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Water as a promoter of the complete oxidation of volatile organic compounds over uranium oxide catalysts

Harris, Richard Huw, Boyd, Vicki J., Hutchings, Graham John ORCID: and Taylor, Stuart H. ORCID: 2002. Water as a promoter of the complete oxidation of volatile organic compounds over uranium oxide catalysts. Catalysis Letters 78 (1-4) , pp. 369-372. 10.1023/A:1014916920128

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The effect of water addition on the complete oxidation of benzene and propane VOCs by uranium oxide catalysts has been investigated. Benzene oxidation was studied using a silica supported U3O8 catalyst. Complete oxidation is promoted by the addition of 2.6 water compared with the reactivity when no water is added to the reactant feed. Increasing the water concentration to 12.1 resulted in a suppression of oxidation activity. Investigation of propane oxidation using U3O8 shows a dramatic promotion of activity. Propane conversion was ca. 50 at 600°C without added water, whilst it increased to 100 at 400°C with the addition of 2.6 water. A comparison of oxidation activity has been made with Mn2O3, an oxide recognized for complete oxidation. In contrast to the U3O8 catalysts the addition of 2.6 water suppresses the activity of Mn2O3. In situ powder X-ray diffraction studies showed that the bulk U3O8 structure was stable under all the reaction conditions. The origin of the increased activity is not clear but may be due to modification of the catalyst surface and the contribution from new reaction pathways such as steam reforming.

Item Type: Article
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Addition reactions; Catalyst supports; Chemical modification; Composition effects; Crystal structure; Oxidation; Thermal effects; Uranium compounds; Volatile organic compounds; Water; X ray powder diffraction, Promoter; Reactant feed; Uranium oxide catalysts, Catalysts
Additional Information: cited By (since 1996) 4
Publisher: Springer Verlag
ISSN: 1011-372X
Last Modified: 05 Jan 2023 14:20

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