RT Journal Article
T1 Exceptional Low-Temperature CO Oxidation over Noble-Metal-Free Iron-Doped Hollandites: An In-Depth Analysis of the Influence of the Defect Structure on Catalytic Performance
A1 Gómez Recio, Isabel
A1 Pan, Huiyan
A1 Azor Lafarga, Alberto Eduardo
A1 Ruiz González, María Luisa
A1 Hernando González, María
A1 Parras Vázquez, Marina Marta
A1 Fernández-Díaz, María Teresa
A1 Delgado, Juan J.
A1 Chen, Xiaowei
A1 Goma Jiménez, Daniel
A1 Portehault, David
A1 Sanchez, Clément
A1 Cabero Piris, Mariona
A1 Martínez-Arias, Arturo
A1 González Calbet, José María
A1 Calvino, José J.
AB A family of iron-doped manganese-related hollandites, KxMn1–yFeyO2−δ (0 ≤ y ≤ 0.15), with high performance in CO oxidation have been prepared. Among them, the most active catalyst, K0.11Mn0.876Fe0.123O1.80(OH)0.09, is able to oxidize more than 50% of CO at room temperature. Detailed compositional and structural characterization studies, using a wide battery of thermogravimetric, spectroscopic, and diffractometric techniques, both at macroscopic and microscopic levels, have provided essential information about this never-reported behavior, which relates to the oxidation state of manganese. Neutron diffraction studies evidence that the above compound stabilizes hydroxyl groups at the midpoints of the tunnel edges as in isostructural β-FeOOH. The presence of oxygen and hydroxyl species at the anion sublattice and Mn3+, confirmed by electron energy loss spectroscopy, appears to play a key role in the catalytic activity of this doped hollandite oxide. The analysis of these detailed structural features has allowed us to point out the key role of both OH groups and Mn3+ content in these materials, which are able to effectively transform CO without involving any critical, noble metal in the catalyst formulation.
PB American Chemical Society
SN 2155-5435
YR 2021
FD 2021
LK https://hdl.handle.net/20.500.14352/91875
UL https://hdl.handle.net/20.500.14352/91875
LA eng
NO Gómez-Recio, I.; Pan, H.; Azor-Lafarga, A.; Ruiz-González, M. L.; Hernando, M.; Parras, M.; Fernández-Díaz, M. T.; Delgado, J. J.; Chen, X.; Jiménez, D. G.; Portehault, D.; Sanchez, C.; Cabero, M.; Martínez-Arias, A.; González-Calbet, J. M.; Calvino, J. J. Exceptional Low-Temperature CO Oxidation over Noble-Metal-Free Iron-Doped Hollandites: An In-Depth Analysis of the Influence of the Defect Structure on Catalytic Performance. ACS Catal. 2021, 11, 15026-15039 DOI:10.1021/acscatal.1c04954.
NO European Commission
NO Ministerio de Ciencia e Innovación (España)
DS Docta Complutense
RD 16 abr 2025