Mixture equilibrium and kinetics of flue gas components in CALF-20

Abstract

Binary and ternary mixture equilibrium and kinetic data for CO₂, N₂ and H₂O in CALF-20 particles over a wide range of temperatures (25–150 ⁰C), gas concentrations and relative humidity levels (0–90%) is presented. Data is obtained from the dynamic column breakthrough (DCB) method. Proposed empirically modified extended Sips – Henry equilibrium isotherm model reliably describes mixture equilibrium. The single component isotherm parameters are retained and new parameters from the empirical modification are calibrated with binary mixture data. The mixture isotherm model correctly predict measured ternary equilibrium data for CO₂/H₂O/N₂ mixtures. The linear driving force (LDF) mass transfer model with the rate constants calculated for Knudsen controlled macropore transport mechanism and equilibrium data from the mixture model accurately predict binary and ternary mixture breakthrough responses. The isosteric heat of adsorption for H₂O in the presence of N₂, CO₂ and helium elucidate adsorbate-adsorbent and adsorbate–adsorbate interactions.