Adsorption and desorption of gaseous sorbates on a bidispersed particle with Freundlich isotherm. III. Contribution of surface diffusion to the sorption dynamics of sulphur dioxide on activated carbon

Gray P.G. and Do D.D. (1990) Adsorption and desorption of gaseous sorbates on a bidispersed particle with Freundlich isotherm. III. Contribution of surface diffusion to the sorption dynamics of sulphur dioxide on activated carbon. Gas Separation and Purification, 4 3: 149-157. doi:10.1016/0950-4214(90)80017-F


Author Gray P.G.
Do D.D.
Title Adsorption and desorption of gaseous sorbates on a bidispersed particle with Freundlich isotherm. III. Contribution of surface diffusion to the sorption dynamics of sulphur dioxide on activated carbon
Journal name Gas Separation and Purification
ISSN 0950-4214
Publication date 1990-01-01
Sub-type Article (original research)
DOI 10.1016/0950-4214(90)80017-F
Volume 4
Issue 3
Start page 149
End page 157
Total pages 9
Subject 1500 Chemical Engineering
Abstract A theoretical single particle sorption model incorporating the mechanisms of micropore, macropore and surface diffusion, together with equilibrium (Freundlich isotherm) at the micropore mouth, was developed. The model was fitted to experimentally determined sorption of SO2 on activated carbon particles over a range of temperatures, concentrations and particle sizes. The model fitted the experimental data well, and typical extracted values of the diffusivities at 25°C were D/R2 μ = 0.017 s-1 (micropore), Dp = 0.038 cm2 s-1 (macropore) and Ds = 1.0 × 10-5 cm2 s-1 (surface). The value of macropore diffusivity gave a tortuosity factor of 8.0, whilst the temperature dependence of the micropore and surface diffusivities gave activation energies of 4.2 and 5.0 kJ mol-1, respectively. This model including all three diffusion mechanisms was found to better predict adsorption and desorption over a range of temperatures, than did a previous model that omitted the surface diffusion mechanism.
Keyword activated carbon
adsorption
bidispersed sorbent
SO2
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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