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

IF 0.9 Q4 CHEMISTRY, INORGANIC & NUCLEAR

Radiochemistry Pub Date : 2024-02-19 DOI:10.1134/S1066362223060024

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

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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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UN 和 UO2 在空气和二氧化氮中的氧化对比分析

摘要通过热分析研究了大气中的氧气和二氧化氮（一种难以定位的温室气体）对二氧化铀和联合国的氧化作用。在氧化过程中，使用了氧化剂体积分数为 20% 的 N2O-N2 和 O2-N2 混合物。对于二氧化铀和联合国，最终氧化产物在空气中和在一氧化二氮中的相组成相同--U3O8。在这两种情况下，与大气中的氧气相比，N2O 是一种较温和的氧化剂。二氧化铀和联合国军在一氧化二氮气流中开始氧化时的温度分别比在空气中高 180°C 和 70°C。UN 在一氧化二氮气流中的氧化过程分为三个阶段。在第一阶段，反应产物是 UO2 和 U2N3；UO2 是第二阶段的产物；第三阶段产生 U3O8。在二氧化铀氧化过程中没有观察到明显的分级。这说明在乏核燃料的伏氧化（氧化）过程中使用二氧化氮的可能性。

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来源期刊

Radiochemistry CHEMISTRY, INORGANIC & NUCLEAR-

CiteScore

1.30

自引率

33.30%

发文量

期刊介绍： Radiochemistry is a journal that covers the theoretical and applied aspects of radiochemistry, including basic nuclear physical properties of radionuclides; chemistry of radioactive elements and their compounds; the occurrence and behavior of natural and artificial radionuclides in the environment; nuclear fuel cycle; radiochemical analysis methods and devices; production and isolation of radionuclides, synthesis of labeled compounds, new applications of radioactive tracers; radiochemical aspects of nuclear medicine; radiation chemistry and after-effects of nuclear transformations.