The present disclosure relates to a substrate comprising nanomaterials for treatment of gases, washcoats for use in preparing such a substrate, and methods of preparation of the nanomaterials and the substrate comprising the nanomaterials. More specifically, the present disclosure relates to a subst
The present disclosure relates to a substrate comprising nanomaterials for treatment of gases, washcoats for use in preparing such a substrate, and methods of preparation of the nanomaterials and the substrate comprising the nanomaterials. More specifically, the present disclosure relates to a substrate comprising nanomaterial for three-way catalytic converters for treatment of exhaust gases.
대표청구항▼
1. A method of forming a coated substrate, the method comprising: a) coating a substrate with a washcoat composition comprising oxidative catalytically active particles; wherein the oxidative catalytically active particles comprise oxidative composite nanoparticles bonded to micron-sized carrier par
1. A method of forming a coated substrate, the method comprising: a) coating a substrate with a washcoat composition comprising oxidative catalytically active particles; wherein the oxidative catalytically active particles comprise oxidative composite nanoparticles bonded to micron-sized carrier particles where the micron-sized carrier particles comprise metal oxide, and the oxidative composite nanoparticles comprise a first support nanoparticle comprising metal oxide and one or more oxidative catalyst nanoparticles comprising a first platinum group metal; andb) coating the substrate with a washcoat composition comprising reductive catalytically active particles; wherein the reductive catalytically active particles comprise reductive composite nanoparticles bonded to micron-sized carrier particles where the micron-sized carrier particles comprise metal oxide, and the reductive composite nanoparticles comprise a second support nanoparticle comprising metal oxide and one or more reductive catalyst nanoparticles comprising a second platinum group metal. 2. The method of claim 1, wherein the oxidative catalyst nanoparticles comprise palladium. 3. The method of claim 1, wherein the oxidative catalyst nanoparticles comprise platinum. 4. The method of claim 1, wherein the oxidative catalyst nanoparticles comprise a mixture of platinum and palladium. 5. The method of claim 1, wherein the first support nanoparticle comprises aluminum oxide. 6. The method of claim 1, wherein the micron-sized carrier particles of the oxidative catalytically active particles comprise aluminum oxide. 7. The method of claim 1, wherein the reductive catalyst nanoparticles comprise rhodium. 8. The method of claim 1, wherein the micron-sized carrier particles of the reductive catalytically active particles comprise cerium zirconium oxide. 9. The method of claim 1, wherein either or both washcoat layers further comprise an oxygen storage component. 10. The method of claim 9, wherein the oxygen storage component comprises cerium zirconium oxide or cerium oxide. 11. The method of claim 1, further comprising drying and calcining the substrate after each coating. 12. The method of claim 1, wherein the washcoat layers further comprise boehmite. 13. A method of forming a coated substrate, the method comprising: a) coating a substrate with a washcoat composition comprising oxidative catalytically active particles and reductive catalytically active particles;wherein the oxidative catalytically active particles comprise oxidative composite nanoparticles bonded to micron-sized carrier particles where the micron-sized carrier particles comprise metal oxide, and the oxidative composite nanoparticles comprise a first support nanoparticle comprising metal oxide and one or more oxidative catalyst nanoparticles comprising a first platinum group metal; andthe reductive catalytically active particles comprise reductive composite nanoparticles bonded to micron-sized carrier particles where the micron-sized carrier particles comprise metal oxide, and the reductive composite nanoparticles comprise a second support nanoparticle comprising metal oxide and one or more reductive catalyst nanoparticles comprising a second platinum group metal. 14. The method of claim 13, wherein the oxidative catalyst nanoparticles comprise palladium. 15. The method of claim 13, wherein the oxidative catalyst nanoparticles comprise platinum. 16. The method of claim 13, wherein the oxidative catalyst nanoparticles comprise a mixture of platinum and palladium. 17. The method of claim 13, wherein the first support nanoparticle comprises aluminum oxide. 18. The method of claim 13, wherein the micron-sized carrier particles of the oxidative catalytically active particles comprise aluminum oxide. 19. The method of claim 13, wherein the reductive catalyst nanoparticles comprise rhodium. 20. The method of claim 13, wherein the micron-sized carrier particles of the reductive catalytically active particles comprise cerium zirconium oxide. 21. The method of claim 13, wherein the washcoat layer further comprises an oxygen storage component. 22. The method of claim 21, wherein the oxygen storage component comprises cerium zirconium oxide or cerium oxide. 23. The method of claim 13, further comprising drying and calcining the substrate after the coating. 24. The method of claim 13, wherein the washcoat layer further comprises boehmite.
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