Analysis of optimal conditions for adsorptive hydrogen storage in microporous solids

Nuno Bimbo, Valeska Ting, Jessica Sharpe, Tim Mays

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)113-119
JournalColloids and Surfaces, A: Physicochemical and Engineering Aspects
Volume437
Early online date19 Nov 2012
DOIs
Publication statusPublished - 20 Nov 2013

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Hydrogen storage
Hydrogen
Adsorbents
adsorbents
hydrogen
Containers
containers
Temperature
temperature
Activated carbon
porous materials
activated carbon
Isotherms
Porous materials
Sorption
sorption
Compaction
Gases
isotherms
engineering

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 journalArticle

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