Title: Hydrogen Catalytic Effects of Nanostructured Alloy Particles in Spent Fuel on Radionuclide Immobilization
Citation: APPLIED CATALYSIS B-ENVIRONMENTAL vol. 94 no. 1-2 p. 173-178
Publication Year: 2010
JRC N°: JRC56419
ISSN: 0926-3373
URI: http://www.elsevier.com/locate/apcatb
DOI: 10.1016/j.apcatb.2009.11.006
Type: Articles in periodicals and books
Abstract: For the first time, hydrogen catalytic effects of fission product alloy particles nondestructively extracted from spent nuclear fuel were demonstrated. The redox sensitive radionuclides at oxidized forms Se(IV), Tc(VII), U(VI), Np(V) and Pu(VI) were found to be stable in a solution saturated with a gas mixture (Ar + 10% H2 + 0.03% CO2) but rapidly immobilized in the same solution when contacted with the particles. In comparison, a synthetic alloy sample with similar elemental composition as the alloy particles generated in nuclear fuel displayed a smaller, but unequivocal catalytic effect. The smaller catalytic effect of synthetic alloy was apparently enhanced by a b-radiation source. The information obtained in this work contributes to improved understanding of the redox chemistry of radionuclides in nuclear waste geologic repository environments and, in particular, of the catalytic properties of these unique alloy particles.
JRC Directorate:Nuclear Safety and Security

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