RT journal article
T1 Effect of ceria surface modification on Au/TiO2 and Au/YSZ catalysts for the preferential oxidation of CO
A1 Manzorro Ureba, Ramón
A1 Mora Moreno, Carmen
A1 Montes Monroy, José Manuel
A1 Goma Jiménez, Daniel
A1 Blanco Montilla, Ginesa
A1 Trasobares Llorente, Susana
A1 Calvino Gámez, José Juan
A1 Hungría Hernández, Ana Belén
A1 Pérez Omil, José Antonio
A1 Martínez Arias, A.
A1 Cauqui López, Miguel Ángel
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
K1 Au catalysts
K1 Nanostructured ceria
K1 Metal-oxide interface
K1 CO-PROX
K1 DRIFTS
AB The development of efficient catalysts for CO preferential oxidation (CO-PROX) is crucial for H2 purification in PEMFC technologies. While Au nanoparticles show high activity for low-temperature CO oxidation, their selectivity toward H2 oxidation often decreases at higher temperatures. Modulating the metal-support interaction is key to achieving optimal catalytic performance and stability. Here, we investigate the effect of surface modification with ceria (CeO2) nanostructures on Au/TiO2 (reducible) and Au/YSZ (non-reducible) catalysts. Although the addition of ceria leads into a decrease in the number of active sites (evidenced by metal dispersion and DRIFTS experiments), it boosts CO conversion and selectivity at elevated temperatures, effectively shifting and broadening the optimal operating window to ranges suitable for high-temperature PEMFCs. A comprehensive characterization using STEM and DRIFTS reveals that ceria’s promotional role is highly dependent on the underlying oxide support, influencing both the ceria nanostructure and the electronic properties of the gold nanoparticles, which dictates the overall reaction pathway and catalyst stability. This work provides crucial insight for tailoring Au-based catalysts for diverse CO-PROX operational requirements.
PB Elsevier
SN 0016-2361
YR 2026
FD 2026
LK http://hdl.handle.net/10498/39148
UL http://hdl.handle.net/10498/39148
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 06-nov-2026