Catalytic article comprising combined PGM and OSC
The present disclosure provides catalytic materials and catalytic articles formed therewith. The catalytic materials particularly can include an oxygen storage component comprising a solid solution of at least one platinum group metal and at least one rare earth metal oxide. In one or more embodiments, catalytic materials can include a solid solution of a platinum group metal (e.g., palladium) and a mixed metal oxide (e.g., ceria/zirconia).
1. A composite material comprising (i) a solid solution comprising a co-precipitate of at least one platinum group metal and at least one rare-earth metal oxide, and zirconia; and (ii) a support material supporting the solid solution,
wherein the platinum group metal is palladium,
wherein the rare-earth metal oxide comprises ceria,
wherein the support material comprises an alumina, and
wherein the solid solution is impregnated on the support material.
2. The composite material of claim 1 , wherein the composite material further comprises one or more oxides of Lanthanum, Yttrium, Neodymium, Gadolinium, and Praseodymium.
3. The composite material of claim 1 , wherein the composite material further comprises one or more oxides of Niobium, Iron, Nickel, Silver, Cobalt, Manganese, Copper, and Tungsten.
4. The composite material of claim 1 , wherein the support material comprises an oxygen storage component.
5. The composite material of claim 1 , wherein the composite material includes at least one further platinum group metal that is not part of the solid solution.
6. The composite material of claim 1 , wherein the composite material includes at least one further rare-earth metal oxide that is not part of the solid solution.
7. A three-way catalyst composition comprising an oxygen storage component including the composite material according to claim 1 .
8. A method of preparing a composite material according to claim 1 , the method comprising combining a compound of a platinum group metal with a compound of a rare-earth metal and zirconia to form a liquid solution, co-precipitating the platinum group metal, rare-earth metal and zirconium nitrate from the liquid solution to form a solid solution of the platinum group metal, the rare-earth metal, and co-precipitating or impregnating the solid solution on a support material,
wherein the platinum group metal is palladium,
wherein the rare-earth metal oxide comprises ceria, and
wherein the support material comprises an alumina.
9. The method of claim 8 , wherein the co-precipitating comprises adding an alkalinizing material in an amount sufficient to raise the pH of the liquid solution to about 8 or greater.
10. The method of claim 8 , comprising washing and filtering the solid solution of the platinum group metal, the rare-earth metal and zirconium nitrate to form a filter cake.
11. The method of claim 10 , comprising calcining the filter cake at a temperature of about 300° C. or greater for a time of about 10 minutes or greater.