Formation mechanism of Sr2AlH7

Hydrogen storage: beyond conventional methods

“…A stablecycle with a capacity between 3 and 4 wt% was described by Morioka et al, who concluded that rehydrogenation of potassium aluminium hydride takes place at 10 bar between 250 and 330 1C in the absence of a catalyst. 181 The dehydrogenation and rehydrogenation process of several other metal alanates have also been studied, 120 including Mg(AlH 4 ) 2 , 182 Ca(AlH 4 ) 2 , 183 Sr 2 AlH 7 , [184][185][186] BaAlH 5 , 187 and the mixed species Na 2 LiAlH 6 , 188 K 2 LiAlH 6 , 189 and LiMg(AlH 4 ) 3 . 190…”

Synthesis of the (Sr,Ca)2AlH7 hydride

“…However, there were two types of (Sr,Ca)H 2 existed in the milled product. One was produced from the hydrogen-induced phase decomposition of (Sr,Ca) 8 Al 7 , in which Al particles with small size dispersed homogenously [13]. The other was formed from the hydrogenation of (Sr,Ca), in which there was no Al particle dispersed.…”

Alanates, a Comprehensive Review

“…On the other hand, Sr 2 AlH 7 decomposes to SrH 2 , Al, and H 2 at 290 °C [231,232]. However, attempts to hydrogenate mixtures of 4SrH 2 + 2Al (70 bar, 260 °C, two days) did not succeed.…”