NaBH4 formation mechanism by reaction of sodium borate with Mg and H2

Kinetic characteristics of sodium borohydride formation when sodium meta-borate reacts with magnesium and hydrogen

“…It suggests that the Fe, Co, Ni addition may not alter the reaction route or mechanisms. It is most likely that these transition metals facilitated hydrogen dissociation, which is believed as a necessary step for the synthesis reaction [4]. It is known that MgO formed on Mg particle surface is a barrier for hydrogen dissociation [10].…”

“…However, our latest results showed that NaBH 4 formation temperature initiated between 360 and 400 C [4]. Therefore, it is important to study kinetic characteristics of NaBH 4 synthesis from NaBO 2 , Mg and H 2 to find out the controlling factors.…”

“…However, there were only few publications related to borohydride synthesis from the spent fuel. It was reported that sodium borohydride could be formed by reaction of NaBO 2 with Mg and hydrogen (or MgH 2 ) through following reaction at around 450 C [1][2][3][4][5]:…”

Low-Cost Precursors to Novel Hydrogen Storage Materials

“…[40] Conversion improves with increasing temperature or with excess MgH 2 . NaBO 2 reduction using Al and H 2 has also been demonstrated but at lower yields, [41,42] although 70% yield has been achieved when Na 2 O is fed with Al to produce NaAlO 2 .…”

“…The typically low observed yields are in contrast to those reported in comparable reaction systems where yields are significantly higher. [40,43] Due to the lower yields in these screening studies of the one-step approach, the two-step approach of metal-hydride synthesis followed by hydride transfer (Eqs. 3.4-2, 3.4-3) was utilized for further development work.…”