Ultrapermeable Thin Film ZIF‐8/Polyamide Membrane for H2/CO2 Separation at High Temperature without Using Sweep Gas

Abstract

AbstractThe use of thin film composites containing metal–organic frameworks (MOFs) as filler is of widespread interest for nanofiltration issues, since their thin selective layer allows a high permeation flow. The application of this kind of membranes for gas separation should provide a better permeance in comparison with other polymeric membranes and a reduction in the amount of MOF required for their fabrication. Here, the preparation of 50–100 nm thick polyamide flat membranes containing zeolitic imidazolate framework‐8 (ZIF‐8) nanoparticles is shown via interfacial polymerization, containing a lower amount of MOF (0.013 g m−2 membrane) as compared to other membranes used for gas separation. The membranes are applied for H2/CO2 separation at high temperatures and pressures, showing a stable performance at 180 °C for at least seven days. Outstanding separation values are 328 GPU of H2 and a H2/CO2 selectivity of 18.1 at 180 °C and 6 bar feed without transmembrane pressure. These membranes, also measurable without sweep gas, are highly suitable for industrial application.