Effect of Na promoter and reducing atmosphere on phase evolution of Fe-based catalyst and its CO<sub>2</sub> hydrogenation performance

LIANG Jie; WANG Xin-yu; GAO Xin-hua; TIAN Ju-mei; DUAN Bin; ZHANG Wei; JIANG Yong-jun; Prasert Reubroycharoen; ZHANG Jian-li; ZHAO Tian-sheng

doi:10.1016/S1872-5813(22)60060-4

Volume 50 Issue 12

Dec. 2022

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Article Navigation > Journal of Fuel Chemistry and Technology > 2022 > 50(12): 1573-1580

LIANG Jie, WANG Xin-yu, GAO Xin-hua, TIAN Ju-mei, DUAN Bin, ZHANG Wei, JIANG Yong-jun, Prasert Reubroycharoen, ZHANG Jian-li, ZHAO Tian-sheng. Effect of Na promoter and reducing atmosphere on phase evolution of Fe-based catalyst and its CO2 hydrogenation performance[J]. Journal of Fuel Chemistry and Technology, 2022, 50(12): 1573-1580. doi: 10.1016/S1872-5813(22)60060-4

Citation:

LIANG Jie, WANG Xin-yu, GAO Xin-hua, TIAN Ju-mei, DUAN Bin, ZHANG Wei, JIANG Yong-jun, Prasert Reubroycharoen, ZHANG Jian-li, ZHAO Tian-sheng. Effect of Na promoter and reducing atmosphere on phase evolution of Fe-based catalyst and its CO₂ hydrogenation performance[J]. Journal of Fuel Chemistry and Technology, 2022, 50(12): 1573-1580. doi: 10.1016/S1872-5813(22)60060-4

Citation:

LIANG Jie, WANG Xin-yu, GAO Xin-hua, TIAN Ju-mei, DUAN Bin, ZHANG Wei, JIANG Yong-jun, Prasert Reubroycharoen, ZHANG Jian-li, ZHAO Tian-sheng. Effect of Na promoter and reducing atmosphere on phase evolution of Fe-based catalyst and its CO₂ hydrogenation performance[J]. Journal of Fuel Chemistry and Technology, 2022, 50(12): 1573-1580. doi: 10.1016/S1872-5813(22)60060-4

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Effect of Na promoter and reducing atmosphere on phase evolution of Fe-based catalyst and its CO₂ hydrogenation performance

doi: 10.1016/S1872-5813(22)60060-4

LIANG Jie^1
,,
WANG Xin-yu^1
,,
GAO Xin-hua^{1, 2
,
,},
TIAN Ju-mei^3
,,
DUAN Bin^3
,,
ZHANG Wei^2
,,
JIANG Yong-jun^{1, 2
,},
Prasert Reubroycharoen^4
,,
ZHANG Jian-li^{1
,
,},
ZHAO Tian-sheng^1
,

1.
State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
2.
Institute of Coal Chemical Industry Technology, National Energy Group Ningxia Coal Industry Co., Ltd., Yinchuan 750411, China
3.
Ningxia Academy of Metrology & Quality Inspection, National Quality Supervision and Inspection Center for Coal and Coal Chemical Products (Ningxia), Yinchuan 750200, China
4.
Center of Excellence in Catalysis for Bioenergy and Renewable Chemicals (CBRC), and Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand

Funds: The project was supported by the National Natural Science Foundation of China (21965029), the Natural Science Foundation of Ningxia (2022AAC03040), the Fourth Batch of Ningxia Youth Talents Supporting Program (TJGC2019022) and West Light Foundation of the Chinese Academy of Sciences (XAB2019AW02), and the Graduate Innovation Program of Ningxia University (GIP2021013).

Received Date: 2022-05-28
Accepted Date: 2022-06-30
Rev Recd Date: 2022-06-23

Available Online: 2022-09-09

Publish Date: 2022-12-28

Abstract

Abstract

Although alkali metal promoters have a considerable effect on the product distribution of CO₂ hydrogenation over Fe-based catalysts, the mechanism of the active phase transformation is uncertain. The effects of Na modification and pretreatment atmosphere on phase evolution of Fe₂O₃ sample and the synergistic effect between iron oxides and carbides were investigated using in-situ X-ray diffraction ( in-situ XRD). The physiochemical properties of catalyst were characterized by H₂-TPR and CO+H₂-TPSR-MS. When the reducing environment is H₂, Na promoter inhibited the reduction of Fe₂O₃. However, when the reducing atmosphere is syngas (CO/H₂ = 1:2), a suitable amount of Na promoter decreased the reduction and activation temperatures, and increased the iron carbide concentration. The selectivity of light olefins increased from 0.3% to 20.2%, and CO₂ conversion increased from 7.3% to 25.8% when syngas was used as the reducing gas compared to using H₂ as the reducing gas. Compared with pure Fe₂O₃, the CH₄ selectivity of Na modified Fe₂O₃ decreased from 43.2% to 14.9%, while the selectivity of C₅₊ increased from 7.8% to 37.0%, owing to the fact that the Fe₅C₂ content increased from 8.5% to 38.4%. The ratio of Fe₃O₄ to Fe₅C₂ in the catalyst could be effectively controlled by changing the reducing atmosphere and the amount of Na promoter, thereby improving the CO₂ hydrogenation activity and target product selectivity.
- in-situ XRD,
- Fe-based catalyst,
- Na-promoter,
- reducing atmosphere,
- phases evolution

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References(30)

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