Random organic framework membranes with hierarchical channels for H2 separation

Novel membrane materials for H2 separation are wanted. How to overcome the "trade-off" between membrane permeability and selectivity is a tough challenge. Here we report new random organic framework membranes with benzimidazole and imine linkages to form hierarchical channels. Both high H2-selective and fast H2 transport pathways are created. The preparation parameters are thoroughly studied and the membrane structures are well characterized by SEM, AFM, NMR, XPS, gas sorption, etc. Effect of feed conditions on membrane performance, such as composition, pressure and temperature, is investigated. The membrane performance transcends the upper bounds of H2/CO2, H2/N2 and H2/CH4 with excellent stability.