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Abstract
Two-step experiments were conducted to investigate the mechanism of NO χ reduction over copper ion-exchanged ZSM-5 zeolites. The first step was the formation of a reactive intermediate and the second one the reaction of this intermediate during a transient regime without any hydrocarbon injection. The presence of NO or NO 2 appears to be mandatory to obtain such an intermediate. In contrast, the presence of oxygen is not necessary. The intermediate reacts only with NO 2 as well as with O 2. The role of oxygen could be to oxidize NO to NO 2 in a first reaction step.
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