载体形貌对Cu/SiO2催化草酸二甲酯加氢制乙二醇反应稳定性的影响OA

The hydrogenation of dimethyl oxalate(DMO)to produce ethylene glycol(EG)is a green route that combines economic viability with technical feasibility.Nanoparticle-,bulk-and sphere-shaped SiO2 supports were prepared by hydrothermal method for supporting Cu-based catalysts,aiming to investigate the effect of support morphologies on the stability of Cu/SiO2 in DMO hydrogenation.The physicochemical properties of the catalysts were characterized by XRD,SEM,XPS,H2-TPR and so on.The results show that the stability of the Cu/SiO2 catalyst is affected by the morphologies of the SiO2 support.After 70 h of hydrogenation of DMO to EG,the DMO conversion rate and EG selectivity of the Cu/SiO2-N(N represents nanoparticle-shaped)catalyst still reaches 98.4%and 89.5%,respectively,without significant deactivation.Compared with the bulk-and sphere-shaped SiO2-supported catalysts,as well as commercial catalysts,the Cu/SiO2-N catalyst exhibits higher stability.The improvement in stability is mainly due to the higher relative content ratio of Cu+to Cu0 and better anti-carbon deposition performance.