Citation: Bingyang Bai, Qi Qiao, Yanping Li, Yue Peng, Junhua Li. Effect of pore size in mesoporous MnO₂ prepared by KIT-6 aged at different temperatures on ethanol catalytic oxidation[J]. Chinese Journal of Catalysis, ;2018, 39(4): 630-638. doi: 10.1016/S1872-2067(18)63036-0 shu

Effect of pore size in mesoporous MnO₂ prepared by KIT-6 aged at different temperatures on ethanol catalytic oxidation

Bingyang Bai ^a,b, ,
Qi Qiao ^a,b ,
Yanping Li ^b ,
Yue Peng ^c ,
Junhua Li ^c

a State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
b Key Laboratory of Eco-Industry of the Ministry of Ecological Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
c State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China

Received Date: 23 December 2017
Revised Date: 25 January 2018

Fund Project: This work was supported by the National Key Research and Development Program Foundation of China (2016YFC0209203) and the National Natural Science Foundation of China (21707130, 21325731).

KIT-6 mesoporous silica aged at 40, 100, and 150℃ were used as hard templates to prepare different mesoporous MnO₂ catalysts, marked as Mn-40, Mn-100, and Mn-150, respectively. The catalytic activities of these catalysts and the effect of pore sizes on ethanol catalytic oxidation were investigated. Mn-40, Mn-100, and Mn-150 have triple, double, and single pore systems, respectively. On decreasing the aging temperature of KIT-6, the pore sizes of KIT-6 decrease and that of mesoporous MnO₂ catalysts increase. The pore sizes and catalytic activities increase in the order:Mn-40 > Mn-100 > Mn-150. Mn-40 catalyst has a higher TOF (0.11 s^-1 at 120℃) and the best catalytic activity for ethanol oxidation because of a bigger pore size with three pore systems with maximum distribution at 1.9, 3.4, and 6.6 nm, decrease in symmetry and degree of order, more surface lattice oxygen species, oxygen vacancies resulting from more Mn³⁺ ions, and better low-temperature reducibility.
- Mesoporous MnO₂,
- Pore channel,
- KIT-6 mesoporous silica,
- Catalytic activity,
- Ethanol oxidation
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通讯作者: 陈斌, bchen63@163.com

Effect of pore size in mesoporous MnO₂ prepared by KIT-6 aged at different temperatures on ethanol catalytic oxidation