Hydrogen and Deuterium Solubility in Commercial Pd–Ag Alloys for Hydrogen Purification

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...

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Bibliographic Details
Published in:ChemEngineering 2017-12, Vol.1 (2), p.14
Main Authors: Paolone, Annalisa, Tosti, Silvano, Santucci, Alessia, Palumbo, Oriele, Trequattrini, Francesco
Format: Article
Language:English
Subjects:
Alloys
Chemical engineering
Deuterium
Enthalpy
Gases
Hydrogen
hydrogen purification
hydrogen solubility
Hydrogen storage
Hydrogenation
Palladium base alloys
Permeability
Phase transitions
Purification
Sieverts measurements
Silver base alloys
Solid solutions
Solubility
Temperature dependence
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Summary: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.
ISSN:2305-7084
2305-7084
DOI:10.3390/chemengineering1020014