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Application of the isotherm subtraction and preadsorption methods to activated carbons

✍ Scribed by J.M. Martín-Martínez; F. Rodríguez-Reinoso; M. Molina-Sabio; B. McEnaney

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
518 KB
Volume
24
Category
Article
ISSN
0008-6223

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✦ Synopsis

The microporous contribution to adsorption of N2 at 77 K for two series of activated carbons was estimated using the isotherm subtraction and nonane preadsorption methods and three classes of carbons were identified.

(i) For carbons with very narrow micropores the isotherm subtraction method gives very similar results to nonane preadsorption. (ii) When the distribution of micropore size is wider, the preadsorption method fails because nonane is not retained in some wide micropores. In such cases the subtraction method applied to the total isotherm and the NP residual isotherm gives good agreement. (iii) For superactivated carbons with a very wide pore size of distribution extending to mesopores, it is not possible to obtain good agreement between the two methods, because nonane is not retained in some wide micropores and there is no linear range in the total and residual isotherms when plotted in DR coordinates.

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