Abstract
Alumina–europia mixed oxides with 5 and 10 wt.% Eu2O3 were studied by Mössbauer spectroscopy, 27Al MAS-NMR and X-ray diffraction (XRD). The samples were prepared by the sol–gel technique. The XRD patterns for the calcined samples show a broad peak around 2θ = 30° which is assigned to the Eu2O3; after treatment with hydrogen at 1073 K no reduction to Eu+2 or Eu0 was observed. The NMR spectra show three peaks, which are assigned to the octahedral, pentahedral and tetrahedral aluminum sites; the intensity of each peak depends on the concentration of europium ions. The Mössbauer spectra of the calcined samples show a single peak near zero velocity which is attributed to the Eu+3; after H2 treatment at 1073 K similar spectra were obtained, suggesting Eu+3 is not reducibly at this temperature.
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Zhang G., Hattor H. and Tanabe K., Appl. Catal. 36 (1988), 189.
Shen J., Lochhead M. K., Chen Y. and Dumesic J. A., J. Phys. Chem. 99 (1995), 2384.
Rosynek M., Catal. Rev., Sci. Eng. 16 (1977), 111.
Miller J. and Ko E., Catal. Today 35(3) (1977), 269.
Philip N. and Delgass W., J. Catal. 33 (1974), 219.
Boolchand, Mishra P. K., Raukas M., Ellens A. and Schmidt P., Phys. Rev., B 65 (2002), 134429.
Massiot D., WINFIT Programme, Bruker-Franzen Analytic Gmbh, Berlin, 1993.
Fripiat J., Alvarez L., Sánchez J., Martínez E., Saniger J. and Sánchez N., Appl. Catal., A Gen. 215 (2001), 91.
Blumenfeld A. and Fripiat J., J. Phys. Chem., B 101 (1977), 6670.
Pecharromán C., Sobrados I., Iglesias J., Gonzalez-Carreño T. and Sanz J., J. Phys. Chem., B 103 (1999), 6160.
Wang J., Bokhimi X., Morales A., Novaro O., López T. and Gómez R., J. Phys. Chem., B 103 (1999), 299.
Greenwood N. and Gibb T., Mössbauer Spectroscopy, Chapman Hall Ltd, London, 1971.
Fujita K., Tanaka K., Hirao K. and Soga N., J. Am. Ceram. Soc. 81 (7) (1998), 1845.
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Nava, N., Salas, P., Llanos, M.E. et al. NMR and Mössbauer Study of Al2O3–Eu2O3 . Hyperfine Interact 161, 11–19 (2005). https://doi.org/10.1007/s10751-005-9187-z
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DOI: https://doi.org/10.1007/s10751-005-9187-z