MgH₂ + mischmetal nanostructured composite was synthesized from MgH₂ plus 6 and 10 wt% of mischmetal by ball-milling at various times. XRD studies revealed that cerium hydride was produced during the milling in all samples. Sievert test results indicated that the samples containing 6 wt% of mischmetal showed a higher desorption compared with the ones containing 10 wt% of mischmetal. The high amount of cerium hydride in the samples may be the reason, while hydrogen desorption properties decreased by adding more catalyst. Furthermore, BET results showed that the addition of the catalyst to the samples resulted in agglomerate formation in shorter milling times. The agglomerate formation increased with adding more amounts of mischmetal, thus decreasing the hydrogen desorption properties of the composite. The best results were obtained from the 30 h-milled sample containing 6 wt% of catalyst. The on-set desorption temperature of this sample was 100 °C lower than that of as-received MgH₂.

中文翻译：

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球磨制备的活化MgH 2 +混合金属纳米结构复合材料的性能

 由MgH ₂合成MgH ₂ +杂金属纳米结构复合材料在不同的时间通过球磨添加6和10 wt％的混合金属。XRD研究表明，所有样品在研磨过程中都会生成氢化铈。Sievert测试结果表明，与含有10 wt％混合稀土的样品相比，含有6 wt％混合稀土的样品显示出更高的脱附率。样品中氢化铈含量高可能是其原因，而氢气的解吸性能因添加更多催化剂而降低。此外，BET结果表明，向样品中添加催化剂会在更短的研磨时间内形成附聚物。随着添加更多的混合稀土，附聚物的形成增加，从而降低了复合材料的氢解吸性能。从含有6 wt％催化剂的30 h研磨样品中可获得最佳结果。₂。