Highly Efficient Separation of C8 Aromatic Isomers by Rationally Designed Nonaromatic Metal-Organic Frameworks
Highly Efficient Separation of C8 Aromatic Isomers by Rationally Designed Nonaromatic Metal-Organic Frameworks
复制标题
合理设计的非芳族金属有机骨架高效分离C8芳族异构体
DOI：
10.1021/jacs.2c10595
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发表时间：
2022-11-10
影响因子：
15
通讯作者：
Yang，Qiwei
中科院分区：
文献类型：
--
作者：
Zhou，Jingyi;Ke，Tian;Yang，Qiwei
C8芳烃（二甲苯和乙苯）的分离由于其相似的结构和性质而仍然是最具挑战性的工业分离之一。迫切需要能够区分异构体之间微小差异的合适吸附剂。在这里，我们展示了一种策略，以实现精确的歧视C8芳烃通过构建一个非芳香族有限的孔隙环境与混合多环烷烃型配体。非芳族低极性孔环境避免了框架和常见苯环之间的强会聚相互作用，同时创造了放大关于异构体的不同甲基（乙基）基团位置的主-客/客-客相互作用之间的差异的可能性。ZUL-C3具有四斜晶系和单斜晶系的金属有机骨架，对C8芳烃具有优异的分离性能，不仅实现了四种异构体的同时分离，而且为OX/PX和OX/MX的动态分离性能奠定了基础。
The separation of C8 aromatics (xylenes and ethylbenzene) remains one of the most challenging industrial separations due to their similar structures and properties. Suitable adsorbents that can distinguish the small differences among isomers are urgently demanded. Herein, we demonstrate a strategy to realize the precise discrimination of C8 aromatics by constructing a nonaromatic confined pore environment with mixed polycycloalkane-type ligands. The nonaromatic low-polar pore environment avoids strong convergent interactions between the framework and the common phenyl rings while creating possibilities to amplify the difference between host–guest/guest–guest interactions regarding the different methyl (ethyl) group positions of isomers. The resultant metal–organic framework, ZUL-C3, with either tetragonal or monoclinic lattice, exhibits outstanding separation performance for C8 aromatics, not only realizing the simultaneous separation of four isomers from each other but also setting a benchmark for the dynamic separation performance of OX/PX and OX/MX.