Abstract
In this paper, we present the adsorption data of two ternary mixtures (H2-N2-CO2 and H2-CH4-CO2) on MOF-5 and CuBTC, obtained via a recirculating volumetric method. The measurements were performed along constant composition and constant pressure domains. The constant pressure data outlines the existence of one-component azeotrope-like crossovers in the adsorbed phase diagrams. Such azeotropic behaviours are related to the deviation between selectivities in the ternary and the equivalent binary mixtures. Furthermore, the capabilities of three models, Extended Langmuir, Extended Toth and Ideal Adsorption Solution Theory (IAST), to predict the ternary mixture adsorption from pure-component data are discussed.
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