Modification of free-energy density functional theory approach for prediction of high-pressure mixture adsorption

作者：Liu ShuYan; Yang XiaoNing^*; Yang Zhen

来源：Chinese Science Bulletin, 2008, 53(9): 1358-1364.

DOI：10.1007/s11434-007-0527-z

• high-pressure adsorption
• carbons
• slit-pore
• free-energy density functional theory

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 (approximate to 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, CH(4)/N(2) and CO(2)/N(2), 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.

• 出版日期2008-5
• 单位南京工业大学