The combined use of different approaches in the characterization of microporous carbons

Adsorption of N 2 (77 K), CO 2 (273 K), and several hydrocarbons (273 or 298 K) and n-nonane preadsorption for two series of activated carbons with more-or-less distorted type I isotherms have been analyzed by the Dubinin-Radushkevich (D-R), Langmuir, and α s methods. When the microporosity is narro...

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Bibliographic Details
Published in:Carbon (New York) 1989, Vol.27 (1), p.23-32
Main Authors: Rodríguez-Reinoso, F., Garrido, J., Martín-Martínez, J.M., Molina-Sabio, M., Torregrosa, R.
Format: Article
Language:English
Subjects:
adsorption isotherms
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
isotherm analysis
Porosity
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Summary:Adsorption of N 2 (77 K), CO 2 (273 K), and several hydrocarbons (273 or 298 K) and n-nonane preadsorption for two series of activated carbons with more-or-less distorted type I isotherms have been analyzed by the Dubinin-Radushkevich (D-R), Langmuir, and α s methods. When the microporosity is narrow and uniform, all theoretical and experimental approaches lead to values of micropore volume that are in good agreement. For carbons with wide micropore size distributions the Langmuir, α s and D-R methods applied to N 2 (77 K) (if for the latter a straight portion in the D-R plot can be drawn in the 0.05–0.3 range of relative pressure) yield the total micropore volume (as the conventional D-R plots for hydrocarbons) whereas n-nonane preadsorption and CO 2 give the volume corresponding to narrow micropores, in this way allowing a more complete characterization of the microporosity.
ISSN:0008-6223
1873-3891
DOI:10.1016/0008-6223(89)90153-X