Separation of xenon/krypton gas mixtures is one of the valuable but challenging processes in the gas industries due to their close molecular size and similar physical properties. Here, we report a novel ultramicroporous hydrogen-bonded organic framework (termed as HOF-40) constructed from a cyano-based organic building unit of 1,2,4,5-tetrakis(4-cyanophenyl)benzene (TCPB), exhibiting superior separation performance for Xe/Kr mixtures, as clearly demonstrated by dynamic breakthrough curves. GCMC simulation results indicate that the pore confinement effect and abundant accessible binding sites play a synergistic role in this challenging gas separation. Furthermore, this cyano-based HOF displays excellent chemical stability from 12 M HCl to 20 M NaOH aqueous solutions.

中文翻译：

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用于高效分离 Xe/Kr 的微孔氢键有机框架

氙/氪气体混合物的分离是天然气工业中有价值但具有挑战性的过程之一，因为它们的分子大小接近且物理性质相似。在这里，我们报告了一种新型超微孔氢键有机骨架（称为HOF-40），由 1,2,4,5-四（4-氰基苯基）苯（TCPB）的氰基有机建筑单元构成，表现出优异的性能。 Xe/Kr 混合物的分离性能，动态穿透曲线清楚地证明了这一点。GCMC 模拟结果表明，孔限制效应和丰富的可接近结合位点在这种具有挑战性的气体分离中发挥协同作用。此外，这种氰基 HOF 在 12 M HCl 到 20 M NaOH 水溶液中表现出优异的化学稳定性。