Effect of Different Nano-Sized Silica Sols as Supports on the Structure and Properties of Cu-SiO2 for Hydrogenation of Dimethyl OxalateReportar como inadecuado


Effect of Different Nano-Sized Silica Sols as Supports on the Structure and Properties of Cu-SiO2 for Hydrogenation of Dimethyl Oxalate


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1

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

2

School of Chemistry and Chemical Engineering of Shihezi University, Shihezi 832000, China





*

Author to whom correspondence should be addressed.



Academic Editors: Adam F. Lee, Jean-Philippe Dacquin and Karen Wilson

Abstract Cu-x-SiO2 catalysts 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-SiO2 and Cu-4-SiO2 catalysts, the catalytic performance and stability of Cu-10-SiO2 catalyst were greatly enhanced. The Cu-10-SiO2 catalyst 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-SiO2 catalyst 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-SiO2 is attributed to the proper SBET, Dp and larger dispersion of copper. In addition, the supports of Cu-10-SiO2 catalyst have smaller particles than that of Cu-20-SiO2; thus, the migration and growth of copper species in catalysts are restrained during the reaction. View Full-Text

Keywords: silica sol; ethylene glycol; hydrogenation; stability; lifetime silica sol; ethylene glycol; hydrogenation; stability; lifetime





Autor: Chuancai Zhang 1, Denghao Wang 2, Mingyuan Zhu 2, Feng Yu 2 and Bin Dai 2,*

Fuente: http://mdpi.com/



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