Zhang Chen, Koros William J
School of Chemical & Biomolecular Engineering, Georgia Institute of Technology , 311 Ferst Dr. NW, Atlanta, Georgia 30332-0100, United States.
ACS Appl Mater Interfaces. 2015 Oct 28;7(42):23407-11. doi: 10.1021/acsami.5b07769. Epub 2015 Oct 13.
Understanding how to control transport properties of zeolitic imidazolate frameworks (ZIFs) is critical to extend ZIF-based membranes and adsorbents to a wide spectrum of gas and vapor separations. In this work, we report a facile post-synthetic thermal modification (PSTM) technique to tailor ZIFs' transport properties by balancing diffusivity and diffusion selectivity. With controllable dissociation of framework methyl groups from a precursor ZIF (ZIF-8), we have prepared thermally modified ZIFs showing substantially increased n-butane diffusivity and attractive n/iso-butane diffusion selectivity. Hybrid ZIF/polymer mixed-matrix membranes formed using these thermally modified ZIFs are expected to deliver attractive butane isomer separation performance. Membranes based on such materials can potentially be used to retrofit refinery alkylation units for producing premium gasoline blending stocks.
了解如何控制沸石咪唑酯骨架（ZIFs）的传输特性对于将基于ZIF的膜和吸附剂扩展到广泛的气体和蒸汽分离领域至关重要。在这项工作中，我们报告了一种简便的合成后热改性（PSTM）技术，通过平衡扩散率和扩散选择性来调整ZIFs的传输特性。通过前驱体ZIF（ZIF-8）中骨架甲基的可控解离，我们制备了热改性的ZIFs，其正丁烷扩散率显著提高，且具有吸引人的正/异丁烷扩散选择性。使用这些热改性ZIFs形成的杂化ZIF/聚合物混合基质膜有望实现吸引人的丁烷异构体分离性能。基于此类材料的膜有可能用于改造炼油厂烷基化装置，以生产优质汽油调合组分。
