重结晶法制备多级孔Sn-Beta分子筛用于催化葡萄糖异构化为果糖

发布时间：2018-05-18 21:33

  本文选题：多级孔Sn-Beta + 葡萄糖异构化　； 参考：《现代食品科技》2017年05期

【摘要】：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。
[Abstract]:Using dealuminated Beta molecular sieve as silicon source, SnCl4 5H_2O as tin source, a multiporous Sn-Beta molecular sieve catalyst with both micropores and mesoporous pores was prepared by two steps hydrothermal recrystallization with the action of mesoporous template cetyltrimethylammonium bromide (CTAB). It was used in the isomerization of glucose. The multiporous Sn-Beta molecular sieves were characterized by FT-IRN XRDX Sn-Beta and N2 adsorption and desorption isotherms. The effects of molar ratio of Si to Sn, reaction temperature, reaction time and amount of catalyst on glucose conversion and fructose yield were investigated. The results show that the molecular sieve has mesoporous structure in addition to the skeleton structure of typical BEA microporous molecular sieve. When the molar ratio of silica to tin is 100, the reaction temperature is 120 鈩，

本文编号：1907294