B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 35/10 (2006.01) C01G 25/02 (2006.01) B01J 23/63 (2006.01) B01J 37/03 (2006.01) B01J 37/06 (2006.01)
Patent
CA 2642237
The invention concerns a composition based on zirconium oxide in a weight proportion of at least 25%, and comprising between 15% and 60% of cerium oxide, between 10% and 25% of yttrium oxide, between 2% and 10% of lanthanum oxide and between 2% and 15% of another rare earth oxide. Additionally, it has, after calcination for 10 hours at 1150°C, a specific surface of at least 15 m2/g as well as a cubic phase. It is obtained by forming a mixture comprising zirconium, cerium, yttrium, lanthanum and the additional rare earth, by precipitating said mixture with a base, heating in aqueous medium said precipitate, adding thereto a surfactant and calcining the precipitate. Said composition can be used as catalyst.
La composition de l'invention est à base d'oxyde de zirconium dans une proportion massique d'au moins 25 %, et elle comprend entre 15 % et 60 % d'oxyde de cérium, entre 10 % et 25 % d'oxyde d'yttrium, entre 2 % et 10 % d'oxyde de lanthane et entre 2 % et 15 % d'oxyde d'une autre terre rare; elle, présente en outre, après calcination 10 heures à 1150 °C, une surface spécifique d'au moins 15 m2/g ainsi qu'une phase cubique. Elle est obtenue en formant un mélange comprenant des composés du zirconium, du cérium, de l'yttrium, du lanthane et de la terre rare supplémentaire; en précipitant ce mélange avec une base; en chauffant en milieu aqueux ledit précipité; en y ajoutant un tensioactif et en calcinant le précipité. Cette composition peut être utilisée comme catalyseur.
Huang Aimin
Larcher Olivier
Rohart Emmanuel
Verdier Stephan
Rhodia Operations
Robic
LandOfFree
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