Study on size effect of γ-Fe<sub>2</sub>O<sub>3</sub> nanoparticles and gas atmosphere on carburization process

FAN Jing-yuan; LÜ Zhen-gang; ZHANG Cheng-hua; XU Jian; XIANG Hong-wei

doi:10.1016/S1872-5813(21)60157-3

Volume 50 Issue 2

Feb. 2022

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Article Navigation > Journal of Fuel Chemistry and Technology > 2022 > 50(2): 218-226

FAN Jing-yuan, LÜ Zhen-gang, ZHANG Cheng-hua, XU Jian, XIANG Hong-wei. 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

Citation:

FAN Jing-yuan, LÜ Zhen-gang, ZHANG Cheng-hua, XU Jian, XIANG Hong-wei. 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

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

doi: 10.1016/S1872-5813(21)60157-3

FAN Jing-yuan^{1, 2
,},
LÜ Zhen-gang³,
ZHANG Cheng-hua^{1, 3},
XU Jian^{3
,
,},
XIANG Hong-wei^{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

Funds: The project was supported by National Natural Science Foundation of China (91545109)

Received Date: 2021-07-08
Rev Recd Date: 2021-08-21

Available Online: 2021-09-19

Publish Date: 2022-02-12

Abstract

Abstract

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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References(21)

