环境友好催化剂催化葡萄糖水解的研究

Hydrolysis of glucose over environmentally-benign catalysts

研究了n（SiO2）：n（Al2O3）=20～25的ZRP-5分子筛（催化剂1）、n（SiO2）：n（Al2O3）=30的ZRP-5分子筛（催化剂2）、甲酸、液态水四种催化剂分别催化葡萄糖水解.研究发现,葡萄糖水解机理复杂,产物众多,水解主产物为乙酰丙酸（LA）,同时还有5-羟甲基糠醛（HMF）、果糖、乳酸、甲酸、呋喃甲醛等副产物生成.不同的催化剂对葡萄糖的转化率影响不大,但各个反应产物收率相差很大.HMF的生成比较容易,而LA的生成相对困难.ZRP-5分子筛催化剂对LA具有良好的选择性.

Hydrolysis of glucose in water over four different catalysts was studied, including two ZRP- 5 zeolite catalysts, formic acid and liquid water. It was found that glucose hydrolyzed via complicated mechanism, with levulinic acid （LA） as the main product and variety of by-products such as 5-hydmxymethylfurfural （HMF）, fructose, lactic acid, formic acid and furfural. There was little difference in glucose conversion among different catalysts, but much difference in the yield. Formation of HMF was easier while formation of LA was relatively difficult. The two ZRP-5 zeolite catalysts had better selectivity to LA.