沸石咪唑盐骨架
膜
渗透
连接器
化学工程
气体分离
咪唑酯
化学
多孔性
材料科学
金属有机骨架
有机化学
吸附
生物化学
操作系统
工程类
计算机科学
作者
Joshua A. Thompson,Justin T. Vaughn,Nicholas A. Brunelli,William J. Koros,Christopher W. Jones,Sankar Nair
标识
DOI:10.1016/j.micromeso.2013.06.036
摘要
Zeolitic imidazolate framework (ZIF) materials are a promising subclass of metal–organic frameworks (MOF) for gas separations. However, due to the deleterious effects of gate-opening phenomena associated with organic linker rotation near the limiting pore apertures of ZIFs, there have been few demonstrations of improved gas separation properties over pure polymer membranes when utilizing ZIF materials in composite membranes for CO2-based gas separations. Here, we report a study of composite ZIF/polymer membranes, containing mixed-linker ZIF materials with ZIF-8 crystal topologies but composed of different organic linker compositions. Characterization of the mixed-linker ZIFs shows that the mixed linker approach offers control over the porosity and pore size distribution of the materials, as determined from nitrogen physisorption and Horváth–Kawazoe analysis. Single gas permeation measurements on mixed-matrix membranes reveal that inclusion of mixed-linker ZIFs yields membranes with better ideal CO2/CH4 selectivity than membranes containing ZIF-8. This improvement is shown to likely occur from enhancement in the diffusion selectivity of the membranes associated with controlling the pore size distribution of the ZIF filler. Mixed-gas permeation experiments show that membranes with mixed-linker ZIFs display an effective plasticization resistance that is not typical of the pure polymeric matrix. Overall, we demonstrate that mixed-linker ZIFs can improve the gas separation properties in composite membranes and may be applicable to aggressive CO2 concentrations in natural gas feeds.
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