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Rapid conversion of glucose to 5-hydroxymethylfurfural using a MoCl3 catalyst in an ionic liquid with microwave irradiation
Industrial Crops and Products ( IF 5.9 ) Pub Date : 2020-11-26 , DOI: 10.1016/j.indcrop.2020.113091
Yu Yin , Chunhui Ma , Wei Li , Sha Luo , Yushan Liu , Xueyun Wu , Zhenwei Wu , Shouxin Liu

The efficient conversion of glucose to 5-hydroxymethylfurfural (5-HMF) in ionic liquids with MoCl3 as catalyst under microwave irradiation was demonstrated. Based on 5-HMF yield, the ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) was the best solvent. The results showed that compared to conventional oil-bath heating, microwave irradiation not only reduced the required reaction time from hours to minutes, but also improved the 5-HMF yield. Using 10 mol% of the catalyst, the 5-HMF yield reached 20.61 % at 120 °C after 2.5 h with the oil-bath. However, a 5-HMF yield of 27.66 % could be achieved within 5 min when employing 300 W microwave irradiation. Analyses by nuclear magnetic resonance spectroscopy (NMR) and high-performance liquid chromatography–mass spectrometry (HPLC-MS) demonstrated that the coordinate bond interaction between MoCl3/[BMIM]Cl complex and glucose promoted the isomerism of glucose and the dehydration of fructose. Microwave irradiation was also shown to accelerate the bond breaking processes in the reaction.



中文翻译:

在微波辐射下,在离子液体中使用MoCl 3催化剂将葡萄糖快速转化为5-羟甲基糠醛

使用MoCl 3在离子液体中将葡萄糖有效转化为5-羟甲基糠醛(5-HMF)证明了在微波辐射下作为催化剂。基于5-HMF收率,离子液体1-丁基-3-甲基咪唑鎓氯化物([BMIM] Cl)是最好的溶剂。结果表明,与常规油浴加热相比,微波辐射不仅将所需的反应时间从数小时缩短至数分钟,而且还提高了5-HMF的收率。使用10 mol%的催化剂,在油浴中放置2.5 h后,在120°C下5-HMF的产率达到20.61%。但是,当使用300 W微波辐射时,在5分钟内可以达到27.66%的5-HMF产率。核磁共振波谱(NMR)和高效液相色谱-质谱(HPLC-MS)分析表明,MoCl 3之间的配位键相互作用/ [BMIM] Cl复合物和葡萄糖促进葡萄糖的异构化和果糖的脱水。还显示了微波辐射可加速反应中的键断裂过程。

更新日期:2020-11-27
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