Hydrogenolysis of glycerol to 1,3-propanediol over bifunctional catalysts containing Pt and heteropolyacids

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• 作者：Shanhui Zhu ; Yanan Qiu ; Yulei Zhu ; Shunli Hao ; Hongyan Zheng ; Yongwang Li
• 关键词：Glycerol ; Hydrogenolysis ; 1 ; 3-Propanediol ; Heteropolyacids
• 刊名：Catalysis Today
• 出版年：2013
• 出版时间：1 September, 2013
• 年：2013
• 卷：212
• 期：Complete
• 页码：120-126
• 全文大小：578 K

文摘

Hydrogenolysis of glycerol to 1,3-propanediol was conducted over zirconia supported bifunctional catalysts containing Pt and heteropolyacids using H₄SiW₁₂O₄₀ (HSiW), H₃PW₁₂O₄₀ (HPW) and H₃PMo₁₂O₄₀ (HPMo) as active compounds. Pt/ZrO₂ was also examined for comparison. The as-prepared catalysts were characterized by BET, CO chemisorption, XRD, Raman spectra, NH₃-TPD and FTIR of adsorbed pyridine. Compared with Pt/ZrO₂, heteropolyacids modified Pt/ZrO₂ catalysts showed higher acidity and better catalytic performance of glycerol hydrogenolysis to 1,3-propanediol. Among them, Pt-HSiW/ZrO₂ exhibited superior performance due to the high Br?nsted acid sites and good thermal stability. Independent of the heteropolyacid type, the concentration of Br?nsted acid sites appeared as a key to the selective formation of 1,3-propanediol from glycerol hydrogenolysis, whereas the concentration of Lewis acid sites was related to the formation of 1,2-propanediol. We also investigated the reaction network and proposed a possible reaction pathway.