针对生物质催化转化副反应多、产物结构复杂的问题,采用铌酸钾催化剂促进果糖向葡萄糖异构化,抑制因果糖导致的过度副反应,同时起到调控反应路径的作用。系统考察了碱液中反应温度、反应物浓度等对葡萄糖、果糖异构化的影响。结果表明,以果糖为反应物,葡萄糖收率达到68.29%,相应果糖转化率为99.87%;而以葡萄糖为反应物时,果糖收率仅为44.27%。同时对铌酸钾溶液体系中葡萄糖及果糖的异构化进行了动力学分析发现,铌酸钾有效降低了果糖向葡萄糖异构化的活化能。最后对纤维素化学转化的反应机理及产物结构进行了系统分析。

The catalytic conversion of biomass has the drawbacks of vast side reactions and complex product structure.Herein,potassium niobate catalyst is used to promote the isomerization of fructose to glucose,inhibit the excessive side reactions caused by fructose,and regulate the reaction path.The influences of reaction temperature and reactant concentrations on the isomerization of glucose and fructose in alkaline solution are systematically explored.Results show that the yield of glucose reaches 68.29% and the corresponding fructose conversion rate reaches 99.87% when fructose is used as the reactant.The yield of fructose is only 44.27% when glucose is used as the reactant.Meanwhile,the kinetic analysis shows that potassium niobate effectively reduces the activation energy for the isomerization of fructose to glucose.Finally,the reaction mechanism and product structure of cellulose chemical conversion are systematically analyzed.

朱福莉(1997-),女,硕士生,研究方向为催化新材料,zhufuli@ipe.ac.cn;王新承(1988-),男,博士,副教授,研究方向为生物质精细化工,通讯联系人,wangxc@bipt.edu.cn。