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Ce基催化劑對(duì)2LiBH4/MgH2放氫性能的影響
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國(guó)家自然科學(xué)基金 (51171168, 50671094); 國(guó)家重點(diǎn)基礎(chǔ)研究計(jì)劃 (2007CB209706)


Effects of Ce-Based Catalysts on Hydrogen Storage Properties of 2LiBH4/MgH2 Composite
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    摘要:

    采用球磨方法制備了2LiBH4/MgH2復(fù)合儲(chǔ)氫材料體系，用XRD、FTIR和儲(chǔ)氫性能測(cè)試手段等對(duì)復(fù)合體系結(jié)構(gòu)和儲(chǔ)氫性能進(jìn)行表征，研究了不同Ce基催化劑對(duì)復(fù)合體系放氫性能的影響，分析了催化劑的催化機(jī)理。結(jié)果表明：2LiBH4/MgH2復(fù)合物加熱過程為明顯的兩步放氫，第1步主要發(fā)生MgH2的分解放氫；第2步為第1步生成的Mg與LiBH4發(fā)生放氫反應(yīng)；添加Ce和CeF3都能提高2LiBH4/MgH2體系的放氫性能。Ce主要改善體系第2步放氫特性，CeF3對(duì)體系兩步放氫反應(yīng)均產(chǎn)生顯著效果。添加5 mol% CeF3使2LiBH4/MgH2體系起始放氫溫度降低約100 ℃，體系最大放氫量達(dá)到10.6% (質(zhì)量分?jǐn)?shù), 下同)；F-取代部分H-形成LiBH1-xFx，改善了LiBH4的分解特性，從而顯著改善了2LiBH4/MgH2體系的放氫性能

    Abstract:

    2LiBH4/MgH2 hydrogen storage composite was prepared by ball-milling technology, and its microstructures and hydrogen storage properties were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and hydrogen storage measurements. The effects of Ce-based catalysts on the hydrogen storage properties of the composite were studied. The results show that hydrogen release of 2LiBH4/MgH2 composite is a two-step process, i.e., the first is the decomposition of MgH2 and the second is the reaction between LiBH4 and Mg just produced. Ce or CeF3 addition can improve the dehydrogenation of 2LiBH4/MgH2 composite. Ce mainly improves the behavior of the second step reaction while CeF3 influences the behavior of the two steps greatly. For the 2LiBH4/MgH2 composite with addition of 5 mol% CeF3, the total hydrogen capacity reaches 10.6 wt% at 450 oC and the initial hydrogen release temperature is decreased by around 100 oC. LiBH1-xFx is formed by partial substitution of F- for H-, which decreases the decomposition temperature of LiBH4.

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王新華,徐 樓,吳曉誠(chéng),陳長(zhǎng)聘. Ce基催化劑對(duì)2LiBH4/MgH2放氫性能的影響[J].稀有金屬材料與工程,2011,40(11):1982~1985.[Wang Xinhua, Xu Lou, Wu Xiaocheng, Chen Changpin. Effects of Ce-Based Catalysts on Hydrogen Storage Properties of 2LiBH4/MgH2 Composite[J]. Rare Metal Materials and Engineering,2011,40(11):1982~1985.]
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  • 收稿日期:2011-03-21
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