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Comparative Analysis of UN and UO2 Oxidation in Air and Nitrogen Hemioxide

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Abstract

Oxidation of UO2 and UN by atmospheric oxygen and nitrogen hemioxide, which is a hard-to-localize greenhouse gas, was investigated by thermal analysis. For oxidation, mixtures of N2O–N2 and O2–N2 were used with a 20% volume fraction of the oxidizing agent. For UO2 and UN, the phase composition of the final oxidation product in air and in N2O is the same―U3O8. In both cases, N2O behaves as a milder oxidizing agent compared to atmospheric oxygen. Oxidation of UO2 and UN in an N2O flow starts at a temperature 180 and 70°C higher than in air, respectively. The oxidation of UN in an N2O flow proceeds in three stages. At the first stage, the reaction products are UO2 and U2N3; UO2 is the product of the second stage; and at the third stage U3O8 is produced. No pronounced staging is observed in the UO2 oxidation process. The possibility of utilizing nitrogen hemioxide when it is used in the course of voloxidation (oxidation) of spent nuclear fuel is shown.

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ACKNOWLEDGMENTS

The work was carried out using the equipment of the Center for Collective Use of Physical Research Methods of the Institute Physical Chemistry and Electrochemistry, Russian Academy of Sciences.

Funding

The study was carried out with financial support from the Ministry of Science and Higher Education of the Russian Federation.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071, Moscow, Russia

    M. I. Volgin, S. A. Kulyukhin & Yu. M. Nevolin

  2. Lomonosov Moscow State University, 119991, Moscow, Russia

    M. I. Volgin

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  1. M. I. Volgin
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  2. S. A. Kulyukhin
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  3. Yu. M. Nevolin
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Correspondence to M. I. Volgin.

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Translated from Radiokhimiya, No. 6, pp. 512–517, December, 2023 https://doi.org/10.31857/S0033831123060023

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Volgin, M.I., Kulyukhin, S.A. & Nevolin, Y.M. Comparative Analysis of UN and UO2 Oxidation in Air and Nitrogen Hemioxide. Radiochemistry 65, 628–633 (2023). https://doi.org/10.1134/S1066362223060024

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