An investigation of the activity of coprecipitated gold catalysts for methane oxidation |
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| Authors: | R D Waters J J Weimer J E Smith |
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| Affiliation: | (1) Department of Chemical and Materials Engineering, University of Alabama in Huntsville, 35899 Huntsville, AL, USA;(2) Department of Chemistry, University of Alabama in Huntsville, 35899 Huntsville, AL, USA |
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| Abstract: | Coprecipitated Au on transition metal oxide catalysts have been tested for their activity toward methane oxidation. Catalyst activities fall in the order Au/Co3O4>Au/NiO> Au/MnOx> Au/Fe2O3 > Au/CeO. The Au/Co3O4 catalyst is active just below about 250°C. The catalysts are proposed to have more than one type of reactive site since the supports are also active at higher temperatures. Analysis of spent catalysts with X-ray photoelectron spectroscopy indicates that Au exists in at least two oxidation states on some of them, a reduced state and an oxidized state. The activity for methane oxidation increases with increasing oxidation of Auin the oxidized state. |
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| Keywords: | catalysis methane oxidation gold metal oxides X-ray photoelectron spectroscopy |
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