Process for making cerium and zirconium containing compositions using mesitylene and composition made by same
AssigneeNeo Performance Materials (Singapore) Pte. Ltd.
InventorsBarry Huang, Steffi Tan, Szu Hwee Ng
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Abstract
Disclosed herein are catalyst compositions having improved mercury intrusion volume and surface areas and processes for making these compositions. The enhanced compositions disclosed herein contain zirconium, cerium, optionally yttrium, and optionally one or more rare earths other than cerium and yttrium. Further disclosed are processes of producing these compositions involving supercritical drying after addition of mesitylene. The compositions can be used as a catalyst and/or as part of a catalyst system in an automobile exhaust system.
Claims11
A process of producing a composition comprising zirconium, cerium, optionally yttrium, and optionally one or more rare earths other than cerium and yttrium, comprising the steps of:
- (a) mixing Zr and Ce solutions, optional yttrium solution, and optional solutions of one or more rare earth other than cerium and yttrium to provide a mixture;
- (b) adding the mixture to a basic solution to form a precipitate;
- (c) dewatering the precipitate;
- (d) adding mesitylene to the precipitate, wherein the mesitylene is added in an amount of approximately 50-100% by weight with respect to total oxide content equivalent in the precipitate;
- (e) supercritically drying the precipitate;
- and
- (f) calcining the precipitate to provide a composition comprising zirconium, cerium, optionally yttrium and optionally one or more rare earths other than cerium and yttrium.
Dependencies are inferred from the claim text.