Supercritical hydrogen adsorption in nanostructured solids with hydrogen density variation in pores

Jessica E. Sharpe, Nuno Bimbo, Valeska P. Ting, Andrew D. Burrows, Dongmei Jiang, Timothy J. Mays*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Experimental excess isotherms for the adsorption of gases in porous solids may be represented by mathematical models that incorporate the total amount of gas within a pore, a quantity which cannot easily be found experimentally but which is important for calculations for many applications, including adsorptive storage. A model that is currently used for hydrogen adsorption in porous solids has been improved to include a more realistic density profile of the gas within the pore, and allows calculation of the total amount of adsorbent. A comparison has been made between different Type I isotherm equations embedded in the model, by examining the quality of the fits to hydrogen isotherms for six different nanoporous materials. A new Type I isotherm equation which has not previously been reported in the literature, the Unilan-b equation, has been derived and has also been included in this comparison study. These results indicate that while some Type I isotherm equations fit certain types of materials better than others, the Tóth equation produces the best overall quality of fit and also provides realistic parameter values when used to analyse hydrogen sorption data for a model carbon adsorbent.

Original languageEnglish
Pages (from-to)643-652
Number of pages10
JournalAdsorption
Volume19
Issue number2-4
DOIs
Publication statusPublished - Apr 2013
Externally publishedYes

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