焙烧气氛精准调控的Cu/SiO2催化剂用于高效催化丁二酸二甲酯加氢制1,4-丁二醇OA

The catalytic hydrogenation of biomass-derived dimethyl succinate(DMS)to 1,4-butanediol(BDO)represents a pivotal route for producing high-value C4 chemicals in the context of green chemistry.Cu/SiO2 catalysts are known for their high selectivity in hydrogenating ester groups,and their performance is correlated with the microstructure of the copper species.Although calcination is a critical step in defining this active structure,the systematic influence of the calcination atmosphere remains underexplored.In this study,Cu/SiO2 catalysts were prepared via a urea-assisted hydrothermal method and calcined under different atmospheres to elucidate their effects on catalyst physicochemical properties and subsequent hydrogenation performance.A comprehensive characterization suite(N2 physisorption,FT-IR,H2-TPR,XRD,TEM,N2O pulse chemisorption,XPS and NH3-TPD)revealed that the calcination atmosphere profoundly alters the metal-support interaction,thereby regulating the dispersion and chemical state of the loaded copper species.Specifically,calcination in air promoted a stronger metal-support interaction,effectively enhancing the dispersion of copper species and increasing the proportion of key active Cu+species.Consequently,the air-calcined catalyst demonstrated superior performance,achieving 92.37％DMS conversion and 64.15％BDO yield under optimized conditions(210 ℃,5.0 MPa,WHSV of 0.6 h-1,H2/DMS molar ratio of 100).This work underscores calcination atmosphere engineering as a potent strategy for optimizing metal-support interactions in heterogeneous catalysts for efficient hydrogenation processes.