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• W2041959977 abstract "A series of manganese−cerium oxide composites with Mn concentrations in the range of 1−20 mol % in ceria was prepared by the solution combustion technique using urea as fuel. The nature, type, and oxidation state of Mn species in ceria were investigated by X-ray diffraction (XRD), diffuse reflectance UV−visible spectroscopy, electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy, and temperature-programmed reduction techniques. The study reveals that the method of preparation significantly influences the type of manganese species in ceria. Wet-impregnation, coprecipitation, and solid-state synthesis techniques lead to clustered MnOx-like species in the ceria matrix, while the present method of preparation (solution combustion route) yields a highly dispersed form of Mn species. In the reported series of samples, Mn is present mainly in +2 and +3 oxidation states and there is no evidence for the presence of Mn4+ species. Powder X-ray diffraction studies at variable temperatures (298−1323 K) indicate the formation of Ce1-xMnxO2-δ solid solutions. No separate MnOx-type phase was detected even at 1323 K. EPR studies reveal that the isolated Mn2+ and Mn3+ species are present in at least three different structural locations: species A, Mn ions in ceria−lattice defect sites; species B, Mn ions in framework Ce4+ locations; and species C, Mn ions in interstitial locations and at the surface of ceria. The Mn3+ ions in ceria exhibit a facile reduction and reoxidation behavior when exposed to dry hydrogen and subsequently to air at elevated temperatures. A highly dispersed state of Mn3+ and Mn2+ in ceria, facile redox behavior, and a synergistic Mn−ceria interaction are some of the unique properties of this material prepared by the solution combustion procedure." @default.
• W2041959977 created "2016-06-24" @default.
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• W2041959977 date "2005-06-21" @default.
• W2041959977 modified "2023-09-25" @default.
• W2041959977 title "Nature of Manganese Species in Ce₁_-<i>_x</i>Mn<i>_x</i>O_2-_δ Solid Solutions Synthesized by the Solution Combustion Route" @default.
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• W2041959977 doi "https://doi.org/10.1021/cm050401j" @default.
• W2041959977 hasPublicationYear "2005" @default.
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