Aqueous phase hydrogenolysis of glycerol to bio-propylene glycol over Pt-Sn catalysts

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• 作者：Maria L. Barbelli ; Gerardo F. Santori ; Nora N. Nichio ; ^{nnichio@quimica.unlp.edu.ar}
• 关键词：Hydrogenolysis ; Glycerol ; Propylene glycol
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：May, 2012
• 卷：111
• 期：Complete
• 页码：500-503
• 文件大小：244 K

摘要

PtSn supported on SiO₂ obtained via surface organometallic chemistry techniques catalyzes hydrogenolysis of glycerol to obtain bio-propylene glycol (PG). Bimetallic catalysts with Sn contents between 0.1%and 1%wt were carefully prepared by selective hydrogenolysis of Sn(n-C₄H₉)₄ on Pt. TEM, TPR, H₂ and CO chemisorptions, and XPS studies have shown that tin selective deposition on the metallic phase is obtained. At 200 掳C under N₂ or H₂ pressure, the presence of tin increases drastically: both the selectivity and the activity of the glycerol conversion into PG. During 2 h batch runs; it could be observed that PtSn catalysts with Sn/Pt ratio = 0.2 showed the best performance (PG selectivity = 59%and 83%under N₂ and H₂ pressure respectively). The increase in activity and selectivity could be explained by the presence of Sn⁺ⁿ species 鈥渁cid Lewis sites鈥?which would facilitate the C-OH adsorption and its subsequent C-O cleavage favoring the propylene glycol production.