Comparative Study of Different Mesostructured Silica-supported Nano-iron Catalysts for Fischer–Tropsch Synthesis

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2024-06-21 DOI:10.1007/s10562-024-04764-1

Yaqian Liu, Feng Wu, Zhixiong You, Jinjun Li

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Abstract

Fischer-Tropsch synthesis (FTS) converts syngas into multi-carbon products, whose distribution is highly dependent on the catalyst structure. Here, nano-iron catalysts with different silica supports were prepared, and their activities and durability for Fischer-Tropsch to olefins (FTO) process were investigated. Fe/KCC-1 demonstrated the best FTO catalytic selectivity of 25.0% for C_2–4⁼ and an olefin-to-paraffin ratio of 1.68. Its open pore structure allowed primary olefins to escape quickly from the catalyst surface, lowering the probability for secondary reactions. However, its durability was lower than Fe/SBA-15 due to coke formation, pore structure collapse and Fe particle agglomeration. The thermal stability of SBA-15 resulted in its better durability, and the encapsulated Fe particles inside the cylindrical mesopores also allowed better resistance to sintering. However, the less open structure of Fe/SBA-15 led to longer residence time for the primary olefins and increased possibility for secondary reactions, causing undesired chain growth.

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用于费托合成的不同介质结构二氧化硅支撑纳米铁催化剂的比较研究

摘要费托合成（FTS）将合成气转化为多碳产品，其分布与催化剂结构密切相关。本文制备了具有不同二氧化硅载体的纳米铁催化剂，并研究了它们在费托合成烯烃（FTO）过程中的活性和耐久性。Fe/KCC-1 对 C2-4= 的 FTO 催化选择性最好，为 25.0%，烯烃与石蜡的比率为 1.68。其开放式孔隙结构允许初级烯烃迅速从催化剂表面逸出，从而降低了发生二次反应的几率。然而，由于焦炭形成、孔隙结构坍塌和铁颗粒团聚，其耐久性低于 Fe/SBA-15。SBA-15 的热稳定性使其具有更好的耐久性，圆柱形中孔内包裹的铁颗粒也使其具有更好的抗烧结性。然而，Fe/SBA-15 的开放结构较少，导致初级烯烃的停留时间延长，增加了发生二次反应的可能性，从而引起了不希望的链增长。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.