文献类型：期刊文献

英文题名：Operando Spectroscopic Study of Dynamic Structure of Iron Oxide Catalysts during CO2 Hydrogenation

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

年份：2018

卷号：10

期号：6

起止页码：1272

外文期刊名：CHEMCATCHEM

收录：;EI(收录号：20180704790054);WOS:【SCI-EXPANDED(收录号:WOS:000428375400010)】；

基金：The authors are grateful to the support from the National Science Foundation (21576084, 91534127 and 21406062), Fundamental Research Funds for the Central Universities (222201718002) and Chinese Education Ministry 111 project (B08021).

语种：英文

外文关键词：CO2; hydrogenation; iron carbides; operando techniques; structure evolution

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.