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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Kinetics of dehydrogenation of MgH_2 and AlH_3
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Kinetics of dehydrogenation of MgH_2 and AlH_3

机译：MgH_2和AlH_3的脱氢动力学

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摘要

Kinetics of dehydrogenation was studied using isothermal barometry, TDS and SEM methods. Two stages of the decomposition process are considered: incubation preceding the formation of metallic nuclei on the surface of the particle and hydrogen evolution via these metallic regions serving as facilitating chan?nels for desorption. Duration of the first stage depends on the temperature of the sample. Relationship with material's electronic band structure is discussed. Kinetics of the second stage is controlled by two reactions: desorption of the hydrogen molecules from the surface and shift of the metal-hydride inter?phase in the bulk. Physical mechanisms of decomposition with detailed reaction kinetics are proposed and kinetic parameters are evaluated.
机译：使用等温气压法，TDS和SEM方法研究了脱氢动力学。考虑了分解过程的两个阶段：在颗粒表面上形成金属核之前的温育以及通过这些金属区域作为解吸通道的氢放出。第一阶段的持续时间取决于样品的温度。讨论了与材料的电子能带结构的关系。第二阶段的动力学由两个反应控制：氢分子从表面解吸和主体中金属氢化物中间相的移动。提出了具有详细反应动力学的分解物理机理，并评估了动力学参数。

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