Catalytic reduction of U with hydrazine using Pt/SiO.sub.2 catalyst in nitric acid medium-kinetics and equilibrium

Kinetics of catalytic reduction of uranyl species, U(VI) to U(IV) with hydrazine nitrate was studied over Pt/SiO.sub.2 catalyst in nitric acid medium. Experiments were carried out in a stainless-steel autoclave as a function of mixing intensity, temperature, catalyst loading and concentration of nit...

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Bibliographic Details
Published inJournal of radioanalytical and nuclear chemistry Vol. 325; no. 2; p. 425
Main Authors Ramakrishna Reddy, S, Pandey, Niranjan Kumar, Mondal, Suraj, Sivaraman, N
Format Journal Article
LanguageEnglish
Published Springer 01.08.2020
Subjects
Activation energy
Analysis
Uranium
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Summary:Kinetics of catalytic reduction of uranyl species, U(VI) to U(IV) with hydrazine nitrate was studied over Pt/SiO.sub.2 catalyst in nitric acid medium. Experiments were carried out in a stainless-steel autoclave as a function of mixing intensity, temperature, catalyst loading and concentration of nitric acid, hydrazine and uranium. Langmuir-Hinshelwood approach was considered to derive various model equations and each of them was evaluated. Results of the present study indicated that catalytic reduction of U(VI) can be described by surface reaction between adsorbed molecules. The activation energy of the reaction was calculated to be 74.5 kJ/mol, suggesting a chemical reaction controlled process.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-020-07265-8