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Activity and mechanism of uranium oxide catalysts for the oxidative destruction of volatile organic compounds

Taylor, Stuart Hamilton, Heneghan, Catherine S., Hutchings, Graham John and Hudson, Ian D. 2000. Activity and mechanism of uranium oxide catalysts for the oxidative destruction of volatile organic compounds. Catalysis Today 59 (3) , pp. 249-259. 10.1016/S0920-5861(00)00291-1

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Abstract

Uranium oxide based catalysts have been investigated for the oxidative destruction of volatile organic compounds (VOCs) to carbon oxides and water. The catalysts have been tested for the destruction of range of organic compounds at space velocities up to 70000 h-1. Destruction efficiencies greater than 99 can be achieved over the appropriate uranium based catalyst in the temperature range 300-450°C. Volatile organic compounds investigated include benzene, butylcetane, cyclohexanone, toluene, methanol, acetylene, butane, chlorobutane and chlorobenzene. The catalysts are thermally stable, destroy low concentrations and mixtures of VOCs and the lifetime studies indicate that deactivation during oxidation of chlorinated VOCs did not occur. A temporal analysis of products (TAPs) reactor is used to investigate the mechanism of oxidation of VOCs by uranium oxide catalysts. Studies indicated that VOCs were oxidised directly to carbon oxides on the catalyst surface. A combination of TAP pulse experiments with oxygen present and absent in the gas phase has indicated that the lattice oxygen from the catalyst is responsible for the total oxidation activity. This has been confirmed by studies using isotopically labelled oxygen which indicates that the catalyst operates by a redox mechanism.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Acetylene; Benzene; Butane; Catalyst deactivation; Methanol; Mixtures; Oxidation; Thermodynamic stability; Toluene; Uranium; Volatile organic compounds, Lattice oxygen; Oxidative destruction; Temporal analysis of products; Total oxidation activity; Uranium oxide catalyst, Catalyst activity
Additional Information: cited by (since 1996) 42
Publisher: Elsevier Science Publishers B.V., Amsterdam, Netherlands
ISSN: 09205861
Last Modified: 04 Jun 2017 02:10
URI: http://orca.cf.ac.uk/id/eprint/10305

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