Research Progress of CNT‐based Catalysts in Low‐Temperature Catalytic Oxidation of CO

Abstract Carbon monoxide (CO) in cigarette smoke poses significant human health risks, and merely reducing tar content cannot achieve tobacco harm reduction. Developing innovative filter materials that effectively convert CO at 60–70°C (cigarette combustion temperature) is crucial. Carbon nanotubes (CNTs) are promising carriers for low‐temperature CO catalytic oxidation due to their high conductivity, large specific surface area, excellent thermal stabilit, and spatial confinement effect. This paper systematically reviews research progress on CNT‐based metal catalysts for this purpose. It describes synthesis methods of supported catalysts (active components dispersed on CNT outer surfaces) and confined catalysts (active components encapsulated in CNT hollow interiors). Compared with graphene oxide‐based and activated carbon‐based catalysts, CNT‐based ones exhibit superior low‐temperature catalytic activity. Key factors regulating performance (active component particle size, oxidation state, CNT surface functional groups, interfacial electronic interactions, hydrophilicity/hydrophobicity) and reaction mechanisms (L‐H, M‐K, E‐R) are elucidated, providing theoretical and technical support for tobacco harm reduction and industrial application of low‐temperature CO catalysis.