酸化镧铌酸铯催化剂下5-羟甲基糠醛的制备

5-Hydroxymethylfurfural over Acidified Lanthanum Niobate Catalyst Preparation

以镧铌酸铯为前驱体,通过酸化制备固体酸催化剂,采用X射线能谱分析、扫描电镜、X射线衍射对镧铌酸铯和酸化镧铌酸铯进行表征。以二甲基亚砜(DMSO)为溶剂,果糖为反应底物,以酸化镧铌酸为催化剂,催化果糖发生异构化脱水降解生成5-羟甲基糠醛,考察了果糖含量、催化剂种类及用量、反应时间、反应温度以及溶剂浓度对反应的影响。结果表明,以果糖为反应底物制备5-羟甲基糠醛的最佳条件是果糖1 g、二甲基亚砜75 mL、反应温度120℃、时间105 min,此时5-羟甲基糠醛的产率为89.56%。

Using cesium lanthanum niobate as a precursor,a solid acid catalyst was prepared by acidification.X-ray spectroscopy,scanning electron microscopy and X-ray diffraction were used to characterize lanthanum cesium niobate and acidified lanthanum cesium niobate.Dimethyl sulfoxide(DMSO)was used as the solvent,fructose was used as the reaction substrate,and acidified lanthanum cesium niobate was used as the catalyst to catalyze the isomerization and dehydration of fructose to produce 5-hydroxymethylfurfural.The fructose content,catalyst type,and the effects of dosage,reaction time,reaction temperature,and solvent concentration on the reaction showed that the best conditions for preparing 5-hydroxymethylfurfural using fructose as the reaction substrate were 1 g of fructose,75 mL of dimethyl sulfoxide,120℃of reaction temperature,and 105 min of time.The yield of 5-hydroxymethylfurfural was 89.56%.