Abstract
A step-wise method is employed in order to characterize the dehydriding kinetics of LaNi 4.7Al 0.3 hydride under isochoric and variable pressure conditions. A rate equation is derived by taking account of the reversible characteristics of the dehydriding and hydriding reactions dn dt = kn a{1−( n f n ) a( p p f ) b} The dehydriding kinetics in the α + β phase are discussed in detail. The rate constants obtained are kept constant regardless of hydrogen concentration and system pressure under isothermal conditions. The reaction order with respect to hydrogen concentration and hydrogen pressure are determined as 0.5 and 1 respectively. The apparent activation energy of the dehydriding reaction is determined to be 54.1 kJ (mol H 2) −1. Nucleation and growth is suggested to be the rate-controlling step.
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