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Magnetite and Maghemite as Gold-Supports for Catalyzed CO Oxidation at Low Temperature

A supported gold catalyst was prepared by the deposition-precipitation method from an aqueous solution of HAuCl4• 3H2O on synthesized Fe3O4. Calcination at different temperatures caused transformations of Fe3O4 to gamma-Fe2O3 and alpha-Fe2O3. CO oxidations over Au/Fe3O4 and Au/gamma-Fe2O3 were superior in comparison with Au/alpha-Fe2O3.

CO oxidation; supported gold catalysts; iron oxides; magnetite (Fe3O4); maghemite (gamma-Fe2O3); haematite (alpha-Fe2O3)

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