The separation of light olefins from paraffins using membrane technology is highly desired; however, synthetic polymer membranes generally suffer a pernicious trade-off between permeability and selectivity. Herein, we show that this limitation can be overcome by constructing selective gas transfer pathways in a polymer matrix, as demonstrated by incorporating composites of ionic liquids and zeolitic imidazolate frameworks (ZIFs) to form mixed-matrix membranes. Using propylene/propane separation as a model system, dramatic improvements in the propylene permeability of 218.4 Barrer and propylene/propane separation factor of 45.7 were achieved compared to the values obtained using individual components as a filler. The synergy between the high solubility of the gas molecules in ionic liquids and the size screening ability of ZIF exacerbates the difference in the transmission of propylene and propane, thus leading to superior separation performance. This work presents a promising strategy for the design of membranes for efficient gas separation.
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Article Synopsis
- Filler morphology control significantly improves gas separation in mixed matrix membranes (MMMs) through the design of a vertical transport channel utilizing crystal twinning in ZIF nanoplate.
- Twinned ZIF-8 (TZIF-8) enhances propylene/propane separation when added to 6FDA-DAM polymer, achieving a propylene permeability of 40 Barrer and selectivity of 82.
- The study indicates that the structure of the TZIF-8 provides effective pathways for desired gas molecules while creating barriers for undesired ones, outperforming previous MMMs and matching polycrystalline ZIF-8 membranes.
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