A Robust Zeolitic Imidazolate Framework Membrane with High H 2 /CO 2 Separation Performance under Hydrothermal Conditions.

An upsurge in searching membranes with high selectivity, permeability, and stability, which have been considered to be promising in the membrane-based gas separation process, has received huge attentions in academia and industry. In this work, we demonstrated a new molecular sieving ZIF membrane, which has a unique mixed-ligand ZIF structure constructed by two bulk imidazolate linkers within the zeolite GIS topology, resulting in appropriate aperture size, strong affinity to CO ₂ , exceptional thermal and chemical stabilities, and superhydrophobic properties. Benefited from these features, the resulting JUC-160 membrane indeed exhibited remarkable separation efficiency and stability, with excellent H ₂ /CO ₂ selectivity of 26.3 and considerable H ₂ permeance of 9.75 × 10 ^-7 mol m ^-2 s ^-1 Pa ^-1 under high temperature up to 200 °C. Furthermore, owing to its superhydrophobicity, the JUC-160 membrane could maintain its prominent separation performance even with the presence of steam.