Citation: Jing-yuan FAN, Zhen-gang LÜ, Cheng-hua ZHANG, Jian XU, Hong-wei XIANG. Study on size effect of γ-Fe₂O₃ nanoparticles and gas atmosphere on carburization process[J]. Journal of Fuel Chemistry and Technology, ;2022, 50(2): 218-226. doi: 10.1016/S1872-5813(21)60157-3 shu

Study on size effect of γ-Fe₂O₃ nanoparticles and gas atmosphere on carburization process

Jing-yuan FAN ^{1, 2,} ,
Zhen-gang LÜ ³ ,
Cheng-hua ZHANG ^{1, 3} ,
Jian XU ^3,, ,
Hong-wei XIANG ^{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

Corresponding author: Jian XU, xujian@synfuelschina.com.cn
Received Date: 8 July 2021
Revised Date: 21 August 2021

Figures(16)

Different sizes of γ-Fe₂O₃ nanoparticles (4−19 nm) were prepared by thermal decomposition of iron oleate and carburized in three different gas atmosphere of 5%CO/He, 5%CO/10%H₂/He and 5%CO/20%H₂/He at 350 ℃. The carburization process and phase transformation of γ-Fe₂O₃ nanoparticles were investigated by in situ XRD, Raman spectroscopy, CO-TPR and TEM. The results showed that χ-Fe₅C₂ and θ-Fe₃C phases with a stable ratio were formed after carburization. The time to complete carburization was shortened for increasing sizes of γ-Fe₂O₃ particles under the same carburization atmosphere. While the smaller γ-Fe₂O₃ particles showed more residual carbon on the surface, which could inhibit the carburization process. The relative content of θ-Fe₃C increased with the increase of the size of γ-Fe₂O₃ nanoparticles. For γ-Fe₂O₃ nanoparticles with the same sizes, the time to complete carburization in different atmospheres was firstly shortened and then slightly lengthened with the increase of H₂ partial pressure, while the relative content of θ-Fe₃C increased with the increase of H₂ partial pressure. By adjusting the particle size of γ-Fe₂O₃ and the carburization atmosphere, the mixed phases of χ-Fe₅C₂ and θ-Fe₃C can be optimized.
- γ-Fe₂O₃ nanoparticle,
- in situ XRD,
- carburization,
- phase transformation
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Study on size effect of γ-Fe₂O₃ nanoparticles and gas atmosphere on carburization process