Acid-Base-Resistant Metal-Organic Framework for Size-Selective Carbon Dioxide Capture.

The development of practical porous materials for the selective capture of CO from flue gas and crude biogas is highly critical for both environment protection and energy safety. Here, a novel metal-organic framework () has been prepared, which not only has excellent acid-base resistance but also possesses polar micropores (3.4-4.3 Å) that can match CO molecules well. can selectively capture CO from N and CH with excellent separation efficiency and suitable adsorption enthalpy under ambient conditions. Breakthrough experiments further confirm its practicability for both CO/N and CO/CH separation. All of these confirm is a practical CO adsorbent. Modeling calculations reveal that the confinement effect of micropores and the polar environment synergistically promotes the selective adsorption of CO, which will provide a potential strategy for the synthesis of a practical metal-organic framework for CO capture.