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Catalysts based on BaZrO3 with different elements incorporated in the structure I: BaZr(1-x)PdxO3 systems for total oxidation (Articolo in rivista)

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Catalysts based on BaZrO3 with different elements incorporated in the structure I: BaZr(1-x)PdxO3 systems for total oxidation (Articolo in rivista) (literal)

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F. Cifà; P. Dinka; P. Viparelli; S. Lancione; G. Benedetti; P.L. Villa; M. Viviani; P. Nanni (2003)
Catalysts based on BaZrO3 with different elements incorporated in the structure I: BaZr(1-x)PdxO3 systems for total oxidation
in Applied catalysis. B, Environmental (Print); ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, AMSTERDAM (Paesi Bassi)
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F. Cifà; P. Dinka; P. Viparelli; S. Lancione; G. Benedetti; P.L. Villa; M. Viviani; P. Nanni (literal)

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Dipartimento di Chimica, Ingegneria Chimica e Materiali, Monteluco di Roio, 67040 L'Aquila, Italy; CNR Instituto per l'Energetica e le Interfasi, via de Marini 6, 16149 Genoa, Italy; Dipartimento di Ingegneria Chimica e di Processo, via Balbi 5, 16126 Genoa, Italy (literal)

Titolo

Catalysts based on BaZrO3 with different elements incorporated in the structure I: BaZr(1-x)PdxO3 systems for total oxidation (literal)

Abstract

New catalytic systems, synthesized by a variant of citrate route, are proposed for total oxidation reactions. They consist of solid solutions-barium, zirconium, palladium and oxygen-with a perovskite structure and a formula BaZr(1-x)PdxO3. Detailed analysis of the X-ray diffraction (XRD) diffractograms and the TGA cycles show that Pd is randomly distributed as Pd-IV among the B sites of the perovskite, together with Zr. The full reduction of the catalyst is completed at around 1450 °C, whereas the re-oxidation of the reduced palladium occurs 150 °C-higher than for Pd-IV supported on gamma-alumina. The catalysts were tested for the catalytic combustion of methane; it was found that, although the catalysts tested were unsupported, the light-off temperature at 20% of methane conversion was roughly 400 °C. These preliminary results suggest that these systems might be suitable for both low and high temperature applications. (literal)

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