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Hydrogen Generation from Al-NiCl2/NaBH4 Mixture Affected by Lanthanum Metal

机译:镧对Al-NiCl2 / NaBH4混合气制氢的影响

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摘要

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.
机译:本文阐述了La对Al / NaBH4水解的影响。随着La含量的增加,氢的生成量增加,但是氢的生成率降低。有一个优化的成分,即Al-15 wt%La-5 wt%NiCl2 / NaBH4混合物(Al-15 wt%La-5 wt%NiCl2 / NaBH4重量比,1:3)具有126 mL g -1 min -1 的最大氢生成速率和60 min内的1764 mL g -1 氢生成量。效率为88%。 La与NiCl2结合,对NaBH4的水解作用很大,但对Al的水解作用很小。 La含量的增加有助于减小Al-La-NiCl2在研磨过程中的粒径,这导致水解副产物Ni2B高度分布在Al(OH)3中,并且Ni2B / Al(OH)3的催化反应性为因此增加。但是水解副产物La(OH)3沉积在Al表面并导致一些副作用。 Al-La-NiCl2 / NaBH4混合物在低温下具有良好的稳定性,并且随着全球温度的升高,其水解性能可以得到改善。因此,该混合物具有良好的安全性,并且可以用作船上制氢材料。

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