Invention Grant
- Patent Title: Composition based on cerium oxide and on zirconium oxide having a high reducibility and high specific surface, methods for the preparation thereof and use as a catalyst
- Patent Title (中): 基于氧化铈和具有高还原性和高比表面积的氧化锆的组合物，其制备方法和用作催化剂
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Application No.: US10568853Application Date: 2004-09-02
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Publication No.: US07939040B2Publication Date: 2011-05-10
- Inventor: Olivier Larcher , Emmanuel Rohart
- Applicant: Olivier Larcher , Emmanuel Rohart
- Applicant Address: FR Aubervilliers
- Assignee: Rhodia Operations
- Current Assignee: Rhodia Operations
- Current Assignee Address: FR Aubervilliers
- Agency: Buchanan, Ingersoll & Rooney, P.C.
- Priority: FR0310471 20030904
- International Application: PCT/FR2004/002237 WO 20040902
- International Announcement: WO2005/023728 WO 20050317
- Main IPC: C01F17/00
- IPC: C01F17/00 ; C01G25/02 ; C01G28/00 ; C01G30/00 ; C01B21/00 ; C01B23/00 ; C01B25/00 ; C01B31/00 ; C01B33/00 ; C01B35/00 ; B01D53/56 ; B01D53/94 ; B01J8/02 ; B01J23/00 ; B01J23/10 ; B01J21/04 ; B01J23/02
Abstract:
The inventive composition is based on cerium oxide and on zirconium oxide in an atomic proportion Ce/Zr of at least 1, and has a reducibility rate of at least 70% and a surface area of at least 15 m; 2; /g. This composition is obtained by a method in which: a mixture is made containing cerium and zirconium compounds; this mixture is provided with a basic compound whereby obtaining a precipitate that is heated in an aqueous medium; a surfactant-type additive or a polyethylene glycol or a carboxylic acid is added to this medium or to the separated precipitate; the mixture is ground; the precipitate obtained thereof is calcined under inert gas or vacuum, in a first period of time, at a temperature of at least 850° C. and then under an oxidizing atmosphere, in a second period of time, at a temperature of at least 400° C.
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