{"title":"Comparative Analysis of UN and UO2 Oxidation in Air and Nitrogen Hemioxide","authors":"M. I. Volgin, S. A. Kulyukhin, Yu. M. Nevolin","doi":"10.1134/s1066362223060024","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Oxidation of UO<sub>2</sub> 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 N<sub>2</sub>O–N<sub>2</sub> and O<sub>2</sub>–N<sub>2</sub> were used with a 20% volume fraction of the oxidizing agent. For UO<sub>2</sub> and UN, the phase composition of the final oxidation product in air and in N<sub>2</sub>O is the same―U<sub>3</sub>O<sub>8</sub>. In both cases, N<sub>2</sub>O behaves as a milder oxidizing agent compared to atmospheric oxygen. Oxidation of UO<sub>2</sub> and UN in an N<sub>2</sub>O flow starts at a temperature 180 and 70°C higher than in air, respectively. The oxidation of UN in an N<sub>2</sub>O flow proceeds in three stages. At the first stage, the reaction products are UO<sub>2</sub> and U<sub>2</sub>N<sub>3</sub>; UO<sub>2</sub> is the product of the second stage; and at the third stage U<sub>3</sub>O<sub>8</sub> is produced. No pronounced staging is observed in the UO<sub>2</sub> oxidation process. The possibility of utilizing nitrogen hemioxide when it is used in the course of voloxidation (oxidation) of spent nuclear fuel is shown.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":null,"pages":null},"PeriodicalIF":0.9000,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Radiochemistry","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1134/s1066362223060024","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
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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.
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.
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