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We measured Pressure-Composition-Temperature relation for the Pd-H system using 150 u m, 1 ,u m particle size of Pd powder samples and a Pd powder with 150 u m after alkaline pretreatment, respectively. These different samples have marked influence on equilibrium reaction of the Pd-H system.

We measured Pressure-Composition-Temperature relation for the LaNi 5-H system using 9mm in the side influence on equilibrium pressure in the vicinity of hydrogen solubility limit of the LaNi 5-H system. KEY WORDS p-C-T relation , hydrogen solubility REFERENCES 1

The aim of this study is to elucidate the role of each substituent such as Al, Mn and Co in the H2 absorption of LaNi4.5 Al0.5, LaNi4 .5 Mn0.5, LaNi2 .5 Co2.5 alloys by the measurements of temperature and pressure dependences of the H2 absorption rate. The pressure dependence of the reaction rate was pbserved, but the pressure dependence of the reaction rate was independt of the temperature change between 273K and 353K.And the activation energies of reaction rates of all sampls were lower than that of LaNi5. The effect of substitution was clearly observed in the kinetics.

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