Hydrogen releasing reaction between Mg(NH2)2 and CaH2

Improvement of Hydrogen Storage Properties of the Li–Mg–N–H System by Addition of LiBH4

“…1 A variety of metal amide-hydride combinations have been investigated for their hydrogen sorption performances. [2][3][4][5] Investigations expand beyond the binary metal hydrides to metal complex hydrides. 6,7 Among the studied systems, the Li-Mg-N-H system comprised of LiH and Mg(NH 2 ) 2 exhibits moderate operation temperatures, good reversibility, and a relatively high capacity of 5.6 wt % and is therefore regarded as a promising candidate for on-board application.…”

Ca–Na–N–H system for reversible hydrogen storage

“…However, before fuel cell car can truly run on the road there is a big problem to be solved-highly efficient onboard hydrogen storage system [1]. So far several new systems, such as carbonaceous materials [2,3], alanates [4,5], B-N-H complex [6] and metal-N-H [7][8][9][10][11][12][13][14][15][16][17] have been developed and actively investigated worldwide. As the first studied metal-N-H system, Li-N-H system [7] was proposed for hydrogen storage on the basis of the discovery of hydriding Li 3 N. Approximately 6.5 wt% of hydrogen can be reversibly stored at temperatures above 250 • C through the chemical reaction of Li 2 NH + H 2 ⇔ LiNH 2 + LiH.…”

“…Though this system was not suitable for practical hydrogen storage due to the unfavorable thermodynamics it brought an idea on hydrogen release from the mixtures of amide and hydride. Recently, new metal-N-H systems starting from LiNH 2 -MgH 2 [10,11], LiNH 2 -CaH 2 [10], Mg(NH 2 ) 2 -LiH [12,13], Mg(NH 2 ) 2 -NaH [14], Mg(NH 2 ) 2 -CaH 2 [15]and Ca(NH 2 ) 2 -CaH 2 [16] have been explored and evaluated for hydrogen storage. All those amide-hydride mixtures showed hydrogen release upon heating to certain temperatures.…”

Thermodynamics study of hydrogen storage materials

“…For example, Mg(NH 2 ) 2 /LiH (NaH, CaH 2 ) has a reversible hydrogen capacity of 5.6 wt% and a low hydrogen desorption temperature 90°C [70][71][72]. Actually, the dehydrogenation reaction is a two-step process that can be described as follows {equations (10) and (11)}:…”