5-Hydroxymethyl-2-furancarboxylic acid (HMFCA) is an important feedstock in chemical and pharmaceutical industries . Its production through aerobic conversion of 5-hydroxymethylfurfural (5-HMF) has promising prospects but is challenged by the over-oxidation. In this work, we develop a refined Pt-Ag co-catalytic strategy to tailor the selectivity of 5-HMF’s aerobic oxidation. By simple in situ addition of AgNO 3 to the thermal catalytic system of Pt nanoparticles , the main products of 5-HMF oxidation could be shifted from 2,5-furandicarboxylic acid (FDCA) to HMFCA with an ultrahigh selectivity of over 99 %. Density functional theory calculations demonstrate that such strategy could alter the HMFCA adsorption sites from Pt to Ag sites and prevent the oxidation of hydroxymethyl group . In addition, this strategy can be extended to other Ag species, such as AgCl, Ag 2 O and AgO. This work provides insights into the Pt-Ag synergistic catalysis and opens up a simple avenue to control the product selectivity for biomass refinement.
Metal-free graphitic carbon nitride (g-C 3 N 4 ) catalyst was synthesized by a simple calcination of melamine. The characterization results indicate that the water treatment during preparation process is in favor of the formation of pore structure, enhancing light-harvest ability and suppressing the recombination of the photoexcited electron-hole pair. The as-prepared g-C 3 N 4 catalyst was applied in the photocatalytic selective oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF). The effects of incident wavelength, solvent, reaction time and scavenger on the photocatalytic performance were investigated. The results indicate that O 2 − plays a key role as dominant active species in photocatalytic oxidation of 5-HMF. Compared with visible light, the UV light illumination is easier to cause the overoxidation of target product and thus leads to a lower DFF selectivity. Under the irradiation of light with wavelength >400 nm, the highest DFF selectivity of 85.6% can be achieved with HMF conversion of 31.2% in the presence of O 2 .
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