Operando Spectroscopic Study of Dynamic Structure of Iron Oxide Catalysts during CO2 Hydrogenation

被引：106

作者：

Zhang, Yulong ^{[1
]}

Fu, Donglong ^{[1
]}

Liu, Xianglin ^{[1
]}

Zhang, Zhengpai ^{[1
]}

Zhang, Chao ^{[1
]}

Shi, Bianfang ^{[1
]}

Xu, Jing ^{[1
]}

Han, Yi-Fan ^{[1
,2
]}

机构：

[1] East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

[2] Zhengzhou Univ, Res Ctr Heterogeneous Catalysis & Engn Sci, Sch Chem Engn & Energy, Zhengzhou 450007, Henan, Peoples R China

来源：

CHEMCATCHEM | 2018年 / 10卷 / 06期

基金：

美国国家科学基金会;

关键词：

CO2; hydrogenation; iron carbides; operando techniques; structure evolution; FISCHER-TROPSCH SYNTHESIS; CARBON-NEUTRAL FUELS; X-RAY-DIFFRACTION; RAMAN-SPECTROSCOPY; GAMMA-FE2O3; NANOPARTICLES; ACTIVE PHASE; DIOXIDE; GAS; HYDROCARBONS; SELECTIVITY;

D O I：

10.1002/cctc.201701779

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：

Understanding of dynamic structure of active sites is of paramount importance for rational design of industrial catalysts. This work revealed the structure evolution of iron active phases for CO2 hydrogenation over iron-based catalysts. With a combination of operando Raman spectroscopy and X-ray Diffraction coupled with online gas chromatography, the panoramic structure evolution of iron oxides (alpha-Fe2O3 and gamma-Fe2O3) during activation and CO2 hydrogenation were elaborated, that is, alpha-Fe2O3 (gamma-Fe2O3)->alpha-Fe3O4 (gamma-Fe3O4)->alpha-Fe (gamma-Fe)->chi-Fe5C2 (theta-Fe3C). Both iron carbides showed high catalytic activities while chi-Fe5C2 exhibited higher selectivity to lower olefins but weaker chain growth probability than theta-Fe3C.

引用

页码：1272 / 1276

页数：5

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