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以脱铝Beta分子筛作为硅源,SnCl_4·5H_2O为锡源,在介孔模板剂十六烷基三甲基溴化铵(CTAB)的作用下经过两步水热重结晶法制备了同时具有微孔和介孔的多级孔Sn-Beta分子筛催化剂,并将其用于葡萄糖异构化反应。采用FT-IR、XRD、SEM、TEM、ICP和N2吸附脱附等温线等对多级孔Sn-Beta分子筛进行了表征。考察了分子筛中硅锡摩尔比、反应温度、反应时间和催化剂用量对葡萄糖转化率和果糖得率的影响,并对其重复使用性和再生利用进行了研究。结果表明:该分子筛除了具有典型的BEA微孔分子筛的骨架结构外还具有介孔的结构。在催化葡萄糖异构反应中,当分子筛硅锡摩尔比为100,反应温度120℃,反应时间2 h,40 mL质量分数为10%的葡萄糖,催化剂用量为4 g时,果糖的得率高达47.20%,且具有较好的可再生和多次重复使用性。
With the dealuminated zeolite Beta as the silicon source and SnCl_4 · 5H_2O as the tin source, the mesoporous template Cetyltrimethylammonium bromide (CTAB) Pore and mesoporous Sn-Beta molecular sieve catalyst, and its use for glucose isomerization. Multi-staged Sn-Beta zeolites were characterized by FT-IR, XRD, SEM, TEM, ICP and N2 adsorption-desorption isotherms. The effects of molar ratio of silica to tin, reaction temperature, reaction time and amount of catalyst on the conversion of glucose and the yield of fructose were investigated. The reusability and regeneration were investigated. The results show that the zeolite has a mesoporous structure in addition to the framework structure of a typical BEA microporous molecular sieve. In the catalytic glucose isomerization reaction, the yield of fructose was as high as 47.20 when the molar ratio of silica to tin was 100, the reaction temperature was 120 ℃, the reaction time was 2 h, 40 mL of 10% glucose and 4 g of catalyst were used. %, And has good reproducibility and reusability.