Some metallic alloys absorb gaseous hydrogen reversibly at reasonable temperatures and pressures. Hydride formation is exothermic, and recovery of hydrogen from the hydride therefore requires heat. For a typical metal hydride system, the alloy absorbs hydrogen until equilibrium is attained between a saturated metallic phase and gaseous hydrogen. Addition of further hydrogen causes formation of a metal hydride phase until all metal has been consumed. The isotherm has a typical absorption plateau. The heat evolved during hydride formation must be removed. The energy content of a hydride is 600-2400 kwh/kg, against 30 kwh/kg for a lead-acid battery. Gaseous hydrogen can be stored in cylinders containing metal hydride more safely and at A lower filling pressure, producing purer gas. The cylinders can be filled from an electrolysis plant without compressors. A "compressor" for hydrogen using a metal hydride is being developed. Use of gaseous hydrogen as fuel is brought much nearer by storage in metal hydrides. Conventional engines need only minor modifications for use with hydrogen or hydrogen/petrol mixture. Certain metal hydrides absorb hydrogen more easily than deuterium. Development on this goes on. By using different metal hydrides with different absorption temperatures, a heat pump system can be constructed. (TRRL)

  • Availability:
  • Corporate Authors:


    Box 104
    Halmstad,   Sweden 
  • Authors:
    • Noreus, D
  • Publication Date: 1980


  • Swedish

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 24-26
  • Serial:
    • Energimagasinet
    • Issue Number: 3
    • Publisher: Teknikfoerlaget
    • ISSN: 0348-9493

Subject/Index Terms

Filing Info

  • Accession Number: 00331175
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1981 12:00AM