RT journal article
T1 Tuning the Integration Rate of Ce(Ln)O2 Nanoclusters into Nanoparticulated ZrO2 Supports: When the Cation Size Matters
A1 Barroso Bogeat, Adrián
A1 Daza Raposo, Iván
A1 Blanco Montilla, Ginesa
A1 Pintado Caña, José María
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
K1 ceria-zirconia
K1 rare-earth dopants
K1 thermochemical ageing treatments
K1 redox behaviour
K1 X-ray photoelectron spectroscopy
AB Three nanostructured catalysts with low total rare earth elements (REEs) content (i.e., 15 mol.%) were prepared by depositing CeO(2)or Ln(3+)-doped CeO2(Ln(3+)= Y(3+)or La3+; Ln/Ce = 0.15) on the surface of ZrO(2)nanoparticles, as nanometre-thick, fluorite-type clusters. These samples were subjected to successive reduction treatments at increasing temperatures, from 500 to 900 degrees C. A characterisation study by XPS was performed to clarify the diffusion process of cerium into the bulk of ZrO(2)crystallites upon reduction to yield Ce(x)Zr(1-x)O(2-delta)surface phases, and the influence of the incorporation of non-reducible trivalent REE cations, with sizes smaller (Y3+) and larger (La3+) than Ce(4+)and Ce3+. For all nanocatalysts, a reduction treatment at a minimum temperature of 900 degrees C was required to accomplish a significant cerium diffusion. Notwithstanding, the size of the dopant noticeably affected the extent of this diffusion process. As compared to the undoped ZrO2-CeO(2)sample, Y(3+)incorporation slightly hindered the cerium diffusion, while the opposite effect was found for the La3+-doped nanocatalyst. Furthermore, such differences in cerium diffusion led to changes in the surface and nanostructural features of the oxides, which were tentatively correlated with the redox response of the thermally aged samples.
PB MDPI
SN 1996-1944
YR 2020
FD 2020-06
LK http://hdl.handle.net/10498/23563
UL http://hdl.handle.net/10498/23563
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 13-nov-2026