Synthesis of thin amine-functionalized MIL-53 membrane with high hydrogen permeability

► A thin functionalized MIL-53 membrane was prepared on a porous α-Al2O3 support. ► The seeded α-Al2O3 support plays the key role in the formation of compact membranes. ► Hydrogen permeance of the membrane reached a remarkable value at room temperature. ► The ideal H2/CO2 selectivity of the as-prepared membrane was found to be 4.4.