北京理工学院冯霄团队报道了1-丁烯同分异构体潮湿的条件下通过一个健壮有机框架的分子排斥分离。相关研究成果发表在2023年5月31日出版的国际学术期刊《德国应用化学》。

吸附分离正丁烯和异丁烯是一种节能的替代方案，但设计能够区分异构体之间细微差异的多孔吸附剂极具挑战性。目前，能够筛选1-丁烯异构体并且足够稳定以承受潮湿气体混合物的吸附剂，在很大程度上未得到满足。

该文中，研究人员提出了一种坚固的超微孔金属-有机框架（MET-Fe），它可以通过分子排斥分离1-丁烯异构体。孔径大小（4.6）与异构体的动力学直径精确匹配，通过静态和动力学吸附实验和理论计算进行了验证。此外，动态突破实验证实了MET-Fe在干燥和潮湿条件下都具有优异的分离性能、易于再生和显著的可重复使用性。MET-Fe具有高选择性、大穿透能力和优异的稳定性，为工业丁烯异构体分离提供了理想的平台。

附：英文原文

Title: Molecular Exclusion Separation of 1-Butene Isomers by a Robust Metal–Organic Framework under Humid Conditions

Author: Xin Huang, Shuyi Jiang, Dou Ma, Jing Xie, Xiao Feng, Bo Wang

Issue&Volume: 2023-05-31

Abstract: Separating n-butene and i-butene by adsorption is an energy-efficient alternative, but designing porous adsorbents that distinguish the subtle differences between the isomers is extremely challenging. Currently, adsorbents that can sieve 1-butene isomers and are stable enough to withstand humid gas mixtures are largely unmet. Herein, we propose a robust ultramicroporous metal–organic framework (MET-Fe) that can separate 1-butene isomers through molecular exclusion. The pore aperture size (4.6 ) precisely matches the kinetic diameters of the isomers, as verified by static and kinetic adsorption experiments and theoretical calculations. Furthermore, dynamic breakthrough experiments confirmed the excellent separation performance, easy regeneration, and remarkable reusability of MET-Fe in both dry and humid conditions. With its high selectivity, large breakthrough capacity, and outstanding stability, MET-Fe provides an ideal platform for industrial butene isomers separation.

DOI: 10.1002/anie.202303671

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202303671