Hydrogen reduction of low-surface area uranium trioxide

The kinetics of the hydrogen reduction of uranium trioxide of surface area below 1.2m/sup 2//g were investigated. An increase in surface area and pore volume occurred during the reaction and an intermediate compound (composition, UO/ sub 2.6/ to UO/sub 2.7/) was formed. The initial rate of reductio...

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Veröffentlicht in:Transactions of the Faraday Society 1961, Vol.57, p.1400
Hauptverfasser: Morrow, Sheila A., Graves, S., Tomlinson, L.
Format: Artikel
Sprache:eng
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Zusammenfassung:The kinetics of the hydrogen reduction of uranium trioxide of surface area below 1.2m/sup 2//g were investigated. An increase in surface area and pore volume occurred during the reaction and an intermediate compound (composition, UO/ sub 2.6/ to UO/sub 2.7/) was formed. The initial rate of reductio n was found to be directly proportional to the surface area of the UO/sub 3/ and to (hydrogen partial pressure)/sup 0.7//sup 8/. The shape of the rate curve obtained was dependent on the nature of the UO/sub 3/ and the apparent activation energy for the reaction varied between 25 and 32 kcal/mole. The observed kinetics were best interpreted in terms of hydrogen chemisorption on the solid surface as the rate-controlling step. Hydration or the addition of sulfate ions to the trioxide greatly increased its surface area. (auth)
ISSN:0014-7672
DOI:10.1039/tf9615701400