Active Tetrahedral Iron Sites of γ-Fe2O3 Catalyzing NO Reduction by NH3

被引：64

作者：

Qu, Weiye ^{[1
]}

Chen, Yaxin ^{[1
]}

Huang, Zhiwei ^{[1
]}

Gao, Jiayi ^{[1
]}

Zhou, Meijuan ^{[1
]}

Chen, Junxiao ^{[1
]}

Li, Chao ^{[1
]}

Ma, Zhen ^{[1
]}

Chen, Jianmin ^{[1
]}

Tang, Xingfu ^{[1
,2
]}

机构：

[1] Fudan Univ, Shanghai Key Lab Atmospher Particle Pollut & Prev, Inst Atmospher Sci, Dept Environm Sci & Engn, Shanghai 200433, Peoples R China

[2] Nanjing Univ Informat Sci & Technol, Jiangsu Collaborat Innovat Ctr Atmospher Environm, Nanjing 210044, Jiangsu, Peoples R China

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS | 2017年 / 4卷 / 06期

关键词：

SELECTIVE CATALYTIC-REDUCTION; GENERALIZED GRADIENT APPROXIMATION; NITRIC-OXIDE; NITROGEN-OXIDE; METAL-OXIDES; AMMONIA; MECHANISM; SPINEL; NANOPARTICLES; ALPHA-FE2O3;

D O I：

10.1021/acs.estlett.7b00124

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Maghemite (gamma-Fe2O3) with a spinel structure, consisting of tetrahedral Fe3+ (Fe-Td(3+)) and octahedral Fe3+ (Fe-oh(3+)) sites, has been intensively investigated as an environmentally benign catalyst for selective catalytic reduction (SCR) of NOx with NH3. In most cases, Fe-Oh(3+), sites were regarded as catalytically active sites (CASs). Here we identify the CASs in SCR by substituting Fe-oh(3+) or Fe-Td(3+) sites of gamma-Fe2O3 with catalytically inactive Ti4+ or Zn2+, respectively. The SCR activity of gamma-Fe2O3 is preserved after Ti4+ doping but drastically decreases when the catalyst is doped with Zn2+, demonstrating that Fe-Td(3+) sites serve as CASs in SCR.

引用

页码：246 / 250

页数：5

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[1] PROJECTOR AUGMENTED-WAVE METHOD [J].