Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.649424
Title: Cobalt oxide catalysts for the total oxidation of propane
Author: Pinnell, Rebecca
ISNI:       0000 0004 5355 0989
Awarding Body: Cardiff University
Current Institution: Cardiff University
Date of Award: 2014
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Abstract:
The three-way catalyst (TWC) greatly reduces emissions of hydrocarbons, carbon monoxide and nitrogen oxides from gasoline powered vehicles. However up to 80% of all hydrocarbons are emitted in the first 120 seconds after the engine is started, before the TWC achieves light-off. Catalysts which are active at lower temperatures offer a potential solution to this ‘cold-start’ problem. Co3O4 is one of the most active transition metal oxide catalysts for the total oxidation of hydrocarbons. In this work the synthesis of bulk and supported cobalt oxide catalysts has been investigated. The catalysts were thoroughly characterised and tested for the total oxidation of propane, a model hydrocarbon. Variables in the mechanochemical synthesis and precipitation of bulk Co3O4 were studied. Cobalt hydroxycarbonate hydrate synthesised by both techniques was found to give rise to active and stable Co3O4 catalysts upon calcination. Small Co3O4 crystallites, high surface areas, weak Co3+-O bonds, and the absence of contaminants were found to be required for high propane oxidation activity. Deposition precipitation, wet impregnation and powder blending methods were investigated for supporting Co3O4 on a high surface area, non-porous silica. Wet impregnation from cobalt nitrate was found to be the most effective method of synthesising supported Co3O4 with minimal formation of undesired cobalt silicates. Activity increased with increased cobalt weight loading but supported catalysts displayed lower activity than bulk catalysts.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.649424  DOI: Not available
Keywords: QD Chemistry
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