High Activity of Au/γ-Fe2O3 for CO Oxidation: Effect of Support Crystal Phase in Catalyst Design

被引：136

作者：

Zhao, Kunfeng ^{[1
,2
,3
]}

Tang, Hailian ^{[1
,2
,3
,4
]}

Qiao, Botao ^{[1
]}

Li, Lin ^{[1
]}

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

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

[2] Chinese Acad Sci, Dalian Inst Chem Phys, Mossbauer Effect Data Ctr, Dalian 116023, Peoples R China

[3] Chinese Acad Sci, Dalian Inst Chem Phys, Lab Catalysts & New Mat Aerosp, Dalian 116023, Peoples R China

[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

ACS CATALYSIS | 2015年 / 5卷 / 06期

基金：

中国国家自然科学基金;

关键词：

gold; CO oxidation; redox; gamma-Fe2O3; catalyst design; SINGLE-ATOM CATALYSIS; GAS SHIFT REACTION; LOW-TEMPERATURE; GOLD CATALYSTS; CARBON-MONOXIDE; SELECTIVE OXIDATION; FERRIC HYDROXIDE; OXIDE NANOPARTICLES; GROUP METALS; OXYGEN;

D O I：

10.1021/cs5020496

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：

Au/gamma-Fe2O3 and Au/alpha-Fe2O3 catalysts with identical size of Au nanoparticles, chemical state of Au species, and amount of surface OW group were prepared. The Au/gamma-Fe2O3 catalyst exhibited exceptionally high activity, regardless of the heat treatments. The COTPR, sequential pulse reaction, and in situ Raman spectra demonstrate that the much higher activity of Au/gamma-Fe2O3 originated from its higher redox property at low temperature. Systematic study shows that this higher-redox-property-based higher activity could be extended to gamma-Fe2O3-supported Pt-group metals and to other reactions that follow Mars-Van Krevelen mechanism. This finding may provide a new avenue for catalyst improvement or development by choosing the suitable crystal phase of the oxide support.

引用

页码：3528 / 3539

页数：12

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