RT journal article
T1 Improving the Redox Response Stability of Ceria-Zirconia Nanocatalysts under Harsh Temperature Conditions
A1 Arias Duque, Carolina
A1 Bladt, Eva
A1 Muñoz, Miguel A.
A1 Hernández Garrido, Juan Carlos
A1 Cauqui López, Miguel Angel
A1 Rodríguez-Izquierdo Gil, José María
A1 Blanco Montilla, Ginesa
A1 Bals, Sara
A1 Calvino Gámez, José Juan
A1 Pérez Omil, José Antonio
A1 Yeste Siguenza, María del Pìlar
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
AB By depositing ceria on the surface of yttrium-stabilized zirconia (YSZ) nanocrystals and further activation under high-temperature reducing conditions, a 13% mol. CeO2/YSZ catalyst structured as subnanometer thick, pyrochlore-type, ceria-zirconia islands has been prepared. This nanostructured catalyst depicts not only high oxygen storage capacity (OSC) values but, more importantly, an outstandingly stable redox response upon oxidation and reduction treatments at very high temperatures, above 1000 °C. This behavior largely improves that observed on conventional ceria-zirconia solid solutions, not only of the same composition but also of those with much higher molar cerium contents. Advanced scanning transmission electron microscopy (STEM-XEDS) studies have revealed as key not only to detect the actual state of the lanthanide in this novel nanocatalyst but also to rationalize its unusual resistance to redox deactivation at very high temperatures. In particular, high-resolution X-ray dispersive energy studies have revealed the presence of unique bilayer ceria islands on top of the surface of YSZ nanocrystals, which remain at surface positions upon oxidation and reduction treatments up to 1000 °C. Diffusion of ceria into the bulk of these crystallites upon oxidation at 1100 °C irreversibly deteriorates both the reducibility and OSC of this nanostructured catalyst.
PB American Chemical Society
SN 1520-5002
YR 2017
FD 2017
LK http://hdl.handle.net/10498/33804
UL http://hdl.handle.net/10498/33804
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 08-nov-2026