A MOF‐based Ultra‐Strong Acetylene Nano‐trap for Highly Efficient C2H2/CO2 Separation

作者：Zheng Niu, Xili Cui, Tony Pham, Gaurav Verma, Pui Ching Lan, Chuan Shan, Huabin Xing, Katherine A. Forrest, Shanelle Suepaul, Brian Space, Ayman Nafady, Abdullah M. Al‐Enizi, Shengqian Ma · 发表于：Angewandte Chemie International Edition · 年份：2021 · DOI：10.1002/anie.202016225 · 被引用次数：291 · 研究领域：Metal-Organic Frameworks: Synthesis and Applications、Covalent Organic Framework Applications、Inorganic Fluorides and Related Compounds

Abstract Porous materials with open metal sites have been investigated to separate various gas mixtures. However, open metal sites show the limitation in the separation of some challenging gas mixtures, such as C2H2/CO2. Herein, we propose a new type of ultra‐strong C2H2 nano‐trap based on multiple binding interactions to efficiently capture C2H2 molecules and separate C2H2/CO2 mixture. The ultra‐strong acetylene nano‐trap shows a benchmark Qst of 79.1 kJ mol−1 for C2H2, a record high pure C2H2 uptake of 2.54 mmol g−1 at 1×10−2 bar, and the highest C2H2/CO2 selectivity (53.6), making it as a new benchmark material for the capture of C2H2 and the separation of C2H2/CO2. The locations of C2H2 molecules within the MOF‐based nanotrap have been visualized by the in situ single‐crystal X‐ray diffraction studies, which also identify the multiple binding sites accountable for the strong interactions with C2H2.