EDTA-assisted preparation of highly active catalysts for Fischer-Tropsch synthesis

被引：0

作者：

Zhao X. ^{[1
]}

Chen Z. ^{[1
]}

Tang Z. ^{[1
]}

Shi X. ^{[1
]}

Dai C. ^{[1
]}

Ma X. ^{[1
]}

机构：

[1] School of Chemical Engineering, Northwest University, International Science and Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources, Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technolog

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2022年 / 41卷 / 02期

关键词：

Catalyst; EDTA; Fischer-Tropsch synthesis; Fixed-bed; Hydrocarbons; Syngas;

D O I：

10.16085/j.issn.1000-6613.2021-0522

中图分类号：

学科分类号：

摘要：

Fischer-Tropsch synthesis (FTS) is crucial for the conversion of natural gas, coal and biomass to clean fuels and value-added chemicals. Traditionally, the iron catalysts for FTS are mainly supported on alumina and silica. However, the interaction between metal and support hindered the formation of active phase iron carbide, resulting in low activity of the catalyst. In this study, Fe/Al2O3 catalyst was prepared by EDTA complex impregnation and the dispersion of iron species on alumina support was improved by coulomb interaction between positively charged hydroxyl (OH2+) and [Fe(EDTA)]- complex anion. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), specific surface area (BET), in situ infrared (in-situ IR) and other means were used. The results showed that the addition of EDTA could enhance the sintering resistance of Fe. In the calcining process, EDTA can be decomposed into small organic molecules, which can reduce the iron species in the catalyst to Fe2+ and thus is conducive to the reduction of the catalyst. Besides, more active centers enhanced the CO adsorption capacity of the catalyst. In-situ IR experiments showed that the catalyst prepared with EDTA enriched the active species easier, which improved the conversion of CO. The product distribution in hydrocarbons was improved by adjusting the content of alkali metal sodium in the system. The Fe-Na/Al2O3 catalyst prepared by EDTA complexation showed high CO conversion (88.5%) and high selectivity of C2~C=4 and C5~C11 (total of 71.2%) at a low hydrogen carbon ratio (H2/CO=1/1). © 2022, Chemical Industry Press Co., Ltd. All right reserved.

引用

页码：759 / 769

页数：10

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