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A hybrid perturbed-chain SAFT density functional theory for representing fluid behavior in nanopores
State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology.
LuleƄ University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology.
2013 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 138, no 22, 224706- p.Article in journal (Refereed) Published
Abstract [en]

A hybrid statistical mechanical model, which is fully consistent with the bulk perturbed-chain statistical associating fluid theory (PC-SAFT) in describing properties of fluids, was developed by coupling density functional theory with PC-SAFT for the description of the inhomogeneous behavior of real chain molecules in nanopores. In the developed model, the modified fundamental measure theory was used for the hard sphere contribution; the dispersion free energy functional was represented with weighted density approximation by averaging the density in the range of interaction, and the chain free energy functional from interfacial statistical associating fluid theory was used to account for the chain connectivity. Molecular simulation results of the density profile were compared with model prediction, and the considerable agreement reveals the reliability of the proposed model in representing the confined behaviors of chain molecules in an attractive slit. The developed model was further used to represent the adsorptions of methane and carbon dioxide on activated carbons, in which methane and carbon dioxide were modeled as chain molecules with the parameters taken from the bulk PC-SAFT, while the parameters of solid surface were obtained from the fitting of gas adsorption isotherms measured experimentally. The results show that the model can reliably reproduce the confined behaviors of physically existing substances in nanopores.

Place, publisher, year, edition, pages
2013. Vol. 138, no 22, 224706- p.
Research subject
Energy Engineering
URN: urn:nbn:se:ltu:diva-6405DOI: 10.1063/1.4808160Local ID: 4a12cbac-8a4f-411e-976e-c98d62dfae9dOAI: diva2:979290
Validerad; 2013; Bibliografisk uppgift: Article number224706; 20130627 (ysko)Available from: 2016-09-29 Created: 2016-09-29Bibliographically approved

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