浙江大学材料科学与工程学院Bin Li研究团队提出了具有适当的孔隙限制的棒形填充氢键有机框架，用于基准乙烷/乙烯分离。 相关论文发表在2021年2月25日出版的《德国应用化学》杂志上。

在本文中，研究人员报道了在一个不稳定的氢键有机骨架中可逆的固态转变，从而产生一种新的棒填料脱溶骨架(ZJU‐HOF‐1)，从而产生合适的空腔空间和功能表面，以优化地与C₂H₆相作用。ZJU‐HOF‐1从而表现出同时的高C₂H₆的吸收（0.5 bar及298 K下为88 cm³g^‐1）及对C₂H₆/C₂H₄高选择性（2.25），显著高于HOF-76a和最优表现的材料。

理论计算表明，与C₂H₄相比，合适的笼状空腔和功能位点能够更好地与C₂H₆协同“匹配”，并与C₂H₆提供更强的多点相互作用。结合其高稳定性和超低吸水率，该材料可从50/50 C₂H₆/C₂H₄混合物中在60%RH任意条件下高效捕获C₂H₆，提供了至今为止聚合物级C₂H₄的0.98 mmol g^-1的生产率记录，正如这些突破性实验所证明的。

研究人员表示，发现用于从乙烯中分离乙烷的新材料是化工行业的一个关键努力。在C₂H₆选择性材料中同时具有高C₂H₆吸收和选择性仍是一项艰巨的挑战。

附：英文原文

Title: A Rod‐Packing Hydrogen‐Bonded Organic Framework with Suitable Pore Confinement for Benchmark Ethane/Ethylene Separation

Author: Banglin Chen, Xu Zhang, Jia-Xin Wang, Libo Li, Jiyan Pei, Rajamani Krishna, Hui Wu, Wei Zhou, Guodong Qian, Bin Li

Issue&Volume: 2021-02-25

Abstract: The discovery of new materials for separating ethane from ethylene is a critical enterprise in the chemical industry. It still remains a daunting challenge to target both high C₂H₆ adsorption and selectivity in a C₂H₆‐selective material. Herein, we report a reversible solid‐state transformation in a labile hydrogen‐bonded organic framework to generate a new rod‐packing desolvated framework (ZJU‐HOF‐1), leading to the suitable cavity spaces and functional surfaces to optimally interact with C₂H₆. ZJU‐HOF‐1 thus exhibits simultaneously high C₂H₆ uptake (88 cm³g^‐1  at 0.5 bar and 298 K) and C₂H₆/C₂H₄  selectivity (2.25), notably higher than HOF‐76a and most of top‐performing materials. Theoretical calculations reveal that the suitable cage‐like cavities and functional sites to synergistically “match” better with C₂H₆ provide stronger multipoint interactions with C₂H₆ thanC₂H₄. In combination with its high stability and ultralow water uptake, this material can efficiently capture C₂H₆ from 50/50 C₂H₆/C₂H₄ mixtures at ambient conditions under 60% RH, providing a record polymer‐grade C₂H₄  productivity of 0.98 mmol g^‐1  reported so far, as evidenced through the breakthrough experiments.

DOI: 10.1002/anie.202100342

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202100342