Using local IAST with micropore size distribution to predict desorption and displacement kinetics of mixed gases in activated carbon

Qiao, Shizhang and Hu, Xijun (2003) Using local IAST with micropore size distribution to predict desorption and displacement kinetics of mixed gases in activated carbon. Separation and Purification Technology, 31 1: 19-30. doi:10.1016/S1383-5866(02)00160-0


Author Qiao, Shizhang
Hu, Xijun
Title Using local IAST with micropore size distribution to predict desorption and displacement kinetics of mixed gases in activated carbon
Journal name Separation and Purification Technology   Check publisher's open access policy
ISSN 1383-5866
Publication date 2003-04
Sub-type Article (original research)
DOI 10.1016/S1383-5866(02)00160-0
Volume 31
Issue 1
Start page 19
End page 30
Total pages 12
Place of publication Amsterdam
Publisher Elsevier Science Bv
Language eng
Subject 0301 Analytical Chemistry
0904 Chemical Engineering
Abstract A mathematical model utilizing ideal adsorbed solution theory (IAST) and micropore size distribution (MPSD) concept to describe the adsorption equilibrium and surface energetic heterogeneity is used to predict the desorption and displacement kinetics of mixed gases in activated carbon. The model takes into account the intraparticle diffusion in both pore volume and adsorbed phase. The driving force for surface diffusion is the chemical potential gradient, and the apparent surface diffusivity is a function of the adsorbed concentration. The adsorbate-adsorbent interaction energy is related to the micropore size by the Lennard-Jones potential, and the matching energies between different species in the adsorbed phase are therefore described by this adsorbate-pore interaction mechanism in both equilibrium and diffusion of the adsorbed species. The overall adsorption isotherm and the diffusion flux of the adsorbed species are the integrals of their corresponding local values over all MPSD range accessible by the adsorbate molecules. The size exclusion effect is taken into account in the competition of the different gases for the given pore. The model parameters are obtained using only information of pure gas equilibrium and mass transfer. The model predictions are tested with the desorption and displacement kinetics data of binary gases on Ajax activated carbon and found to be in good agreement with the experimental data. (C) 2002 Elsevier Science B.V. All rights reserved.
Keyword Engineering, Chemical
activated carbon
adsorption
desorption
displacement
IAST
kinetics
pore size distribution
Binary Adsorption-kinetics
Energy-distribution
Structural Heterogeneity
Sorption Kinetics
Model Micropores
Equilibrium
Hydrocarbons
Mixtures
Surfaces
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Wed, 17 Oct 2007, 11:57:08 EST