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首页> 外文期刊>International Journal of Technology >Desorption Temperature Characteristic of Mg-based Hydrides Catalyzed by Nano-SiO2 Prepared by High Energy Ball Milling
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Desorption Temperature Characteristic of Mg-based Hydrides Catalyzed by Nano-SiO2 Prepared by High Energy Ball Milling

机译：高能球磨制备的纳米SiO2催化镁基氢化物的解吸温度特性

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Magnesium-based hydrogen storage alloy is one of the most attractive hydrogen storage materials for fuel cell-powered vehicle application. However, a high desorption temperature and slow kinetics limit its practical application. Extensive efforts are required to overcome these problems, one of which is inserting a metal oxide catalyst. In this work, we reported the current progress of using nano-silica (SiO2) as a catalyst to improve the thermodynamics and kinetics of magnesium hydride (MgH2). Nano-SiO2 was extracted from local rice husk ash (RHA) using the co-precipitation method. Then, the MgH2 was catalyzed with a small amount of nano-SiO2 (1 wt%, 3 wt%, and 5 wt%) and prepared using a high-energy milling technique. The microstructure and hydrogen desorption performance were studied using x-ray diffraction (XRD), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). The results of the XRD test showed that the milling process over 5 h reduced the material to a nanometer scale. Then, SEM images showed that the powders were agglomerated after 5 h of milling. Furthermore, it was also found that nano-SiO2 reduced the hydrogen desorption temperature of MgH2 to 338°C in 14.75 min when the 5 wt% variation of the catalyst was applied.
机译：镁基储氢合金是燃料电池驱动的车辆应用中最有吸引力的储氢材料之一。然而，高的解吸温度和缓慢的动力学限制了其实际应用。需要大量努力来克服这些问题，其中之一是插入金属氧化物催化剂。在这项工作中，我们报告了使用纳米二氧化硅（SiO2）作为催化剂改善氢化镁（MgH2）的热力学和动力学的最新进展。使用共沉淀法从当地稻壳灰（RHA）中提取了纳米SiO2。然后，用少量的纳米SiO 2（1wt％，3wt％和5wt％）催化MgH 2并使用高能研磨技术制备。使用X射线衍射（XRD），扫描电子显微镜（SEM）和差示扫描量热法（DSC）研究了显微结构和氢脱附性能。 XRD测试的结果表明，在5小时内的研磨过程将材料减小至纳米级。然后，SEM图像显示粉末在研磨5小时后附聚。此外，还发现当施加5wt％的催化剂变化时，纳米SiO 2在14.75min内将MgH 2的氢解吸温度降低到338℃。

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