Abstract

CO2 permeation through an alkali carbonate-based membrane is interpreted as a combined absorption-desorption process driven by alkali ion diffusion in which the membrane material is actively involved by dissociation and re-formation. The relationships governing the gas permeation fluxes are derived for the most general case, on which basis the conditions for maximizing the CO2-to-O2 separation factor are discussed in terms of the electronic conduction properties of the membrane material.

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