【摘要】 在HMBr₂-Na₂O-Al₂O₃-SiO₂-H₂O体系中,以丝光沸石（MOR）分子筛溶胶次级结构单元为前驱体,通过纳米组装法合成了具有包埋结构的MOR/EU-1复合分子筛,并通过X射线粉末衍射（XRD）、扫描电镜（SEM）和N₂物理吸附-脱附分析（BET）等手段对复合分子筛的物理化学性质进行表征。结果表明:该MOR/EU-1复合分子筛主要是微孔结构的复合材料,形貌为MOR分子筛外表面大部分被不规则状EU-1分子筛均匀覆盖,沿着MOR分子筛呈层状形式生长;EU-1分子筛形貌由椭圆状形貌转变为不规则六方状,包埋在纳米线条MOR分子筛外侧。晶体的晶化成核表观活化能E_n为83.51 kJ/mol,其表观生长活化能E_g为40.11 kJ/mol。MOR/EU-1复合分子筛用于甲醇芳构化反应,对二甲苯的选择性较高。更多还原

【Abstract】 In HMBr₂-Na₂O-Al₂O₃-SiO₂-H₂O system, using MOR molecular sieve secondary structural units as precursor, MOR/EU-1 composite molecular sieve with embedded structure was synthesized through the nano-assembly method. The physical and chemical properties of composite zeolites were characterized by meaning of X-ray powder diffraction（XRD）, scanning electron microscopy（SEM） and physical adsorption and desorption analysis of N₂（BET）. Results show that the composite molecular sieve is mainly composed of microporous material, with the morphology of MOR molecular sieve embedded by irregular hexagonal EU-1. The crystallization nucleation activation energy E_n is 83.51 kJ/mol and the apparent growth activation energy E_g is 40.11 kJ/mol. In methanol aromatization reaction, the selectivity of p-xylene product is much higher.更多还原