【摘要】 以一次晶化的IM-5分子筛为母体,采用二次水热晶化方法合成了高结晶度的IM-5分子筛。系统考察了无机碱体系和有机碱体系对合成分子筛的结晶度、晶体形貌和孔结构等物性的影响,提出了符合工业化生产的有机碱体系二次晶化合成优化方案。分别采用X射线衍射、扫描电镜、X射线荧光光谱和N₂吸附-脱附等分析表征手段对合成样品进行了物性分析,并对样品的催化性能进行了评价。结果表明:采用二次晶化方法可以有效提高IM-5分子筛的结晶度、比表面积和孔体积等物性,并改善晶体形貌;IM-5分子筛对甲苯与甲醇烷基化反应的催化活性较高。更多还原

【Abstract】 Using IM-5 zeolite by primary crystallization as parent, IM-5 zeolite with high crystallinity was prepared via secondary hydrothermal crystallization. The effects of inorganic base system and organic base system on the crystallinity, crystal morphology and pore structure of the prepared zeolite were investigated systematically, and the optimized scheme of secondary crystallization using organic base system suitable for industrial production was obtained. The physical properties of the prepared samples were analyzed by XRD,SEM,XRF and N₂ adsorption-desorption methods, and the catalytic performance of the samples was evaluated. The results show that the secondary crystallization method can effectively improve the crystallinity, specific surface area, pore volume, and crystal morphology of IM-5 zeolite, which indicates higher catalytic activity in the alkylation reaction of toluene with methanol.更多还原