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US 6,204,219 B1Granted
Thermally stable support material and method for making the same
AssigneeW. R. Grace & Co.-Conn.
InventorsRasto Brezny, Manoj M. Koranne
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Abstract
A process for the preparation of mixed oxide compositions of cerium oxide and at least one non-noble metal oxide is disclosed. The process involves contacting a salt solution containing a cerium (IV) salt with hydrogen peroxide and thereafter, treating the resulting solution with excess base to precipitate a mixed oxides. Mixed oxide compositions produced by the process maintain a high specific surface area after prolonged exposure to high temperatures.
Claims17
A process for preparing a mixed metal oxide of cerium oxide and at least one other non-noble metal oxide, the process comprising:
- preparing a homogeneous, aqueous solution of a cerium IV salt and at least one non-noble metal salt;
- contacting the salt solution with an aqueous hydrogen peroxide solution in an amount of at least about 2.5 moles per molar equivalent of cerium;
- treating the peroxide-treated solution with an excess of a base to precipitate a cerium hydroxide and at least one non-noble metal hydroxide;
- washing and drying the precipitate;
- and
- calcining the precipitate at a temperature sufficient to form a mixed metal oxide of cerium oxide and at least one non-noble metal oxide, wherein the mixed metal oxide is in the form of particles and the particles have a specific surface area of at least 30 m2/g after heat treatment at 900° C. for 4 hours.
3 more elements
Dependencies are inferred from the claim text.