Synthesis of Zeolite Crystallites for Diffusion Measurement

本项目的工作致力于确定渗透测量（即在固定条件下测量的宏观和介观输运扩散系数）所产生的扩散系数，以便与该联盟中可用的其他技术获得的可比系统的扩散系数进行比较。此外，测量从完全卸载的膜开始渗透实验到渗透突破之间的时间滞后可以在初始瞬态条件下获得等效信息。特别注意研究尽可能多的参数的影响，包括负载、吸附等温线的形状和温度，以及沸石膜的性质（大小、组成）和预处理条件（活化、变质）。因此，本项目的目的是利用金属沸石复合膜作为扩散研究的模型膜。嵌入金属基体中的沸石晶体与该联盟其他成员在平行扩散研究中使用的沸石材料相同。如果项目1中描述的复合沸石膜的制备成功，我们将有独特的可能性：(i)从固定和固定渗透实验中得出扩散系数，（ii）预测任何工业沸石膜的预期渗透率，这很可能是通过在介孔载体上直接结晶薄沸石层来制备的。

The work of this project is devoted to the determination of the diffusivities resulting from permeation measurements (i. e. of macroscopic and mesoscopic transport diffusivities measured under stationary conditions) for comparison with the diffusivities of comparable systems obtained by the other techniques available in the consortium. Moreover, the measurement of the time lag between the start of the permeation experiment with a completely unloaded membrane and the breakthrough of the permeate allows equivalent information under the initial transient conditions. Particular care is given to the investigation of the influence of as many parameters as possible, including loading, shape of the adsorption isotherm and temperature as well as the nature (size, composition) and the pretreatment conditions (activation, deterioration) of the zeolite membrane. It is the aim, therefore, of this project to use the zeolite-in-metal composite membranes as model membranes for diffusion studies. The zeolite crystals embedded into the metal matrix are the identical zeolite materials used in the parallel diffusion studies by the other members of the consortium. Provided that the preparation of the composite zeolite membranes as described in project 1 will be successful, we would have the unique possibility to (i) derive diffusion coefficients from stationary and instationary permeation experiments and to (ii) forecast the expected permeance of any industrial zeolite membrane, which will be most probably prepared by direct crystallization of a thin zeolite layer on a mesoporous support.