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Abstract Membrane technology offers substantial economic and environmental benefits for energy‐intensive chemical separations. Chabazite‐type zeolite, possessing a 3‐D channel system with molecular‐sieving windows, can be an ideal membrane material, but conditions to synthesize zeolite‐only membranes limit optimization strategies. Guided by advanced quantum chemistry calculations on inner‐pore molecular interactions, zeolite properties are tailored for different separations and optimized particles incorporated in polyimide at very high loadings. A membrane platform is thus created that largely outperforms state‐of‐the‐art membranes for a broad variety of industry‐relevant applications, that is, carbon capture, natural gas/biogas purification, hydrocarbon, helium and hydrogen recovery. Accurate size‐sieving of gas molecules is realized together with rational determination of optimal gas‐zeolite interactions. Crucial for industrial applications, these well‐tuned membranes displayed excellent non‐aging properties, high flexibility and higher mixed‐gas selectivities than ideal‐gas selectivities. Moreover, they performed even better at low CO 2 ‐partial pressure in CO 2 ‐removal and can be made humidity‐insensitive.
Tan et al. (Fri,) studied this question.