Thermodynamically stable synthesis of high entropy alloys and efficiently catalyzed oxidation of 5-hydroxymethylfurfural into 2,5-furandicarboxylic acid under base-free conditions
The high activity and high selectivity in the catalytic oxidation of 5-hydroxymethylfurfural (HMF) into 2,5-furandicarboxylic acid (FDCA) under non-alkaline conditions has always been a significant challenge in the field of biomass utilization. In this work, a thermodynamically stabilized high-entro...
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Veröffentlicht in: | Green chemistry : an international journal and green chemistry resource : GC 2024-11, Vol.26 (22), p.11316-11327 |
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Sprache: | eng |
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Zusammenfassung: | The high activity and high selectivity in the catalytic oxidation of 5-hydroxymethylfurfural (HMF) into 2,5-furandicarboxylic acid (FDCA) under non-alkaline conditions has always been a significant challenge in the field of biomass utilization. In this work, a thermodynamically stabilized high-entropy alloy (HEA) structure with relatively low Pt content was synthesized
via
a simple impregnation-calcination procedure by tuning the mixing enthalpy and the Gibbs free energy of the metal-mixing system. The prepared HEA shows excellent catalytic performance in the aerobic oxidation of HMF into FDCA under base-free conditions. Experiments and DFT calculations revealed that molecular O
2
can be easily activated into highly oxidative hydroxyl radicals (&z.rad;OH) in the presence of water over the HEA surface, and facilitates the oxidation of HMF to FDCA under base-free conditions. This work provides a valuable reference for similar aerobic oxidation processes in which alkaline promoters and noble metal catalysts are needed.
In a completely non-alkaline aqueous system, a high-entropy alloy catalyst composed of FeCoNiCuGaPt activates O
2
and H
2
O molecules to form hydroxyl radicals (&z.rad;OH) and efficiently oxidizes 5-hydroxymethylfurfural into 2,5-furandicarboxylic acid. |
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ISSN: | 1463-9262 1463-9270 |
DOI: | 10.1039/d4gc04186k |