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. 2014 Oct 9;5:5147. doi: 10.1038/ncomms6147

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(a) The experimentally measured CO₂/N₂ selectivity at 293.15 K in ZIF-8/glycol slurries (solid circles). For comparison, we have calculated the expected selectivities in the pure solid ZIF-8 phase (black lines), the pure liquid glycol phase (red lines) and the corresponding weighted average (blue lines). In these calculations, we used the ideal adsorbed solution theory (IAST)26 to predict the mixture adsorption isotherm from the experimental single-component adsorption isotherms. For these calculations, we used 15% CO₂ concentration in gas phase and a mass fraction of ZIF-8 equals to 0.152 in liquid glycol for the weighted average, (b) adsorption isotherms of CO₂, CH₄, N₂ and H₂ at 293.15 K in pure solid ZIF-8 (closed symbols) and the ZIF-8 suspended in ZIF-8/glycol slurry (open symbols).