Hydrogen Storage Using Ionic Liquid Media

Prechtl, Martin H. G.; Sahler, Sebastian

doi:10.2174/1385272811317030004

Cited by 20 publications

(15 citation statements)

References 66 publications

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“…Indeed, the time-resolved MS analysis confirms that in the initial period the composition contains much larger amounts of hydrogen rather than carbon dioxide (Supplementary Figs 3,4a). It should be pointed out that neither FA nor CO is present in significant amounts in the gaseous phase as confirmed by labelling experiments with 13 C-pFA and H 2 18 O, which underlines the robustness (no FA extrusion) and the selective dehydrogenation as no relevant CO formation is observed (Supplementary Figs 3,4a,b; Fig. 2).…”

Section: Resultsmentioning

confidence: 61%

“…In addition, through-space couplings were detected by way of 2D H,H nuclear overhauser effect spectroscopy experiments: cross peaks revealed interactions between p-cymene ligand and hydride, as well as proximity between p-cymene and formiate ( Supplementary Figs 6-24; Supplementary Table 2). Besides the compound described above, other Ru complexes were also visible in the 1 H NMR spectrum: besides traces of [(Ru(p-cymene)) 2 (mCl) 2 Cl 2 ] 1 and its hydrolysis products, for example, [(Ru(pcymene)) 2 (m-OH) 3 ] þ 2, at least one other Ru(p-cymene) complex could be identified. These three additional species are in chemical exchange, as evidenced by H,H EXchange SpectroscopY experiments, most likely exchange between chlorido and hydroxo ligands (vide infra) 37,40 .…”

Section: Resultsmentioning

confidence: 90%

“…The lowtemperature reforming of pFA and FA in aqueous solution is catalysed by the commercially available [(Ru(p-cymene)) 2 (m-Cl) 2 Cl 2 ] 1 as the catalyst precursor, which was previously investigated in-depth for the decomposition of formic acid 8 . Contrary to the formic acid decomposition, no catalyst preactivation with base is needed for the pFA/FA decomposition.…”

Section: Resultsmentioning

confidence: 99%

“…One promising solution involves hydrogen as an alternative energy carrier and feedstock for environmental and economic reasons. In particular, hydrogen storage is of great interest in combination with direct hydrogen fuel cells as efficient energy conversion systems [1][2][3] . The competitiveness of hydrogen and its superior energetic properties (123 MJ kg À 1 ) in comparison with fossil fuels (diesel: 46 MJ kg À 1 ) is still restricted owing to delivery problems.…”

mentioning

confidence: 99%

“…Examples are metal hydrides [4][5][6] , ammonia borane derivatives 2,3,7 , formic acid 2,[8][9][10][11][12][13][14][15][16][17] and methanol [18][19][20][21] . Ammonia borane derivatives have a good weight efficiency (r19.4 wt% H 2 ) 2,3,7 , but the solid spentfuels are hardly recyclable. Formic acid-based systems are robust 8,15,16 , but the H 2 weight efficiency is quite low (4.4 wt% H 2 ), and so far low-temperature methanol-based systems (12.5 wt% H 2 ) 18 are limited to inert conditions, as the nature of the catalysts is sensitive to air and might decompose under oxidative conditions.…”

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confidence: 99%

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Selective and mild hydrogen production using water and formaldehyde

et al. 2014

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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.

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Selective and mild hydrogen production using water and formaldehyde

et al. 2014

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Rechargeable Hydrogen Storage System Based on the Dehydrogenative Coupling of Ethylenediamine with Ethanol

Ben‐David

Milstein

2015

Angewandte Chemie

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An ovel and simple hydrogen storage system was developed, based on the dehydrogenative coupling of inexpensive ethylenediamine with ethanol to form diacetylethylenediamine.T he system is rechargeable and utilizes the same ruthenium pincer catalyst for both hydrogen loading and unloading procedures.I ti se fficient and uses al ow catalyst loading. Repetitive reversal reactions without addition of new catalyst result in excellent conversions in both the dehydrogenation and hydrogenation procedures in three cycles.The search for sustainable energy systems to replace the current fossil-fuel-based technologies is an urgent issue. [1, 2] Construction of as ustainable energy supply chain requires energy generation, storage,a nd release.H ence the development of efficient and inexpensive energy storage and liberation systems is needed. Through such systems,e nergy can be stored during "energy-rich" periods and used during "energy-lean" periods.H ydrogen, which holds the highest energy density by weight, is viewed as an ideal candidate for the future energy supply.

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