Synthesis of Zeolite Crystallites and Preparation of Composite Membranes for Diffusion Measurement

该项目关注致力于研究沸石分子扩散的一揽子建议的物质基础。一方面，该项目具有为项目合作伙伴提供高品质、高性能沸石材料的服务性。另一方面，将探索沸石合成的新路线以控制和微调晶体性质。在该项目中生产的沸石样品必须遵守一些要求，这些要求来自不同实验技术操作的条件。它们涉及晶体尺寸（预期其在尽可能大的范围内变化，特别是包括大的晶体尺寸）、晶体均匀性、在用于扩散测量的样品制备条件下的晶体耐久性和相对于骨架原子的晶体组成、可交换阳离子和结构缺陷，其可导致外部和内部传输阻力（屏障）。沸石合成将从国际沸石协会合成委员会推荐的经过评估的配方开始。这些配方必须根据项目的目标进一步开发和优化。新的发展，包括应用晶种，分区凝胶制备，共模板的概念和微波加热将一起使用的概念，作为温度控制的成核生长曲线，定制的晶体尺寸和形态，通过控制生长条件和连续添加新鲜的结晶溶液连同温度变化。

This project cares for the material basis of the package of proposals devoted to the investigation of molecular diffusion in zeolites. On the one hand, this project has a service character to supply the project partners with high-quality and well-characterized zeolite material. On the other hand, novel routes in zeolite synthesis will be explored to control and fine-tune the crystal properties. The zeolite specimens produced within this project have to obey a number of requirements, which result from the conditions under which the different experimental techniques operate. They involve the crystal size, (which is expected to be varied over as large ranges as possible, in particular including large crystal sizes) crystal homogeneity, crystal endurance under the conditions of sample preparation for the diffusion measurements and crystal composition with respect to the framework atoms, the exchangeable cations and structure defects, which can result in external and internal transport resistances (barriers). Zeolite synthesis will start with evaluated recipes as recommended by the Synthesis Commission of the International Zeolite Association. These recipes have to be further developed and optimized according to the aims of the project. Novel developments including the application of crystallization seeds, compartmentalized gel preparation, the co-templating concept and microwave heating will be used together with concepts as temperature controlled nucleation growth profiles, tailoring the crystal size and morphology by controlled growth conditions and continuous addition of fresh crystallization solution together with temperature changes.