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Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials
Published on: May 15, 2015
リチウムを含む多部構成の不安定化水素貯蔵システムの反応進行と反転性に対するH2部分圧力の影響
Tobias E C Price1, David M Grant, David Weston
1Energy and Sustainability Research Division, Engineering Faculty, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
Journal of the American Chemical Society
|July 16, 2011
まとめ
水素の偏圧は,リチウムボロヒドリド:マグネシウムヒドリドの分解に大きく影響する. 低圧では,冷却時に合金からLiHとMgが形成され,可逆性と水素放出測定に影響する.
科学分野:
- マテリアルサイエンス 材料科学
- 化学工学は化学工学というものです.
- 水素貯蔵庫は水素を貯蔵する場所です.
背景:
- LiBH(4):MgH(2) システムの分解経路は,真空下と水素圧下では異なっていることが知られている.
- 以前の研究では,この多成分ヒドリドシステムの,低部分圧の水素に対する感受性を調査していなかった.
研究 の 目的:
- 低部分圧の水素がLiBH ((4):MgH ((2) システムの分解に及ぼす影響を調査する.
- 反応産物と可逆性に対する真空条件の影響を理解する.
主な方法:
- インサイト粉末中性子 difraktion (デウテライドを使用) とX線 difraktion.
- 異なる真空システムを使用して,水素部分圧の制御された変化.
主要な成果:
- すべてのサンプルは,真空システムやステキオメトリに関係なく,Li-Mg合金を形成するために分解されます.
- 冷却すると,これらの合金には相不安定性があり,最も高効率の真空条件 (最も低いベース圧力) を除けば,LiHとMgを形成するために反応した.
- ex situ実験で進化した水素の見かけの量は,ダイナミックな真空条件の影響を受けます.
結論:
- LiBH ((4):MgH ((2)) の分解およびその後の製品の安定性は,低水素部分圧に対して敏感である.
- 不一致した真空条件は,多成分ヒドリドの研究では,再現できない結果につながる可能性があります.
- リチウムが豊富なサンプルにパッシバリングヒドリド層の形成は水素化を阻害し,報告された可逆性の違いを説明します.
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