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Título: | Chemical structures of coprecipitated Fe-Ce mixed oxides |
Autor: | Pérez-Alonso, F. J.; López Granados, M.; Ojeda, M.; Terreros Ceballos, Pilar CSIC ; Rojas, S. ; Herranz, Tirma CSIC ; García Fierro, José Luis CSIC ORCID; Gracia, Mercedes CSIC ; Gancedo, J. R. CSIC | Palabras clave: | Catalysts Cations Hematite Oxides Solutions |
Fecha de publicación: | 31-mar-2005 | Editor: | American Chemical Society | Citación: | Chemistry of Materials 17(9): 2329-2339 (2005) | Resumen: | Two series of Fe−Ce catalysts were prepared following two different methods: coprecipitation from Fe and Ce nitrate solutions and physical mixing of pure Fe and Ce precursors. Evidence of the presence of a chemical interaction between Fe and Ce was found in the calcined state of the coprecipitated catalysts. Such evidence was obtained with different techniques. The Fe−Ce interaction occurs through the formation of hematite-like and cubic ceria-like solid solutions. In the hematite-like solid solution, Ce cations are dissolved in the hematite structure, whereas in the cubic ceria-like solid solution Fe cations are dissolved in the ceria structure. Such interactions were absent in the samples prepared by the physical mixing. It is suggested that the Fe−Ce interaction present in the calcined state results in a strong Fe−Ce interaction in the final catalyst that defines their better catalytic properties. When tested in the Fischer−Tropsch synthesis of hydrocarbons from CO + H2 gas mixtures, the coprecipitation method series showed higher CO conversion rates, higher hydrocarbon formation rates, and a higher degree of olefinicity than the pure Fe catalyst sample and the Fe−Ce samples prepared by physical mixing. | Versión del editor: | http://dx.doi.org/10.1021/cm0477669 | URI: | http://hdl.handle.net/10261/332211 | DOI: | 10.1021/cm0477669 | ISSN: | 0897-4756 | E-ISSN: | 1520-5002 |
Aparece en las colecciones: | (IQF) Artículos |
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