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

Jessica Sharpe, Nuno Bimbo, Valeska Ting, Andrew Burrows, Dongmei Jiang, Tim Mays

Research output: Contribution to journalArticle

17 Citations (Scopus)
217 Downloads (Pure)

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 Unilanb 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 Toth 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 pages11
JournalAdsorption
Volume19
Issue number2-4
Early online date24 Jan 2013
DOIs
Publication statusPublished - Apr 2013

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