Selective and mild hydrogen production using water and formaldehyde
Selective and mild hydrogen production using water and formaldehyde
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DOI：
10.1038/ncomms4621
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发表时间：
2014-04-01
影响因子：
16.6
通讯作者：
Prechtl, Martin H. G.
中科院分区：
文献类型：
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作者：
Heim, Leo E.;Schloerer, Nils E.;Prechtl, Martin H. G.
随着在寻找用于移动的和固定应用的新的能量存储系统方面的努力的增加，深入研究的燃料分子是二氢，这是由于其能量含量以及将其以质子氢和质子氢的形式存储在例如液体有机氢载体中的可能性。在这里，我们表明，在多聚甲醛或甲醛存在下的水适合于分子储氢，因为这些分子形成稳定的甲烷，甲烷可以容易地和选择性地脱氢形成氢气和二氧化碳。在该系统中，两种分子都是氢源，假设一当量的水和一当量的甲醛，产生8.4%的理论重量效率。因此，它可能高于甲酸（4.4重量%），因为即使当使用工业甲醛水溶液（37重量%）时，稀释的甲烷水溶液也具有5.0重量%的效率。在空气存在下，使用钌催化剂，在低温下可以有效地产生氢。
With the increased efforts in finding new energy storage systems for mobile and stationary applications, an intensively studied fuel molecule is dihydrogen owing to its energy content, and the possibility to store it in the form of hydridic and protic hydrogen, for example, in liquid organic hydrogen carriers. Here we show that water in the presence of paraformaldehyde or formaldehyde is suitable for molecular hydrogen storage, as these molecules form stable methanediol, which can be easily and selectively dehydrogenated forming hydrogen and carbon dioxide. In this system, both molecules are hydrogen sources, yielding a theoretical weight efficiency of 8.4% assuming one equivalent of water and one equivalent of formaldehyde. Thus it is potentially higher than formic acid (4.4 wt%), as even when technical aqueous formaldehyde (37 wt%) is used, the diluted methanediol solution has an efficiency of 5.0 wt%. The hydrogen can be efficiently generated in the presence of air using a ruthenium catalyst at low temperature.