(253g) Binary Gas Adsorption Equilibria on MIL-53(Al)

Flexible MOFs are interesting class of materials which alter their structures based on external stimulus. MIL-53(Al) is a well-studied flexible MOF that exhibits structural transformation between narrow pore (np) and large pore (lp) forms depending on suitable external stimulus/history. The phase diagrams for transformation between the two phases at various temperature/pressure/adsorbate concentrations are well documented in literature. The two pore forms have widely different adsorption characteristics for adsorption of pure gases; the np form of the framework exhibits higher capacity and selectivity to CO₂ compared to gases such as N₂ and CH^₄. Literature for extensive binary data on this MOF is scare in literature. In this work, we present the measurement and analysis of binary gas adsorption equilibria of CO₂/N₂ and CO₂/CH₄mixtures on np and lp pore forms of the MIL-53 (Al) framework.