Abstract
Pd–Ag alloys with compositions close to 23–25% Ag are considered as a benchmark for hydrogen permeability. They are used in small scale reactors for hydrogen separation and purification. Permeability and solubility are strictly mathematically correlated, and the temperature dependence of solubility can provide useful information about the physical state of the material, the hydrogenation enthalpy, and the occurrence of different thermodynamic states. While the permeability of Pd–Ag alloys has been largely investigated, solubility measurements are available only in a restricted temperature range. In this paper, we extend solubility measurements up to 7 bar for Pd77Ag23 in the temperature range between 25 °C and 400 °C and for Pd30Ag70 for temperatures between 190 °C and 300 °C. The occurrence of solid solutions or hydride phases is discussed, and the hydrogenation enthalpy is calculated.
Highlights
It has been reported that nearly 2% of the world’s energy is stored in the hydrogen industrially produced each year
Pd–Ag alloys with compositions close to 23–25% Ag are considered as a benchmark for hydrogen permeability
They are used in small scale reactors for hydrogen separation and purification
Summary
It has been reported that nearly 2% of the world’s energy is stored in the hydrogen industrially produced each year. While the permeability of Pd–Ag alloys has been largely investigated, solubility measurements are available only in a restricted temperature range. The occurrence of solid solutions or hydride phases is discussed, and the hydrogenation enthalpy is calculated.
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