探析镁与碱性盐溶液反应的复杂性与可行性——以镁与碳酸钠溶液反应为例

Complexity and Feasibility of Reaction of Magnesium and Alkaline Salt Solutions:Reaction of Magnesium and Sodium Carbonate Solution

一次验证镁与NaHCO3溶液反应得到H2的实验中,发现镁能与饱和Na2CO3溶液作用持续释出H2,为此通过分析Mg/H2O体系的热力学数据和研究其动力学机理认为实现镁与水溶液作用能持续释出H2的有效方法:在溶液中加入能破坏氢氧化镁保护层的某些离子。并设计有关实验证明:在碱性溶液中,若加入能与Mg^2+形成稳定配合物的其他阴离子(如甘氨酸根离子、草酸根离子、EDTA等),则镁就能与碱性的盐溶液持续反应。

H2 gas was observed to emit continuously from the NaHCO3 solution and Mg, H2 also released continuously from saturated Na2CO3 solution and Mg. Therefore, this paper analyzed the thermodynamic data and the kinetic mechanism of the reaction of Mg and H2O, the results showed that H2 gas could continuously produce from the reaction of Mg and H2O by adding some organic ligands(such as glycine ion, oxalate ion, EDTA and etc) or chemicals(such as alkaline salt solution) which could destroy the protective layer of magnesium hydroxide.