Cu/ZnO催化剂的金属载体相互作用及其对糠醛加氢制糠醇反应性能的影响OA北大核心CSTPCD

A series of Cu/ZnO catalysts were prepared by the coprecipitation method and the effect of Cu/Zn ratio on the strong metal support interaction(SMSI)as well as its relation to the catalytic performance of Cu/ZnO in the gaseous hydrogenation of furfural to furfuryl alcohol was investigated.The H2-TPR,XRD,SEM,TEM and XPS characterization results reveal that there exists the SMSI effect in the Cu/ZnO catalyst that influences the catalyst microstructure.ZnO support,acting as a geometric modifier on the active metal Cu particles,has a significant influence on the electronic state of the surface Cu species.The strength of SMSI is related to the Cu/Zn ratio and the SMSI strength of various Cu/ZnO catalysts follows the order of 20Cu/ZnO>40Cu/ZnO>60Cu/ZnO>80Cu/ZnO.Under the same reaction conditions,the lifetime of the 20Cu/ZnO catalyst with a furfural conversion of above 80%is only 5 h,in comparison with the lifetime of 28 h for the 60Cu/ZnO catalyst.That is,appropriate SMSI can enhance the stability of the Cu/ZnO catalyst in the hydrogenation of furfural to furfuryl alcohol,whereas excessive SMSI is detrimental to the catalyst activity.