Abstract
The selective catalytic reduction (SCR) of NO by C 3H 6 in excess oxygen was evaluated and compared over Ag/Al 2O 3 and Cu/Al 2O 3 catalysts. Ag/Al 2O 3 showed a high activity for NO reduction. However, Cu/Al 2O 3 showed a high activity for C 3H 6 oxidation. The partial oxidation of C 3H 6 gave surface enolic species and acetate species on the Ag/Al 2O 3, but only an acetate species was clearly observed on the Cu/Al 2O 3. The enolic species is a more active intermediate towards NO + O 2 to yield—NCO species than the acetate species on the Ag/Al 2O 3 catalyst. The Ag and Cu metal loadings and phase changes on Al 2O 3 support can affect the activity and selectivity of Ag/Al 2O 3 and Cu/Al 2O 3 catalysts, but the formation of enolic species is the main reason why the activity of the Ag/Al 2O 3 catalyst for NO reduction is higher than that of the Cu/Al 2O 3 catalyst.
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