The influence of particle size on the kinetics of UO2 oxidation in aqueous powder suspensions
2006 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 353, no 1-2, 75-79 p.Article in journal (Refereed) Published
Previous studies have indicated that the rate of a heterogeneous liquid-solid reaction depends on the size of the solid particles. It has been suggested that both the pre-exponential factor and the activation energy depend on the particle size. The processes involved in dissolution of UO2 have been extensively studied because of their importance for the safety analysis of a future deep repository for spent nuclear fuel and in many of these studies powder suspensions of UO2 are used as a model system. Therefore, it is of importance to investigate and quantify the particle size effect on the kinetics of UO2 oxidation in order to enable comparison of data from studies oil different solid substrates. In this work the influence of particle size on the second order rate constant and on the activation energy of the reaction between MnO4- and UO2 was studied using aqueousUO(2)-particle suspensions of four different size distributions. A comparative study of the activation energy for the reaction using a UO2 pellet was also performed.
Place, publisher, year, edition, pages
2006. Vol. 353, no 1-2, 75-79 p.
dissolution mechanism, uranium-dioxide, one-electron, reduction, oxidants
IdentifiersURN: urn:nbn:se:kth:diva-15821DOI: 10.1016/j.jnucmat.2006.03.005ISI: 000238770300009ScopusID: 2-s2.0-33744994983OAI: oai:DiVA.org:kth-15821DiVA: diva2:333863
QC 201005252010-08-052010-08-052010-09-08Bibliographically approved