High-Flux High-Selectivity MFI Molecular Sieve Membranes: Microstructure Control and High-Temperature High-Pressure Use

摘要项目名称：高通量、高选择性MFI分子筛膜：微观结构控制与高温高压应用项目编号：cts -0522518项目负责人：Michael tsapatsis单位：明尼苏达大学本项目的目的是在管状多孔不锈钢支架上合成高取向、微米厚的MFI膜，并在高温膜反应器条件下测试其性能。本文还提出在现有方法的基础上，首次制备了垂直于膜表面的MFI结构的三种主要孔隙取向（直、之、弯）的三种膜，并对其微观结构和分离性能进行了研究。微观结构的控制水平，将被证明将带来实际的沸石多晶薄膜，因为他们可以接近单晶。将对其微观结构进行表征，并测量其分离性能。除了具有实际意义（识别高性能微结构）外，所提出的实验还具有根本意义，因为它们将提供第一组气体和蒸汽通过具有明显不同优先取向的给定结构类型的沸石膜的渗透数据。这样的数据集有望在提供微观结构和膜性能之间的联系以及指导无机膜领域的进一步发展方面具有价值。这项研究将对世界范围内高效分离技术的发展产生更广泛的影响。在商业、高通量、不锈钢支架上生长高质量的膜是扩大规模的必要步骤，并使我们的膜可用于分离和反应工程界。此外，关于无机纳米颗粒在表面的定向组装和模板晶体生长控制的工程问题将被解决，这是功能性纳米结构制造的核心。因此，从传感器到具有可控孔隙度和纳米结构的催化剂等一系列纳米级新技术都可能受到当前研究成果的影响。该研究项目有一个教育组成部分，包括本科生参与研究和明确的推广工作。该项目可能会促进新的分离工艺和催化膜反应器的发展。

AbstractProposal Title: High-flux, High-selectivity MFI Molecular Sieve Membranes: Microstructure Control and High-temperature, High-pressure UseProposal Number: CTS-0522518Principal Investigator: Michael TsapatsisInstitution: University of MinnesotaThe objective of this project is to synthesize highly oriented micrometer-thick MFI films on tubular porous stainless steel supports, and to test their performance under high temperature membrane reactor conditions. It is also proposed to extend the current methodology and prepare for the first time three types of membranes with the three main pore orientations (straight, zig-zag, tortuous) of the MFI structure perpendicular to the film surface and examine their microstructure and separation performance. The level of microstructural control that will be demonstrated will bring practical zeolite polycrystalline thin films as close they can be to single crystals. The microstructure will be characterized and separation performance will be measured. In addition to their practical significance (identifying high performance microstructures), the proposed experiments are of fundamental significance because they will provide the first set of gas and vapor permeation data through zeolite membranes of a given structure type with drastically different preferred orientations. Such a data set is expected to be valuable in providing a connection between microstructure and membrane performance and to guide further developments in the field of inorganic membranes. The proposed research will have broader impacts on the worldwide effort for developing energy efficient separation technologies. High quality film growth on commercial, high-flux, stainless steel supports is a necessary step towards scale up and to make our membranes available to the separations and reaction engineering communities. Moreover, the engineering issues that will be addressed with respect to oriented assembly of inorganic nanoparticles on surfaces and control of templated crystal growth are central for the fabrication of functional nanostructures. Consequently, an entire range of new technologies at the nanoscale, ranging from sensors to catalysts with controlled porosity and nanostructure may be affected by the findings of the current effort. The research program has an educational component including involvement of undergraduate students in the research and a well-defined outreach effort. This project may stimulate the development of new separation processes and catalytic membrane reactors.