Details

Autor(en) / Beteiligte

• Hernández, W.Y.
• Laguna, O.H.
• Centeno, M.A.
• Odriozola, J.A.

Titel

Structural and catalytic properties of lanthanide (La, Eu, Gd) doped ceria

Ist Teil von

• Journal of solid state chemistry, 2011-11, Vol.184 (11), p.3014-3020

Ort / Verlag

Amsterdam: Elsevier Inc

Erscheinungsjahr

2011

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Ce 0.9 M 0.1O 2− δ mixed oxides ( M=La, Eu and Gd) were synthesized by coprecipitation. Independent of the dopant cation, the obtained solids maintain the F-type crystalline structure, characteristic of CeO 2 (fluorite structure) without phase segregation. The ceria lattice expands depending on the ionic radii of the dopant cation, as indicated by X-ray diffraction studies. This effect also agrees with the observed shift of the F 2g Raman vibrational mode. The presence of the dopant cations in the ceria lattice increases the concentration of structural oxygen vacancies and the reducibility of the redox pair Ce 4+/Ce 3+. All synthesized materials show higher catalytic activity for the CO oxidation reaction than that of bare CeO 2, being Eu-doped solid the one with the best catalytic performances despite of its lower surface area. In this work, Ce 0.9 M 0.1O 2− δ mixed oxides ( M=La, Eu and Gd) were synthesized by coprecipitation. Independent of the dopant cation, the obtained solids maintain the F-type crystalline structure, characteristic of CeO 2 (fluorite structure) without phase segregation. The ceria lattice expands depending on the ionic radii of the dopant cation, as indicated by X-ray diffraction studies. This effect also agrees with the observed shift of the F 2g Raman vibrational mode. The presence of the dopant cations in the ceria lattice increases the concentration of structural oxygen vacancies and the reducibility of the redox pair Ce 4+/Ce 3+. All synthesized materials show higher catalytic activity for the CO oxidation reaction than that of bare CeO 2, being Eu-doped solid the one with the best catalytic performances despite of its lower surface area. [Display omitted] ► Lanthanide doped ceria as catalytic supports for CO oxidation reaction. ► A higher concentration of oxygen vacancies promotes a higher catalytic activity. ► Eu-doped ceria shows improved catalytic properties for the CO oxidation reaction.