Composition based on zirconium oxide and oxides of cerium, lanthanum and of another rare earth, a method for preparing same and use thereof as catalyst
CA 2489772 C · Owner: Rhodia Electronics And Catalysis · Inventors: Hedouin, Catherine
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a composition based on zirconium and cerium oxides in an atomic ratio Zr/Ce > 1 and further comprising lanthanum oxide or an oxide of a rare earth other than cerium and lanthanum. The invention is characterized in that after calcination for 6 hours at 1150 ·C it has a specific surface area of not less than 10 m?2¿/g. The composition is obtained by forming a mixture containing a sol of a zirconium compound and cerium lanthanum, said rare earth compounds, contacting said mixture with a basic compound solution while heating and calcining the resulting precipitate. The composition can be used as catalyst.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 26, 2003 and granted May 29, 2018. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 26, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 2025.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.