Research On Catalytic Transformation Of Biomass-Derived Furfural And 5-Hydroxymethylfurfural In Short Chain Alcohols

At present,environmental pollution and energy shortages caused by massive fossil fuel consumption hinder the sustainable development of society.For this reason,it is significative to explore the efficient conversion method of alternative and renewable biomass energy for the chemists.For instance,furfural and 5-hydroxymethyl furfural?5-HMF?are both highly versatile intermediate,which can be transformed into a variety of chemicals or liquid fuels through appropriate chemical processes.Hence,it is applicable to develop catalytic transformation research on furfural and 5-HMF in short chain alcohol.In this artical,our research focuse mainly on the processes of oxidation condensation of furfural with short chain alcohol.At first,we developed the catalytic system of transition metal Cox Oy-N@K-10 and CuO-CeO₂ nanomaterials.In the reaction system of FUR with n-propanol-O₂,we found that a 75.1% conversion of furfural and 92.8% selectivity of desire product 3-?furan-2-yl?-2-methylacrylaldehyde using CoxOy-N@K-10+Cs2CO3 catalytic system at 140oC for 4h under 0.3 MPa of O₂.Next,heterogeneous CuO-CeO₂ catalyst and K2CO3 additive were used to promote the oxidation condensation reaction in FPO system.The conversion of furfural was 85.4% and the selectivity of main product reached 95.3% in the presence of 0.3 MPa O₂ under 140oC for 4h.Meanwhile,additive type,solvent,reaction temperature and time as the factors that influence the condensation reaction were investigated.Moreover,the CoxOy-N@K-10 and CuO-CeO₂ catalyst were detected by the FT-IR?XRD?BET?SEM?TEM?NH3-TPD techniques in order to clarily the relationship between the experimental results and the properties of catalysts.Based on the controlled trial results and reaction phenomenon,the possible reaction mechanism for the cascade oxidative condensation of FUR with n-propanol was proposed.Afterwards,the paper illustrates research on selective oxidation of 5-HMF reaction.A series of heterogenous metal ion doped-MnO₂ catalysts Cu-MnO₂,Cr-MnO₂,V-MnO₂,Mo-MnO₂,Mg-MnO₂,Ca-MnO₂,Al-MnO₂ were developed via liquid precipitation method.Several factors including catalyst type,reaction temperature and time that influence the synthesis of DFF were investigated in short chain alcohol.As a result,when doped the Cu2+into manganese dioxid lattice to form the Cu-MnO₂ catalyst,86.0% conversion of 5-HMF and96.1% selectivity of DFF was obtained in ethanol at 140oC for 5 h under 0.3 MPa of O₂.Furthermore,the conversion of 5-HMF remained above 70% after Cu-MnO₂ catalyst was examined for 5 times,which illustrated that the catalyst has a good stability.Finally,the diferent catalysts were characterized by XRD?BET?SEM and TEM techniques.The test result explain the relation between the physicochemical properties of catalyst and experimental results.