Search

The field of metal–organic framework based mixed matrix membranes (M4s) is critically reviewed, with special emphasis on their application in CO2 capture during energy generation. After introducing the most relevant parameters affecting membrane performance, we define targets in terms of selectivity and productivity based on existing literature on process design for pre- and post-combustion CO2 capture. Subsequently, the state of the art in M4s is reviewed against these targets. Because final application of these membranes will only be possible if thin separation layers can be produced, the latest advances in the manufacture of M4 hollow fibers are discussed. Finally, the recent efforts in understanding the separation performance of these complex composite materials and future research directions are outlined. [ABSTRACT FROM AUTHOR]

Polymeric hollow fiber membranes represent a high degree of process intensification closer to scaling-up. Metal-organic framework ZIF-7 and ZIF-8 continuous membranes were synthesized on the inner surface of a 520 μm outer diameter polysulfone hollow fiber using microfluidics. This provided a constant reactant concentration along the membrane for growing homogeneous, continuous and thin layers of ZIF-7 (2.4 μm) and ZIF-8 (3.6 μm) with good adherence. The high quality of the membranes and the zeolite-like sodalite porous structure of both MOFs with pore apertures of 0.30–0.34 nm allowed operation at high temperature (150 °C) and pressure (4 bar). High separation factors in CO 2 and H 2 containing mixtures were achieved. [ABSTRACT FROM AUTHOR]