C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
C01G 25/00 (2006.01) B01J 23/10 (2006.01) C01B 13/14 (2006.01) C01F 7/00 (2006.01) C01G 25/02 (2006.01)
Patent
CA 2268830
Mixed oxides of cerium and zirconium as well as solid solutions and cerium oxides are produced having improved thermal stability. The process involves the formation of cerium and zirconium oxides, mixed oxides and solid solutions by methods such as co-thermohydrolysis and co-precipitation, followed by washing or impregnating with an alkoxylated compound having greater than (2) carbon atoms. After the washing or impregnating step, the mixture is calcined to form oxides having very high surface area and oxygen storage capacity. The improved thermal stability of the oxides makes them advantageous for use in applications such as catalytic converters.
On a produit des oxydes mélangés de cérium et de zirconium ainsi que des solutions solides et des oxydes de cérium présentant une meilleure stabilité thermique. Le processus consiste en la formation d'oxydes de cérium et de zirconium, d'oxydes mélangés et de solutions solides par des procédés tels que la co-thermohydrolyse et la co-précipitation, suivis d'un lavage ou d'une imprégnation avec un composé alcoxylé présentant plus de deux atomes de carbone. Après l'étape de lavage ou d'imprégnation, le mélange est calciné pour former des oxydes présentant une très grande aire de surface et une très grande capacité de stockage d'oxygène. La stabilité thermique améliorée des oxydes les rend avantageux pour une utilisation dans des applications telles que des pots catalytiques.
Gowling Lafleur Henderson Llp
Rhodia Electronics And Catalysis Inc.
Rhodia Inc.
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