A new perchlorate-based hybrid ultramicroporous material with rich bare oxygen atoms for high C_(2)H_(2)/CO_(2)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(ZJU-194a)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.