膜
丙烷
方解石
连接器
纳米笼
材料科学
化学工程
沸石咪唑盐骨架
选择性
化学
吸附
有机化学
沸石
计算机科学
金属有机骨架
催化作用
工程类
操作系统
生物化学
作者
Zinan Zhang,Han Zhu,Hua Jin,Yi Cao,Wei Fang,Zhenxin Zhang,Qiang Ma,Jungkyu Choi,Yanshuo Li
出处
期刊:Angewandte Chemie
[Wiley]
日期:2024-09-26
卷期号:64 (3): e202415023-e202415023
被引量:19
标识
DOI:10.1002/anie.202415023
摘要
ZIF-8 membranes have long been prized for their exceptional C3H6/C3H8 separation performance. On the other hand, ZIF-8 has structural flexibility, where the external pressure triggers channel expansion, potentially deteriorating the molecular sieving ability. Here, we demonstrate a reliable strategy to fine-tune the flexible pore structure of ZIF-8 by embedding crown ether within a ZIF-8 membrane. Benzo-15-crown-5 (15C5) was selected as the cavity occupant and perfectly confined in the sodalite (SOD) cage of ZIF-8. The 15C5 molecules, which have a size comparable to the nanocage, impose a spatial constraint on linker rotation, enabling the phase transition to a rigid structure in the flexible ZIF-8. The corresponding 15C5@ZIF-8 membranes achieve an ultrahigh C3H6/C3H8 selectivity of 220, outperforming that of most membranes. Unlike their flexible counterparts, the resulting membranes manifest a positive increase in the C3H6/C3H8 separation factor with elevated pressure, securing a record-high C3H6/C3H8 separation factor of 331 under 7 bar. More importantly, extraordinary separation stability was demonstrated with continuous measurement, which is highly desirable for practical applications.
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