Free Access
J. Chim. Phys.
Volume 95, Number 9, October 1998
Page(s) 2048 - 2060
DOI: 10.1051/jcp:1998353

J. Chim. Phys. Vol. 95, N°9  p. 2048-2060

Influence of the activation conditions on the elimination of residual impurities on ceria-zirconia mixed oxides

M. Daturi1, 2, C. Binet1, J.C. Lavalley1, H. Vidal3, 4, J. Kaspar3, M. Graziani3 and G. Blanchard5

1  Laboratoire de Catalyse et Spectrochimie, UMR 6506, ISMRA, 6 boulevard du Maréchal Juin, 14050 Caen cedex, France
2  On leave from Istituto di Chimica, Facoltà di Ingegneria, Piazzale J.F. Kennedy, Fiera del Mare, 16129 Genova, Italy
3  Dipartimento di Scienze Chimiche, Università di Trieste, via Giorgieri 1, 34127 Trieste, Italy
4  On leave from Departamento de Ciencia de los Materiales y Ingenieria Metalurgica y Quimica Inorganica, Universidad de Cadiz, 11510 Puerto Real, Spain
5  Rhodia Recherches, 52 rue de la Haie Coq, 93308 Aubervilliers cedex, France

A series of samples belonging to the ceria-zirconia solid solution has been investigated from the point of view of surface impurities, via TPO/TPD and FTIR spectroscopy. Species likely due either to the precursors or to atmospheric contamination have been taken into account and their stability has been studied following two different thermal treatments. A complete cleaning treatment is proposed in order to obtain powders of satisfactory quality for catalytic purposes.

Les impuretés superficielles contenues dans une série d'oxydes mixtes cérine- zircone ont été étudiées par TPO/TPD et spectroscopie infrarouge. Les impuretés provenant soit des précurseurs soit de la contamination atmosphérique (carbonates) ont été identifiées et leur stabilité thermique a été étudiée en fonction de différents traitements thermiques. Une méthode thermique de purification est proposée afin d'obtenir des poudres de qualité suffisante pour les applications catalytiques.

Key words: exhaust catalysts -- CeO 2-ZrO 2 mixed oxides -- cleaning procedure -- TPD-MS and TPO-MS experiments -- FTIR Spectroscopy characterisation

© EDP Sciences 1998

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