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- W2945245581 abstract "Although polycrystalline metal-organic framework (MOF) membranes offer several advantages over other nanoporous membranes, thus far they have not yielded good CO2 separation performance, crucial for energy-efficient carbon capture. ZIF-8, one of the most popular MOFs, has a crystallographically determined pore aperture of 0.34 nm, ideal for CO2 /N2 and CO2 /CH4 separation; however, its flexible lattice restricts the corresponding separation selectivities to below 5. A novel postsynthetic rapid heat treatment (RHT), implemented in a few seconds at 360 °C, which drastically improves the carbon capture performance of the ZIF-8 membranes, is reported. Lattice stiffening is confirmed by the appearance of a temperature-activated transport, attributed to a stronger interaction of gas molecules with the pore aperture, with activation energy increasing with the molecular size (CH4 > CO2 > H2 ). Unprecedented CO2 /CH4 , CO2 /N2 , and H2 /CH4 selectivities exceeding 30, 30, and 175, respectively, and complete blockage of C3 H6 , are achieved. Spectroscopic and X-ray diffraction studies confirm that while the coordination environment and crystallinity are unaffected, lattice distortion and strain are incorporated in the ZIF-8 lattice, increasing the lattice stiffness. Overall, RHT treatment is a facile and versatile technique that can vastly improve the gas-separation performance of the MOF membranes." @default.
- W2945245581 created "2019-05-29" @default.
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- W2945245581 date "2019-05-14" @default.
- W2945245581 modified "2023-10-17" @default.
- W2945245581 title "Restricting Lattice Flexibility in Polycrystalline Metal–Organic Framework Membranes for Carbon Capture" @default.
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- W2945245581 doi "https://doi.org/10.1002/adma.201900855" @default.
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