Catalytic Performance and Texture of TEOS Based Cu/SiO2 Catalysts for Hydrogenation of Dimethyl Oxal

Highly active and selective Cu/SiO2 catalysts for hydrogenation of dimethyl oxalate(DMO) to ethylene glycol(EG) were successfully prepared by means of a convenient one-pot synthetic method with tetraethoxysilane(TEOS) as the source of silica.XRD,H2-TPR,SEM,TEM,XRF and N2 physisorption measurements were performed to characterize the texture and structure of Cu/SiO2 catalysts with different copper loadings.The active components were highly dispersed on SiO2 supports.Furthermore,the coexistence of Cu0 and Cu+ contributed a lot to the excellent performance of Cu-TEOS catalysts.The DMO conversion reached 100％ and the EG selectivity reached 95％ at 498 K and 2 MPa with a high liquid hourly space velocity over the 27-Cu-TEOS catalyst with an actual copper loading of 19.0％(mass fraction).