Abstract
Two copper ion-exchanged zeolites, Cu/NaY and Cu/NaZSM-5 have been studied by several techniques (TPR, TPD of NO, IR spectroscopy of adsorbed NO and XPS) and their catalytic activity for NO decomposition have been determined under dynamic conditions. The results obtained here show that copper' is stabilized as Cu + in Cu/NaZSM-5 after calcination in air at 673 K, while in Cu/NaY the initial Cu + ions are easier oxidized to Cu 2+, this leading to a completely different catalytic behaviour in the reaction of NO decomposition. So, whereas the Cu/NaZSM-5 exhibits a high NO conversion at the reaction temperatures (573 and 873 K), the parent Cu/NaY zeolite becomes deactivated in the first stages of reaction.
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