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首页> 美国卫生研究院文献>Scientific Reports >Post-synthetic Ti Exchanged UiO-66 Metal-Organic Frameworks that Deliver Exceptional Gas Permeability in Mixed Matrix Membranes
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Post-synthetic Ti Exchanged UiO-66 Metal-Organic Frameworks that Deliver Exceptional Gas Permeability in Mixed Matrix Membranes

机译：合成后的Ti交换的UiO-66金属有机框架在混合基质膜中具有出色的透气性

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Gas separation membranes are one of the lowest energy technologies available for the separation of carbon dioxide from flue gas. Key to handling the immense scale of this separation is maximised membrane permeability at sufficient selectivity for CO2 over N2. For the first time it is revealed that metals can be post-synthetically exchanged in MOFs to drastically enhance gas transport performance in membranes. Ti-exchanged UiO-66 MOFs have been found to triple the gas permeability without a loss in selectivity due to several effects that include increased affinity for CO2 and stronger interactions between the polymer matrix and the Ti-MOFs. As a result, it is also shown that MOFs optimized in previous works for batch-wise adsorption applications can be applied to membranes, which have lower demands on material quantities. These membranes exhibit exceptional CO2 permeability enhancement of as much as 153% when compared to the non-exchanged UiO-66 mixed-matrix controls, which places them well above the Robeson upper bound at just a 5 wt.% loading. The fact that maximum permeability enhancement occurs at such low loadings, significantly less than the optimum for other MMMs, is a major advantage in large-scale application due to the more attainable quantities of MOF needed.
机译：气体分离膜是可用于从烟气中分离二氧化碳的最低能耗技术之一。处理这种巨大规模分离的关键是在对N2足够的CO2选择性下最大化膜的渗透性。首次揭示了金属可以在MOF中进行合成后交换，从而大大增强膜中的气体传输性能。已经发现，Ti交换的UiO-66 MOF可使气体渗透率增加三倍，而不会损失选择性，这归因于多种影响，包括对CO2的亲和力增强以及聚合物基体与Ti-MOF之间的相互作用更强。结果，还表明，在先前的工作中针对分批吸附应用优化的MOF可以应用于对物料数量要求较低的膜。与未交换的UiO-66混合基质对照相比，这些膜的CO2渗透性提高了153％，这使它们在负载仅为5 wt％的情况下远远高于Robeson上限。在如此低的负载下会出现最大的渗透率增强这一事实，远低于其他MMM的最优值，这是大规模应用的主要优势，因为它需要更多可达到的MOF量。

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