RESUMOCatalisadores Fe-ZSM-5 tem mostrado alta atividade para decomposição de N 2 O (de-N 2 O), mas poucos trabalhos apresentam o seu desempenho junto com gases que coexistem nas emissões (CO 2 Palavras-chave: óxido nitroso, catalisador, Fe-ZSM-5, Fe-BETA. ABSTRACTFe-ZSM-5 catalysts has shown high activity for decomposition of N 2 O (de-N 2 O), but few works show their performance with coexisting gas emissions (CO 2 , CH 4 , O 2 and H 2 O). Recently, Fe-BETA presented N 2 O conversion more high than Fe-ZSM-5, however, the activity of these catalysts still needs to compare in real conditions. This work aims to study the performance of Fe-BETA, Fe-ZSM-5 and Fe 2 O 3 in the de-N 2 O with addition of gases present in real conditions. For this, Fe-BETA (prepared by ion exchange), Fe-ZSM-5 and Fe 2 O 3 catalysts were calcined, characterized by XRF, XRD and H 2 -TPR and, evaluated in the N 2 O decomposition in the presence of CO 2 , CH 4 , O 2 and H 2 O. The results showed the presence of iron oxide on surface and iron ions compensating load in the structure of the zeolites. The N 2 O conversion increased with increasing reaction temperature and the Fe-ZSM-5 and Fe-BETA catalysts were much more active than Fe 2 O 3 pure. These results show that the iron species in the exchange position of zeolites are the most active for the reaction of N 2 O decomposition. The Fe-ZSM-5 and Fe-BETA catalysts showed high activity (> 90%) and resistance in the presence of CO 2 , CH 4 , O 2 and H 2 O. Fe-BETA was more selective the reaction of decomposition of N 2 O and showed great potential for the reduction of N 2 O emissions in real conditions.