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
A1 Ruiz-González, María Luisa
A1 Hernando, María
A1 Parras, Marina
A1 Fernández-Díaz, María Teresa
A1 Delgado Jaén, Juan José
A1 Chen, Xiaowei
A1 Goma Jiménez, Daniel
A1 Portehault, David
A1 Sanchez, Clément
A1 Cabero, Mariona
A1 Martínez-Arias, A.
A1 González-Calbet, José M.
A1 Calvino Gámez, José Juan
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
K1 hollandites
K1 Fe modification
K1 CO oxidation
K1 defect structure
K1 atomic scale analysis
AB A family of iron-doped manganese-related hollandites,KxMn1−yFeyO2−δ (0 ≤ y ≤ 0.15), with high performance inCO oxidation have been prepared. Among them, the most activecatalyst, K0.11Mn0.876Fe0.123O1.80(OH)0.09, is able to oxidize morethan 50% of CO at room temperature. Detailed compositional andstructural characterization studies, using a wide battery ofthermogravimetric, spectroscopic, and diffractometric techniques,both at macroscopic and microscopic levels, have providedessential information about this never-reported behavior, whichrelates to the oxidation state of manganese. Neutron diffractionstudies evidence that the above compound stabilizes hydroxylgroups 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 lossspectroscopy, appears to play a key role in the catalytic activity of this doped hollandite oxide. The analysis of these detailedstructural features has allowed us to point out the key role of both OH groups and Mn3+ content in these materials, which are able toeffectively transform CO without involving any critical, noble metal in the catalyst formulation.
PB ACS
SN 2155-5435
YR 2021
FD 2021-12
LK http://hdl.handle.net/10498/25865
UL http://hdl.handle.net/10498/25865
LA eng
NO This work was supported by FEDER/Spanish Ministry ofScience and Innovation through Research Projects MAT2017-87579-R, MAT2017-82252-R, RTI2018-101604-B-I00,MCIN/AEI/10.13039/501100011033, Project PID2020-113006-RB-I00, and ENE2017-82451-C3-2-R. The authorsacknowledge the National Centre for Electron Microscopy(ELECMI National Singular Scientific Facility) for provision ofcorrected aberration microscopy.
DS Repositorio Institucional de la Universidad de Cádiz
RD 11-nov-2026