Investigate On The Performance Of M-TiO₂ Catalyst And Its Application In The Oxidation Of 5-hydroxymethylfurfural

5-Hydroxymethylfurfural(HMF)is a multifunctional platform molecule extracted from biomass.The use of chemical catalysis to convert it into PEF monomer with high added value is currently a hot spot in the chemical industry.In this process,the development of more efficient,more economical and greener chemical catalysts is of far-reaching significance to academic research and industrial applications.This work designed a strategy to reduce the loading of Au on TiO2 and improve the catalytic efficiency by modifying with transition metal oxides(FeOx,CoOx,NiOx),which is used to convert 5-hydroxymethylfurfural(HMF)to 2,5-furandicarboxylic acid(FDCA).Auε’-Ov-Ti3+catalytic interface is formed in the catalyst,which makes HMF and FDCA reach 100%conversion and 90.2%yield,respectively.Design experiments proved that the difference in FDCA yield is mainly due to the difference in the ability of the catalyst to adsorb reactants and activate oxygen.The research on the rate-determining step ruled out the influence of alkali,and further proved through selective poisoning experiment that superoxide radical(·O2-)is the key factor of HMF oxidation.Based on the above results,an alkali-free reaction was tried and 71.2%FDCA yield was achieved.This work has promoted the understanding of the aerobic oxidation reaction mechanism and provided a theoretical basis for the development of heterogeneous catalysts involving multiple metals.