An Ultramicroporous Metal-Organic Framework with Record High Selectivity for Inverse CO2/C2H2 Separation

Abstract

Removing of CO₂ to purify CO₂/C₂H₂ mixture through porous material is a more energy saving method compared with the traditional cryogenic distillation. Those CO₂-selective adsorption porous materials are ideal for directly producing high-purity C₂H₂, especially allowing sieving separation with infinite selectivity but without sacrificing any uptake capacity. Here, we report an ultramicroporous metal–organic framework (MOF) [Cu(hfipbb)(H₂hfipbb_0.5)] (1), [H₂hfipbb is 4,4’-(hexafluoroisopropylidene) bis(benzoic acid)] has been studied for inverse separation of CO₂ from C₂H₂ under ambient conditions. This Cu-based MOF material was comprehensively demonstrated as an efficient CO₂-selective adsorbent used for C₂H₂ purification by single-component adsorption isotherms, providing its promising for the industrial acetylene purification.