标题: Length Nano-Fe/SiO2 catalysts prepared by facile colloidal deposition: Enhanced durability in Fischer-Tropsch synthesis

作者: Liu, YQ (Liu, Yaqian); Pan, C (Pan, Cong); Zou, YR (Zou, Yongrong); Wu, F (Wu, Feng); You, ZX (You, Zhixiong); Li, JJ (Li, Jinjun)

来源出版物: FUEL 卷: 333 文献号: 126514 DOI: 10.1016/j.fuel.2022.126514 子辑: 2 出版年: FEB 1 2023

摘要: Nano-iron catalysts exhibit good performances in the Fischer-Tropsch synthesis to lower olefins (FTO), however, there is still a lack of simple methods for their preparation. In this work, we introduced a facile colloidal deposition (CD) method to fabricate silica-supported Fe2O3 nanoparticles using a colloidal solution readily prepared from ferric hydroxide. With increasing the Fe loading from 16.3 % to 31.6 %, the Fe2O3 particle size increased from 1.3 to 6.1 nm. The catalytic performances in FTO were tested at a H2/CO molar ratio of 1. At a Fe loading of 30.4 %, the catalyst having a particle size of 4.7 nm showed the highest lower olefin selectivity and the lowest CO2 selectivity, outperforming analogs prepared by impregnation method. Furthermore, this catalyst showed good stability in a 200-hour durability test, while the impregnated analogue quickly deactivated due to serious coking. Presumably, the effective contact areas between the nanoparticles and the generated carbon sheets are geometrically small, which results in weak van der Waals forces between them, preventing the former from being heavily covered by the latter. Besides, from the point of view of the carbide decomposition mech-anism of coking, due to the relatively low volume to surface area ratios of the intermediate carbide nanoparticles, the surface concentrations of carbon atoms released from them are low, which delays the coke formation. This study may provide a simple method to fabricate supported nano-iron catalysts, and cast some light on under-standing catalyst durability in FTO.

作者关键词: Light olefin; Fischer-Tropsch synthesis; Iron-based catalysts; Colloidal deposition; Coking resistance

地址: [Liu, Yaqian; Pan, Cong; Zou, Yongrong; Wu, Feng; You, Zhixiong; Li, Jinjun] Wuhan Univ, Sch Resource & Environm Sci, Hubei Key Lab Biomass Resource Chem & Environm Bio, Wuhan 430079, Peoples R China.

通讯作者地址: Li, JJ (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Hubei Key Lab Biomass Resource Chem & Environm Bio, Wuhan 430079, Peoples R China.

电子邮件地址: lijinjun@whu.edu.cn

影响因子：8.035