ZSM-5分子筛膜制备及其表征

发布时间：2018-03-30 12:26

本文选题：MFI型分子筛膜　切入点：原位水热法　出处：《青岛科技大学》2015年硕士论文

【摘要】：ZSM-5分子筛是MF1分子筛的一种,为掺杂A1等杂原子的形态,硅铝比可控,具有亲水憎有机物的特性。其三维孔道结构独特,有效孔径约为0.55 nm,具有良好的热稳定性、耐酸性以及催化性能。近年来ZSM-5分子筛膜在物质分离、催化、膜反应等诸多领域有着广泛的应用。膜技术分离与传统的分离方法相比,可以实现节能、零污染。分子筛膜的制备过程涉及到载体材料、合成液的成分、水热合成条件等,每一步对其合成膜的性能有较大的影响。本论文从载体材料表面改性、合成液成分调节、晶种层的制备等方面进行研究,做出以下工作：(1)采用化学镀的方法对载体表面进行修饰,通过控制化学镀液的成分、化学镀时间,使得在载体表面得到均匀地化学镀层。考查不同化学镀时间对载体表面形貌、化学镀层形貌的影响,并使用单组分气体进行渗透测试。(2)在经过化学镀的载体表面原位生长分子筛膜,考查不同的化学镀层对分子筛膜生长的影响,分析金属元素对分子筛膜生长促进机理,发现镍磷镀层改性的支撑体有利于分子筛膜生长.(3)用原位水热法合成了纳米晶种,考察了合成液中水含量、晶化时间对晶种合成的影响。重点考察不同脱模板剂的方法,催化加氢法能够获得比表面积大、孔道均一的分子筛孔道结构,为以后分子筛膜模板剂的脱除提供参考。(4)采用晶种法制备了分子筛膜,并系统地研究了晶种、晶种层的制备方法及晶化条件等对制备分子筛膜的影响。通过三次生长法制备出完备的分子筛膜,并通过催化加氢裂化法进行模板剂的脱除,用单组份渗透实验进行渗透表征。
[Abstract]:ZSM-5 molecular sieve is a kind of MF1 molecular sieve, which is doped with Al and other heteratomic atoms. The Si-Al ratio is controllable and has hydrophobic organic properties. Its three-dimensional pore structure is unique, its effective pore size is about 0.55 nm, and it has good thermal stability. In recent years, ZSM-5 molecular sieve membranes have been widely used in many fields, such as material separation, catalysis, membrane reaction, etc. Compared with traditional separation methods, membrane separation can achieve energy saving. Zero fouling. The preparation process of molecular sieve membrane involves carrier material, composition of synthetic liquid, hydrothermal synthesis conditions, etc., each step has great influence on the performance of synthetic membrane. The preparation of the seed layer was studied, and the following work was done: 1) the surface of the carrier was modified by electroless plating. By controlling the composition of the electroless plating solution, the electroless plating time, The effect of different electroless plating time on the surface morphology of the carrier and the morphology of the electroless coating was investigated. The effect of different electroless coatings on the growth of molecular sieve membrane was investigated, and the mechanism of metal elements promoting the growth of molecular sieve membrane was analyzed. It was found that the support modified by Ni-P coating was beneficial to the growth of molecular sieve membrane. The nanocrystalline seeds were synthesized by in situ hydrothermal method. The effects of water content and crystallization time on the seed synthesis were investigated. The molecular sieve membrane with large specific surface area and homogeneous pore channel can be obtained by catalytic hydrogenation, which can provide a reference for the later removal of molecular sieve membrane template. The molecular sieve membrane was prepared by crystal seed method, and the crystal seeds were systematically studied. The effect of preparation method and crystallization conditions of seed layer on the preparation of molecular sieve membrane was studied. The complete molecular sieve membrane was prepared by three times growth method, and the template was removed by catalytic hydrocracking method, and the permeation was characterized by single component permeation experiment.
【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.893

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