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Operando Spectroscopic Study of Dynamic Structure of Iron Oxide Catalysts during CO 2 Hydrogenation
Author(s) -
Zhang Yulong,
Fu Donglong,
Liu Xianglin,
Zhang Zhengpai,
Zhang Chao,
Shi Bianfang,
Xu Jing,
Han YiFan
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201701779
Subject(s) - catalysis , carbide , raman spectroscopy , selectivity , oxide , iron oxide , materials science , inorganic chemistry , chemistry , metallurgy , organic chemistry , physics , optics
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 CO 2 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‐Fe 2 O 3 and γ‐Fe 2 O 3 ) during activation and CO 2 hydrogenation were elaborated, that is, α‐Fe 2 O 3 (γ‐Fe 2 O 3 )→α‐Fe 3 O 4 (γ‐Fe 3 O 4 )→α‐Fe (γ‐Fe)→χ‐Fe 5 C 2 (θ‐Fe 3 C). Both iron carbides showed high catalytic activities while χ‐Fe 5 C 2 exhibited higher selectivity to lower olefins but weaker chain growth probability than θ‐Fe 3 C.