloroethylene, tetrachloroethylene, o-dichlorobenzene, etc.; high humid operational environment could ensure a stable performance for Mn(x)Ce(1-x)O(2)/HZSM-5 catalysts; this was due to the effective removal of Cl* and coke accumulations by H(2)O washing, and the distinct increase of Lewis acidity by the interaction of H(2)O with HZSM-5. This work gives an in-depth view into the CB oxidation over acidic solid-supported catalysts and could provide practical guidelines for the rational design of reliable catalysts for industrial applications"
Keywords:		Adsorption Catalysis Chlorobenzenes/*chemistry Oxidation-Reduction;
Notes:		"MedlineWeng, Xiaole Sun, Pengfei Long, Yu Meng, Qingjie Wu, Zhongbiao eng 2017/06/16 Environ Sci Technol. 2017 Jul 18; 51(14):8057-8066. doi: 10.1021/acs.est.6b06585. Epub 2017 Jun 30"