Modification of free-energy density functional theory approach for prediction of high-pressure mixture adsorption |
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Authors: | ShuYan Liu XiaoNing Yang Zhen Yang |
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Affiliation: | (1) School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, 210009, China;(2) College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing, 210009, China |
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Abstract: | A modified non-local free energy density functional theory (NDFT) model, with the consideration of the nonadditivity term
of solid-fluid and fluid-fluid interactions and finite pore wall thickness (≈2 layers), was developed to model the confined
fluid mixtures in slit pore. This improved NDFT approach, combining with the pore size distribution (PSD) analysis of adsorbent
material can be applied to predicting the adsorption equilibria of high-pressure gas mixtures on activated carbon. Compared
with the conventional NDFT method, this new approach partly improves the correlation performance of adsorption equilibrium
for pure species and increases the reliability of the PSD analysis. For the mixtures, CH4/N2 and CO2/N2, a relatively improved performance has been observed for the adsorption equilibrium prediction of the mixtures under high-pressure
conditions, especially for the weakly adsorbed species.
Supported by the National Natural Science Foundation of China (Grant Nos. 20276028 and 20476044) |
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Keywords: | high-pressure adsorption carbons slit-pore free-energy density functional theory |
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