The Comparison in Dehydrogenation Properties and Mechanism between MgCl2(NH3)/LiBH4 and MgCl2(NH3)/NaBH4 Systems
The Comparison in Dehydrogenation Properties and Mechanism between MgCl2(NH3)/LiBH4 and MgCl2(NH3)/NaBH4 Systems
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DOI：
10.1021/jp103012t
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发表时间：
2010-05
影响因子：
3.7
通讯作者：
L. Gao;Yanhui Guo;Qin Li;Xuebin Yu
中科院分区：
文献类型：
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作者：
L. Gao;Yanhui Guo;Qin Li;Xuebin Yu
通过热重分析和质谱、X射线衍射(XRD)、固态11B NMR、傅里叶变换红外和差示扫描量热法(DSC)研究了MgCl2(NH3)/MBH4(其中M为Li或Na)的脱氢性质和机理。对于MgCl2(NH3)/LiBH4体系，球磨后发现形成了新相，即MgCl2(NH3)·LiBH4，这与下面的脱氢有关。从反应产物来看，证实MgCl2倾向于作为氨载体，并且从MgCl2转移的配体NH3能够与LiBH4在约10℃下结合释放出带有痕量氨的H2。 240℃。随着混合物中LiBH4含量的增加，氨的排放被完全抑制，配体NH3耗尽后，MgCl2与过量的LiBH4发生分解反应生成Mg(BH4)2，从而改善了整个体系的脱氢效果。对于MgCl2(NH3)/NaBH4体系，没有新相...
The dehydrogenation properties and mechanism of MgCl2(NH3)/MBH4 (here, M is Li or Na) were investigated by thermogravimetric analysis and mass spectrometry, X-ray diffraction (XRD), solid-state 11B NMR, Fourier transform infrared, and differential scanning calorimetry (DSC). As for the MgCl2(NH3)/LiBH4 system, it was found that a new phase, namely, MgCl2(NH3)·LiBH4, to which the following dehydrogenation relates, is formed after ball milling. Judging from the reaction products, it is confirmed that MgCl2 is inclined to work as an ammonia carrier, and the ligand NH3, transferring from MgCl2, is able to combine with the LiBH4 to release H2 with a trace of ammonia at ca. 240 °C. With the increase of LiBH4 content in the mixture, the emission of ammonia was totally suppressed, and Mg(BH4)2 was produced by the decomposition reaction of MgCl2 with the excessive LiBH4 after the ligand NH3 was exhausted, resulting in an improved dehydrogenation in the whole system. As for the MgCl2(NH3)/NaBH4 system, no new phase...