RT Journal Article
T1 Exploring reversible redox behavior in the 6H-BaFeO3−δ (0 < δ <0.4) system: impact of Fe3+/Fe4+ ratio on CO oxidation
A1 Gutiérrez Martín, Daniel
A1 Varela, Aurea
A1 Hernando González, María
A1 Torres Pardo, María De La Almudena
A1 Matesanz, Emilio
A1 Gómez-Recio, Isabel
A1 González-Calbet, José
A1 Fernández-Díaz, María Teresa
A1 Calvino, José Juan
A1 Cauqui, Miguel Angel
A1 Yeste, María Pilar
A1 Parras, Marina
AB This work is devoted to evaluating the relationship between the oxygen content and catalytic activity in the CO oxidation process of the 6H-type BaFeO3−δ system. Strong evidence is provided about the improvement of catalytic performance with increasing Fe average oxidation state, thus suggesting the involvement of lattice oxygen in the catalytic process. The compositional and structural changes taking place in both the anionic and cationic sublattices of the catalysts during redox cycles have been determined by temperature-resolved neutron diffraction. The obtained results evidence a structural transition from hexagonal (P63/mmc) to orthorhombic (Cmcm) symmetry. This transition is linked to octahedra distortion when the Fe3+ concentration exceeds 40% (δ values higher than 0.2). The topotactical character of the redox process is maintained in the δ range 0 < δ < 0.4. This suggests that the cationic framework is only subjected to slight structural modifications during the oxygen exchange process occurring during the catalytic cycle.
PB American Chemical Society
SN 0020-1669
SN 1520-510X
YR 2024
FD 2024
LK https://hdl.handle.net/20.500.14352/104645
UL https://hdl.handle.net/20.500.14352/104645
LA eng
NO Inorg. Chem. 2024, 63, 19, 8908–8918
DS Docta Complutense
RD 10 abr 2025