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首页> 美国卫生研究院文献>Materials >Mechanical and Thermal Dehydrogenation of the Mechano-Chemically Synthesized Calcium Alanate (Ca(AlH4)2) and Lithium Chloride (LiCl) Composite
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Mechanical and Thermal Dehydrogenation of the Mechano-Chemically Synthesized Calcium Alanate (Ca(AlH4)2) and Lithium Chloride (LiCl) Composite

机译：机械化学合成的丙酸钙（Ca（AlH4）2）和氯化锂（LiCl）复合材料的机械和热脱氢

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LiAlH4 and CaCl2 were employed for mechano-chemical activation synthesis (MCAS) of Ca(AlH4)2 and LiCl hydride composite. After short ball milling time, their X-ray diffraction (XRD) peaks are clearly observed. After ball milling for a longer duration than 0.5 h, the CaAlH5 diffraction peaks are observed which indicates that Ca(AlH4)2 starts decomposing during ball milling into CaAlH5+Al+1.5H2. It is estimated that less than 1 wt % H2 was mechanically dehydrogenated in association with decomposition reaction. After 2.5 h of ball milling, no Ca(AlH4)2 diffraction peaks were observed on XRD patterns which suggests that Ca(AlH4)2 was decomposed. Thermal behavior of ball milled powders, which was investigated by thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC), indicates that a certain fraction of Ca(AlH4)2 could have been disordered/amorphized during ball milling being undetectable by XRD. The apparent activation energy for the decomposition of Ca(AlH4)2 and CaAlH5 equals 135 kJ/mol and 183 kJ/mol, respectively.
机译：LiAlH4和CaCl2用于Ca（AlH4）2和LiCl氢化物复合物的机械化学活化合成（MCAS）。经过短暂的球磨时间后，可以清楚地观察到它们的X射线衍射（XRD）峰。球磨时间超过0.5小时后，观察到CaAlH5衍射峰，这表明Ca（AlH4）2在球磨过程中开始分解为CaAlH5 + Al + 1.5H2。据估计，与分解反应相关的机械脱氢少于1wt％。球磨2.5小时后，在XRD图上未观察到Ca（AlH4）2衍射峰，这表明Ca（AlH4）2分解了。通过热重分析（TGA）和差示扫描量热法（DSC）研究了球磨粉的热行为，表明在球磨过程中一定比例的Ca（AlH4）2可能已经无序/非晶化，而XRD无法检测到。 Ca（AlH 4 ） 2 和CaAlH 5 分解的表观活化能分别等于135 kJ / mol和183 kJ / mol 。

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