Heterogeneous aerobic oxidation reactions are important for synthesizing value- added chemicals from petroleum and biomass-based materials. Recently developed non-PGM metal on N-doped carbon catalysts used in electrochemical oxygen reduction reactions, typically reduce O2 through 4e- pathways with redox potentials that approach the O2/H2O thermodynamic potential. Herein we employed electrocatalysts consist of metal on the N doped carbon (M-N/C), which were found to be active in reducing oxygen in fuel cells for the aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF) in an organic solvent. We found that the Co based catalyst performed the best among the studied metals, whereas polyaniline was the most active nitrogen source. kinetic analysis revealed a first order rate dependence on [HMF], whereas absence of any active metal sources in the filtrate after hot filtration test and 4-step reusability of the catalyst conformed the heterogeneous nature. This study ventures for direct implementation of fuel cell based electrocatalysts for oxidation catalysis in practical organic reaction conditions.

Metal on N-doped carbon electrocatalysts for aerobic oxidation of 5-hydroxymethylfurfural

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