RT journal article
T1 CuGaO2 delafossite as a high-surface area model catalyst for Cu+-activated reactions
A1 Fornero, Esteban L.
A1 Murgida, Gustavo E.
A1 Bosco, Marta V.
A1 Hernández Garrido, Juan Carlos
A1 Aguirre, Alejo
A1 Calaza, Florencia C.
A1 Stacchiola, Dario
A1 Ganduglia-Pirovano, M. Verónica
A1 Bonivardi, Adrian L.
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
K1 Time-resolved IR spectroscopy
K1 Photoelectron spectroscopy
K1 Electron microscopy
K1 Density functional calculations
K1 CO oxidation
AB Copper is one of the goldilocks metals in catalysis. Deciphering the local atomic environment and oxidation state of active centers in supported copper catalysts, as well as the design of materials to control their stability under reaction conditions remains a great challenge today. We show here that a mixed-oxide of copper delafossite with gallium (CuGaO2, Cu1+ and Ga3+) in the form of porous nanoplates, mainly exposing (1 1 0) facets with Cu1+ and Ga3+ cations in well-defined surface positions is a promising material as a model catalyst to explore the activity and stability of Cu1+-activated reactions. It is shown that the delafossite structure is preserved after calcination or reduction pretreatments (in pure O2 or H2, respectively). Extensive reduction of the mixed-oxide leads to a stable catalyst with higher activity for CO oxidation, as a result of the formation of geminal dicarbonyl species on Cuδ+, with 0 < δ < 1, under reaction conditions.
PB Academic Press Inc.
SN 0021-9517
YR 2023
FD 2023
LK http://hdl.handle.net/10498/31587
UL http://hdl.handle.net/10498/31587
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 13-nov-2026