(US4431561-A)      Hydrogen storage material includes a solid lightweight element forming a host matrix and which incorporates a structurally modifying element promoting disorder to enhance the storage characteristics. Pref. the host element is Mg, Ca, Si, Al, B, or C and the modifying element in Fe, Cu, Mo, or Ni. Also claimed as a modifying element is Al, C, or O.    In the claimed method of making the storage material, the light-weight element pref. increase the density of H storage sites and the desorption temp. is lowered by incorporating a rare earth or transition modifier element to provide a spectrum of bonding energy. A high storage capacity is achieved. (8pp)e    (DE3314421-C)      Hydrogen is reversibly stored using as storage material (A) a known multicomponent alloy of (a) at least 1 light element having an atomic number up to 22 and (b) a modification element and having H storage sites with (B) the alloy forming a random arrangement of several phases and having a higher density at catalytically active sites.    (Aa) is pref. Mg, Ca, Si, Al, B and/or C and (Ab) is Fe, Cu, Mo and/or Ni. The phases can be semicrystalline, crystalline and/or amorphous. The storage material esp consists of Mg.C and O.    ADVANTAGE -   The storage material can be readily activated and has a high storage capacity for H.    (NL193591-B)      Multicomponent material of disordered compsn. for the reversible storage of H2 consists of a matrix of light element(s) (I) contg. modifying element(s) (II) which produce the disordered state to improve the H2 storage properties.    Pref. (II) can be another light element which increases the density of the storage sites for H atoms by interaction with H atoms or a transition or rare earth metal which increases the density of the catalytic sites for the dissociation of H2 into H atoms. The material is polycrystalline, microcrystalline and/or amorphous. Pref. (I) is Mg, Ca, Si, Al, B or C and (II) Fe, Cu, Mo, Ni, Al, C or O.    The material is useful for storing H2 during transport or for use as fuel for vehicles, machines, plants and fuel cells. It is suitable for large scale applications, having a greater H2 storage capacity than crystalline monophase matrices, satisfactory absorption and desorption properties and resistance to poisoning.