The synthesis of continuous cobalt–adeninate MOF (bio-MOF-13 (I) and bio-MOF-14 (II)) membranes supported on porous alumina tubes is demonstrated. The membranes showed high CO2 permeabilities and low to moderate CO2 separation selectivities for CO2/CH4 gas mixtures. The observed CO2/CH4 selectivities are attributed to preferential CO2 adsorption within the framework.
