美国北得克萨斯州大学Shengqian Ma团队开发了一种用于高效C2H2/CO2分离的MOF基超强乙炔纳米阱。 相关研究成果于2021年1月06日发表在《德国应用化学》。

在过去的几十年中，具有开放金属位点的多孔材料被广泛地研究用于分离各种气体混合物。然而，与多个结合位点相比，目前的开放金属位点在分离物理特性非常相似的C2H2/CO2等具有挑战性的混合气体方面表现出一定的局限性。

该文中，研究人员开发了一种基于多重结合作用的新型超强C2H2“纳米陷阱”，以有效捕获C2H2分子并分离C2H2/CO2混合物。超强乙炔纳米阱显示出C2H 2的基准Q_st为79.1kJ mol^-1，在1×10-2 bar处的纯C2H2吸附量达到创纪录的2.54 mmol g-1，具有最高的C2H2/CO2的选择性（53.6），因而成为捕获C2H2和分离C2H2/CO2的新基准材料。原位单晶X射线衍射研究显示了MOF基纳米陷阱中C2H2分子的位置，该研究还确定了与C2H2强相互作用的多个结合位点。

该研究工作不仅提供了一种创纪录的C2H2吸附剂，而且提出了一种基于协同效应构建高效分离材料的新途径。

附：英文原文

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

Author: 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

Issue&Volume: 06 January 2021

Abstract: Porous materials with open metal sites have been extensively investigated to separate various gas mixtures in the last decades. However, compared with the multiple binding sites, the current open metal sites show the limitation in the separation of some challenging gas mixtures, such as C  2  H  2  /CO  2  , which have very similar physical properties. Herein, we propose a new type of ultra‐strong C  2  H  2  nano‐trap based on multiple binding interactions to efficiently capture C  2  H  2  molecules and separate C  2  H  2  /CO  2  mixture. The ultra‐strong acetylene nano‐trap shows a benchmark  Q  st  of 79.1 kJ mol  ‐1  for C  2  H  2  , a record high pure C  2  H  2  uptake of 2.54 mmol g  ‐1  at 1×10  ‐2  bar, and the highest C  2  H  2  /CO  2  selectivity (53.6), making it as a new benchmark material for the capture of C  2  H  2  and the separation of C  2  H  2  /CO  2  . The locations of C  2  H  2  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 C  2  H  2  . Our work not only provides a record C  2  H  2  adsorbent but also suggests a new approach to construct efficient separation materials based on synergistic effect.

DOI: 10.1002/anie.202016225

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202016225