Effect of NaH/MgB_2 ratio on the hydrogen absorption kinetics of the system NaH + MgB_2

摘要

In this work the effect of the ratio of starting reactants on the hydrogen absorption reaction of the system xNaH + MgB_2 is investigated. At a constant hydrogen pressure of 50 bar, depending on the amount of NaH present in the system NaH + MgB_2, different hydrogen absorption behaviors are observed. For two system compositions: NaH + MgB_2 and 0.5NaH + MgB_2, the formation of NaBH_4 and MgH_2 as only crystalline hydrogenation products is achieved. The relation between the ratio of the starting reactants and the obtained hydrogenation products is discussed in detail.