Na promoter synergistic tuning Co-Fe alloy-carbide dual sites: Directing syngas conversion to C2+ alcohols

Q3 Energy

燃料化学学报 Pub Date : 2026-07-01 Epub Date: 2026-07-24 DOI:10.1016/S1872-5813(26)60670-6

Hengxuan ZHANG, Yan SUN, Qiwen SUN, Jianmin WU

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Abstract

Designing highly efficient catalysts for the direct conversion of syngas to C₂₊ alcohols is crucial for the effective utilization of coal-based resources and the enhancement of national energy security. In this study, a series of Na-modified CoFe/Al₂O₃ catalysts were synthesized via the impregnation method, and their catalytic performance in syngas-to-alcohol reactions was systematically evaluated. Multiple characterization techniques, including XRD, N₂ adsorption-desorption, H₂-TPR, XPS, DRIFTS, in situ Raman and Mössbauer spectroscopy, were employed to elucidate the synergistic effects of Na and Fe promoters on the catalyst structure and catalytic behavior. The results demonstrate that Na facilitates the formation of Co-Fe alloy sites during the reaction. Simultaneously, Fe modifies the electronic state of Co species and promotes the transformation of lattice oxygen into adsorbed oxygen, thereby increasing the concentration of surface oxygen vacancies. The synergistic interaction between the alloy and carbide sites enhances the CO insertion capability of olefin intermediates, leading to a significantly improved selectivity towards C₂₊ alcohols. Under the conditions of 260 °C and 2 MPa, the Co1Fe1Na1 catalyst exhibited optimal performance, achieving a total alcohol selectivity of 45%, with C₂₊ alcohols accounting for 94.1%. This study provides novel insights into the rational design of Co-based catalysts for the efficient conversion of syngas to C₂₊ alcohols.

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Na促进剂协同调节Co-Fe合金-碳化物双位点：引导合成气转化为C2+醇

设计高效的合成气直接转化为C2+醇催化剂，对煤基资源的有效利用和提高国家能源安全具有重要意义。本研究采用浸渍法制备了一系列na修饰的CoFe/Al2O3催化剂，并对其在合成气制醇反应中的催化性能进行了系统评价。采用XRD、N2吸附-解吸、H2-TPR、XPS、DRIFTS、原位拉曼和Mössbauer光谱等多种表征技术，研究了Na和Fe促进剂对催化剂结构和催化行为的协同作用。结果表明，在反应过程中，Na有利于Co-Fe合金位的形成。同时，Fe修饰Co的电子态，促进晶格氧向吸附氧的转变，从而增加表面氧空位的浓度。合金和碳化物位点之间的协同作用增强了烯烃中间体的CO插入能力，从而显著提高了对C2+醇的选择性。在260℃和2 MPa的条件下，Co1Fe1Na1催化剂表现出最佳的性能，总醇选择性为45%，其中C2+醇的选择性为94.1%。该研究为co基催化剂的合理设计提供了新的见解，从而有效地将合成气转化为C2+醇。下载：下载高分辨率图片（156KB）下载：下载全尺寸图片

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.