期刊
CHINESE JOURNAL OF CATALYSIS
卷 38, 期 8, 页码 1406-1412出版社
SCIENCE PRESS
DOI: 10.1016/S1872-2067(17)62863-8
关键词
LaMnO3; Vinyl chloride; Catalytic combustion; Low temperature; Preparation method
资金
- National Basic Research Program of China [2013CB933201]
- National Natural Science Foundation of China [21207037, 21577035]
- Commission of Science and Technology of Shanghai Municipality [15DZ1205305]
LaMnO3 was prepared by citrate sol-gel, coprecipitation, hard template, and hydrothermal methods, respectively, and its catalytic performance for the combustion of vinyl chloride was investigated. N-2 adsorption-desorption, X-ray diffraction (XRD), Raman spectroscopy (Raman), Oz temperature programmed desorption (O-2-TPD), H-2 temperature programmed surface reaction (H-2-TPR) and X-ray photoelectron spectroscopy (XPS) were used to characterize the physicochemical properties of the LaMnO3 samples. The preparation methods had obvious effects on the distribution of oxygen and manganese species on the catalyst surface. The reaction followed the suprafacial mechanism; the activity corresponded with the high amount of Mn4+ and adsorbed oxygen species. LaMnO3 prepared by the citrate sol-gel method had the best performance for vinyl chloride combustion with T90 of 182 degrees C. The optimal activity was attributed to the improved redox capability of Mn4+/Mn3+. More available adsorbed oxygen and Mn4+ species on the surface were mainly responsible for the remarkable enhancement of the catalytic activity. (C) 2017, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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