Transient Measurements of Multi-component Permeation in Zeolite Membranes

建议标题：沸石膜多组分渗透的瞬时测量建议编号：CTS-0340563主要研究人员：John Falconer研究所：科罗拉多大学沸石膜可重复制备，对难分离的混合物，如有机异构体，具有高的分离选择性。一种表征分子筛膜孔内气体传输路径的新方法正在发展之中。该方法非破坏性地测量了这些通道的吸附等温线、吸附热、扩散系数和有效厚度。气体混合物将使用带有质谱学检测的瞬时渗透测量。建立了混合气瞬变行为的数学模型，并用来分析混合气的瞬变实验结果。在膜用于分离的条件下，测量混合物的吸附和传输特性对于了解这些新型膜的分离行为至关重要。几种不同孔径和厚度的分子筛膜将被制备成用于这些暂态研究的膜。将对单一气体和混合气体进行瞬变实验。就更广泛的影响而言，瞬时渗透测量有可能显著增加我们对分子筛膜结构和分离性能之间关系的理解。了解吸附和传输特性以及载体的作用将使系统能够针对给定的分离进行设计。这项研究将为研究生分子筛膜的制备和表征奠定基础。本科生也将通过该系关于功能材料的REU现场资助来参与这项研究。

AbstractProposal Title: Transient Measurement of Multi-component Permeation in Zeolite MembranesProposal Number: CTS-0340563Principal Investigator: John FalconerInstitution: University of ColoradoZeolite membranes can be prepared reproducibly with high separation selectivities for difficult-to-separate mixtures such as organic isomers. A new method for characterizing the transport pathways of gases through zeolite membrane pores is being developed. This method measures the adsorption isotherms, heats of adsorption, diffusivities, and effective thickness of these pathways non-destructively. Transient permeation measurements with mass spectrometric detection will be used for gas mixtures. A mathematical model of the mixture transient behavior will be developed and used to analyze transient experimental results for mixtures. Measuring the adsorption and transport properties of mixtures under conditions where the membranes are used for separations is critical for understanding the separation behavior of these novel membranes. Several types of zeolite membranes with a range of pore sizes and thickness will be prepared as membranes for these transient studies. Transient experiments will be carried out for single gases and for mixtures. In terms of the broader impacts, transient permeation measurements have the potential to significantly increase our understanding of the relationship between zeolite membranes structure and separation performance. Understanding the adsorption and transport properties and the role of the support will allow systems to be designed for a given separation. This research will prepare graduate students in preparation and characterization of zeolite membranes. Undergraduates will also be involved in this research through the department's REU site grant on functional materials.