美国北德克萨斯大学Shengqian Ma团队提出了通过动态间隔安装多功能装置的金属-有机框架纳米空间工程实现乙烷/乙烯混合物中的乙烷的有效分离。 相关研究成果于2021年2月02日发表在《德国应用化学》。

由于乙烷/乙烯混合物具有相似的物理化学性质，从中分离乙烷是石油化工中一个迫切而又极具挑战性的过程。

该文中，研究人员通过动态间隔安装（DSI）策略，构建了一系列的多功能MOFs，即LIFM-61 / 31/62/63，这些MOFs具有优化的孔空间和孔环境，可用于乙烷/乙烯分离。在该方面，在原型MOF LIFM-28中故意安装了一系列线性二羧酸，导致孔体积显著增加（从0.41到0.82 cm ³ g^-1）和孔径减小（从11.1×11.1 ²到5.6×5.6 ²）。

增加的孔体积赋予了多功能MOF更高的乙烷吸附能力，尤其是对于LIFM-63（4.8 mmol g^-1），在273 K和1 bar条件下，其乙烷吸附量几乎是原型MOF（1.7 mmol g^-1）的三倍。同时，减小的孔径提高了多功能MOFs的乙烷/乙烯选择性。理论计算和动态突破实验证实，DSI是一种很有前途的应对艰巨任务的多功能MOFs的合理设计方法。

附：英文原文

Title: Nanospace Engineering of Metal‐Organic Frameworks through Dynamic Spacer Installation of Multi‐functionalities for Efficient Separation of Ethane from Ethane/Ethylene Mixture

Author: Cheng-Xia Chen, Zhang-Wen Wei, Tony Pham, Pui Ching Lan, Lei Zhang, Katherine A. Forrest, Sha Chen, Abdullah M. Al-Enizi, Ayman Nafady, Cheng-Yong Su, Shengqian Ma

Issue&Volume: 02 February 2021

Abstract: The separation of ethane from ethane/ethylene mixture is imperative and extremely challenging process in petrochemical industry due to their similar physicochemical properties. Herein, a dynamic spacer installation (DSI) strategy has been implemented to construct a series of multi‐functional MOFs, LIFM‐61/31/62/63, with optimized pore space and pore environment for ethane/ethylene separation. In this respect, a series of linear dicarboxylic acids were deliberately installed in the prototype MOF, LIFM‐28, leading to a dramatically increased pore volume (from 0.41 to 0.82 cm  3  g  ‐1  ) and reduced pore size (from 11.1 × 11.1  2  to 5.6 ×5.6  2  ). The increased pore volume endows the multi‐functional MOFs with much higher ethane adsorption capacity, especially for LIFM‐63 (4.8 mmol g  ‐1  ), representing nearly three times as much ethane as the prototypical counterpart (1.7 mmol g  ‐1  ) at 273 K and 1 bar. Meanwhile, the reduced pore size imparts enhanced ethane/ethylene selectivity to the multi‐functional MOFs. Theoretical calculations and dynamic breakthrough experiments confirm that the DSI is a promising approach for rational design of multi‐functional MOFs for this challenging task.

DOI: 10.1002/anie.202100114

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202100114