Selective ammonia oxidation over ZSM-5 zeolite: Impact of catalyst’s support porosity and type of deposited iron species

Abstract

In the presented studies an influence of different parameters, such as zeolite sample porosity, form of used iron source ([Fe3(OAc)6O(H2O)3]+oligocations or FeSO4 solutions) and method of iron species deposition (ion-exchange, impregnation), on the catalytic activity in the process of the selective catalytic oxidation of ammonia (NH3-SCO) was studied. Conventional and mesoporous ZSM-5 zeolites, obtained by desilication and modified with iron species, were analysed with respect to their textural, surface and crystalline properties (N2-sorption, HRTEM, SEM, XRD) as well as the form of introduced Fe species (UV–vis-DRS). Ion-exchange with [Fe3(OAc)6O(H2O)3]+ oligocations and impregnation with these oligocations and FeSO4 solutions were found as the most effective methods of the zeolite samples activation for NH3-SCO.