Study On Catalytic Hydrogenolysis Of Furfural And 2,5-furandicarboxylic Acid

The preparation of high value-added compounds can be achieved by hydrogenolysis of bio-based furan compounds.This paper focuses on the hydrogenolysis reaction of two typical furan platform molecules,furfural(FFA)and 2,5-furandicarboxylic acid(FDCA),screens suitable catalysts,optimizes reaction conditions,and explores the hydrogenolysis reaction pathway.The main content and results of the paper are as follows:Research on FFA catalytic hydrogenolysis reaction:FFA is one of the most typical furan platform compounds.Studying the hydrogenolysis reaction of FFA has guiding significance for studying the ring-opening of other furan compounds.For the hydrogenolysis reaction of FFA,the catalyst’s active component,support,and Mo/Pd molar ratio were controlled.Reaction temperature,pressure,substrate concentration,and reaction time were optimized.Under the optimal reaction conditions,FFA was catalyzed by Pd-MoO3/TiO2 to achieve a conversion rate of 100%,and the yield of the target product 1,5-pentanediol was 72.5%.The reaction process study proposed the hydrogenolysis reaction pathway of FFA.The extension of the substrate confirmed the universality of Pd-MoO3/TiO2 catalyst for catalyzing hydrogenolysis reaction of furan compounds.BET,XRD,XPS,and other methods were used to characterize the PdMoO3/TiO2 catalyst.It was found that Pd could activate molecular hydrogen in the FFA hydrogenation process,promote the reduction of Mo6+to Mo5+,and provide partial oxygen vacancies,which were conducive to the adsorption of the substrate on the catalyst surface.Research on FDCA catalytic hydrogenolysis reaction:In the hydrogenolysis reaction of FDCA,Pd/C catalyst was selected for saturating C=C bonds,and 20 wt%MoO3/TiO2 catalyst was selected for hydrogenolysis of C-O bonds,and the two were physically mixed for synergistic catalysis.The MoO3/TiO2 catalyst was characterized by BET,SEM,ICP,XPS,XRD,and NH3-TPD.It was found that MoO3 was a dense layered film and TiO2 was a uniformly sized spherical particle,and the two were tightly combined.XPS results showed that Mo element in MoO3/TiO2 catalyst existed in the form of Mo6+,and the valence state did not change after reaction.XRD results showed that the loading amount of MoO3 was just at the singlelayer dispersion threshold when it was 20 wt%.The ratio of catalyst to substrate,reaction temperature,and reaction pressure were optimized.Under the optimal reaction conditions,FDCA achieved a conversion rate of 100%,and the yield of the target product adipic acid was 56%.The cyclic test confirmed the high stability of the catalyst.The reaction process study proposed the hydrogenolysis reaction pathway of FDCA.