Silver deposition from its nitrate solutions by hydrogenated palladium

The currentless deposition of Ag + cations from silver nitrate solutions has been found on the surface of hydrogenated Pd (Pd−H). This process has been shown to proceed via a chemico-catalytic mechanism. It has been demonstrated that the major fraction of silver deposited onto the Pd-H system from t...

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Bibliographic Details
Published in:Theoretical foundations of chemical engineering 2017-05, Vol.51 (3), p.262-265
Main Authors: Solodkova, L. N., Vashchenko, S. V., Lyakhov, B. V., Bardyshev, I. I., Tsivadze, A. Yu, Chernyshev, V. V., Shiryaev, A. A.
Format: Article
Language:English
Subjects:
Catalysis
Cations
Chemistry
Chemistry and Materials Science
Colloids
Crystallites
Deposition
Dilution
Hydrogen storage
Hydrogenation
Industrial Chemistry/Chemical Engineering
Nitrates
Palladium
Silver
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Summary:The currentless deposition of Ag + cations from silver nitrate solutions has been found on the surface of hydrogenated Pd (Pd−H). This process has been shown to proceed via a chemico-catalytic mechanism. It has been demonstrated that the major fraction of silver deposited onto the Pd-H system from the nitrate solutions in the first 0.5–1 h of holding in the solution. A minimal size of silver crystallites (26–40 nm) was found when deposited from the diluted nitrate solutions that contain 0.32–2.5 g/L of Ag. The study has revealed that the currentless Ag deposition on the Pd–H surface is accompanied by the formation of the colloid phase of Ag crystallites. It has been established that the Pd–H system could purify solutions of Ag + when the amount of hydrogen in Pd exceeded the amount of Ag + in the solution.
ISSN:0040-5795
1608-3431
DOI:10.1134/S0040579517030137