Abstract
Gold supported on several metal oxides has been prepared with high dispersion by deposition-precipitation and coprecipitation methods. These catalysts are active for the reduction of NO with C 3H 6 in the presence of oxygen and moisture, the reaction temperature varied depending on the kind of metal oxide support and increasing in the order of α-Fe 2O 3 ∼ ZnO < MgO ∼ TiO 2 < Al 2O 3. The highest conversion to N 2 (about 70%) was obtained over Au/Al 2O 3 with a metal loading of 0.1–0.2 wt.-% at 700 K. The conversion of NO to N 2 over Au/Al 2O 3 was not reduced, but slightly increased by the presence of water, although over Al 2O 3 alone it was markedly depressed. Oxygen enhanced the reduction of NO by C 3H 6 and NO 2 reacted with C 3H 6 at lower temperatures than NO, indicating that NO reduction could take place through the oxidation of NO to NO 2, which might then react with C 3H 6.
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