Modelling a kinetic deviation of the magnesium hydrogenation reaction at conditions close to equilibrium

Adams, Marcus; Grant, David M.; Stuart, Alastair; Walker, Gavin S.

Abstract

A model has been derived for the magnesium hydrogenation reaction at conditions close to equilibrium. The reaction mechanism involves an adsorption element, where the model is an extension of the Langmuir adsorption model. The concept of site availability (σs) is introduced, whereby it has the capability to reduce the reaction rate. To improve representation of σs, an adaptable semi-empirical equation has been developed. Supplement to the surface reaction, a rate equation has been derived considering resistance effects. It was found that close to equilibrium, surface resistance dominated the reaction.

Citation

Adams, M., Grant, D. M., Stuart, A., & Walker, G. S. (2019). Modelling a kinetic deviation of the magnesium hydrogenation reaction at conditions close to equilibrium. International Journal of Hydrogen Energy, 44(55), 29123-29131. https://doi.org/10.1016/j.ijhydene.2019.04.036

• Journal Article Type: Article
• Acceptance Date: Apr 3, 2019
• Online Publication Date: May 3, 2019
• Publication Date: Nov 8, 2019
• Deposit Date: May 22, 2019
• Publicly Available Date: May 22, 2019
• Journal: International Journal of Hydrogen Energy
• Print ISSN: 0360-3199
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 44
• Issue: 55
• Pages: 29123-29131
• DOI: https://doi.org/10.1016/j.ijhydene.2019.04.036
• Keywords: Magnesium hydrogenation; Thermochemical energy storage; Shrinking-core model; Knudsen diffusion; PCT equation; Langmuir
• Public URL: https://nottingham-repository.worktribe.com/output/2078724
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0360319919314272#ack0010