Synthesis and decomposition reactions of metal amides in metal-N-H hydrogen storage system


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After some metal amides M(NH2)x such as LiNH2, NaNH2, Mg(NH2)2 and Ca(NH2)2 were synthesized by ball milling the corresponding metal hydrides MHx under ammonia atmosphere at room temperature, their thermal decomposition properties were examined, which play important roles for designing a new family of novel Metal-N-H systems. The results indicate that the kinetics of their synthesizing reactions are faster in the order of Na amide > Li amide > Ca amide > Mg amide, while both Mg(NH2)2 and Ca(NH2)2 decompose and emit NH3 at lower temperature than LiNH2.



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