Direct synthesis of calcium borohydride

Details Direct synthesis of calcium borohydride Direct synthesis of calcium borohydride

2007-05-24

2009-10-27

Mayes, Melvin C (Department: 1793)

Chemistry of inorganic compounds

Boron or compound thereof

Hydrogen and metal or ammonium containing

C423S644000, C423S645000, C423S646000, C423S648100, C423S658200

Reexamination Certificate

active

07608233

ABSTRACT:
A method is disclosed for directly preparing an alkaline earth metal borohydride, i.e. Ca(BH4)2, from the alkaline earth metal hydride and the alkaline earth metal boride. The borohydride thus prepared is doped with a small portion of a metal chloride catalyst compound, such as RuCl3, TiCl3, or a mixture of TiCl3and palladium metal. The process provides for mechanically mixing the dry reagents under an inert atmosphere followed by charging the mixed materials with high pressure hydrogen at about 70 MPa while heating the mixture to about 400° C. The method is relatively simple and inexpensive and provides reversible hydride compounds which are free of the usual contamination introduced by prior art wet chemical methods.

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