文献类型：期刊文献

英文题名：Relationship between catalytic deactivation and physicochemical properties of LaMnO3 perovskite catalyst during catalytic oxidation of vinyl chloride

作者：Zhang, Chuanhui[1,2,3];Wang, Chao[1,2,3];Hua, Wenchao[1,2];Guo, Yanglong[1,2];Lu, Guanzhong[1,2];Gil, Sonia[3];Giroir-Fendler, Anne[3]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China;[3]Univ Lyon 1, Inst Rech Catalyse & Environm Lyon, CNRS, UMR 5256,IRCELYON, 2 Ave Albert Einstein, F-69626 Villeurbanne, France

年份：2016

卷号：186

起止页码：173

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;EI(收录号：20160401835446);WOS:【SCI-EXPANDED(收录号:WOS:000370305900018)】；

基金：This research was financially supported by National Basic Research Program of China (2013CB933200), National Natural Science Foundation of China (21577035), Commission of Science and Technology of Shanghai Municipality (15DZ1205305) and 111 Project (B08021). The authors would like to acknowledge the China Scholarship Council for the Joint-Training Scholarship Program with Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON) of Universite Claude Bernard Lyon 1 (UCBL1).

语种：英文

外文关键词：Deactivation; Vinyl chloride; LaMnO3; Perovskite; Physicochemical property

摘要：A LaMnO3 perovskite oxide catalyst prepared by co-precipitation was evaluated for vinyl chloride (VC) oxidation over consecutive catalytic cycles and in steady-state conditions. The LaMnO3 catalyst exhibited relatively poor catalytic stability and durability, with the amount of chlorinated organic species increasing as catalytic activity decreased. Physicochemical properties were characterized by X-ray diffraction (XRD), N-2 sorption, thermogravimetric and differential thermal analysis (TGA/DTA), energy disperse spectrocopy (EDS), hydrogen temperature-programmed reduction (H-2-TPR), oxygen temperature-programmed desorption (O-2-TPD) and X-ray photoelectron spectroscopy (XPS). Fresh and used catalysts presented a typical perovskite structure. No coke and only traces of residual chlorine species were detected on the used catalyst, indicating that coke formation and attack by chlorine were not the causes for deactivation. The used catalyst, however, presented lower specific surface area, low-temperature reducibility and surface oxygen mobility than the fresh one, suggesting that physicochemical and redox properties strongly influenced catalytic deactivation. Finally, a deactivation mechanism was proposed based on the Mn4+/Mn3+ redox cycle, and the formation of chlorinated by-products was inferred to be closely related to the presence of Cl species and catalyst deactivation. (C) 2016 Published by Elsevier B.V.