Composition based on zirconium oxide and cerium oxide, preparation method therefor and use thereof
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United States of America Patent
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Apr 10, 2001
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N/A
app pub date -
May 8, 1998
filing date -
Jul 3, 1995
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Abstract
The invention relates to a composition based on zirconium oxide and comprising cerium oxide which has a specific surface of at least 30 m.sup.2 /g after calcination for 6 hours at 900.degree. C. and which is provided in the form of a pure solid solution of cerium oxide in zirconium oxide. According to another embodiment, this composition can additionally comprise a doping element and can exhibit a specific surface of at least 25 m.sup.2 g after calcination for 6 hours at 1000.degree. C. A process for the preparation of these compositions comprises the following stages: a mixture is prepared, in liquid medium, containing a zirconium compound and a cerium(IV) compound; the said mixture is heated at a temperature greater than 100.degree. C.; the reaction mixture obtained on conclusion of the heating is brought to a basic pH; the precipitate thus obtained is recovered; the said precipitate is calcined; the doping element being, if appropriate, added either to the starting mixture in liquid medium or to the reaction mixture obtained on conclusion of the heating.
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