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Operando Spectroscopic Study of Dynamic Structure of Iron Oxide Catalysts during CO2 Hydrogenation
ChemCatChem ( IF 3.8 ) Pub Date : 2018-02-09 , DOI: 10.1002/cctc.201701779
Yulong Zhang 1 , Donglong Fu 1 , Xianglin Liu 1 , Zhengpai Zhang 1 , Chao Zhang 1 , Bianfang Shi 1 , Jing Xu 1 , Yi-Fan Han 1, 2
Affiliation  

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 (α‐Fe2O3 and γ‐Fe2O3) during activation and CO2 hydrogenation were elaborated, that is, α‐Fe2O3 (γ‐Fe2O3)→α‐Fe3O4 (γ‐Fe3O4)→α‐Fe (γ‐Fe)→χ‐Fe5C2 (θ‐Fe3C). Both iron carbides showed high catalytic activities while χ‐Fe5C2 exhibited higher selectivity to lower olefins but weaker chain growth probability than θ‐Fe3C.

中文翻译:

CO2加氢过程中氧化铁催化剂动力学结构的操作光谱研究

了解活性位点的动态结构对于合理设计工业催化剂至关重要。这项工作揭示了铁基催化剂上用于CO 2加氢的铁活性相的结构演变。与operando拉曼光谱和X-射线衍射的组合加上在线气相色谱法,铁的氧化物的全景结构演进(的α-Fe 2 ö 3和γ-的Fe 2 ö 3)激活期间和CO 2加氢进行了阐述,该是,的α-Fe 2 ö 3(γ-的Fe 2 ö 3)→α -铁3 ö 4(γ-的Fe 3Ò 4)→α -铁(γ-Fe)的→χ -铁5 Ç 2(θ-的Fe 3 C)。两个铁碳化物表现出较高的催化活性,而χ -铁5 c ^ 2表现出更高的选择性为低级烯烃而较弱的链增长概率比θ-的Fe 3 C.
更新日期:2018-02-09
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