Effect of Fe3O4 content on the CO2 selectivity of iron-based catalyst for Fischer-Tropsch synthesis

HAN Xiao; QING Ming; WANG Hong; YU Xin; SUO Hai-yun; SHEN Xian-feng; YANG Yong; LI Yong-wang

doi:10.1016/S1872-5813(22)60018-5

Volume 51 Issue 2

Jan. 2023

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Article Navigation > Journal of Fuel Chemistry and Technology > 2023 > 51(2): 155-164

HAN Xiao, QING Ming, WANG Hong, YU Xin, SUO Hai-yun, SHEN Xian-feng, YANG Yong, LI Yong-wang. Effect of Fe3O4 content on the CO2 selectivity of iron-based catalyst for Fischer-Tropsch synthesis[J]. Journal of Fuel Chemistry and Technology, 2023, 51(2): 155-164. doi: 10.1016/S1872-5813(22)60018-5

Citation:

HAN Xiao, QING Ming, WANG Hong, YU Xin, SUO Hai-yun, SHEN Xian-feng, YANG Yong, LI Yong-wang. Effect of Fe₃O₄ content on the CO₂ selectivity of iron-based catalyst for Fischer-Tropsch synthesis[J]. Journal of Fuel Chemistry and Technology, 2023, 51(2): 155-164. doi: 10.1016/S1872-5813(22)60018-5

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Effect of Fe₃O₄ content on the CO₂ selectivity of iron-based catalyst for Fischer-Tropsch synthesis

doi: 10.1016/S1872-5813(22)60018-5

HAN Xiao^{1, 2
,},
QING Ming³,
WANG Hong³,
YU Xin³,
SUO Hai-yun³,
SHEN Xian-feng^{1, 2},
YANG Yong^{1, 3
,
,},
LI Yong-wang^{1, 3}

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
National Energy Center for Coal to Liquids, Synfuels China Co. Ltd. , Beijing 101407, China

Received Date: 2022-03-07
Accepted Date: 2022-04-16
Rev Recd Date: 2022-03-25

Available Online: 2022-05-12

Publish Date: 2023-01-18

Abstract

Abstract

In this study, a series of catalysts with different Fe₃O₄ to iron carbide ratios were obtained by carburizing the α-Fe₂O₃ precursor prepared by co-precipitation method, under various carburization conditions. XRD, Mössbauer spectroscopy, XPS, and Raman spectroscopy were used to characterize the bulk and surface phase compositions of the Fe-based catalysts. The results show that increasing the carburization temperature and prolonging the carburization time lead to higher iron carbide concentration. To explore the active phase of CO₂ formation, the catalysts were tested under different reaction conditions by tuning either CO conversion or H₂O partial pressure. It turns out that the catalytic performance of the Fe-based catalyst in the FTS and water-gas shift (WGS) reactions is influenced by both the content of iron carbide and the degree of carbon deposition. Under typical Fischer-Tropsch reaction condition, the CO₂ selectivity is determined by the CO conversion rather than the Fe₃O₄ content in the catalyst, meaning that the WGS reaction is here limited by the kinetic factors. On the contrary, adding H₂O to the reaction gas results in the trend that higher CO₂ selectivity is promoted by higher content of Fe₃O₄ in the Fe-based catalyst. It seems that Fe₃O₄ is the main active phase for the WGS reaction in the iron-based catalyst for FTS. These results provide a new insight into the active phase of CO₂ generation on the Fe-based catalysts, which could be the theoretical basis for the design of new industrial FTS catalysts with low CO₂ selectivity.
- Fischer-Tropsch synthesis,
- iron-based catalyst,
- Fe₃O₄,
- CO₂ selectivity,
- WGS reaction

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References(29)

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