Charge-redistribution-induced new active sites on (001) facets of α-Mn2O3 for significantly enhanced selective catalytic reduction of NOx by NH3

被引：61

作者：

Fan, Zhaoyang ^{[1
]}

Wang, Zhenyu ^{[1
,2
,3
]}

Shi, Jian-Wen ^{[1
]}

Gao, Chen ^{[1
]}

Gao, Ge ^{[1
]}

Wang, Baorui ^{[1
]}

Wang, Yao ^{[1
]}

Chen, Xin ^{[1
]}

He, Chi ^{[4
]}

Niu, Chunming ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, Sch Elect Engn, Ctr Nanomat Renewable Energy, State Key Lab Elect Insulat & Power Equipment, Xian 710049, Shaanxi, Peoples R China

[2] UCL, Kathleen Lonsdale Mat Chem, Dept Chem, 20 Gordon St, London WC1H 0AJ, England

[3] UCL, Thomas Young Ctr, Gower St, London WC1E 6BT, England

[4] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Dept Environm Sci & Engn, Xian 710049, Shaanxi, Peoples R China

来源：

JOURNAL OF CATALYSIS | 2019年 / 370卷

关键词：

Selective catalytic reduction; alpha-Mn2O3; Crystal facets; De-NOx; Density functional theory; LOW-TEMPERATURE SCR; EFFICIENT CATALYST; SURFACE-STRUCTURE; DOPED MN/TIO2; CO OXIDATION; OXIDE; PERFORMANCE; TIO2; IRON; DECOMPOSITION;

D O I：

10.1016/j.jcat.2018.12.001

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：

Crystal facets usually play an important role in the catalytic activity of inorganic single crystals. In this work, two alpha-Mn2O3 single crystals with an octahedron (exposed with (1 1 1) facet) and a truncated octahedron (exposed with both (1 1 1) and (0 01) facets) were successfully prepared by a simple solvent thermal reaction, and their catalytic activities were evaluated by the selective catalytic reduction (SCR) of NOx with NH3. The results show that the catalytic performance of the alpha-Mn2O3 single crystal with a truncated octahedron was enhanced in comparison with the alpha-Mn2O3 single crystal with an octahedron by the exposure of a small fraction of (0 01) facets. This can be attributed to the new active sites created by charge redistribution on the surface of the (0 0 1) facets, which provides more adsorption sites, facilitating the further adsorption and reaction of NH3 and NO molecules, and thereby enhancing the catalytic performance. This work should provide new insight into the understanding of crystal-facet-dependent reactivity and important guides for the design and preparation of SCR catalysts with high activity. (C) 2018 Elsevier Inc. All rights reserved.

引用

页码：30 / 37

页数：8

共 46 条

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