Membrane-based gas separation processes are a technology in continuous evolution. Various types of polymer membranes have been developed, many exhibiting high CO₂ permeability and selective properties over competing gases such as N₂ and CH₄. In order to be competitive, membranes must be less-expensive, more stable, and more efficient, and their production must be scalable. One solution is to develop thin-film composites with mixed-matrix membranes (TFC_MMM) that have the potential to boost productivity while maintaining low costs. In this work, TFC_MMMs containing Matrimid mixed with 12 wt % ZIF-94 were prepared by kiss coating on a porous support. The SEM analysis showed that defect-free membranes with a 3 μm selective layer have been obtained. At 1 bar, the addition of ZIF resulted in improved the separation performance for the CO₂/N₂ pair, with CO₂ permeance of 4 GPU and CO₂/N₂ selectivity of 40, surpassing neat TFC-Matrimid (CO₂ permeance ≈ 3 GPU, CO₂/N₂ selectivity ≈ 29). The use of ZIF-94 also had a stabilizing effect on the membranes against CO₂ plasticization at high pressure.

中文翻译：

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基于马利特酸酯和沸石咪唑酸盐框架的薄膜复合混合基质膜用于 CO2/N2 分离性能


基于膜的气体分离工艺是一项不断发展的技术。已经开发了各种类型的聚合物膜，其中许多膜表现出高 CO₂ 渗透性和优于 N₂ 和 CH₄ 等竞争气体的选择性。为了保持竞争力，膜必须更便宜、更稳定、更高效，并且其生产必须可扩展。一种解决方案是开发带有混合基质膜 （TFC_MMM） 的薄膜复合材料，这种复合材料有可能在保持低成本的同时提高生产力。在本工作中，通过在多孔载体上吻涂制备含有 Matrimid 与 12 wt % ZIF-94 混合物的TFC_MMMs。SEM 分析表明，已经获得了具有 3 μm 选择性层的无缺陷膜。在 1 bar 压力下，添加 ZIF 提高了 CO₂/N₂ 对的分离性能，CO₂ 渗透率为 4 GPU，CO₂/N₂ 选择性为 40，超过了纯 TFC-Matrimid（CO₂ 渗透性≈ 3 GPU，CO₂/N₂ 选择性≈ 29）。ZIF-94 的使用对膜也有稳定作用，防止高压下 CO₂ 塑化。