Abstract
Metal hydrides have been considered for use in hydrogen recovery units, hydrogen storage beds, heat pumps, and thermal compressors for cryocoolers. The absorption kinetics of hydrogen into a LaNi{sub 4.75}Al{sub 0.25}/n-octane slurry was investigated in a stirred reactor. The rate-determining step was hydrogen absorption into the liquid n-octane phase in agreement with the model proposed by Reilly and Johnson. The activation energy was found to be approximately 8.4 kJ/mol of H{sub 2}. Although the activation energies for hydrogen absorption into various slurry combinations are quite scattered, the data reported here indicate that the overall kinetics is sufficient for many practical applications.
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