催化学报 ›› 2026, Vol. 89: 477-490.DOI: 10.1016/S1872-2067(26)65177-7

• 论文 • 上一篇    

隧道限域与淬火锚定协同构筑原子级分散Cu/MnO2催化剂用于高效催化氧化

杨金a, 林家瑾a, 叶常春b, 李逸飞a, 刘淑敏a, 张改革a, 刘圣杰c, 陈光需a,*()   

  1. a华南理工大学环境与能源学院,国家挥发性有机物污染控制工程技术实验室, 广东省大气环境与污染控制重点实验室,广东广州 510006
    b广东工业大学材料与能源学院,广东广州 510006
    c厦门大学化学与化学工程学院,福建厦门 361005
  • 收稿日期:2026-02-27 接受日期:2026-04-28 出版日期:2026-10-18 发布日期:2026-09-01
  • 通讯作者: *电子信箱: cgx08@scut.edu.cn (陈光需).
  • 基金资助:
    中国国家重点研发计划(2024YFC3908700);中国国家重点研发计划(2024YFA1509500);广东省基础与应用基础研究基金(2025A1515010458);广东省创新创业研究团队项目(2019ZT08L075);广东省珠江人才计划(2019QN01L159);国家自然科学基金(22508065)

Tunnel-confined and quenching-anchored atomic Cu in transition metal oxides for efficient catalytic oxidation

Jin Yanga, Jiajin Lina, Changchun Yeb, Yifei Lia, Shumin Liua, Gaige Zhanga, Shengjie Liuc, Guangxu Chena,*()   

  1. aSchool of Environment and Energy,National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou 510006, Guangdong, China
    bSchool of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, Guangdong, China
    cCollege of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
  • Received:2026-02-27 Accepted:2026-04-28 Online:2026-10-18 Published:2026-09-01
  • Contact: *E-mail:cgx08@scut.edu.cn(G. Chen).
  • Supported by:
    National Key Research and Development Program of China(2024YFC3908700);National Key Research and Development Program of China(2024YFA1509500);Guangdong Basic and Applied Basic Research Foundation(2025A1515010458);Guangdong Innovative and Entrepreneurial Research Team Program(2019ZT08L075);Guangdong Pearl River Talent Program(2019QN01L159);National Natural Science Foundation of China(22508065)

摘要:

负载型金属催化剂是多相催化体系中的重要组成部分, 但在保持金属原子高度分散的同时实现高负载量和高可及活性位点密度, 仍是该领域面临的关键挑战. 热冲击/淬火策略可通过快速冷却抑制金属物种迁移与团聚, 为构筑高分散金属催化剂提供了有效途径. 然而, 传统金属氧化物载体多具有紧密堆积或刚性晶格结构, 外源金属物种通常只能锚定于表面或近表面区域, 难以充分利用载体内部晶格空间, 导致金属负载量和有效活性位点数量受限.

针对这一问题, 本文提出一种“淬火快速成核—隧道限域锚定”协同策略, 利用α-MnO2的一维2×2隧道结构为金属原子提供载体内部新增锚定位点, 成功构筑了高密度、抗团聚的原子级分散Cu修饰MnO2催化剂(MnO2-QCu). 该催化剂的Cu负载量达到2.6 wt%, 显著高于传统淬火负载型氧化物催化剂. 结构表征结果表明, 淬火过程不仅促进Cu物种在MnO2表面取代Mn位点, 还进一步激活α-MnO2隧道内部空间, 使孤立Cu物种以Cu-O-Mn配位结构稳定嵌入MnO2框架中. 同时, 快速热收缩诱导的晶格畸变和氧空位形成了丰富的Cu-VO-Mn界面, 调控了局域电子结构, 提高了晶格氧迁移能力和分子氧活化能力. 在CO氧化反应中, MnO2-QCu表现出优异的低温催化活性和湿态稳定性, 在含水条件下连续运行100 h仍保持稳定转化能力. 机理研究表明, α-MnO2隧道可作为亚纳米限域反应空间, 提高CO/O2与活性位点之间的有效相互作用; 同时, Cu-VO-Mn界面能够协同活化分子氧与晶格氧, 使CO氧化在低温下主要通过Eley-Rideal-like路径加速进行, 并由Mars-van Krevelen路径维持晶格氧循环和界面稳定. 与传统浸渍法制备的Cu/MnO2催化剂相比, MnO2-QCu有效避免了稳定碳酸盐物种的积累, 从而降低反应能垒并提升持续催化能力. 此外, 该策略可拓展至Ag, Mg和Ni等多种金属物种的负载, 显示出良好的普适性.

综上, 本研究揭示了隧道结构金属氧化物在激活内部晶格空间、稳定高负载原子级金属物种和构筑高效界面活性位点方面的独特优势, 为高性能负载型金属氧化物催化剂的理性设计提供了新思路. 该类催化剂在汽车尾气净化、挥发性有机物治理及其他低温氧化反应中具有潜在应用价值.

关键词: 原子级分散催化剂, 高负载量, 淬火策略, 隧道结构的二氧化锰, 一氧化碳氧化

Abstract:

Atomic-level dispersed metal catalysts have garnered considerable attention in heterogeneous catalysis due to their ultrahigh atomic efficiency, exceptional catalytic activity, and well-defined active site structures. However, achieving complete atomic-level dispersion of non-precious metals at high mass loadings on metal oxide supports remains a significant challenge. Here, we report the synthesis of a catalyst with highly dispersed 2.6 wt% Cu species on the tunnel-structured α-MnO2 (MnO2-QCu) via a quenching strategy. This approach synergistically leverages the rapid nucleation characteristic of quenching and the confinement effect of the α-MnO2 tunnel structure. Beyond the conventional approach to catalyst loading, the activated tunnel structure of α-MnO2 can provide additional Cu anchoring sites, effectively increasing the number of accessible catalytically active sites. The resulting MnO2-QCu exhibits superior activity in CO oxidation, outperforming most reported Mn-based catalysts, and demonstrates excellent durability over 100 h under humid conditions. Mechanistic studies reveal that MnO2-QCu facilitates the dual activation of lattice and molecular oxygen, while the resulting Cu-VO-Mn interfaces promote charge transfer and enhance O2 adsorption and activation, thereby enabling efficient and stable catalytic oxidation. This work offers a general and feasible route to design high-loading single-atom catalysts on oxide supports for energy and environmental applications.

Key words: Atomic-level dispersed catalysts, High mass loading, Quenching strategy, Tunnel-structured MnO2, CO oxidation