Transient Measurements of Multi-component Permeation in Zeolite Membranes

摘要提案题目：沸石膜中多组分渗透的瞬态测量提案号：cts -0340563首席研究员：John falconer机构：科罗拉多大学沸石膜具有高的分离选择性，可用于难以分离的混合物，如有机异构体。一种表征气体通过沸石膜孔的传输途径的新方法正在被开发。该方法可以非破坏性地测量吸附等温线、吸附热、扩散系数和这些途径的有效厚度。瞬态渗透测量与质谱检测将用于气体混合物。本文将建立一个混合流体瞬态特性的数学模型，并用于分析混合流体的瞬态实验结果。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理解这些新型膜的分离行为至关重要。几种具有不同孔径和厚度的沸石膜将被制备为这些瞬态研究的膜。将对单一气体和混合物进行瞬态实验。就更广泛的影响而言，瞬态渗透测量有可能显著增加我们对沸石膜结构和分离性能之间关系的理解。了解吸附和运输性质以及支撑体的作用将允许系统设计用于给定的分离。本研究将为研究生准备沸石膜的制备和表征。本科生也将通过该部门的REU功能材料现场资助参与这项研究。

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.