Abstract
The hydriding-dehydriding reaction of the H 2-MH systems is complex gas-solid reaction. The reaction exhibits reversible and some other unique thermodynamic and kinetic characteristics. Rate equations for the hydriding and the dehydriding reactions of the H 2-MH system were derived by taking account of their unique characteristics. Definition of the apparent rate constant and the apparent activation energy was described in detail. Based on the change of reaction rate with temperature, a specific rate coefficient was defined. By means of the rate equations, the intrinsic kinetic behavior in different phase regions may be distinguished using some parameters. The reaction kinetics of the LaNi 4.7Al 0.3-H system were determined by a step-wise method in different phase regions. The hydriding and dehydriding reactions were found to proceed quite differently in different phase regions. Although the reaction order, apparent rate constant, apparent activation energy and rate-controlling steps change with phase regions, they are kept constant within a given phase region. The apparent activation energy of the dehydriding reaction is always larger than that of the hydriding reaction.
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