Modified CNT-Supported Fe Catalysts for Enhanced CO2 Hydrogenation in Fischer–Tropsch Synthesis

IF 3.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Industrial & Engineering Chemistry Research Pub Date : 2026-10-14 Epub Date: 2026-10-02 DOI:10.1021/acs.iecr.6c02585

Bahman Mohammadkhani, Philip Boahene, Ajay K. Dalai

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引用次数: 0

Abstract

Fischer–Tropsch synthesis (FTS) is a promising route for the sustainable production of synthetic fuels and light olefins from CO₂-derived syngas. Iron-based catalysts are widely studied due to their high CO₂ conversion ability and low cost; however, improving light-olefin selectivity while maintaining high CO₂ conversion remains challenging. In this study, Fe-based catalysts supported on carbon nanotubes (CNTs) were synthesized and optimized using a statistical design of experiments (DOE) approach in Design-Expert software. Catalysts with different Fe/K ratios were evaluated for CO₂ hydrogenation under industrial conditions (280 °C, 2 MPa, H₂/CO₂ = 3, GHSV = 2000 h^–1). The optimum catalyst was further promoted with Cu, Co, and Zn to examine synergistic effects. Characterization by XRD, BET, TGA, ICP, XPS, and FTIR revealed important structure–performance relationships. The addition of 3 wt % Co significantly enhanced catalytic activity and increased light-olefin selectivity to nearly 50 mol % by modifying the active-site structure and electronic environment.

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碳纳米管负载铁催化剂在费托合成中促进CO2加氢

摘要：费托合成法（FTS）是一种很有前途的从co2衍生合成气中可持续生产合成燃料和轻质烯烃的方法。铁基催化剂因其高的CO2转化率和低的成本而受到广泛的研究；然而，在保持高二氧化碳转化率的同时提高轻烯烃选择性仍然具有挑战性。在本研究中，采用design - expert软件中的统计实验设计（DOE）方法合成并优化了碳纳米管（CNTs）负载的铁基催化剂。在工业条件下（280℃，2 MPa, H2/CO2 = 3, GHSV = 2000 h-1），考察了不同Fe/K比催化剂对CO2加氢的影响。进一步用Cu、Co、Zn对最佳催化剂进行促进，考察其协同效应。通过XRD， BET， TGA， ICP， XPS和FTIR表征，揭示了重要的结构性能关系。3 wt %的Co通过改变活性位点结构和电子环境，显著提高了催化活性，并将光烯烃选择性提高到近50 mol %。

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来源期刊

Industrial & Engineering Chemistry Research 工程技术-工程：化工

CiteScore

7.40

自引率

7.10%

发文量

1467

审稿时长

2.8 months

期刊介绍： ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.