Abstract
| Language | English |
|---|---|
| Pages | 113-119 |
| Journal | Colloids and Surfaces, A: Physicochemical and Engineering Aspects |
| Volume | 437 |
| Early online date | 19 Nov 2012 |
| DOIs | |
| Status | Published - 20 Nov 2013 |
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Keywords
- hydrogen storage
- Porous materials (adsorbents
- Adsorption
- Compressed hydrogen systems
Cite this
Analysis of optimal conditions for adsorptive hydrogen storage in microporous solids. / Bimbo, Nuno; Ting, Valeska; Sharpe, Jessica; Mays, Tim.
In: Colloids and Surfaces, A: Physicochemical and Engineering Aspects, Vol. 437, 20.11.2013, p. 113-119.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Analysis of optimal conditions for adsorptive hydrogen storage in microporous solids
AU - Bimbo, Nuno
AU - Ting, Valeska
AU - Sharpe, Jessica
AU - Mays, Tim
PY - 2013/11/20
Y1 - 2013/11/20
N2 - There is much current interest in the storage of hydrogen in porous materials for mobile energy applications. Despite significant hydrogen storage capacities having been observed recently for some synthesised materials, the identification of optimal operating conditions (pressure and temperature) is perhaps an even more important consideration from an engineering and applied science perspective. There will be pressure and temperature limits for effective use of an adsorptive storage system, because the adsorbent will always displace a volume in the storage container, and so at very high pressures the amount of hydrogen stored at a given temperature will be greater for a container with no adsorbent. In order for an adsorbent to be used there has to be some gain in the amount of the hydrogen stored to compensate for the cost and mass of the solid. We present a methodology by which the pressure and temperature ranges where it is advantageous to use adsorptive storage can be easily identified and the real gain of using such systems in terms of the absolute amount of hydrogen stored can be quantified. Using a well-characterised commercial activated carbon as an example system, we modelled high pressure hydrogen sorption isotherms and identified the operating conditions for which there is a significant increase in storage capacity from using an adsorbent as opposed to storage in the same volume via compression of hydrogen at the same temperature. A novel comparison of the density enhancement in the micropores with respect to the bulk hydrogen gas, as well as the influence of incorporating different amounts of adsorbent into a high pressure storage container is also presented.
AB - There is much current interest in the storage of hydrogen in porous materials for mobile energy applications. Despite significant hydrogen storage capacities having been observed recently for some synthesised materials, the identification of optimal operating conditions (pressure and temperature) is perhaps an even more important consideration from an engineering and applied science perspective. There will be pressure and temperature limits for effective use of an adsorptive storage system, because the adsorbent will always displace a volume in the storage container, and so at very high pressures the amount of hydrogen stored at a given temperature will be greater for a container with no adsorbent. In order for an adsorbent to be used there has to be some gain in the amount of the hydrogen stored to compensate for the cost and mass of the solid. We present a methodology by which the pressure and temperature ranges where it is advantageous to use adsorptive storage can be easily identified and the real gain of using such systems in terms of the absolute amount of hydrogen stored can be quantified. Using a well-characterised commercial activated carbon as an example system, we modelled high pressure hydrogen sorption isotherms and identified the operating conditions for which there is a significant increase in storage capacity from using an adsorbent as opposed to storage in the same volume via compression of hydrogen at the same temperature. A novel comparison of the density enhancement in the micropores with respect to the bulk hydrogen gas, as well as the influence of incorporating different amounts of adsorbent into a high pressure storage container is also presented.
KW - hydrogen storage
KW - Porous materials (adsorbents
KW - Adsorption
KW - Compressed hydrogen systems
UR - http://www.scopus.com/inward/record.url?scp=84871527845&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1016/j.colsurfa.2012.11.008
U2 - 10.1016/j.colsurfa.2012.11.008
DO - 10.1016/j.colsurfa.2012.11.008
M3 - Article
VL - 437
SP - 113
EP - 119
JO - Colloids and Surfaces, A: Physicochemical and Engineering Aspects
T2 - Colloids and Surfaces, A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces, A: Physicochemical and Engineering Aspects
SN - 0927-7757
ER -