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Influence of surface heterogeneity on hydrogen adsorption on activated carbons

Llorens, Joan and Pera-Titus, Marc 2009. Influence of surface heterogeneity on hydrogen adsorption on activated carbons. Colloids and Surfaces A: Physicochemical and Engineering Aspects 350 (1-3) , pp. 63-72. 10.1016/j.colsurfa.2009.08.035

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Abstract

This study presents an experimental and theoretical analysis of the effect of surface heterogeneity on the capacity of 20 commercial activated carbons to adsorb hydrogen at 77 and 258 K and for maximum pressures of 20 bar. Some of the samples have been subjected to surface modification by impregnation or by surface oxidation prior to the hydrogen adsorption measurements. All the activated carbons have been analyzed by N2 adsorption at 77 K using the thermodynamic isotherm presented in a previous study. The hydrogen adsorption capacity of the activated carbons has been well correlated to the micropore volume and the characteristic m2 parameter of the thermodynamic isotherm accounting for the energy heterogeneity of the material. On the basis of the model presented here, we discuss how surface heterogeneity, in addition to the adsorption strength, might affect the ability of activated carbons and related materials to adsorb hydrogen.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Elsevier
ISSN: 0927-7757
Date of Acceptance: 28 August 2009
Last Modified: 13 Oct 2020 13:15
URI: http://orca.cardiff.ac.uk/id/eprint/135408

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