Catalytic aerobic selective oxidation of 5-HMF to furan-2,5-dicarboxylic acid
Résumé
2,5-Hydroxymethylfurfural (HMF) is an interesting intermediate derived from dehydration of hexoses. 2,5-Furandicarboxylic acid (FDCA) is a useful monomer in the manufacture of polyesters. Catalytic oxidation of HMF to FDCA with air was performed in aqueous weakly basic solutions in the presence of carbon-supported platinum. The performances of the catalyst depend on the method of catalyst preparation and on the base used for neutralization of the acids formed. Further promotion of the catalyst with bismuth yielded a catalytic system with a remarkable activity and selectivity. HMF (0.1M) was completely converted to FDCA within 2.5 h at 100°C under 40 bar air.