Research On The Preparation Of Its Derivatives Based On The Catalytic Oxidation Of 5-hydroxymethyl Furfural

The rapid development of human society has led to a reduction in fossil fuel reserves and an increasing environmental pollution.Developing and utilizing renewable resources to prepare chemical products is an important way to address current resource and energy crises.Biomass resources are energy sources with a wide range of sources,green pollution-free,and renewable.5-hydroxymethylfurfural(HMF)is considered to be an important bio-based chemical,which can be obta:ined from common carbohydrates dehydration in nature.5-HMF can be converted into a variety of high value-added compound intermediates such as 2,5-furandicarboxylic acid(FDCA),5-carbonyl-2-furancarboxylic acid(FFCA)and 5-hydroxymethyl-2-Furancarboxylic acid(HMFCA).A series of nanoscale metal oxides were synthesized incdued CuO,Co3O4,MnO2,Fe3O4 and Fe2O3.The prepared metal oxides were characterizated by FT-IR?XRD and TEM.Using the above metal oxides as catalysts and using sodium hypochlorite aqueous solution as oxidant to investigate the catalytic oxidation of 5-HMF,it was found that CuO and Co3O4 have high catalytic activity in the reaction system.Under the optimal conditions,using CuO as a catalyst,the conversion of 5-HMF is as high as 100%,and the yield of FDCA is as high as 99.21%.Using Co3O4 as a catalyst,the conversion of 5-HMF was as high as 100%,and the yield of FDCA was as high as 98.99%.Among them,CuO has better cycle stability and Co3O4 has poor cycle stability.Among them,the cycle stability of CuO is better and that of Co3O4 is worse.Secondly,the supported catalysts Au@SiO2,Au@ZnO and Au@GO were successfully prepared.The oxides were characterized by EDX and TEM,and applied to the catalytic oxidation of 5-HMF.Using hydrogen peroxide as the oxidant,the best reaction conditions were obtained.Under the reaction conditions,the conversion of 5-HMF was 100%,and the yield of HMFCA was 98.92%.In this paper,the reaction mechanism was studied.The active material hydroxyl radical(·OH)was successfully captured by EPR technology.It was found that the hydroxyl radical generated in the copper oxide-sodium hypochlorite system can directly and efficiently oxidize 5-HMF into FDCA.The hydroxyl radical generated in the Au@SiO2-H2O2 reaction system can efficiently oxidize 5-HMF into HMFCA.