Abstract
The high structural diversity and porosity of metal-organic frameworks (MOFs) promote their applications in selective gas adsorption. The development of robust MOFs that are stable against corrosive SO(2) remains a daunting challenge. Here, we report a highly robust aluminum-based MOF (HIAM-330) built on a 4-connected Al(3)(OH)(2)(COO)(4) cluster and 8-connected octacarboxylate ligand with a (4,8)-connected scu topology. It exhibits a fully reversible SO(2) uptake of 12.1 mmol g(-1) at 298 K and 1 bar. It is capable of selective capture of SO(2) over other gases (CO(2), CH(4), and N(2)) with high adsorption selectivities of 60, 330, and 3537 for equimolar mixtures of SO(2)/CO(2), SO(2)/CH(4), and SO(2)/N(2), respectively, at 298 K and 1 bar. Breakthrough measurements verified the capability of HIAM-330 for selective capture of SO(2) (2500 ppm) over CO(2) or N(2). High-resolution synchrotron X-ray powder diffraction of SO(2) loaded HIAM-330 revealed the binding domains of adsorbed SO(2) molecules and host-guest interactions.