Hydrolysis of Mg(BH4)2 and its coordination compounds as a way to obtain hydrogen
| Autor: | Oleg V. Chashchikhin, A. S. Zyubin, M. V. Solov’ev, Alexey A. Zaytsev, Tatyana S. Zyubina, Victor N. Khrustalev, O. V. Kravchenko, Yu. A. Dobrovolsky, Pavel V. Dorovatovskii |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Denticity Hydrogen Renewable Energy Sustainability and the Environment Ligand Inorganic chemistry Energy Engineering and Power Technology chemistry.chemical_element Diglyme 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Coordination complex chemistry.chemical_compound Hydrolysis Hydrogen storage chemistry Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology Diborane |
| Zdroj: | Journal of Power Sources. 377:93-102 |
| ISSN: | 0378-7753 |
| Popis: | Three ligand-stabilized Mg(BH4)2–based complexes have been synthesized and evaluated as potential hydrogen storage media for portable fuel cell applications. The new borohydrides: Mg(BH4)2 × 0.5Et2O and Mg(BH4)2 × diglyme (diglyme – CH3O(CH2)2O(CH2)2OCH3) have been synthesized and examined by X-ray single crystal diffraction method. Hydrolysis reactions of the compounds liberate hydrogen in quantities ranging from 46 to 96% of the theoretical yield. The hydrolysis of Mg(BH4)2 and other borohydrides is also accompanied by the diborane formation. The amount of liberated diborane depends on the Mg-coordination environment. To explain this fact quantum-chemical calculations have been performed. It is shown that formation of Mg-O-Mg-bridges enables the side process of diborane generation. It means that the size and denticity of the ligand directly affects the amount of released diborane. In general, the larger the ligand and the higher its denticity, the smaller is amount of diborane produced. The new compound Mg(BH4)2 × diglyme decomposes without diborane formation that allows one to be considered as a new promising chemical hydrogen storage compound for the practical usage. |
| Databáze: | OpenAIRE |
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