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LiBH4/Li3AlH6復(fù)合物的放氫性能與機(jī)理
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國家自然科學(xué)基金 (51171168; 50671094)；浙江省自然科學(xué)基金 (Y4110147)


Dehydrogenation Properties and Mechanism of LiBH4/Li3AlH6 Composite
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    摘要:

    采用機(jī)械球磨法制備LiBH4/Li3AlH6 復(fù)合體系，通過TG/DSC/MS、XRD等方法對其儲(chǔ)氫性能及機(jī)理進(jìn)行研究，并對其放氫反應(yīng)激活能進(jìn)行計(jì)算。結(jié)果表明，LiBH4-Li3AlH6復(fù)合體系從室溫加熱到500 ℃條件下發(fā)生3步放氫反應(yīng)：首先，Li3AlH6分解生成Al并放出氫；然后部分生成的Al與LiBH4發(fā)生反應(yīng)放出氫氣；最后，剩余的Al與LiH反應(yīng)放出氫氣。復(fù)合體系總的放氫量達(dá)到8.5% (質(zhì)量分?jǐn)?shù), 下同)，完全放氫后的復(fù)合物在8 MPa和400 ℃條件下最大吸氫量達(dá)到4.9%。并對LiBH4-Li3AlH6復(fù)合體系放氫過程機(jī)理進(jìn)行了分析

    Abstract:

    LiBH4/Li3AlH6 hydrogen storage composite was prepared by ball-milling, and its hydrogen storage properties and mechanism were studied by TG/DSC/MS and XRD analysis. The activation energies of the dehydrogenation reactions were calculated. The experimental results show that LiBH4-Li3AlH6 composite dehydrogenates shows three reactions: (1) Li3AlH6 decomposes with hydrogen desorption and formation of Al; (2) part of Al reacts with LBH4 with hydrogen desorption; (3) Al reacts with LiH. The total hydrogen desorption capacity reaches 8.5 wt%. And the mechanism of hydrogen desorption process of LiBH4-Li3AlH6 composite was discussed

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吳曉誠,王新華,李壽權(quán),葛紅衛(wèi),陳立新,嚴(yán) 密,陳長聘. LiBH4/Li3AlH6復(fù)合物的放氫性能與機(jī)理[J].稀有金屬材料與工程,2012,41(8):1405~1408.[Wu Xiaocheng, Wang Xinhua, Li Shouquan, Ge Hongwei, Chen Lixin, Yan Mi, Chen Changpin. Dehydrogenation Properties and Mechanism of LiBH4/Li3AlH6 Composite[J]. Rare Metal Materials and Engineering,2012,41(8):1405~1408.]
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  • 收稿日期:2011-08-05
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