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

Consiglio Nazionale delle Ricerche, Istituto dei Sistemi Complessi, U.O.S. La Sapienza, Piazzale A. Moro 5, 00185 Roma, Italy
Dipartimento Fusione e Tecnologie per la Sicurezza Nucleare, ENEA, Via E. Fermi 45, 00044 Frascati (RM), Italy
Dipartimento di Fisica, Sapienza Università di Roma, Piazzale A. Moro 5, 00185 Roma, Italy
Author to whom correspondence should be addressed.
ChemEngineering 2017, 1(2), 14;
Received: 20 October 2017 / Revised: 6 November 2017 / Accepted: 9 November 2017 / Published: 12 November 2017
PDF [2152 KB, uploaded 12 November 2017]


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. View Full-Text
Keywords: hydrogen purification; hydrogen solubility; Sieverts measurements hydrogen purification; hydrogen solubility; Sieverts measurements

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Paolone, A.; Tosti, S.; Santucci, A.; Palumbo, O.; Trequattrini, F. Hydrogen and Deuterium Solubility in Commercial Pd–Ag Alloys for Hydrogen Purification. ChemEngineering 2017, 1, 14.

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