Facile hydrogen production from Al-water reaction promoted by choline hydroxide
Facile hydrogen production from Al-water reaction promoted by choline hydroxide
复制标题
氢氧化胆碱促进铝-水反应轻松产氢
DOI：
10.1016/j.energy.2017.05.031
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发表时间：
2017-07-15
期刊：
影响因子：
9
通讯作者：
Wang, Mingyong
中科院分区：
文献类型：
--
作者：
Wang, Hongqi;Wang, Zhi;Wang, Mingyong
利用氢氧化胆碱加速铝-水反应，高效稳定地制氢，仅需水和铝的消耗。考察了铝初始质量、碱浓度、反应温度等工艺参数对反应速率和产率的影响。与其他活化方法的平均值52.55kJ/mol相比，表观活化能为45.92kJ/mol，表明氢氧化胆碱对反应有明显的促进作用。机理分析表明，氢氧化胆碱的解离平衡(pK(B)=1.3)在反应初期限制了氢氧化胆碱的完全解离，在反应后期促进了OH-的再生。在相同条件下，与氢氧化钠(pK(B)=0.2)相比，氢氧化胆碱的腐蚀性较弱。用HSAB理论验证了氢氧化胆碱的解离平衡。氢氧化胆碱的平均产氢速率与氢氧化钠的平均产氢速率一样快。氢氧化胆碱产氢速率的标准偏差为78.7mL/m in，低于氢氧化钠的108.3 m L/m in，说明氢氧化胆碱的稳定性。因此，氢氧化胆碱的腐蚀性较弱，且能稳定补充OH-，因此应用氢氧化胆碱可以为燃料电池提供氢气。(C)2017爱思唯尔有限公司。保留所有权利。
Choline hydroxide was used to accelerate the Al-water reaction to produce hydrogen efficiently and steadily, with only water and aluminum consumption. The effects of parameters such as initial aluminum mass, alkali concentration and temperature on the reaction rate and yield were studied. Compared with the average value 52.55 kJ/mol of other activation methods, the apparent activation energy of 45.92 kJ/mol indicates that choline hydroxide can promote the reaction significantly. The mechanism analysis demonstrates that the dissociation equilibrium of choline hydroxide (pK(b) = 1.3) can restrict the complete dissociation in the initial reaction stage and accelerate the regeneration of OH- in the latter stage. Compared with the NaOH (pK(b) = 0.2) under the same condition, the choline hydroxide is less corrosive. The dissociation equilibrium of choline hydroxide was also verified by the HSAB theory. The average hydrogen generation rate activated by choline hydroxide is as fast as that of NaOH. The standard deviation of hydrogen generation rate of choline hydroxide is 78.7 mL/min, lower than that of NaOH being 108.3 mL/min, indicating the stability by choline hydroxide. Therefore, the application of choline hydroxide can produce hydrogen for fuel cells due to its weak corrosion and stable supplement of OH-. (C) 2017 Elsevier Ltd. All rights reserved.