Hydrogen Generation from Al-NiCl₂/NaBH₄Mixture Affected by Lanthanum Metal

Abstract

The effect of La on Al/NaBH4 hydrolysis was elaborated in the present paper. Hydrogen generation amount increases but hydrogen generation rate decreases with La content increasing. There is an optimized composition that Al-15 wt% La-5 wt% NiCl2/NaBH4 mixture (Al-15 wt% La-5 wt% NiCl2/NaBH4 weight ratio, 1 : 3) has 126 mL g−1 min−1 maximum hydrogen generation rate and 1764 mL g−1 hydrogen generation amount within 60 min. The efficiency is 88%. Combined with NiCl2, La has great effect on NaBH4 hydrolysis but has little effect on Al hydrolysis. Increasing La content is helpful to decrease the particle size of Al-La-NiCl2 in the milling process, which induces that the hydrolysis byproduct Ni2B is highly distributed into Al(OH)3 and the catalytic reactivity of Ni2B/Al(OH)3 is increased therefore. But hydrolysis byproduct La(OH)3 deposits on Al surface and leads to some side effect. The Al-La-NiCl2/NaBH4 mixture has good stability in low temperature and its hydrolytic performance can be improved with increasing global temperature. Therefore, the mixture has good safety and can be applied as on board hydrogen generation material.

Base-Metal Nanoparticle-Catalyzed Hydrogen Release from Ammine Yttrium and Lanthanum Borohydrides

“…In addition to some of the first row transition metal borohydrides, of relevance to this work yttrium borohydride, Y­(BH 4 ) 3 (9.1 wt % hydrogen) is reported to undergo H 2 release starting at ca. 185 °C, with 7.8 wt % H 2 production up to 500 °C. − While lanthanum metal has also been used to dope other MBH systems to release hydrogen under more favorable conditions, , La­(BH 4 ) 3 (6.5 wt % hydrogen) ,− is reported to release 2.9 wt % hydrogen with no diborane from LaCl 3 ·LiBH 4 (1:3) between 200 and 400 °C …”