Probing into the crystal plane effect on the reduction of α-Fe<sub>2</sub>O<sub>3</sub> in CO by Operando Raman spectroscopy

LI Pei-xia; QU Long-mei; ZHANG Cai-hong; REN Xiao-bo; WANG Hui-xiang; ZHANG Jian-li; MU Yue-wen; LÜ Bao-liang

doi:10.1016/S1872-5813(21)60154-8

Volume 49 Issue 10

Oct. 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(10): 1558-1566

LI Pei-xia, QU Long-mei, ZHANG Cai-hong, REN Xiao-bo, WANG Hui-xiang, ZHANG Jian-li, MU Yue-wen, LÜ Bao-liang. Probing into the crystal plane effect on the reduction of α-Fe2O3 in CO by Operando Raman spectroscopy[J]. Journal of Fuel Chemistry and Technology, 2021, 49(10): 1558-1566. doi: 10.1016/S1872-5813(21)60154-8

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LI Pei-xia, QU Long-mei, ZHANG Cai-hong, REN Xiao-bo, WANG Hui-xiang, ZHANG Jian-li, MU Yue-wen, LÜ Bao-liang. Probing into the crystal plane effect on the reduction of α-Fe₂O₃ in CO by Operando Raman spectroscopy[J]. Journal of Fuel Chemistry and Technology, 2021, 49(10): 1558-1566. doi: 10.1016/S1872-5813(21)60154-8

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Probing into the crystal plane effect on the reduction of α-Fe₂O₃ in CO by Operando Raman spectroscopy

doi: 10.1016/S1872-5813(21)60154-8

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2.
Changzhi Comprehensive Inspection and Testing Center, Changzhi 046000, China
3.
State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China
4.
Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Institute of Molecular Science, Shanxi University, Taiyuan 030006, China

Funds: The project was supported by National Natural Science Foundation of China (21972158), Research Project Supported by Shanxi Scholarship Council of China (2020-196), Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (2021-K10), Shanxi Province Science Foundation for Youths (201901D211583) and the Doctoral Start-up Foundation of Shanxi Province (SQ2019006)

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Author Bio:
17836036277@139.com
Corresponding author: Tel: 0351-4063121, E-mail: ywmu@sxu.edu.cn; lbl604@sxicc.ac.cn
Received Date: 2021-03-24
Rev Recd Date: 2021-04-13

Available Online: 2021-09-03

Publish Date: 2021-10-30

Abstract

Abstract

For the Fe-based catalysts in Fischer-Tropsch synthesis, the reduction and activation process of α-Fe₂O₃ precursor has a significant effect on the catalytic performance. As a crystalline material, the reduction and activation of α-Fe₂O₃ is assuredly influenced by the exposed crystal plane; however, there is a lack of necessary research in this regard. In this work, α-Fe₂O₃ nanocrystals of three different morphologies, viz., pseudo-cubic, hexagonal-plate and rhombohedra, were synthesized, which mainly expose the crystal planes of (102), (001) and (104), respectively. The evolution of α-Fe₂O₃ crystal structure was then investigated in CO atmosphere by using the Operando Raman spectroscopy (ORS). The results show that the α-Fe₂O₃ (001) plane has a better reductive activity in comparison to the (104) and (102) planes. The SEM, TEM, XPS and XRD characterization and DFT calculation results reveal that CO₂ desorption is a decisive step for the reduction of α-Fe₂O₃; owing to the weak binding ability of (001) crystal plane to oxygen atoms, the desorption of CO₂ on the (001) crystal plane is much easier, which can promote the reduction process.
- α-Fe₂O₃,
- crystal planes,
- Operando Raman spectroscopy,
- reduction

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