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SIFSIX-3, containing a coordinative complex of hexafluorosilicate, transition metal ions, and the organic ligands, is a subclass of metal-organic frameworks (MOFs). SIFSIX-3 is considered a high capacity adsorbent for CO2 capture due to the enriched interaction sites of fluoride groups in SIFSIX. Also, SIFSIX-3-Zn is known to have an appropriate effective aperture size for efficient CO2/CH4 separation. In this work, we successfully incorporated different metal-based SIFSIX-3 crystallites into polyimide (PI) matrix and demonstrated that the associated mixed matrix membranes improved CO2/N2, CO2/CH4 and CO2/CO separation performance compared to pristine polyimide membranes due to the excellent molecular sieving behaviors of SIFSIX crystallites.
