磺化水热碳催化乙酰丙酸酯化生成戊酮酸乙酯(英文)  

Esterification of levulinic acid into ethyl levulinate catalysed by sulfonated hydrothermal carbons

作　　者：Filoklis D.Pileidis Maham Tabassum Sam Coutts Maria-Magdalena Ttitirici 

机构地区：[1]Queen Mary University of London, School of Engineering and Materials Science, Mile End Road E1 4NS, London, United Kingdom [2]Queen Mary University of London, School of Engineering and Materials Science,Mile End Road E1 4NS, London, United Kingdom

出　　处：《催化学报》2014年第6期929-936,共8页

摘　　要：The synthesis of carbon-based, heterogeneous sulphonic catalysts for the production of levulinate esters. Hydrothermal treatment at moderated temperatures was employed to generate highly functional carbonaceous materials, referred to as hydrothermal carbons (HTCs), from both glucose, cellulose and rye straw. The products were sulfonated to generate solid acid-catalysts. Characterisation of the as-synthesised materials as well as catalyst activity tests were performed. SEM images indicate the micrometre-sized particles present in both HTCs were largely unaffected by sulfonation, although cellulose-derived HTC displayed signs of inadequate hydrolysis. FT-IR spectroscopy and elemental analysis confirmed successful incorporation of sulphonic groups. 13C solid state NMR, in addition to TGA, elucidated the carbons’ structural composition and supported the common-ly-proposed hydrothermal carbonisation mechanism. Finally, the catalysts were tested via levulinic acid-ethanol esterification and gave high conversion and ester-selectivities (> 90%).The synthesis of carbon-based, heterogeneous sulphonic catalysts for the production of levulinate esters. Hydrothermal treatment at moderated temperatures was employed to generate highly functional carbonaceous materials, referred to as hydrothermal carbons （HTCs）, from both glucose, cellulose and rye straw. The products were sulfonated to generate solid acid-catalysts. Characterisation of the as-synthesised materials as well as catalyst activity tests were performed. SEM images indicate the micrometre-sized particles present in both HTCs were largely unaffected by sulfonation, although cellulose-derived HTC displayed signs of inadequate hydrolysis. FT-IR spectroscopy and elemental analysis confirmed successful incorporation of sulphonic groups. 13C solid state NMR, in addition to TGA, elucidated the carbons’ structural composition and supported the common-ly-proposed hydrothermal carbonisation mechanism. Finally, the catalysts were tested via levulinic acid-ethanol esterification and gave high conversion and ester-selectivities （〉 90%）.

关 键 词：固体酸催化剂 乙酰丙酸 碳材料 酯化 甲酸乙酯 FT-IR光谱 酸水 水热处理 

分 类 号：O621.36[理学—有机化学] O623.624[理学—化学]