Metal−Organic Framework Crystal‐Glass Composite Membranes for the Separation of Carbon Dioxide

Abstract Separating gases using membranes is appealing due to their efficiency and low energy requirements. MOF glasses combine the advantages MOFs with the processability of glasses, making them excellent materials for next‐generation membranes. The study proposes that highly effective gas separation membranes can be prepared by blending crystalline metal–organic frameworks (MOFs) into a ZIF glass matrix. A synthetic method is developed for these crystal‐glass composite membranes by ball milling ZIF‐62 with various microcrystalline MOFs followed by pressing into a tablet, heating to melt the ZIF‐62 into a glass, and subsequent cooling. This delivers membranes with homogenous dispersion of MOF particles in a ZIF glass matrix. This study also devised a low‐temperature method to create membranes comprising MOFs that have low thermal stability using a pre‐formed ZIF‐62 glass. The [MUF‐16 0.4 /a g ZIF‐62 0.6 ] membrane exhibits excellent CO 2 permeances (up to 2.0×10 5 GPU) and CO 2 /N 2 selectivities (5.7), far exceeding glass‐only membranes.