Résumé
Fe-Cu-ZSM-5 and Ce-Fe-Cu-ZSM-5 solids prepared using solid-state ion exchange method (SSIE) were tested in the NH 3-SCR of NO reaction and were characterized using N 2 physisorption at 77 K, MAS 27 Al magnetic resonance, X-ray diffraction, scanning electron microscopy, EPR spectroscopy and transmission electron microscopy coupled to energy dispersive X-ray spectroscopy in order to follow the effect of Ce addition on the textural and structural properties of Fe-Cu-MFI system as well as the detection of the changes in local environment and state of iron and copper species, and the degradation of the zeolite texture and structure after a severe aging treatment at 850 °C for 5h. Fresh Ce-promoted sample showed better NO conversion up to 450 °C than unpromoted Fe-Cu-ZSM-5 catalyst. An activity loss was observed on aged catalysts, but remaining less pronounced for the catalyst 2 containing Ce. The changes in catalyst structure and texture did not occur during aging while a probable migration of metal active species and change in their coordination has occurred.