Conversion of biomass to 纬-valerolactone by catalytic transfer hydrogenation of ethyl levulinate over metal hydroxides

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• 作者：Xing Tang ; Huawei Chen ; Lei Hu ; Weiwei Hao ; Yong Sun ; Xianhai Zeng ; Lu Lin ; Shijie Liu
• 关键词：Ethyl levulinate ; 纬-Valerolactone ; Biomass ; Catalytic transfer hydrogenation ; Metal hydroxides
• 刊名：Applied Catalysis B: Environmental
• 出版年：5 April, 2014
• 年：2014
• 卷：147
• 期：Complete
• 页码：827-834
• 全文大小：1721 K

文摘

A series of low-cost readily-assembled eco-friendly metal hydroxides were examined as catalysts in the synthesis of a novel platform molecule, 纬-valerolactone (GVL), from biomass-derived ethyl levulinate (EL) via hydrogen transfer reaction. Among these catalysts, ZrO(OH)₂路xH₂O was found to be most active. EL conversion of 93.6% and GVL selectivity of 94.5% were achieved when 2-propanol was used as a hydrogen donor at 473 K with a reaction time of only 1 h. The complete reaction pathway and the probable main by-products for the conversion of EL to GVL were clearly deduced for the first time. The ZrO(OH)₂路xH₂O catalyst could be reused at least ten times without any significant loss of catalytic activity. Furthermore, characterizations were carried out on the fresh and spent ZrO(OH)₂路xH₂O catalysts with XRD, FT-IR, BET, TGA-DTA. Combined with the results of poisoning experiments, a plausible mechanism for catalytic transfer hydrogenation (CTH) of EL to GVL was proposed to be consisted of a catalytic cycle involving a six member ring transition state.