Ni改性Cu/SiO2催化草酸二甲酯加氢制乙醇酸甲酯性能研究OA

The hydrogenation of dimethyl oxalate(DMO)to methyl glycolate(MG)has the advantages of being environmentally friendly and having relatively high MG yield.To optimize the structure and catalytic performances of catalysts for hydrogenation of DMO to MG,a series of Ni-modified Cu/SiO2 with different NiO mass fractions were prepared by synchronous ammonia evaporation method,and the catalysts were characterized by N2 physical adsorption/desorption,XRD and H2-TPR.The catalytic performances of the catalysts were evaluated on a fixed-bed micro-reaction device.The results show that the NiO mass fraction has no significant effect on the texture properties of the catalysts.Under the conditions of reaction temperature of 210℃,pressure of 2 MPa and n(H2)/n(DMO)=100,10Ni-Cu/SiO2 with NiO mass fraction of 10%exhibits good catalytic performance with DMO conversion rate of 98.3%,MG selectivity of 95.4%and MG yield of 93.8%,respectively.In addition,10Ni-Cu/SiO2 has good stability,and its catalytic performance can remain stable within 500 h.