(EP874781-A1)      Nanocrystalline composite for H2 storage comprises: (a) 70 - 95 wt. % of a first H2 carrier, or high temperature metal hydride of Mg, Mg2Ni or Be and Li alloys, with a high storage capacity, requiring high temperatures for absorption/desorption (I); and (b) 5 - 30 wt. % of a second H2 carrier, or low temperature metal hydride of FeTi, LaNi5, Nb, V, Na, Cs, Mn or Pd, with a high storage capacity, requiring low temperatures for absorption/desorption (II). (I) and (II) are in contact, in the form of nanocrystalline powders.    USE -   The composite is used especially as an H2 supply source for H2-fuelled vehicles.    ADVANTAGE -   combination of (I) and (II) allows multi-stage hydrogenation/dehydrogenation. (II) is effective to desorb H2 on cold startup, and (I) is then effective at higher operating temperatures. When the engine is switched off, desorption from (I) may continue, which is adsorbed by (II), ready for the next startup.    (US5906792-A)      Nanocrystalline composite for H2 storage comprises: (a) 70 - 95 wt. % of a first H2 carrier, or high temperature metal hydride of Mg, Mg2Ni or Be and Li alloys, with a high storage capacity, requiring high temperatures for absorption/desorption (I); and (b) 5 - 30 wt. % of a second H2 carrier, or low temperature metal hydride of FeTi, LaNi5, Nb, V, Na, Cs, Mn or Pd, with a high storage capacity, requiring low temperatures for absorption/desorption (II). (I) and (II) are in contact, in the form of nanocrystalline powders.    USE -   The composite is used especially as an H2 supply source for H2-fuelled vehicles.    ADVANTAGE -   combination of (I) and (II) allows multi-stage hydrogenation/dehydrogenation. (II) is effective to desorb H2 on cold startup, and (I) is then effective at higher operating temperatures. When the engine is switched off, desorption from (I) may continue, which is adsorbed by (II), ready for the next startup.    (JP2000503292-W)      Nanocrystalline composite for H2 storage comprises: (a) 70 - 95 wt. % of a first H2 carrier, or high temperature metal hydride of Mg, Mg2Ni or Be and Li alloys, with a high storage capacity, requiring high temperatures for absorption/desorption (I); and (b) 5 - 30 wt. % of a second H2 carrier, or low temperature metal hydride of FeTi, LaNi5, Nb, V, Na, Cs, Mn or Pd, with a high storage capacity, requiring low temperatures for absorption/desorption (II). (I) and (II) are in contact, in the form of nanocrystalline powders.    USE -   The composite is used especially as an H2 supply source for H2-fuelled vehicles.    ADVANTAGE -   combination of (I) and (II) allows multi-stage hydrogenation/dehydrogenation. (II) is effective to desorb H2 on cold startup, and (I) is then effective at higher operating temperatures. When the engine is switched off, desorption from (I) may continue, which is adsorbed by (II), ready for the next startup.    (EP874781-B1)      Nanocrystalline composite for H2 storage comprises: (a) 70 - 95 wt. % of a first H2 carrier, or high temperature metal hydride of Mg, Mg2Ni or Be and Li alloys, with a high storage capacity, requiring high temperatures for absorption/desorption (I); and (b) 5 - 30 wt. % of a second H2 carrier, or low temperature metal hydride of FeTi, LaNi5, Nb, V, Na, Cs, Mn or Pd, with a high storage capacity, requiring low temperatures for absorption/desorption (II). (I) and (II) are in contact, in the form of nanocrystalline powders.    USE -   The composite is used especially as an H2 supply source for H2-fuelled vehicles.    ADVANTAGE -   combination of (I) and (II) allows multi-stage hydrogenation/dehydrogenation. (II) is effective to desorb H2 on cold startup, and (I) is then effective at higher operating temperatures. When the engine is switched off, desorption from (I) may continue, which is adsorbed by (II), ready for the next startup.