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

该项目关注的是沸石分子扩散研究一揽子建议的物质基础。一方面，该项目具有服务性质，为项目合作伙伴提供高品质、特性良好的沸石材料。另一方面，将探索沸石合成的新途径，以控制和微调晶体性质。在这个项目中生产的沸石样品必须遵守许多要求，这些要求来自于不同实验技术操作的条件。它们涉及晶体尺寸（预计在尽可能大的范围内变化，特别是包括大晶体尺寸），晶体均匀性，在扩散测量的样品制备条件下的晶体耐久性，以及与框架原子有关的晶体组成，交换阳离子和结构缺陷，这可能导致外部和内部传输电阻（障碍）。沸石合成将从国际沸石协会合成委员会推荐的经评估的配方开始。这些配方必须根据项目的目标进一步开发和优化。新的发展包括结晶种子的应用，隔间凝胶制备，共模板概念和微波加热将与温度控制成核生长曲线，通过控制生长条件和不断添加新鲜结晶溶液来调整晶体尺寸和形态以及温度变化等概念一起使用。

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.