Mechanochemical Synthesis of Sodium Borohydride by Recycling Sodium Metaborate

详细信息    查看全文

• 作者：Lingyan Kong ; Xinyu Cui ; Huazi Jin ; Jie Wu ; Hao Du ; Tianying Xiong
• 刊名：Energy & Fuels
• 出版年：2009
• 出版时间：October 15, 2009
• 年：2009
• 卷：23
• 期：10
• 页码：5049-5054
• 全文大小：820K
• 年卷期：v.23,no.10(October 15, 2009)
• ISSN：1520-5029

文摘

Hydrogen can be easily produced from the catalytic hydrolysis of sodium borohydride (NaBH₄), with sodium metaborate (NaBO₂) being the co-product. If NaBO₂ can be economically recycled in the process, NaBH₄ could be considered as a promising hydrogen carrier in fuel cells because of its high hydrogen content. In this paper, we report our investigation into the synthesis of NaBH₄ from NaBO₂ via ball milling. The starting materials for the synthesis were NaBO₂ and magnesium hydride (MgH₂). After ball milling at ambient temperature in inert gas, NaBH₄ and magnesium oxide (MgO) were produced. The synthesized NaBH₄ was extracted from the admixture by isopropylamine. Our results indicated that the yield of NaBH₄ from this process was 71 wt % when the MgH₂/NaBO₂ mole ratio, ball/powder ratio (BPR), inert gas (argon) pressure, and milling time were 2.07:1, 50:1, 200 kPa, and 2 h, respectively. The mole ratio of the reactants (MgH₂ and NaBO₂), ball-milling time, BPR, and milling atmosphere were found to have significant influence over NaBH₄ synthesis. We present the results and discuss the effects of these key parameters in this paper.