Hydrogen generation from Al/NaBH₄ hydrolysis promoted by Li¨CNiCl₂ additives

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• 作者：Mei-qiang  ; Fan  ; ;   ; ^{fanmeiqiang@126.com} ; Shu  ; Liu ; Wen-qiang  ; Sun ; Yong  ; Fei ; Hua  ; Pan ; Chun-Ju  ; Lv ; Da  ; Chen ; Kang-Ying  ; Shu  ; ;   ; ^{shukangying@163.com}
• 关键词：Hydrogen generation ; Al&ndash ; Li alloy ; Hydrolysis mechanism ; NaBH₄
• 刊名：International Journal of Hydrogen Energy
• 出版年：2011
• 出版时间：December 2011
• 年：2011
• 卷：36
• 期：24
• 页码：15673-15680
• 全文大小：1257 K

文摘

On-demand hydrogen generation from solid-state Al/NaBH₄ hydrolysis activated by Li¨CNiCl₂ additives are elaborated in the present paper. Hydrogen generation amount and rate can be regulated by changing Al/NaBH₄ weight ratio, Li and NiCl₂ amount, hydrolytic temperature, etc. The optimized Al?0?wt. % Li?5?wt. % NiCl₂/NaBH₄ mixture (weight ratio of 1:1) yields 1778?ml hydrogen/1?g mixture with 100 % efficiency within 50?min at 323?K. The improved hydrolytic performance comes from the effect of Li¨CNiCl₂ additives, which decrease aluminum particle size in the milling process and produce the catalytic promoter BNi₂/Al(OH)₃ in the hydrolytic process. Compared with the conventional reaction of Al and NaBH₄ in water, there is an interaction of Al/NaBH₄ hydrolysis which improves the hydrolytic kinetics of Al/NaBH₄ via the catalytic effect of hydrolysis by-products Al(OH)₃, BNi₂, and NaBO₂. The Al/NaBH₄ mixture may be applied as a portable hydrogen generation material. Our experimental data lay a foundation for designing practical hydrogen generators.