Microwave assisted rapid conversion of carbohydrates into 5-hydroxymethylfurfural catalyzed by mesoporous TiO2 nanoparticles
Microwave assisted rapid conversion of carbohydrates into 5-hydroxymethylfurfural catalyzed by mesoporous TiO2 nanoparticles
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DOI：
10.1016/j.apcata.2011.09.037
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发表时间：
2011-12-15
影响因子：
5.5
通讯作者：
Saha, Basudeb
中科院分区：
文献类型：
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作者：
Dutta, Saikat;De, Sudipta;Saha, Basudeb
从碳水化合物生产5-羟甲基糠醛（HMF）的节能和可持续工艺要求很高。在这里，直接转化为HMF的碳水化合物已超过自组装介孔二氧化钛纳米粒子（NPs）催化剂进行了研究。在微波辅助加热条件下，单糖D-果糖和D-葡萄糖、二糖蔗糖、麦芽糖和纤维二糖在水和有机介质中以不同的产率成功地转化为HMF。研究了溶剂极性、微波吸收能力、催化剂用量、反应时间和底物变化对HMF产率的影响。吡啶-IR和NH3-TPD分析证实了刘易斯酸中心的存在，而N-2吸附分析表明，以水杨酸钠为模板合成的自组装介孔TiO 2纳米材料具有较高的BET比表面积。高的表面积，刘易斯酸性和均匀的纳米球状颗粒形态是负责高催化活性的碳水化合物底物的脱水在这种介孔TiO 2纳米材料，而商业上可获得的TiO 2是在类似的条件下，这种脱水反应几乎是无活性的。DMSO和NMP的较高微波能量吸收能力（tan S）导致有机溶剂中的HMF产率高于水。催化剂寿命分析表明，介孔TiO 2纳米颗粒催化剂可以循环使用四个催化循环，而不会明显损失其催化活性。(C)2011 Elsevier B. V.保留所有权利。
Energy efficient and sustainable process for the production of 5-hydroxymethylfurfural (HMF) from carbohydrates is highly demanding. Here, direct conversion of carbohydrates into HMF has been investigated over self-assembled mesoporous TiO2 nanoparticles (NPs) catalyst. Monosachharides D-fructose and D-glucose, disaccharides sucrose, maltose, cellobiose were successfully converted into HMF with variable yields in both aqueous and organic mediums under microwave-assisted heating conditions. The effects of solvent polarity, microwave absorbing ability, catalyst loading, reaction time, and substrate variations on the HMF yields have been studied. Pyridine-IR and NH3-TPD analyses confirmed the presence of Lewis acidic sites, whereas N-2 sorption analysis revealed high BET surface area for the self-assembled mesoporous TiO2 nanomaterials synthesized by using sodium salicylate as template. High surface area, Lewis acidity and uniform nanosphere-like particle morphology are responsible for high catalytic activity in the dehydration of carbohydrate substrates over this mesoporous TiO2 nanomaterial, whereas commercially available TiO2 is almost inactive for this dehydration reaction under similar conditions. The higher microwave energy absorbing ability (tan S) of the DMSO and NMP resulted in higher HMF yield in organic solvents than water. Catalyst life-time analysis suggested that mesoporous TiO2 NPs catalysts can be recycled for four catalytic cycles without appreciable loss of its catalytic activity. (C) 2011 Elsevier B.V. All rights reserved.