Investigation of SIFSIX-3-Ni Membranes for CO2/N2 Separation

The pressing need to address climate change has necessitated the development of advanced technologies for CO 2 separation and capture. Existing separation techniques including scrubbing and cryogenic distillation are often limited by scalability challenges and operational costs in contrast to membrane-based separations. Herein, we report the separation of CO 2 from N 2 using ultramicroporous SIFSIX-3-Ni MOF membranes. We investigated the influences of membrane composition and thickness on gas permeance and separation efficiency. SIFSIX-3-Ni membranes resulted in a CO 2 permeance of 105.33 × 10 –7 mol/m 2 s Pa and a CO 2 /N 2 selectivity of 8. Following up to 4 h of exposure to lab air, the SIFISX-3-Ni membranes did not show any decline in separation performance, confirming its stability. Comparison of membrane performances for 10, 20, 30, and 60 cycles further highlights the importance of synthesis optimization.