AN XPS STUDY OF THE INTERACTION OF AMMONIA AND NITRIC-OXIDE WITH FENOY AND ACTIVE-CARBON-SUPPORTED IRON-OXIDES

The interaction of nitric oxide and ammonia with iron oxides and active-carbon-supported iron oxides was investigated using X-ray photoelectron spectroscopy. Ammonia when interacting with iron(III) oxide at 200 or 260-degrees-C formed -NH2 groups stable in vacuum at the reaction temperature. Nitric oxide reacted neither with iron(III) at 200-degrees-C nor with Fe-NH2 complex but did so with oxidized FeO or metallic iron. From three models of the selective catalytic reaction of NO proposed in literature, the most likely for the reaction of NO+NH3 on unsupported and active-carbon-supported Fe2O3 catalysts was chosen.