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Artículo

Two-controlling mechanisms model for hydrogen desorption in the Li4(NH2)3BH4 doped Mg(NH2)2–2LiH system

Amica, GuillerminaIcon ; Cova, Federico HectorIcon ; Arneodo Larochette, Pierre PaulIcon ; Gennari, Fabiana CristinaIcon
Fecha de publicación: 03/2017
Editorial: Pergamon-Elsevier Science Ltd
Revista: International Journal of Hydrogen Energy
ISSN: 0360-3199
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Física Atómica, Molecular y Química

Resumen

The limiting step of the dehydrogenation process and the desorption kinetic model of the composite 0.7Mg(NH2)2–1.4LiH–0.2Li4(NH2)3BH4 under different hydrogen back pressures at low temperature (200 °C) were studied in this work. It was determined that a single mechanism model was not able to explain the behavior of the reaction at low and high reacted fractions simultaneously. A combination of two controlling mechanisms, which reproduce accurately the behavior of the system, was proposed. The rate equation deduced involves the contribution of a second grade Avrami model and a 3D diffusion model as a function of pressure and conversion. At low conversions, the limiting step of the reaction is the formation of the products. Once a thin layer of product is formed on the surface, the diffusion through it becomes the new limiting step. With pressure increase, the mechanism change occurs later during desorption due to the higher difficulty in creating nucleation points on a surface exposed to a higher concentration of hydrogen.
Palabras clave: Amides , Controlling Mechanism , Hydrogen Storage , Kinetics
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Atribución-NoComercial-SinDerivadas 2.5 Argentina (CC BY-NC-ND 2.5 AR)
Identificadores
URI: http://hdl.handle.net/11336/58227
DOI: http://dx.doi.org/10.1016/j.ijhydene.2016.11.079
URL: https://www.sciencedirect.com/science/article/pii/S0360319916333687
Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Amica, Guillermina; Cova, Federico Hector; Arneodo Larochette, Pierre Paul; Gennari, Fabiana Cristina; Two-controlling mechanisms model for hydrogen desorption in the Li4(NH2)3BH4 doped Mg(NH2)2–2LiH system; Pergamon-Elsevier Science Ltd; International Journal of Hydrogen Energy; 42; 9; 3-2017; 6127-6136
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