Manganese Defective Clustering: Influence on the Spectroscopic Features of Ceria-Based Nanomaterials
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Título
Manganese Defective Clustering: Influence on the Spectroscopic Features of Ceria-Based NanomaterialsAutoría
Fecha de publicación
2023-07-21Editor
American Chemical SocietyCita bibliográfica
AMARAL, D. C., et al. Manganese Defective Clustering: Influence on the Spectroscopic Features of Ceria-Based Nanomaterials. Inorganic Chemistry, 2023, vol. 62, no 31, p. 12392-12402.Tipo de documento
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info:eu-repo/semantics/submittedVersionPalabras clave / Materias
Resumen
The influence of manganese modification on the spectroscopic features of manganese-doped CeO2 systems synthesized by the microwave-assisted hydrothermal route and their correlation with the presence of O defective ... [+]
The influence of manganese modification on the spectroscopic features of manganese-doped CeO2 systems synthesized by the microwave-assisted hydrothermal route and their correlation with the presence of O defective structures were verified, focusing on their interaction with poisonous atmospheres. Raman and electron paramagnetic resonance studies confirmed the presence of defective clusters formed by dipoles and/or quadrupoles. The number of paramagnetic species was found to be inversely proportional to the doping concentration, resulting in an increase in the Mn2+ signal, likely due to the reduction of Mn3+ species after the interaction with CO. X-ray photoelectron spectroscopy data showed the pure system with 33% of its cerium species in the Ce3+ configuration, with an abrupt decrease to 19%, after the first modification with Mn, suggesting that 14% of the Ce3+ species are donating one electron to the Mn2+ ions, thus becoming nonparamagnetic Ce4+ species. On the contrary, 58% of the manganese species remain in the Mn2+ configuration with five unpaired electrons, corroborating the paramagnetic feature of the samples seen in the electron paramagnetic resonance study. [-]
Entidad financiadora
Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG) | Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ) | Fundaçao de Amparo à Pesquisa do Estado de São Paulo (FAPESP) | ANPCyT | Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET) | Margarita Salas Postdoctoral - European Union-Next Generation EU
Código del proyecto o subvención
13/07296-2 | 2018/20590-0 | 2020/02352-5 | PICT 2015-1832 | PUE 22920200100016CO-IFIMAR | MGS/2021/21 | UP2021-021
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Copyright © 2023 American Chemical Society
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