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Mechanochemical synthesis of NaBH4 starting from NaH–MgB2 reactive hydride composite system

Garroni, S. and Minella, C. Bonatto and Pottmaier, D. and Pistidda, C. and Milanese, C. and Marini, A. and Enzo, S. and Mulas, G. and Dornheim, M. and Baricco, M. and Gutfleisch, O. and Suriñach, S. and Baró, M. Dolors (2013):
Mechanochemical synthesis of NaBH4 starting from NaH–MgB2 reactive hydride composite system.
In: International Journal of Hydrogen Energy, Elsevier Science Publishing, pp. 2363-2369, 38, (5), ISSN 03603199,
[Online-Edition: http://dx.doi.org/10.1016/j.ijhydene.2012.11.136],
[Article]

Abstract

The present investigation focuses on a new synthesis route of NaBH4 starting from the 2NaH + MgB2 system subjected to mechanochemical activation under reactive hydrogen atmosphere. The milling process was carried out under two different hydrogen pressures (1 and 120 bar) with two different rotation speeds (300 and 550 rpm). The reaction products were characterized by ex-situ solid state magic angle spinning (MAS) nuclear magnetic resonance (NMR), ex-situ X-ray powder diffraction (XRPD) and Infrared Spectroscopy (IR). From the results of these analyses, it can be concluded that milling in all the considered conditions led to the formation of NaBH4 (cubic-Fm-3m). In particular, a reaction yield of 5 and 14 wt% is obtained after 20 h of milling at 120 bar of H2 for the tests performed at 300 rpm and 550 rpm, respectively. The presence of MgH2 is also detected among the final products on the as milled powders. The influence of the milling conditions and the evaluation of the parameters related the mechanochemical process are here discussed.

Item Type: Article
Erschienen: 2013
Creators: Garroni, S. and Minella, C. Bonatto and Pottmaier, D. and Pistidda, C. and Milanese, C. and Marini, A. and Enzo, S. and Mulas, G. and Dornheim, M. and Baricco, M. and Gutfleisch, O. and Suriñach, S. and Baró, M. Dolors
Title: Mechanochemical synthesis of NaBH4 starting from NaH–MgB2 reactive hydride composite system
Language: English
Abstract:

The present investigation focuses on a new synthesis route of NaBH4 starting from the 2NaH + MgB2 system subjected to mechanochemical activation under reactive hydrogen atmosphere. The milling process was carried out under two different hydrogen pressures (1 and 120 bar) with two different rotation speeds (300 and 550 rpm). The reaction products were characterized by ex-situ solid state magic angle spinning (MAS) nuclear magnetic resonance (NMR), ex-situ X-ray powder diffraction (XRPD) and Infrared Spectroscopy (IR). From the results of these analyses, it can be concluded that milling in all the considered conditions led to the formation of NaBH4 (cubic-Fm-3m). In particular, a reaction yield of 5 and 14 wt% is obtained after 20 h of milling at 120 bar of H2 for the tests performed at 300 rpm and 550 rpm, respectively. The presence of MgH2 is also detected among the final products on the as milled powders. The influence of the milling conditions and the evaluation of the parameters related the mechanochemical process are here discussed.

Journal or Publication Title: International Journal of Hydrogen Energy
Volume: 38
Number: 5
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Hydrogen storage, Sodium borohydride, Reactive hydride composites, Mechanochemistry, Gas–solid reaction, MAS-NMR
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 26 Apr 2013 07:27
Official URL: http://dx.doi.org/10.1016/j.ijhydene.2012.11.136
Identification Number: doi:10.1016/j.ijhydene.2012.11.136
Funders: This study was supported by the European Commission under MRTN-Contract ‘‘Complex Solid State Reactions for Energy Efficient Hydrogen Storage” (MRTN-CT-2006-035366), 2009-SGR-1292 , and by the Italian Ministry of University (PRIN project “Synthesis, characterization and functional evaluation of light hydrides-based nanostructured composites for solid state hydrogen storage”)., The author (M.D.B.) was partially supported by ICREA ACADEMIA award.
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