Abstract
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.
Highlights
Ni-Modified Ag/SiO2 Catalysts for Methyl glycolate (MG), containing both hydroxyl and ester groups, is an important fine chemical [1,2,3]
The synthesis of MG by catalytic hydrogenation of dimethyl oxalate (DMO) has been proposed as a more economical and environmentally friendly route compared with other catalytic procedures [2,3,8,9,10]
A calculated amount of Ni(NO3 )2 6H2 O was dissolved in 10 mL deionized water, the Ni(NO3 )2 solution was dropped onto 5 g Ag/SiO2 placed in a 100 mL crucible
Summary
Ni-Modified Ag/SiO2 Catalysts for Methyl glycolate (MG), containing both hydroxyl and ester groups, is an important fine chemical [1,2,3]. Many traditional synthetic technologies, such as the carboxylation of formaldehyde and condensation of methyl formate with formaldehyde [2,6,7], have been applied for the synthesis of MG Disadvantages such as environmental pollution, harsh production process, and low stability of catalyst are obvious [2,6,7]. The catalytic properties and stability of metallic catalysts can be improved by adding a promoter [21,22,23,24]. Several Ag-containing promoted catalysts were applied in the MG synthesis from selective hydrogenation of DMO [5,19,25]. The effects of Ni loadings on the physicochemical properties of AgNi/SiO2 were investigated via comprehensive characterization, and the structure–activity correlation was discussed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
