Abstract
The reduction of Np(V) with hydrazine in HNO3 solution in the presence of Ru/SiO2 catalysts was studied by spectrophotometry. The back oxidation of Np(IV) with nitric acid, also catalyzed by ruthenium, occurs concurrently with the Np(V) reduction with hydrazine. The contribution of each process is determined by the HNO3 concentration. The mechanism of the ruthenium-catalyzed reduction of Np(V) with hydrazine was suggested on the basis of the kinetic data. The effect of the size of Ru nanoparticles on the activation energy of the catalytic reduction of Np(V), characterizing the structural sensitivity of the heterogeneous-catalytic reaction (positive size effect), was revealed.
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Original Russian Text © A.V. Anan’ev, M.Yu. Boltoeva, M.S. Tyumentsev, I.G. Tananaev, 2012, published in Radiokhimiya, 2012, Vol. 54, No. 6, pp. 505–510.
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Anan’ev, A.V., Boltoeva, M.Y., Tyumentsev, M.S. et al. Catalytic reduction of Np(V) with hydrazine in nitric acid solutions in the presence of ruthenium catalysts. Radiochemistry 55, 52–58 (2013). https://doi.org/10.1134/S1066362213010104
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DOI: https://doi.org/10.1134/S1066362213010104