Comparative studies of reaction rates of NH3 with MgH2 and LiH

The reaction rate of MgH₂ with NH₃ is studied using a two-layered structure containing a top MgH₂ layer and a bottom LiNH₂ layer. Quantification of the effluent gas composition from the two-layered structure indicates substantial NH₃ emission, while the X-ray diffraction analysis reveals little formation of the reaction products between MgH₂ and NH₃. In contrast, the study of the two-layered structure containing a top LiH layer and a bottom LiNH₂ layer reveals that the reaction between LiH and NH₃ is much faster than that between MgH₂ and NH₃.