Direct synthesis of calcium borohydride
| DWPI Title: Producing complex borohydride e.g. calcium borohydride involves mixing alkaline earth metal hydride with alkaline earth metal boride and metal chloride catalyst powder and hydrogenating the mixture at elevated temperature and pressure |
| 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 TiCl3 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 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. |
| Use: For producing complex borohydride compound such as alkaline earth metal borohydride (claimed) particularly calcium borohydride which can be used as reversible hydrogen storage material for on-board storage using commercially available high-pressure tank (70 MPa). |
| Advantage: 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. |
| Novelty: Producing complex borohydride compound capable of reversible hydrogenation involves mechanically mixing alkaline earth metal hydride with alkaline earth metal boride powder and powder of metal chloride catalyst compound to provide a mixture, where the metal chloride catalyst comprises combined weight of the alkaline earth metal hydride and the alkaline earth metal boride (4-8 wt.%); and hydrogenating the mixture at an elevated temperature and pressure to provide alkaline earth metal borohydride compound. |
| Filed: 5/24/2007 |
| Application Number: US2007807012A |
| Tech ID: SD 10605.1 |
| 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. |
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