Transient Studies of Zeolite Membranes

本文主要研究分离过程中沸石膜的输运特性。本研究的具体目的是研究沸石和非沸石孔扩散途径对这些系统中输运行为和化学选择性的相对影响。这是一个重要的问题，因为使用不同的合成方法可以产生各种各样的沸石结构，并且每种情况下，形成具有不同程度的沸石和非沸石孔域的膜结构的可能性。在本研究过程中测量的瞬态渗透数据将对进一步了解沸石和非沸石孔隙扩散途径在这些系统中的相对贡献非常有用。正如提案中所指出的那样，在晶体边界之间形成非沸石途径往往是不可避免的，有必要对这些途径进行表征，并更好地了解它们在分离过程中对膜性能的影响。

This proposal concerns the study of transport properties in zeolite membranes used in separations processes. The particular objective of this study is to investigate the relative influence of both zeolite and non-zeolite pore diffusion pathways on transport behavior and chemical selectivity in these systems. This is a significant issue given the great variety of zeolite structures that can be produced using different synthesis methods, and the likelihood, in each case, of membrane structures being formed with varying degrees of zeolite and non-zeolite pore domains. The transient permeance data to be measured during the course of this research will be extremely useful for furthering our understanding of the relative contributions of zeolite and non-zeolite pore diffusion pathways in these systems. As pointed out in the proposal, the formation of non-zeolite pathways between crystal boundaries is often unavoidable, and there is a need to characterize these pathways and better understand their role in affecting membrane performance in separations processes.