Thin zeolite T/carbon composite membranes supported on the porous alumina tubes for CO2 separation

► Thin zeolite T/carbon composite membranes (about 3-4 μm) are synthesized on the porous alumina tubes. ► The CO2 separation performance is influenced by the zeolite contents and dip-coating cycles of the composite membranes. ► At 298 K, CO2/CH4 and CO2/N2 separation factors of the membrane in the equimolar mixed gas system reach to 143 and 67.1.