© 2017 by the authors. Licensee MDPI, Basel, Switzerland. Cu/x-SiO2catalysts with 4, 10, and 20 nm silica sols as supports was produced by ammonia evaporation method and characterized. Different nano-sized silica sols as supports significantly affected the structure and catalytic properties of the copper catalysts for ethylene glycol synthesis from dimethyl oxalate. Compared with Cu/20-SiO2and Cu/4-SiO2catalysts, the catalytic performance and stability of Cu/10-SiO2catalyst were greatly enhanced. The Cu/10-SiO2catalyst showed 99.9% conversion with 94% EG selectivity and a lifetime of over 3080 h if it is calculated by industrial weight liquid hourly space velocity (WLHSV) of 0.5 h−1. The Cu/10-SiO2catalyst has one of the longest lifetimes among the catalysts and is a good alternative catalyst for this reaction. Improvement in the catalytic performance and stability of Cu/10-SiO2is attributed to the proper SBET, Dpand larger dispersion of copper. In addition, the supports of Cu/10-SiO2catalyst have smaller particles than that of Cu/20-SiO2; thus, the migration and growth of copper species in catalysts are restrained during the reaction.
Zhang, C., Wang, D., Zhu, M., Yu, F., & Dai, B. (2017). Effect of Different Nano-Sized Silica Sols as Supports on the Structure and Properties of Cu/SiO2 for Hydrogenation of Dimethyl Oxalate. Catalysts, 7(12), 75. https://doi.org/10.3390/catal7030075