Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1279679 | International Journal of Hydrogen Energy | 2007 | 6 Pages |
Abstract
Hydrogen generating reaction between sodium borohydride, NaBH4, and magnesium hydroxide, Mg(OH)2 (brucite), was studied. Reaction rate was found to depend on the degree of reactants homogenization and/or their particle size. Kinetic of the reaction was studied in isothermal approach in the temperature range of 240–360 °C. It is shown that the reaction obeys 2D diffusion mechanism and its activation energy is 155.9 kJ/mol. Powder XRD analysis and Raman spectroscopy reveal that mechanically activated mixture of NaBH4 and Mg(OH)2 reacts yielding MgO as the only crystalline phase in the temperature range of 240–318 °C. At higher temperatures a new crystalline tetragonal phase of as yet undetermined composition is developed.
Keywords
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Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Vadym Drozd, Surendra Saxena, Subrahmanyam V. Garimella, Andriy Durygin,