Direct synthesis of magnesium borohydride

DWPI Title: Production of magnesium borohydride useful for making hydrogen storage material involves hydrogenating quantity of magnesium boride at elevated temperature and pressure to provide quantity of magnesium borohydride
Abstract: A method is disclosed for directly preparing an alkaline earth metal borohydride, i.e. Mg(BH4)2, from the alkaline earth metal boride MgB2 by hydrogenating the MgB2 at an elevated temperature and pressure. The boride may also be doped with small amounts of a metal chloride catalyst such as TiCl3 and/or NiCl2. The process provides for charging MgB2 with high pressure hydrogen above at least 70 MPa while simultaneously heating the material to about 350° C. to about 400° C. The method is relatively simple and inexpensive and provides a reversible hydride compound having a hydrogen capacity of at least 11 wt %.
Use: In the production of magnesium borohydride for making hydrogen storage material (claimed).
Advantage: The method is relatively simple and inexpensive; provides a high-capacity reversible hydrogen storage system; and provides a reversible hydride compound having a hydrogen capacity of at least 11 wt.%.
Novelty: Producing (M1) a magnesium borohydride (Mg(BH 4 ) 2 ), involves hydrogenating a quantity of magnesium boride (MgB 2 ) at an elevated temperature and pressure to provide a quantity of Mg(BH 4 ) 2 , where the hydrogenation is performed at a temperature of ≥ 350° C, and at a hydrogen pressure of at least 70 MPa.
Filed: 9/3/2009
Application Number: US2009553633A
Tech ID: SD 11084.1
This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention.
Data from Derwent World Patents Index, provided by Clarivate
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