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Characterization of palladium species after γ-irradiation of a TBP–alkane–Pd(NO3)2 system

B. Simon 1 C. Bouyer 1 S. de Sio 2 C. Berthon 1 N. Boubals 1 F. Miserque 3 E. Brackx 1 N. Raymond 1 A. Chagnes 4 L. Berthon 1
1 LFC - DEN/DMRC/SFMA/LFC
DMRC - Département de recherche sur les procédés pour la mine et le recyclage du combustible : DEN/DMRC/SFMA/LFC
Abstract : The γ-irradiation of a biphasic system composed of tri-n-butylphosphate in tetrapropylene hydrogen (TPH) in contact with palladium(II) nitrate in nitric acid aqueous solution led to the formation of two precipitates. A thorough characterization of these solids was performed by means of various analytical techniques including X-Ray Diffraction (XRD), Thermal Gravimetric Analysis coupled with a Differential Scanning Calorimeter (TGA-DSC), X-ray Photoelectron Spectroscopy (XPS), InfraRed (IR), RAMAN and Nuclear Magnetic Resonance (NMR) Spectroscopy, and ElectroSpray Ionization Mass Spectrometry (ESI-MS). Investigations showed that the two precipitates exhibit quite similar structures. They are composed at least of two compounds: palladium cyanide and palladium species containing ammonium, phosphorous or carbonyl groups. Several mechanisms are proposed to explain the formation of Pd(CN)2.
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B. Simon, C. Bouyer, S. de Sio, C. Berthon, N. Boubals, et al.. Characterization of palladium species after γ-irradiation of a TBP–alkane–Pd(NO3)2 system. RSC Advances, Royal Society of Chemistry, 2018, 8, pp.21513-21527. ⟨10.1039/c8ra02695e⟩. ⟨cea-02339846⟩

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