Optimizing Propylene/Propane Sieving Separation through Gate-Pressure Control within a Flexible Organic Framework

文献类型： 外文期刊

第一作者： Li, Lu

作者： Li, Lu;Xiang, Fahui;Li, Yunbin;Yang, Yisi;Yuan, Zhen;Chen, Yanting;Yuan, Furong;He, Lei;Xiang, Shengchang;Chen, Banglin;Zhang, Zhangjing;Xiang, Fahui

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关键词： C3H6/C3H8 Sieving Separation; Gate pressure control; Hydrogen-Bonded Organic Framework; Temperature Dependent

期刊名称：ANGEWANDTE CHEMIE-INTERNATIONAL EDITION （ 影响因子：16.9； 五年影响因子：16.4 ）

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年卷期： 2025 年 64 卷 7 期

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收录情况： SCI

摘要： The separation of propylene (C3H6) and propane (C3H8) is of great significance in the chemical industry, which poses a challenge due to their almost identical kinetic diameters and similar physical properties. In this work, we synthesized an ultramicroporous flexible hydrogen-bonded organic framework (named HOF-FJU-106) by using molecule 2,3,6,7-tetra (4-cyanophenyl) tetrathiafulvalene (TTF-4CN). The formation of the dimer causes the TTF-4CN molecular to bend and weaken pi-stacked interactions, coupled with the flexibility of C equivalent to N & ctdot;H-C hydrogen bonds, which leads to reversible conversion between open and closed frameworks through the mutual slip of adjacent layers/columns under activation and stimulation of gas molecules. Through gas adsorption isotherms and adsorption enthalpy, HOF-FJU-106a exhibited adaptive adsorption and stronger binding affinity for C3H6, and presented a recorded gas uptake ratio of C3H6/C3H8 (23.77) among presentative HOF materials at room temperature to date. Importantly, the flexible HOF-FJU-106a shows an interesting phenomenon about the reversible gate pressure control under variable temperature, which realized the gas adsorption and separation performance enhancement for the binary C3H6/C3H8 mixtures. This strategy through designing HOFs with thermoregulatory gating effect is a powerful way to maximize the performance of materials.

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