The redox of iron oxide, 3Fe + 4H2O <=> Fe3O4 + 4 H2, can be applied as a new method of the storage and supply of hydrogen for SPFC vehicles. Among the additives to iron oxide tested, Al, Cr, Zr, Ga and V were the effective elements enhancing both the reduction of Fe3O4 with H2 (storage of H2) and reoxidation of the reduced iron oxide with water (recovery of H2) at low temperatures (< 400 deg C). The additives moderated the sintering of iron oxide markedly. It is suggested that another important role of additives is to activate H2 and H2O on the surface of iron oxide or to enhance the diffusion of O(2-) as a result of the formation of compound oxides between the additive and iron oxide.
Storage and generation of pure hydrogen by utilization of modified iron oxides
2002
10 Seiten, 4 Bilder, 1 Tabelle, 3 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Chemical storage of hydrogen by modified iron oxides
Online Contents | 2003
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