References

[1]	VAN STEEN E, CLAEYS M. Fischer-Tropsch catalysts for the biomass to liquid process[J]. Chem Eng Technol,2008,31(5):655−666. doi: 10.1002/ceat.200800067
[2]	YANG Y, XU J, LIU Z Y, GUO Q, YE M, WANG G, GAO J, WANG J, ZHU Z, GE W, LIU Z, WANG F, LI Y. Progress in coal chemical technologies of China[J]. Rev Chem Eng,2020,36(1):21−66.
[3]	温晓东, 杨勇, 相宏伟, 焦海军, 李永旺. 费托合成铁基催化剂的设计基础: 从理论走向实践[J]. 中国科学:化学,2017,47(11):1298−1311. doi: 10.1360/N032017-00111 WEN Xiao-dong, YANG Yong, XIANG Hong-wei, JIAO Hai-jun, LI Yong-wang. The design principle of iron-based catalysts for fischer-tropsch synthesis: from theory to practice[J]. Sci Sin Chim,2017,47(11):1298−1311. doi: 10.1360/N032017-00111
[4]	DICTOR R A, BELL A T. Fischer-Tropsch synthesis over reduced and unreduced iron-oxide catalysts[J]. J Catal,1986,97(1):121−136. doi: 10.1016/0021-9517(86)90043-6
[5]	TORRES GALVIS H M, BITTER J H, KHARE C B, RUITENBEEK M, DUGULAN A L, DE JONG K P. Supported iron nanoparticles as catalysts for sustainable production of lower olefins[J]. Science,2012,335(6070):835−838. doi: 10.1126/science.1215614
[6]	定明月, 杨勇, 相宏伟, 李永旺. 费托合成Fe基催化剂中铁物相与活性的关系[J]. 催化学报,2010,31(9):1145−1150. DING Ming-yue, YANG Yong, XIANG Hong-wei, LI Yong-wang. Relationship between iron phase and activity of iron-based Fischer-Tropsch synthesis catalyst[J]. Chin J Catal,2010,31(9):1145−1150.
[7]	BIAN G Z, OONUKI A, KOIZUMI N, NOMOTO H, YAMADA M. Studies with a precipitated iron Fischer-Tropsch catalyst reduced by H₂ or CO[J]. J Mol Catal A: Chem,2002,186(1/2):203−213. doi: 10.1016/S1381-1169(02)00186-3
[8]	YANG C, ZHAO H, HOU Y, MA D. Fe₅C₂ nanoparticles: A facile bromide-induced synthesis and as an active phase for Fischer-Tropsch synthesis[J]. J Am Chem Soc,2012,134(38):15814−15821. doi: 10.1021/ja305048p
[9]	MA C, ZHANG W, CHANG Q, WANG X, WANG H, CHEN H, WEI Y, ZHANG C, XIANG H, YANG Y, LI Y. θ-Fe₃C dominated Fe@C core-shell catalysts for Fischer-Tropsch synthesis: roles of θ-Fe₃C and carbon shell[J]. J Catal,2021,393:238−246. doi: 10.1016/j.jcat.2020.11.033
[10]	LO J M H, ZIEGLER T. Density functional theory and kinetic studies of methanation on iron surface[J]. J Phys Chem C,2007,111(29):11012−11025. doi: 10.1021/jp0722206
[11]	PARK J, AN K J, HWANG Y S, PARK J G, NOH H J, KIM J Y, PARK J H, HWANG N M, HYEON T W. Ultra-large-scale syntheses of monodisperse nanocrystals[J]. Nat Mater,2004,3(12):891−895. doi: 10.1038/nmat1251
[12]	YU W W, FALKNER J C, YAVUZ C T, COLVIN V L. Synthesis of monodisperse iron oxide nanocrystals by thermal decomposition of iron carboxylate salts[J]. Chem Commun,2004,20:2306−2307.
[13]	KIM B H, LEE N, KIM H, AN K, PARK Y I, CHOI Y, SHIN K, LEE Y, KWON S G, NA H B, PARK J G, AHN T Y, KIM Y W, MOON W K, CHOI S H, HYEON T. Large-scale synthesis of uniform and extremely small-sized iron oxide nanoparticles for high-resolution T₁ magnetic resonance imaging contrast agents[J]. J Am Chem Soc,2011,133(32):12624−12631. doi: 10.1021/ja203340u
[14]	郭天雨, 刘粟侥, 青明, 冯景丽, 吕振刚, 王洪, 杨勇. 原位XRD反应装置下H₂O对Fe₅C₂的物相及F-T反应性能影响的研究[J]. 燃料化学学报,2020,48(1):75−82. doi: 10.3969/j.issn.0253-2409.2020.01.009 GUO Tian-yu, LIU Su-yao, QING Ming, FENG Jing-li, LV Zhen-gang, WANG Hong, YANG Yong. In situ XRD study of the effect of H₂O on Fe₅C₂ phase and Fischer-Tropsch performance[J]. J Fuel Chem Technol,2020,48(1):75−82. doi: 10.3969/j.issn.0253-2409.2020.01.009
[15]	LI C, STAIR P C. An advance in Raman studies of catalysts: Ultraviolet resonance Raman spectroscopy[J]. Stud Surf Sci Catal,1996,101:881−890.
[16]	BUTOVSKY E, PERELSHTEIN I, GEDANKEN A. Air stable core-shell multilayer metallic nanoparticles synthesized by RAPET: Fabrication, characterization and suggested applications[J]. J Mater Chem,2012,22(30):15025−15030. doi: 10.1039/c2jm32528d
[17]	孙峰. Rietveld方法精修及定量分析研究[D]. 青岛: 中国海洋大学, 2009. SUN Feng. Research of Rietveld method in refinement of crystal structure and quantitative phase analysis[D]. Qingdao: Ocean University of China, 2009.
[18]	ZHAO S, LIU X, HUO C, LI Y, WANG J, JIAO H. Surface morphology of Hagg iron carbide (χ-Fe₅C₂) from ab initio atomistic thermodynamics[J]. J Catal,2012,294:47−53. doi: 10.1016/j.jcat.2012.07.003
[19]	DE S E, CINQUINI F, BEALE A M, SAFONOVA O V, BEEK W V, SAUTET P, WECKHUYSEN B M. Stability and reactivity of ε-χ-θ iron carbide catalyst phases in Fischer-Tropsch synthesis: controlling μ_c[J]. J Am Chem Soc,2010,132(42):14928−14941. doi: 10.1021/ja105853q
[20]	刘兴武. 铁碳化合物的制备、物相转变以及费托反应性能研究[D]. 北京: 中国科学院大学, 2016. LIU Xing-wu. Preparation, phase transition and properties of iron carbides during Fischer-Tropsch synthesis[D]. Beijing: University of Chinese Academy of Sciences, 2016.
[21]	COHN E M, HPFER L J E. Some thermal reactions of the higher iron carbides[J]. J Chem Phys,1953,21(2):354−359. doi: 10.1063/1.1698884