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Issue 20, 2008
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Ammonia for hydrogen storage: challenges and opportunities

Asbjørn Klerke,a  Claus Hviid Christensen,a  Jens K. Nørskovb  and  Tejs Vegge*c 
Author affiliations

* Corresponding authors

a Center for Sustainable and Green Chemistry, Department of Chemistry, Building 206, Technical University of Denmark, Kgs. Lyngby, Denmark

b Center for Atomic-scale Materials Design, Department of Physics, Building 310, Technical University of Denmark, Kgs. Lyngby, Denmark

c Materials Research Department, Risø National Laboratory for Sustainable Energy, Building 228, Technical University of Denmark, Roskilde, Denmark
E-mail: tejs.vegge@risoe.dk

Abstract

The possibility of using ammonia as a hydrogen carrier is discussed. Compared to other hydrogen storage materials, ammonia has the advantages of a high hydrogen density, a well-developed technology for synthesis and distribution, and easy catalytic decomposition. Compared to hydrocarbons and alcohols, it has the advantage that there is no CO2 emission at the end user. The drawbacks are mainly the toxicity of liquid ammonia and the problems related to trace amounts of ammonia in the hydrogen after decomposition. Storage of ammonia in metal ammine salts is discussed, and it is shown that this maintains the high volumetric hydrogen density while alleviating the problems of handling the ammonia. Some of the remaining challenges for research in ammonia as a hydrogen carrier are outlined.

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Publication details

The article was received on 02 Jan 2008, accepted on 13 Mar 2008 and first published on 03 Apr 2008


Article type: Feature Article
DOI: 10.1039/B720020J
Citation: J. Mater. Chem., 2008,18, 2304-2310
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    Ammonia for hydrogen storage: challenges and opportunities

    A. Klerke, C. H. Christensen, J. K. Nørskov and T. Vegge, J. Mater. Chem., 2008, 18, 2304
    DOI: 10.1039/B720020J

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