Abstract

The operational characteristics of a paired metal hydride system are strongly dependent on the amount of hydrogen gas which is transferred from one metal hydride as hydrogen donor to the other metal hydride as hydrogen acceptor. In such a dehydriding-hydriding process the amount of hydrogen gas which is transferable between the paired metal hydrides is considered as the result of the dynamic pressure-temperature-composition ( P- T- C) behaviours in such a combined system. These dynamic P- T- C behaviours are studied from the experimental P- C and P- T diagrams in order to analyse the effect of operational parameters which influence the system characteristics. Correlations between dynamic P- C behaviours and static P- C relationships revealed that the actual pressure difference (defined as the dynamic pressure driving force) determines the pressure levels of the given system and the amount of hydrogen transferred through dehydriding and hydriding reactions. Three different types of pressure driving forces under equilibrium (static) conditions are also discussed in connection with the dynamic pressure driving force which is obtained from the experimental dynamic study of a paired metal hydride system.

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