Nitrogen Oxide Decomposition on Cerium Modified ZSM-5 Zeolite in the Presence of Oxygen

In this study ZSM-5-type zeolite was synthesized by sol-gel and Cu-(Ce)-ZSM-5 catalysts were prepared by ion-exchange. The prepared catalysts were characterized by XRD, TPD, ICP-AES, FTIR and tested in the removal of NO in the presence of oxygen. The results showed that oxygen had obviously negative impact on activity of catalysts due most Cu⁺ were oxided to Cu²⁺ with increasing of temperature. The introduction of Ce can improve the resistance of catalysts to oxygen in some degree. Modified catalysts exhibited the highest activity at about 623 K and then decreased with temperature increased. The amount of Ce retained in the zeolite might has impact on activity of prepared catalysts.