文献类型：期刊文献

英文题名：Insights into support effects of Ag/SiO2 catalysts for dimethyl glycolate semi-hydrogenation to methyl glycolate

作者：Luo, Zuwei[1];Shen, Yun[1];Fang, Di[1];He, Chuanchao[1];Cao, Yueqiang[1,2];Li, Wei[1];Zhu, Yi -An[1];Zhou, Jinghong[1];Zhou, Xinggui[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Minist Educ, Engn Res Ctr Resource Utilizat Carbon Containing W, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2024

卷号：559

外文期刊名：MOLECULAR CATALYSIS

收录：;EI(收录号：20241515866994);WOS:【SCI-EXPANDED(收录号:WOS:001224587100001)】；

基金：The financial support for this work was provided by the Natural Science Foundation of China (22332003, 22008067, 22178102 and 22073027) , Young Elite Scientists Sponsorship Program by CAST (2023QNRC001) , Shanghai Rising -star Program (23QA1401900) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Ag catalyst; Support effects; DMO semi-hydrogenation; Mesoporous silica; Competitive adsorption

摘要：Support materials play vital roles in heterogenous catalysis via the so-called support effects, and understanding on the support effects is beneficial for the design of high -performance catalysts. Herein, we represent detailed investigations on the support effects of Ag catalysts for dimethyl glycolate (DMO) semi-hydrogenation to methyl glycolate (MG), where G6 silica with amorphous mesopores, SBA-15 with parallel mesopores and silica nanospheres (MSNS) with center -radial ones were employed as the supports. The hydrogenation activity decreases in the order of Ag/MSNS > Ag/SBA-15 > Ag/G6 while the MG selectivity in the order of Ag/G6 > Ag/MSNS > Ag/ SBA-15 at the same reaction conditions, indicating remarkable support effects on both activity and selectivity. Structural characterizations, temperature programmed experiments and in -situ FTIR of DMO adsorption experiments demonstrate that the weak confinement effect of G6 leads to the larger sized Ag nanoparticles and weakened activation of DMO and H (2) , which contributes to low hydrogenation activity. In contrast, the ordered mesoporous SBA-15 and MSNS deliver well confinement effects for Ag nanoparticles and the activation of DMO and H- 2 , but the distinct pore structures result in different activation and diffusion behaviors. Finally, DMO conversion and MG yield are well correlated with the competitive adsorption of H (2) versus DMO on Ag catalysts, indicating such competitivity as a descriptor for DMO semi-hydrogenation over Ag catalysts.