Hydrogen generation by hydrolysis of Al–Li–Bi–NaCl mixture with pure water
Hydrogen generation by hydrolysis of Al–Li–Bi–NaCl mixture with pure water
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DOI：
10.1016/j.ijhydene.2011.03.029
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发表时间：
2012
影响因子：
7.2
通讯作者：
Shu Liu;M. Fan;Chao Wang;Yuexiang Huang;Da Chen;Liqun Bai;Kang-ying Shu
中科院分区：
文献类型：
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作者：
Shu Liu;M. Fan;Chao Wang;Yuexiang Huang;Da Chen;Liqun Bai;Kang-ying Shu
以NaCl为助磨剂，采用球磨工艺制备了Al-Bi-Li混合物，并对制备的混合物在纯水中的析氢性能进行了评价。结果表明，Li的加入能显著提高铝基混合物的水解速率，增加其产氢量。当Li的量增加到4wt%时，1g Al基混合物可以产生1.38SL的氢气，这高于由纯Al和水产生的氢气。粉末X射线衍射分析表明，球磨过程中形成了BiLi 3和AlLi等新相。铝基混合物的水解速率的提高主要归因于这些新相的存在，因为它们可能在水中充当活性反应中心。从析氢动力学数据计算的表观活化能也支持了这种解释。Al基混合物的水解产物为Al（OH）3（三羟铝石）、Bi和LiAl 2（OH）7·2 H2O，而未添加Li的体系仅观察到AlOOH（勃姆石），表明Li的添加确实增加了水解过程中的羟基离子浓度。
In the present work, the Al–Bi–Li mixtures were prepared by a milling processing, using NaCl as the milling-assisted agent, and the hydrogen evolution characteristics of the as-prepared Al-based mixtures with pure water were evaluated. The results showed that the addition of Li could significantly improve the hydrolysis rate of Al-based mixtures and increase the amount of generated hydrogen. When the amount of Li was increased up to 4 wt%, 1 g Al-based mixture could yield 1.38 SL hydrogen which was higher than that generated from pure Al and water. The powder X-ray diffraction analysis indicated that some new phases, namely BiLi3and AlLi, were formed during the milling process. The enhanced hydrolysis rate of Al-based mixtures was mostly attributed to the presence of these new phases because they might act as an active reaction center in water. The apparent activation energy calculated from the as-obtained hydrogen evolution kinetic data also supported such an explanation. The hydrolysis products of Al-based mixtures were Al(OH)3(bayerite), Bi and LiAl2(OH)7·2H2O, whereas only AlOOH (boehmite) was observed for the system without addition of Li, indicating that the addition of Li did increase the hydroxyl ions concentration during the hydrolysis process.