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

Sharpe, Jessica E. and Bimbo, Nuno and Ting, Valeska P. and Burrows, Andrew D. and Jiang, Dongmei and Mays, Timothy J. (2013) Supercritical hydrogen adsorption in nanostructured solids with hydrogen density variation in pores. Adsorption-Journal of the International Adsorption Society, 19 (2). pp. 643-652. ISSN 0929-5607

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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 TIOEth 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.

Item Type:
Journal Article
Journal or Publication Title:
Adsorption-Journal of the International Adsorption Society
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3110
Subjects:
ID Code:
75842
Deposited By:
Deposited On:
21 Oct 2015 05:00
Refereed?:
Yes
Published?:
Published
Last Modified:
23 Sep 2020 02:22