Study On The Reutilization Hydrogenation Mechanism Of Biomass Derivative Furfural

As of now,Yunnan Province ranks among the world’s top in terms of flower planting area and output growth rate.According to statistical data,approximately100000 tons of flower straw are produced every day in the Dounan Flower Market in Yunnan Province,putting enormous pressure on urban waste treatment.At present,the region mainly uses landfill or composting methods to treat fresh cut flower straw.However,the leachate and biogas generated by landfilling have a certain impact on the environment.At the same time,using it as organic fertilizer is also a low-cost utilization method.Therefore,it is necessary to maximize the utilization of fresh cut flower stem resources.Based on this,this work will explore the hydrogenation utilization of furfural,a derivative of biomass waste flower straw,to synthesize downstream products（such as furfuryl alcohol,acetone,etc.）and achieve high-value utilization.In this study,a unique layered flower-shaped Cu/Mn catalyst with a Cu/Mn molar ratio of 0.8(Cu_0.8Mn₁/BC)was first synthesized and applied in the selective hydrogenation of furfural to produce furfuryl alcohol,achieving 100%furfural conversion and 98.75%furfuryl alcohol selectivity,with excellent cycling stability.Based on the concept of synergistic catalysis of oxygen vacancy defects and transition metal active centers（Cu⁰/Cu⁺）,this study found that Cu and Mn metal sites respectively consumed H₂molecules and C=O groups.Among them,Cu⁰/Cu⁺sites promoted the adsorption and dissociation of H₂and the hydrogenation of reactant species,while Mn sites greatly promoted the adsorption and activation of furfural and reaction intermediates on the surface of oxygen-rich Mn₃O₄due to their strong affinity for oxygen.Moreover,it was found that the Cu⁰/Cu⁺active sites supported by Mn₃O₄can achieve geometric dispersion of the active centers.The Cu⁰sites have a good regulating effect on the desorption of reactants,promoting the rapid desorption of furfuryl alcohol from the surface and achieving high selectivity in hydrogenation reactions.In addition,density functional theory calculations showed that the addition of Mn can adjust the electron density around Cu and shift its d-band center towards the Fermi level,thereby improving the binding ability of Cu with H₂and achieving efficient hydrogenation of furfural.Therefore,the synergistic effect between the Cu⁰/Cu⁺sites and the Mn₃O₄structure containing oxygen vacancies is crucial for the selective hydrogenation of furfural.The surface defect bimetallic engineering method proposed in this study provides a promising guidance for constructing efficient bimetallic catalyst systems.