A new perchlorate-based hybrid ultramicroporous material with rich bare oxygen atoms for high C₂H₂/CO₂ separation

Adsorptive separation of acetylene (C 2 H 2 ) from carbon dioxide (CO 2 ) is of great significance in petrochemical industry, but still remains as a daunting challenge by reason of their very similar molecular sizes/shapes and physical properties. Herein, we reported a new perchlorate-based hybrid ultramicroporous material ZJU-194 that features the unique flexible-robust network decorated with rich bare oxygen atoms. By integrating the refined pore space as well as specific binding sites, the activated ZJU-194 (ZJU194a) enables a selective two-step gate-opening adsorption toward C 2 H 2 , but blocks off the further uptake of CO 2 . It thus exhibits a very high C 2 H 2 /CO 2 selectivity (22.4) at ambient conditions, which is superior to most reported MOF materials. Its complete separation for 50/50 C 2 H 2 /CO 2 mixtures is further evidenced by the dynamic breakthrough experiments.& COPY; 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.