Catalytic oxidation of chlorinated volatile organic compounds over Mn-Ti composite oxides catalysts: Elucidating the influence of surface acidity

被引：120
|
作者：
Liu, Hao [1 ,2 ]
Li, Xian [1 ,2 ]
Dai, Qiguang [1 ,2 ]
Zhao, Hailin [1 ,2 ]
Chai, Guangtao [1 ,2 ]
Guo, Yanglong [1 ,2 ]
Guo, Yun [1 ,2 ]
Wang, Li [1 ,2 ]
Zhan, Wangcheng [1 ,2 ,3 ]
机构：
[1] East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China
[2] East China Univ Sci & Technol, Sch Chem & Mol Engn, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China
[3] East China Univ Sci & Technol, Frontiers Sci Ctr Mat & Dynam Chem, Shanghai 200237, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2021年 / 282卷 / 282期
基金：
中国国家自然科学基金;
关键词：
Composite metal oxides; Surface acidity; Reducibility; Chlorinated volatile organic compounds; Catalytic oxidation; LOW-TEMPERATURE; STRUCTURAL-PROPERTIES; MANGANESE OXIDES; LEWIS-ACID; COMBUSTION; PERFORMANCE; MECHANISM; 1,2-DICHLOROETHANE; DICHLOROMETHANE; REDUCTION;
D O I：
10.1016/j.apcatb.2020.119577
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A series of Mn-Ti composite oxides (MnyTi1-yOx) were prepared via the sol-gel method, and their reducibility and surface acidity were controlled by adjusting the Mn/Ti molar ratio. In addition, as a model reaction, the catalytic activity of Mn-Ti composite oxides for the deep oxidation of vinyl chloride (VC) was evaluated. It was found that the catalyst surface acidity played a decisive role in the oxidation of VC, on the condition that the catalyst reducibility was superior to that of Mn0.4Ti0.6Ox. Consequently, a linear relationship between the surface acidity of the MnyTi1-yOx catalysts (y >= 0.4) and the reaction rate of the VC oxidation process was observed. Moreover, the influence of Lewis acidic sites originating from Ti species on the catalytic activity of the MnyTi1-yOx catalysts was revealed. These results could lead to an efficient strategy for enhancing the CVOC oxidation reaction through finely tuning reducibility and surface acidity of the catalyst.
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页数：9
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