Catalytic effect of monoclinic WO<sub>3</sub>, hexagonal WO<sub>3</sub> and H<sub>0.23</sub>WO<sub>3</sub> on the hydrogen sorption properties of Mg
Language
en
Article de revue
This item was published in
International Journal of Hydrogen Energy. 2009, vol. 34, n° 8, p. 3404-3409
Elsevier
English Abstract
The H sorption properties of mixtures Mg + WO<sub>3</sub> (having various structures) and Mg + H<sub>0.23</sub>WO<sub>3</sub> are reported. First, the higher conversion of Mg into MgH<sub>2</sub> during reactive mechanical ...Read more >
The H sorption properties of mixtures Mg + WO<sub>3</sub> (having various structures) and Mg + H<sub>0.23</sub>WO<sub>3</sub> are reported. First, the higher conversion of Mg into MgH<sub>2</sub> during reactive mechanical grinding (under 1.1 MPa of H<sub>2</sub>) for higher WO<sub>3</sub> content is due to the improvement of the milling efficiency. Then, it is shown that the hydrogen absorption properties are almost independent of the crystal structure of the catalyst and that only the particles' size and the specific surface play a major role. Finally, for the desorption process, it appears that the chemical composition and structure of the catalyst, together with the particle size and specific surface have an effect.Read less <
English Keywords
Hydrogen storage
Magnesium hydride
Kinetics
Mechanical alloying
Origin
Hal imported