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

被引：6
作者：
Adams, Marcus [1 ]
Grant, David M. [1 ]
Stuart, Alastair [1 ]
Walker, Gavin S. [1 ]
机构：
[1] Univ Nottingham, Fac Engn, Energy Technol Res Inst, Adv Mat Res Grp, Nottingham NG7 2RD, England
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2019年 / 44卷 / 55期
基金：
英国工程与自然科学研究理事会;
关键词：
Magnesium hydrogenation; Thermochemical energy storage; Shrinking-core model; Knudsen diffusion; PCT equation; Langmuir; ENERGY STORAGE-SYSTEMS; MASS-TRANSFER; HYDRIDE; HEAT; DESTABILIZATION; SIMULATION;
D O I：
10.1016/j.ijhydene.2019.04.036
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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 (sigma(s)) is introduced, whereby it has the capability to reduce the reaction rate. To improve representation of sigma(s), 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. Crown Copyright (C) 2019 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.
引用
收藏
页码：29123 / 29131
页数：9
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