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Reduction of uranium oxide U3O8 to UO2 by hydrogen

Abstract : The reduction of U3O8 by hydrogen at 510 °C has been studied by thermogravimetry. After a first reduction to UO2, the sample is oxidised; then the analysis of the shape of the kinetic curves of a second reduction leads to the determination of the specific growth rate, according to a contracting-sphere model provided that the rate-limiting step occurs on the external surface of the particles. A mechanism of reduction is then proposed which accounts for the observed variations of the rate with the partial pressure in hydrogen.
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https://hal-emse.ccsd.cnrs.fr/emse-00610176
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Submitted on : Thursday, July 21, 2011 - 11:46:11 AM
Last modification on : Wednesday, June 24, 2020 - 4:18:16 PM

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Michèle Pijolat, Catherine Brun, Françoise Valdivieso, Michel Soustelle. Reduction of uranium oxide U3O8 to UO2 by hydrogen. Solid State Ionics, Elsevier, 1997, 101-103 (part 2), pp.931-935. ⟨10.1016/S0167-2738(97)00385-8⟩. ⟨emse-00610176⟩

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