Vacancy solution theory for binary adsorption equilibria in heterogeneous carbon

Ding, L. P. and Bhatia, S. K. (2002) Vacancy solution theory for binary adsorption equilibria in heterogeneous carbon. Aiche Journal, 48 9: 1938-1956. doi:10.1002/aic.690480911

Author Ding, L. P.
Bhatia, S. K.
Title Vacancy solution theory for binary adsorption equilibria in heterogeneous carbon
Journal name Aiche Journal   Check publisher's open access policy
ISSN 0001-1541
Publication date 2002-01-01
Year available 2002
Sub-type Article (original research)
DOI 10.1002/aic.690480911
Open Access Status Not yet assessed
Volume 48
Issue 9
Start page 1938
End page 1956
Total pages 19
Place of publication USA
Publisher AIChE
Language eng
Subject C1
290699 Chemical Engineering not elsewhere classified
780199 Other
Abstract A heterogeneous modified vacancy solution model of adsorption developed is evaluated. The new model considers the adsorption process through a mass-action law and is thermodynamically consistent, while maintaining the simplicity in calculation of multicomponent adsorption equilibria, as in the original vacancy solution theory. It incorporates the adsorbent heterogeneity through a pore-width-related potential energy, represented by Steele's 10-4-3 potential expression. The experimental data of various hydrocarbons, CO2 and SO2 on four different activated carbons - Ajax, Norit, Nuxit, and BPL - at multiple temperatures over a wide range of pressures were studied by the heterogeneous modified VST model to obtain the isotherm parameters and micropore-size distribution of carbons. The model successfully correlates the single-component adsorption equilibrium data for all compounds studied on various carbons. The fitting results for the vacancy occupancy parameter are consistent with the pressure change on different carbons, and the effect of pore heterogeneity is important in adsorption at elevated pressure. It predicts binary adsorption equilibria better than the IAST scheme, reflecting the significance of molecular size nonideality.
Keyword Engineering, Chemical
Micropore-size Distribution
Density-functional Theory
Activated Carbon
Isotherm Equation
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemical Engineering Publications
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Created: Wed, 15 Aug 2007, 04:28:55 EST