Selective catalytic reduction of NO on copper-exchanged zeolites: the roleof the structure of the zeolite in the nature of copper-active sites

Copper-exchanged zeolites with different structures (CuMFI, CuMOR and CuY) used as catalysts on the selective catalytic reduction (SCR) of NO by prope ne have been studied. Different types of Cu species were identified (Cu2+, Cu+, and CuO) by H-2-TPR and NO TPD. The structure of each zeolite determin es the nature and concentration of those species and the catalytic behavior for SCR of NO by propene in the presence of oxygen. A correlation was obse rved between the catalytic activity, and the presence of isolated Cu2+ spec ies, which is enhanced by MFl structure. (C)1999 Elsevier Science B.V. All rights reserved.