A Bifunctional Microporous In(III)-MOF for SF Separation and Reverse Adsorption of CH/CH.

The adsorption-separation process is important to the purification of gas components due to its high efficiency and low energy consumption, but the selection of adsorbents is quite challenging. Herein, a microporous In(III)-MOF (HBU-25) was synthesized by the reaction of (: 1,1,2,2-Tetra(4-carboxylphenyl)ethylene) ligand and In(NO)·4HO. It shows a large Brunauer-Emmett-Teller (BET) specific surface area (788.4 m g) and a suitable pore environment, exhibiting excellent gas separation performance. The adsorption capacity of SF is 47.9 cm g at ambient conditions, which is higher than that of CO (39.6 cm g) and N (3.4 cm g). The IAST selectivity of SF/N achieves 97.2. More interestingly, it also can preferentially adsorb CH (67.9 cm g) instead of CH (62.3 cm g), and the IAST selectivity of CH/CH (10:90) is calculated as 1.97. Furthermore, breakthrough experiments prove that HBU-25 can separate SF from the SF/CO/N mixture and achieve reverse adsorption of CH/CH.