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Magnesium hydride for energy storage applications: The kinetics of dehydrogenation under different working conditions

Opened Access Magnesium hydride for energy storage applications: The kinetics of dehydrogenation under different working conditions

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Autor: Perejón Pazo, Antonio
Sánchez Jiménez, Pedro Enrique
Criado Luque, José Manuel
Pérez Maqueda, Luis Allan
Departamento: Universidad de Sevilla. Departamento de Química Inorgánica
Fecha: 2016
Publicado en: Journal of Alloys and Compounds, 681, 571-579.
Tipo de documento: Artículo
Resumen: A new approach to the kinetics of magnesium hydride dehydrogenation is considered. A model able to predict the dehydrogenation under different experimental conditions has been proposed. A new combined kinetic analysis method, which considers the thermodynamic of the process according to the microreversibility principle, has been used for performing the kinetic analysis of data obtained under different thermal schedules at hydrogen pressures ranging from high vacuum up to 20 bar. The kinetic analysis shows that the dehydrogenation mechanism of magnesium hydride depends on the experimental conditions. Thus, the reaction follows a first order kinetics, equivalent to an Avarmi-Erofeev kinetic model with an Avrami coefficient equal to 1, when carried out under high vacuum, while a mechanism of tridimensional growth of nuclei previously formed (A3) is followed under hydrogen pressure. An explanation of the change of mechanism is given. It has been shown that the activation energy is closed ...
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Cita: Perejón Pazo, A., Sánchez Jiménez, P.E., Criado Luque, J.M. y Pérez Maqueda, L.A. (2016). Magnesium hydride for energy storage applications: The kinetics of dehydrogenation under different working conditions. Journal of Alloys and Compounds, 681, 571-579.
Tamaño: 996.5Kb
Formato: PDF

URI: https://hdl.handle.net/11441/79353

DOI: 10.1016/j.jallcom.2016.04.191

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