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- W4380322748 abstract "A carbon molecular sieve (CMS) membrane was prepared via a co-polyimide precursor containing a crown ether segment. Two elements ensured that the CMS membrane achieved both high permeability and selectivity: (1) preferential decomposition of the crown ether segment at relative low temperature and (2) the transformation of a pore structure from a micropore (>7 Å) to an ultra-micropore (<7 Å) at a higher-temperature pyrolysis. A BET analysis showed the CMS membrane formed a micropore below 500 °C. Then, the micropore structure gradually transformed to an ultra-micropore when the heat-treatment temperature raised to 500 and 650 °C, followed by formation of a single-distribution ultra-micropore pyrolyzed at 800 °C. The performance of membranes treated at 650 and 800 °C surpassed the 2015 upper bound for H2 separation and the 2019 upper bound for CO2 separation. Furthermore, the membrane treated at 650 °C exhibited remarkable mixed-gas separation performance and possessed a CO2 permeability of 7266.4 ± 22.85 to 7496.3 ± 22.34 barrer and a CO2/N2 (20/80, vol%) and CO2/CH4 (10/90, vol%) selectivity of ∼60." @default.
- W4380322748 created "2023-06-13" @default.
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- W4380322748 date "2023-06-12" @default.
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- W4380322748 title "High-Performance Carbon Molecular Sieve Membrane Derived from a Crown Ether-Containing Co-Polyimide Precursor for Gas Separation" @default.
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- W4380322748 doi "https://doi.org/10.1021/acs.iecr.3c01004" @default.
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