Department of Chemistry, University of Cologne, Greinstrasse 6, 50939 Koeln, Germany.
Nat Commun. 2014 Apr 8;5:3621. doi: 10.1038/ncomms4621.
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.
随着人们在寻找用于移动和固定应用的新能源存储系统方面的努力不断增加，由于其能量含量，氢气作为一种受到广泛研究的燃料分子，有可能以储氢和质子氢的形式储存，例如储存在液体有机氢载体中。在这里，我们表明水在多聚甲醛或甲醛的存在下适合于储氢，因为这些分子形成稳定的甲二醇，其可以容易地和选择性地脱氢形成氢气和二氧化碳。在这个系统中，这两种分子都是氢源，假设水和甲醛各为一当量，则理论重量效率为 8.4%。因此，它比甲酸（4.4wt%）更有潜力，因为即使使用技术上的水溶液甲醛（37wt%），稀释的甲二醇溶液的效率也为 5.0wt%。在空气存在下，使用钌催化剂可以在低温下有效地产生氢气。
