催化学报 ›› 2026, Vol. 85: 371-383.DOI: 10.1016/S1872-2067(26)64961-3

• 论文 • 上一篇    下一篇

Na驱动的Co2C-Co催化剂用于合成气直接制备长链伯醇

李峥a,c,1, 赵子昂a,1, 李怡蕙a, 吕元a, 严丽a, 崔文浩a, 朱顺彬a,c, 孟宇d(), 朱何俊a(), 丁云杰a,b()   

  1. a 中国科学院大连化学物理研究所, 大连洁净能源国家实验室, 辽宁大连 116023
    b 中国科学院大连化学物理研究所, 催化基础国家重点实验室, 辽宁大连 116023
    c 中国科学院大学, 北京 100049
    d 榆林学院化工学院, 陕西省低变质煤洁净利用重点实验室, 陕西榆林 719000
  • 收稿日期:2025-09-18 接受日期:2025-10-22 出版日期:2026-06-18 发布日期:2026-05-18
  • 通讯作者: *电子信箱: zhuhj@dicp.ac.cn (朱何俊),
    mengyu@yulinu.edu.cn (孟宇),
    dyj@dicp.ac.cn (丁云杰).
  • 作者简介:

    1共同第一作者.

  • 基金资助:
    国家重点研发计划(2023YFB4103100);中国科学院前瞻战略科技先导专项(XDA29050300);国家自然科学基金(22002151);国家自然科学基金(22162028);国家自然科学基金(22102147);中国科学技术协会青年人才托举工程(2023QNRC001);能源催化转化全国重点实验室(2024SKL-B-005);辽宁滨海实验室(LBLG-2024-06);辽宁滨海实验室(LBLD-2025-08);陕西省青年科技新星项目(2024ZC-KJXX-088)

Direct synthesis of long-chain primary alcohols from syngas over Na-driven Co2C-Co catalyst

Zheng Lia,c,1, Ziang Zhaoa,1, Yihui Lia, Yuan Lyua, Li Yana, Wenhao Cuia, Shunbin Zhua,c, Yu Mengd(), Hejun Zhua(), Yunjie Dinga,b()   

  1. a Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
    b State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
    c University of Chinese Academy of Sciences, Beijing 100049, China
    d Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization, School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000, Shaanxi, China
  • Received:2025-09-18 Accepted:2025-10-22 Online:2026-06-18 Published:2026-05-18
  • Contact: *E-mail: zhuhj@dicp.ac.cn (H. Zhu),
    mengyu@yulinu.edu.cn (Y. Meng),
    dyj@dicp.ac.cn (Y. Ding).
  • About author:

    1Contributed equally to this work.

  • Supported by:
    National Key Research and Development Program of China(2023YFB4103100);Strategic Priority Research Program of the Chinese Academy of Sciences(XDA29050300);National Natural Science Foundation of China(22002151);National Natural Science Foundation of China(22162028);National Natural Science Foundation of China(22102147);Young Elite Scientists Sponsorship Program by CAST(2023QNRC001);State Key Laboratory of Catalysis(2024SKL-B-005);Liaoning Binhai Laboratory(LBLG-2024-06);Liaoning Binhai Laboratory(LBLD-2025-08);Young Star of Science and Technology in Shaanxi Province(2024ZC-KJXX-088)

摘要:

长链伯醇(C6+OH)作为高附加值化学品, 在增塑剂、表面活性剂、香料等精细化工领域具有广泛应用. 从合成气(CO+H2)出发直接合成长链伯醇是一条具有吸引力的技术路线, 但由于反应过程中CO的解离与非解离吸附并存、碳链增长难以控制, 导致反应网络复杂, 长链伯醇选择性普遍较低. 本文针对上述问题, 通过Na调控Co基催化剂的几何与电子结构, 构建了Na驱动的Co2C-Co双活性中心, 实现了合成气高选择性制备长链伯醇, 为设计高性能合成气制醇类催化剂提供了新思路.

本研究通过在Co基催化剂中引入Na助剂, 构建了具有Na-Co2C-Co结构的双活性中心催化剂. 在220 °C, 5.0 MPa, H2/CO = 2.0和GHSV = 4000 h-1的反应条件下, 总醇选择性为45.9%, 其中长链伯醇占比高达65.4%, 是目前文献报道的最优值. 通过对催化剂的物相结构进行系统分析, 发现Na促进了金属Co向Co2C的原位转化, 形成了稳定的Co2C-Co复合结构. Na的引入显著改变了催化剂的表面电子性质, 诱导产生了富电子的Co2C-Co活性位点. Co2C有利于CO的非解离吸附和插入烷基链, 而金属Co是CO解离吸附和碳链增长的活性位点, Co与Co2C的双位点协同作用是提高长链伯醇选择性的重要原因. 化学吸附实验证实了Na能够增强催化剂的表面碱性, 促进碳链增长, 同时显著抑制了H2的解离与吸附, 形成了“富碳、贫氢”的表面微环境, 从而抑制了烯烃的深度加氢, 降低烷烃的选择性. 密度泛函理论计算从机理层面揭示了Na-Co2C-Co位点的作用机制, Na-Co2C-Co位点显著降低了*CnH2n与*CH2偶联的能垒(从0.74降至0.10 eV), 促进了碳链增长, 同时降低了*CO插入*CnH2n的能垒(从1.93降至1.20 eV), 并提高了烯烃加氢能垒(从0.13升至1.12 eV), 与实验结果一致, 进一步佐证了Na对于构建Co2C-Co活性位点和调节表面反应能垒的双重作用.

综上, 本文通过构建Na驱动的Co2C-Co催化剂, 实现了合成气向长链伯醇的高选择性转化, 揭示了Na在调控活性位点结构与表面反应能垒的关键作用. 该工作为设计高性能Co基催化剂, 推动合成气转化向高值化学品方向发展提供了重要依据.

关键词: 合成气转化, 碱金属, Na驱动的Co2C-Co催化剂, 长链伯醇, 构效关系

Abstract:

The direct synthesis of high-value-added long-chain primary alcohols (LPAs, C6+OH) from syngas (CO + H2) is highly attractive. However, low selectivity of targeted products is generally obtained due to competitive dissociative and non-dissociative CO adsorption, as well as uncontrollable chain growth that causes a complex reaction network. Herein, we report that Na-driven Co2C-Co dual active sites could be engineered by loading the Na promoter onto an activated carbon supported Co-based catalyst, achieving total alcohol selectivity of ca. 46% with a remarkable LPAs fraction higher than 65%, which represents the first report of high LPA selectivity in literature. Comprehensive characterizations and experiments indicated that electron-rich state of Co2C-Co sites was generated through Na promotion, which enhances the surface basicity of the catalyst and favors chain propagation. Moreover, Na promotes the dissociation of CO to form *C species, facilitating the transformation of metallic Co into Co2C and leading to the formation of Na-driven Co2C-Co active sites that are closely associated with CO insertion. Density functional theory calculations show that Na significantly also promotes C-C coupling while inhibiting hydrogenation and promoting CO insertion, which is deemed to be the intrinsic mechanism behind the high LPAs selectivity. This work elucidates a dual role of Na in constructing active sites and modulating surface reaction energetics, providing a design paradigm to break the LPAs selectivity barrier in syngas conversion.

Key words: Syngas conversion, Alkali metal, Na-driven Co2C-Co catalyst, Long-chain primary alcohols, Structure-performance relationship