Membrane technology with environmentally friendly and cost-efficient features has been well acknowledged as a promising solution for effective CO₂ separation. Metal organic framework (MOF) glasses are one of the most attractive membrane materials currently, because of their easy processability, absence of grain-boundary defects, and permanent porosity. In this study, a mixed linker tetrahedral imidazolate framework-4 (TIF-4) MOF with ultrahigh glass forming ability was selected for fabricating highly CO₂ selective membranes. Through adjusting the molar ratio of the imidazole (Im) and 5-methylbenzimidazolate (5-mbIm) linkers in the TIF-4 framework, the melting temperatures as well as the CO₂ adsorption property could be controlled systematically. After vitrification, TIF-4 glasses (a_gTIF-4) with varying 5-mbIm content were prepared, and all of them exhibit higher isosteric heat of CO₂ adsorption than the corresponding TIF-4 crystals. Both CO₂/CH₄ and CO₂/N₂ uptake ratio (298 K, 1 bar) of a_gTIF-4 samples are more than twice as that of TIF-4 crystals, suggesting the great potential of a_gTIF-4 for CO₂ separation. Further, a_gTIF-4 membranes were successfully prepared by the melt-quenching process from the polycrystalline membranes. a_gTIF-4 membranes are highly CO₂ selective with CO₂/N₂ and CO₂/CH₄ separation factors of 27 and 30. More importantly, a_gTIF-4 membrane displays long-term stability up to 10 months, which is highly conductive to its industrial application for CO₂ separation.

具有环保和成本效益特征的膜技术已被公认为有效的 CO ₂分离解决方案。金属有机框架（MOF）玻璃是目前最具吸引力的膜材料之一，因为它们易于加工、无晶界缺陷和永久性孔隙率。在这项研究中，选择了具有超高玻璃形成能力的混合连接四面体咪唑骨架 4 (TIF-4) MOF 用于制造高 CO ₂选择性膜。通过调整 TIF-4 骨架中咪唑 (Im) 和 5-甲基苯并咪唑 (5-mbIm) 接头的摩尔比、熔解温度以及 CO ₂吸附性能可以系统地控制。玻璃化后，制备了不同5-mbIm含量的TIF-4玻璃（a _g TIF-4），它们都表现出比相应的TIF-4晶体更高的CO _{2吸附等量热。g} TIF-4样品的CO ₂ /CH ₄和CO ₂ /N ₂吸收比（298 K, 1 bar）是TIF-4晶体的两倍以上，表明_g TIF-4的巨大潜力用于 CO ₂分离。此外，通过熔融淬火工艺从多晶膜成功制备了_g TIF-4膜。一_克TIF-4 膜对 CO ₂具有高度选择性，CO ₂ /N ₂和 CO ₂ /CH ₄分离因子分别为 27 和 30。更重要的是，_g TIF-4 膜显示出长达 10 个月的长期稳定性，这是高度有利于其在CO ₂分离方面的工业应用。