Modelling of water adsorption–condensation isotherms on beds of nanoparticles

In this paper, the multimolecular adsorption equation (so-called GAB equation) was modified by adding an amount of condensed water between the particles. This new model was then compared with experimental results obtained on three nanostructured powders of different nature: zinc, amorphous carbon an...

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Bibliographic Details
Published in:Chemical engineering science 2014-07, Vol.113, p.1-10
Main Authors: Ribeyre, Q., Grévillot, G., Charvet, A., Vallières, C., Thomas, D.
Format: Article
Language:English
Subjects:
Capillary condensation
Carbon
Chemical engineering
Chemical Sciences
Isotherms
Mathematical analysis
Mathematical models
Multilayer adsorption isotherms
Nanoparticles
Sorption model
Water sorption isotherms
Zinc
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Summary:In this paper, the multimolecular adsorption equation (so-called GAB equation) was modified by adding an amount of condensed water between the particles. This new model was then compared with experimental results obtained on three nanostructured powders of different nature: zinc, amorphous carbon and zinc–aluminium obtained from metallisation fumes. The influence of the particle diameter, the porosity of the sample and the importance of the determination of the GAB constant for the new equation were all studied. We found that the new model corresponds well with experimental data on almost all the range of water activity and thus increases the range of the GAB equation. Finally, the new developed model only uses three fitted GAB parameters and does not require additional adjusting parameters. •An adsorption–condensation model was developed.•This new model is applicable for non-porous and spherical particles.•Good match between theory and the experimental results.•Influence of particles diameter, bed porosity and variation of the model constants were studied.•Particle diameter is the key parameter for the determination of this model.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2014.03.027