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

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

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.

Hydrogen adsorption, Isotherm equations, Porous solids
0929-5607
643-652
Sharpe, Jessica E.
c8f4c69d-b116-49d1-ab40-71a5807b6a59
Bimbo, Nuno
53d9fc24-e2c1-4e2d-8d75-8dc640d8adda
Ting, Valeska P.
d4381878-2aad-4a3f-a7cc-021a7f7075eb
Burrows, Andrew D.
5f2fd900-fa83-4de6-93e0-bf1a434effc8
Jiang, Dongmei
e3a1d6f0-a400-4573-ac4c-1b808bc9447f
Mays, Timothy J.
d02351c7-1d8f-4a9e-8d16-675c1f7b3635
Sharpe, Jessica E.
c8f4c69d-b116-49d1-ab40-71a5807b6a59
Bimbo, Nuno
53d9fc24-e2c1-4e2d-8d75-8dc640d8adda
Ting, Valeska P.
d4381878-2aad-4a3f-a7cc-021a7f7075eb
Burrows, Andrew D.
5f2fd900-fa83-4de6-93e0-bf1a434effc8
Jiang, Dongmei
e3a1d6f0-a400-4573-ac4c-1b808bc9447f
Mays, Timothy J.
d02351c7-1d8f-4a9e-8d16-675c1f7b3635

Sharpe, Jessica E., Bimbo, Nuno, Ting, Valeska P., Burrows, Andrew D., Jiang, Dongmei and Mays, Timothy J. (2013) Supercritical hydrogen adsorption in nanostructured solids with hydrogen density variation in pores. Adsorption, 19 (2-4), 643-652. (doi:10.1007/s10450-013-9487-6).

Record type: Article

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.

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More information

Accepted/In Press date: 24 January 2013
e-pub ahead of print date: 22 February 2013
Published date: April 2013
Keywords: Hydrogen adsorption, Isotherm equations, Porous solids

Identifiers

Local EPrints ID: 435202
URI: https://eprints.soton.ac.uk/id/eprint/435202
ISSN: 0929-5607
PURE UUID: 4ee17656-fe13-4438-b627-5ded979fbd4a

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Date deposited: 25 Oct 2019 16:30
Last modified: 25 Oct 2019 16:30

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Contributors

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

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