An improved purification of NaBH4 from storage-induced impurities by ammonia assisted crystallization in diglyme
| Autor: | G.V. Odegova, Olga A. Bulavchenko, O. V. Netskina, O.V. Komova, Anna M. Ozerova, Sergei S. Arzumanov, Svetlana A. Mukha, V.I. Simagina |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Hydride Sodium Inorganic chemistry Energy Engineering and Power Technology chemistry.chemical_element Diglyme 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound Sodium borohydride Fuel Technology chemistry law Solubility Crystallization 0210 nano-technology Sodium carbonate Dissolution |
| Zdroj: | International Journal of Hydrogen Energy. 45:30756-30766 |
| ISSN: | 0360-3199 |
| Popis: | It was shown by ATR FTIR, XRD and 11B MAS NMR methods that increasing contents of sodium polyborate and sodium carbonate impurities were formed in solid sodium borohydride upon its storage and contact with the air. To increase the NaBH4 purity after storage, it was re-crystallized in diglyme using the well-known Brown's procedure. The purification efficiency was further improved by ammonia treatment during NaBH4 dissolution. It was found that the advantages of using the gaseous ammonia consisted in an increased NaBH4 solubility in diglyme and a more efficient reduction in the content of impurities to form a material consisting of uniform highly dispersed particles of the hydride having a regular cubic shape. It was found for the process of catalytic hydrolysis of NaBH4 that the rate of hydrogen generation and its yield increased with the decreasing content of impurities. These results demonstrate the importance of investigations aimed at improving the existing methods of NaBH4 purification and creating new ones. |
| Databáze: | OpenAIRE |
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