Abstract
Catalyst doping is a critical approach to improve the kinetics of MgH2. However, reported activation energy (Ea) values of catalyzed MgH2 systems show a large discrepancy. This study investigates the effect of the driving force on Ea for (de)hydrogenation reactions. The kinetic rate constant is calculated using Johnson-Mehl-Avrami-Kolomogorov (JMAK) model. Ea is obtained according to a series of kinetic measurements under a nearly constant driving force. Under a low driving force (PIn/Peq=1.5), the Ea for dehydrogenation and hydrogenation are calculated to be 102.3±5.0 and 41.6±7.5 kJ/mol H2, respectively. Under a high driving force (PIn/Peq=10), the Ea for dehydrogenation and hydrogenation are calculated to be 101.4±25.8 and 57.4±5.0 kJ/mol H2, respectively. The result shows that the high driving force leads to higher hydrogenation Ea over the Ea obtained the low driving force, while dehydrogenation Ea remains unchanged under different driving forces.
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