Study of the surface and redox properties of ceria–zirconia oxides

CeO 2–ZrO 2 oxides with different CeO 2 content (1–12 wt%) were prepared by the impregnation method. The effects of CeO 2 content, calcination temperature and interaction between the components on the structure and reductive properties of CeO 2–ZrO 2 oxides were evaluated by using different techniqu...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2008-03, Vol.337 (1), p.86-96
Main Authors: Damyanova, S., Pawelec, B., Arishtirova, K., Huerta, M.V. Martinez, Fierro, J.L.G.
Format: Article
Language:English
Subjects:
Catalysis
Ceria–zirconia oxides
Chemistry
DRS
Exact sciences and technology
FTIR
General and physical chemistry
Raman
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TPR
XPS
XRD
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Summary:CeO 2–ZrO 2 oxides with different CeO 2 content (1–12 wt%) were prepared by the impregnation method. The effects of CeO 2 content, calcination temperature and interaction between the components on the structure and reductive properties of CeO 2–ZrO 2 oxides were evaluated by using different techniques such as XRD, DRS, FTIR, Raman, XPS, TGA and TPR. Spectroscopic data showed that the tetragonal phase of zirconia is preserved in all CeO 2–ZrO 2 oxides, although they retain a high number of defect sites caused by a strong interaction between zirconia and cerium oxide species. An enrichment of the zirconia surface with a fluorite structure of CeO 2 is observed for the CeO 2–ZrO 2 oxide with the highest CeO 2 content (12 wt%). The samples subjected to consecutive reduction–oxidation cycles at different temperatures showed good redox properties related to the increase of oxygen mobility. It was concluded that these CeO 2–ZrO 2 oxide systems, displaying high surface and good thermal stability, are similar to chemically mixed oxides due to the strong interaction between the zirconia carrier and deposited ceria. The effect of CeO 2 content, calcination temperature and interaction between components on the structure and redox properties of CeO 2–ZrO 2 oxides was evaluated. At the highest CeO 2 loading (12 wt%) and after high temperature treatment of 1073 K an enrichment of the zirconia surface with a fluorite structure of CeO 2 is observed in the figure. XRD of CeO 2, ZrO 2 and CeO 2–ZrO 2 oxides with different CeO 2 content after temperature treatment at 823 (A) and 1073 K (B). ▪
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2007.12.005