A New Perchlorate-Based Hybrid Ultramicroporous Material with Rich Bare Oxygen Atoms for High C2H2/CO2 Separation

Adsorptive separation of acetylene(C2H2)from carbon dioxide(CO2)is of great significance in petro-chemical 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 ultramicrop-orous 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 C2H2,but blocks off the further uptake of CO2.It thus exhibits a very high C2H2/CO2 selectivity(22.4)at ambient conditions,which is superior to most reported MOF materials.Its complete separation for 50/50 C2H2/CO2 mixtures is further evidenced by the dynamic breakthrough experiments.