IR study on the reduction of NO and NO2 by hydrazine monohydrate over Fe-BEA zeolite

The adsorption of NO and NO 2 and their subsequent reduction by hydrazine monohydrate (HDM) over Fe-BEA zeolite were investigated using an FT-IR spectrophotometer equipped with an in-situ cell. Although NO and NO 2 molecules were adsorbed on Fe species in an unaltered state, some of them reacted with oxygen atoms, resulting in the adsorption of NO 2 and NO 3 − , respectively. The reducing species that had originated from HDM on Fe-BEA selectively reduced these molecules to N 2 , while a small amount of N 2 O was formed in the reduction of NO by HDM. NO and NO 2 were rapidly reduced by HDM through their adsorbed state even at 150 °C, and Fe species were required for their adsorption and for the formation of reducing species from HDM.