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Abstract

Ferric oxide catalysts dispersed on silica and acidic silicas modified by the introduction of Al (SiO₂–Al₂O₃), Nb (SiO₂–Nb₂O₅) and Zr (SiO₂–ZrO₂) (ca. 30 mass%) were prepared by wet impregnation from ferric acetylacetonate. The structural (by XRD studies), morphological (by nitrogen adsorption/desorption studies) and electronic (by DRS/UV–vis) properties of both the fresh and used catalysts after their employment in the decomposition of N₂O were studied. Ferric oxide species with different nuclearity, and in different relative proportions, were observed on the surface of each support, viz. isolated Fe(III) species, 2d FeO_x dimer/oligomer aggregates and 3d Fe₂O₃ nanoparticles. Isolated Fe(III) species were most abundant on silica and silica–alumina, while 2d FeO_x oligomers and 3d Fe₂O₃ predominated on silica–niobia and silica–zirconia. The nature of the support considerably influenced the speciation of iron, thereby affecting the activity of the catalyst and its stability in the N₂O decomposition reaction. The introduction of Al₂O₃ into silica had a positive effect on the course of the reaction but the catalytic activity was not maintained, whilst the presence of Nb₂O₅ substantially limited the course of the reaction.

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Study of the Influence of the Nature of the Support on the Properties of Ferric Oxide in Relation to its Activity in the Decomposition of N 2 O

Abstract

References