Abstract: The catalytic activity and selectivity of FeZSM-5 catalysts for oxidation-dehydrogenation of ethylbenzene(EB) were examined at 823K and EB:O₂=1. 0. The influence of exchanged cations, hydrothermal treatment and dispersity of Fe₂O₃on oxidation-dehydrogenation activity of EB over FeZSM-5 was also studied. XPS, ESR and TPR techniques were used for the determination of states and properties of iron in FeZSM-5. The results indicate that framework iron and highly dispersed nonframework iron used as Lewis acidic sites and basic sites with suitable strength construct the active centers of EBoxidation-dehydrogenation.

Key words: FeZSM-5, Alkali cation, Oxidation-dehydrogenations of ethylbenzene, Hydrothermal treatment, Active centers