Cheng Shuai, Meng Tao, Mao Dongsen, Guo Xiaoming, Yu Jun, Ma Zhen
School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China.
Nanomaterials (Basel). 2022 Jan 26;12(3):407. doi: 10.3390/nano12030407.
Ni-modified Ag/SiO catalysts containing 0~3 wt.% Ni were obtained by impregnating Ni species onto Ag/SiO 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/SiO 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, N-sorption, XRD, TEM, EDX-mapping, FT-IR, H-TPR, UV-vis, and XPS. The better catalytic activity and stability of Ni-modified Ag/SiO (versus Ag/SiO) 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.
通过将镍物种浸渍到Ag/SiO上，然后进行煅烧和还原，获得了含0~3 wt.%镍的镍改性Ag/SiO催化剂。测试了这些催化剂在草酸二甲酯（DMO）加氢制乙醇酸甲酯（MG）反应中的性能。Ag-0.5%Ni/SiO在这些催化剂中表现出最高的催化活性，并具有优异的催化稳定性。通过XRF、N吸附、XRD、TEM、EDX图谱、FT-IR、H-TPR、UV-vis和XPS研究了镍含量对催化剂结构和表面化学状态的影响。镍改性的Ag/SiO（相对于Ag/SiO）具有更好的催化活性和稳定性，这归因于活性银物种的分散性提高以及由于镍物种的存在而对银颗粒生长具有更高的抗性。
