水热合成法制备取向ZSM-5分子筛膜的研究

Preparation of oriented ZSM-5 zeolite films on the glasses by hydrothermal synthesis

本文利用硅酸乙酯/甲醇/甲苯混合液体修饰玻璃表面,从而改变其表面性质,再通过水热合成法在修饰过的玻璃表面上制备取向的ZSM-5分子筛膜,借助X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析所得分子筛晶体的取向和形貌,借助衰减全反射红外光谱仪(ATR-FTIR)分析所得ZSM-5分子筛骨架结构。研究结果表明,硅酸乙酯/甲醇/甲苯混合液体修饰过的玻璃表面有利于生长取向的ZSM-5分子筛晶体;水热合成ZSM-5分子筛晶体呈棺材形,晶粒平均尺寸约为1.5μm,随着浸涂次数的增加,分子筛晶体之间的空隙略有缩小,且分子筛晶体多以b取向生长于修饰过的玻璃表面上。

A TEOS/Methanol/Toluene mixture was used to modify the surface of glasses, the surface properties of glasses were consequently changed for making them much compatible for growing oriented zeolite crystallites.Moreover,orientations and morphologies of ZSM-5 zeolite crystallites were characterized by X-ray diffraction（XRD）and scanning electronic micrograph（SEM） respectively.The framework of the crystallites was simultaneously analyzed by attenuated total reflection infrared（ATR-FTIR）.The results show that the surface of glasses modified with the TEOS/Methanol/Toluene mixture is advantageous for growing oriented ZSM-5 zeolite crystallites due to its feasible surface property.The obtained oriented ZSM-5 crystallites are coffin shape,and its crystal diameter is about 1.5 μm.Meanwhile,most of the crystallites are b-oriented ZSM-5 zeolites grown over the modified surface of glasses,and voids between the crystallites decrease with the increasing immersed periods.