Co/Mn/N Ternary‐Doped Hollow Mesoporous Carbon Nanospheres Derived From Co, Mn Porphyrin for the Selective Base‐Free Oxidation of 5‐Hydroxymethylfurfural to 2,5‐Furandicarboxylic Acid

ABSTRACT The catalytic conversion of 5‐hydroxymethylfurfural (HMF) to 2,5‐furandicarboxylic acid (FDCA) has attracted significant attention, owing to FDCA acting as a sustainable alternative to petroleum‐derived terephthalic acid. However, the synthesis of the catalyst with high catalytic performance under mild reaction conditions remains a challenge. Herein, we developed a series of Co/Mn/N ternary‐doped hollow mesoporous carbon nanospheres (Co x Mn y @N‐HMCNs) derived from Co, Mn porphyrin as a catalyst for the base‐free oxidation of HMF to FDCA at atmospheric pressure. Remarkably, the optimized catalyst (Co 1.5 Mn 1.5 @N‐HMCNs) exhibited exceptional catalytic performance, with 100% HMF conversion and 90.1% FDCA yield while maintaining robust stability over six consecutive runs. Detailed characterization revealed that Mn doping not only induces a synergistic effect with Co species to enhance the catalytic activity, but also modifies the pyridinic N content. The dual boosts collectively enhance both the catalytic activity and stability of Co 1.5 Mn 1.5 @N‐HMCNs for the base‐free oxidation of HMF to FDCA at atmospheric pressure.