Ni改性Ag/SiO2催化剂含0~3wt.通过将Ni物质浸渍到Ag/SiO2上,然后煅烧和还原获得%Ni。测试了草酸二甲酯(DMO)氢化为乙醇酸甲酯(MG)的催化剂性能。Ag-0.5%Ni/SiO2在这些催化剂中表现出最高的催化活性,并表现出优异的催化稳定性。通过XRF研究了Ni含量对催化剂结构和表面化学状态的影响。N2吸附,XRD,TEM,EDX映射,FT-IR,H2-TPR,UV-vis,和XPS。Ni改性的Ag/SiO2(相对于Ag/SiO2)的更好的催化活性和稳定性归因于活性Ag物质的改进的分散以及由于Ni物质的存在对Ag颗粒生长的更高的抗性。
Ni-modified Ag/SiO2 catalysts containing 0~3 wt.% Ni were obtained by impregnating Ni species onto Ag/SiO2 followed by calcination and reduction. The catalysts\' performance in the hydrogenation of dimethyl oxalate (DMO) to methyl glycolate (MG) was tested. Ag-0.5%Ni/SiO2 showed the highest catalytic activity among these catalysts and exhibited excellent catalytic stability. The effects of the Ni content on the structure and surface chemical states of catalysts were investigated by XRF, N2-sorption, XRD, TEM, EDX-mapping, FT-IR, H2-TPR, UV-vis, and XPS. The better catalytic activity and stability of Ni-modified Ag/SiO2 (versus Ag/SiO2) are ascribed to the improved dispersion of active Ag species as well as the higher resistance to the growth of Ag particles due to the presence of Ni species.