Study on performance of Ag-modified layered copper silicate catalyst for hydrogenation of dimethyl oxalate to methyl glycolate

• Published in: Journal of fuel chemistry and technology Vol. 50; no. 8; pp. 1014 - 1022
• Main Authors: XUE, Jing, WU, Meng-meng, SONG, You-wei, ZHAO, Jin-xian, WU, Jian-bin, QUAN, Yan-hong, REN, Jun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2022
• Subjects: hydrogenation of dimethyl oxalate; lamellar copper silicate; methyl glycolate; silver promoter; sol-gel; lamellar copper silicate; methyl glycolate; silver promoter; hydrogenation of dimethyl oxalate; sol-gel
• ISSN: 1872-5813; 1872-5813
• DOI: 10.1016/S1872-5813(21)60011-2

Methyl glycolate (MG) is a high value-added chemical intermediate and widely used in the fields of medicine, chemical industry, fodder and dyes. A series of CuAg/SiO2 catalysts were prepared by sol-gel method for hydrogenation of dimethyl oxalate to MG. The structure of catalysts was characterized by XRD, N2-physical adsorption, FT-IR, TEM, H2-TPR, and XPS, and the influence of Ag loading on catalytic performance was investigated. The 5Ag-Cu/SiO2 catalyst with Ag loading of 5% exhibited the best catalytic performance with DMO conversion of 83.7% and MG selectivity of 72.2%. The characterization results showed that introducing appropriate amount of Ag not only improved the dispersion of copper species, but also increased the content of Cu+, thereby improving the catalytic activity of CuAg/SiO2 catalysts. In addition, the electron transfer between Ag and Cu could effectively stabilize Cu+, and eventually improved the stability of the catalyst.