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Direct synthesis of calcium borohydride

United States Patent

October 27, 2009
View the Complete Patent at the US Patent & Trademark Office
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A method is disclosed for directly preparing an alkaline earth metal borohydride, i.e. Ca(BH.sub.4).sub.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 RuCl.sub.3, TiCl.sub.3, or a mixture of TiCl.sub.3 and 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 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.
Ronnebro; Ewa Carin Ellinor (Dublin, CA), Majzoub; Eric H. (Pleasanton, CA)
Sandia Corporation (Livermore, CA)
11/ 807,012
May 24, 2007
STATEMENT OF GOVERNMENT INTEREST The United States Government has rights in this invention pursuant to Contract No. DE-AC04-94AL85000 between the United States Department of Energy and Sandia Corporation, for the operation of the Sandia National Laboratories.