Abstract

Abstract The potentiality of Ir/γ-Al 2 O 3 catalyst for the simultaneous removal of soot and NO x in the presence of O 2 has been investigated by using temperature programmed reaction (TPR) technique. Ir/γ-Al 2 O 3 exhibits a high activity. The simultaneous removal paths are that the NO 2 formation by the oxidation of NO promotes the soot oxidation and the CO formation by the soot oxidation reduces NO. Furthermore, the adsorbed–dissociation of NO 2 also promotes the NO x reduction. The comparison between Ir/γ-Al 2 O 3 and Pt/γ-Al 2 O 3 reveals that Ir/γ-Al 2 O 3 is a more effective catalyst for the simultaneous removal of soot and NO x .

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