Selective Oxidation Of 5-hydroxymethyl Furfural To 2,5-furandicarbaldehyde

Social progress and economic development are inseparable from the use of fossil fuels,but as a non-renewable energy source,the consumption of fossil energy is fast and unrepeatable,We must find a substitute green clean renewable energy source,avoid excessive consumption of non-renewable energy sources,and reduce climate problems such as environmental pollution and greenhouse effect.Biomass resource is a kind of rich green renewable resources.In recent years,more and more research has focused on the conversion of biomass into high-value-added chemicals and biofuels.The rational utilization of biomass energy can bring huge social and economic benefits to people.And it has important strategic significance to environmental protection and energy utilization.2,5-furandicarboxaldehyde(DFF)is one of the downstream products from the selective oxidation of 5-hydroxymethylfurfural(HMF),It is an important organic platform compound and new energy chemical that can synthesize many useful compounds and new polymer materials.The results and progress of the present study confirmed the feasibility of the preparation from HMF to prepare 2,5-dimethyl-furan pathway,However,there are some problems such as low catalyst activity,easy loss of active components and difficulty in separation.The current research focuses mainly on developing new catalyst systems,reducing reaction costs,and improving the recycling efficiency of catalysts,optimizing catalyst synthesis and separation systems.In this thesis,a series of ordered mesoporous carbon materials with different contents were prepared by in-situ doping,In addition,the catalyst was prepared by impregnation method.The catalysts were characterized by XRD,SAXRD,BET,TEM,SEM,XPS,ICP,FT-IR and other chemical analysis methods.It can be concluded that the ordered mesoporous carbon has a higher order degree and a regular structure,heteroatomic nitrogen,phosphorus and boron are also doped with ordered mesoporous carbon,and the active component ruthenium dispersive stability exists on the carrier.It was applied to the preparation of 5-hydroxymethyl selective oxidation of 2,5-dimethyl furan,can show a good catalytic activity.Through the optimization of the catalytic reaction conditions,When reaching 5-hydroxymethyl 2mmol,0.08 g catalyst and 25ml toluene at 110 ? under 2 MPa O2 for 4 h,Ru/OMC-P1:1 catalyst obtained the highest yield of 2,5-dimethyl furan up to 88%.In addition,the 5-hydroxymethyl furfural was completely transformed and catalytic showed the best activity.The cyclic experiments show that the series heteroatom doping ordered mesoporous carbon catalyst has a good circulation performance,Under the same conditions,the conversion rate of HMF and the yield of the product decreased slightly,XRD,SAXRD,TEM,and IR analysis showed that the catalyst's performance was degraded due to the occupation of the catalyst active sites by the byproducts,the degree of destruction of the ordered mesoporous structure during the recycling process,and the combination of a small amount of scandium exposure and agglomeration.