Nanosheets of a Layered Metal-Organic Framework for Separation of CO/CH using Mixed Matrix Membranes.

Mixed matrix membranes represent an important technology for gas separations. Nanosheets of metal-organic framework (MOF) materials of high aspect ratio and size-selective gas transport properties have the potential to promote the efficient mixing of components to form membranes for gas separation. Herein, we report a bottom-up synthesis of extended sheets of kagomé (kgm) topology, , via the linkage of [Cu(OCR)] paddlewheels with 5--butylisophthalic acid. The growth of the layered structure can be controlled by the choice of solvent and modulator. Nanosheets of of average thickness of 20 nm and aspect ratio of 40 to 50 can be obtained, and the sieving effect of the channels in boost the efficient separation of CO over CH. A mixed matrix membrane comprising nanosheets with Matrimid shows a 32% enhancement in CO/CH selectivity compared with the membrane incorporating the MOF in the particulate form.