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Synthesis of activated ferrosilicon-based microcomposites by ball milling and their hydrogen generation properties
journal contribution
posted on 2018-03-27, 09:04 authored by Paul Brack, Sandie DannSandie Dann, Upul Wijayantha-Kahagala-Gamage, Paul L. Adcock, Simon E. FosterFerrosilicon was activated toward hydrogen generation by processing using ball milling. An activation energy of 62 kJ/mol was determined for the reaction of ball-milled ferrosilicon powder with sodium hydroxide solution, which is ca. 30 kJ/mol lower than that previously reported for unmilled ferrosilicon. A series of composite powders were prepared by ball milling ferrosilicon with various additives. Three different classes of additives were employed: salts, polymers and sugars. The effects of these additives on hydrogen generation from the reaction of ferrosilicon with 2 wt.% aqueous sodium hydroxide were investigated. It was found that composites formed of ferrosilicon and sodium chloride, potassium chloride, sodium polyacrylate, sodium polystyrene sulfonate-co-maleic acid or fructose showed reduced induction times for hydrogen generation compared to that observed for ferrosilicon alone, and all but fructose also led to an increase in the maximum hydrogen generation rate. In light of its low cost and toxicity and beneficial effects, sodium chloride is considered to be the most effective of these additives for activating ferrosilicon toward hydrogen generation.
Funding
This work was supported by the EPSRC and Intelligent Energy Ltd. PB would also like to thank the SCI for the award of a Messel Scholarship.
History
School
- Science
Department
- Chemistry
Published in
International Journal of Hydrogen EnergyCitation
BRACK, P. ...et al., 2018. Synthesis of activated ferrosilicon-based microcomposites by ball milling and their hydrogen generation properties. International Journal of Hydrogen Energy, 44 (35), pp.19113-19127.Publisher
© ElsevierVersion
- NA (Not Applicable or Unknown)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/Acceptance date
2018-02-20Publication date
2019-01-04Notes
This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/ISSN
0360-3199Publisher version
Language
- en