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

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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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