IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0408411
(2009-03-20)
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등록번호 |
US-8778831
(2014-07-15)
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발명자
/ 주소 |
- Southward, Barry W. L.
- Ellis, Curt
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출원인 / 주소 |
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대리인 / 주소 |
Smith, Gambrell & Russell, LLP
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인용정보 |
피인용 횟수 :
4 인용 특허 :
25 |
초록
▼
There is described a base metal modified Cerium containing oxide materials and their application as catalysts for the oxidation of CO and HC emissions from a compression ignition/diesel engine. These materials provide effective promotion of CO and HC oxidation function in the presence or absence of
There is described a base metal modified Cerium containing oxide materials and their application as catalysts for the oxidation of CO and HC emissions from a compression ignition/diesel engine. These materials provide effective promotion of CO and HC oxidation function in the presence or absence of PGM and are based upon OIC/OS materials having a stable cubic crystal structure, and most especially to promoted OIC/OS materials wherein the promotion is achieved by the post-synthetic introduction of non-precious metals via a basic (alkaline) exchange process.
대표청구항
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1. An oxidation catalyst, comprising: a primary catalytic component comprising a metal selected from the group consisting of platinum, palladium, iridium, rhodium, ruthenium, alloys thereof, and combinations thereof, disposed on a first support,a secondary catalytic component comprising a solid solu
1. An oxidation catalyst, comprising: a primary catalytic component comprising a metal selected from the group consisting of platinum, palladium, iridium, rhodium, ruthenium, alloys thereof, and combinations thereof, disposed on a first support,a secondary catalytic component comprising a solid solution having a cubic fluorite structure, said solid solution comprises a post-synthetic base metal ion-exchanged cerium oxide having a greater concentration of a base metal at its surface than incorporated within its cubic fluorite structure. 2. The oxidation catalyst of claim 1, wherein the solid solution further comprises zirconium oxide. 3. The oxidation catalyst of claim 1, wherein the solid solution is a substantially phase pure solid solution (as determined by conventional X-ray Diffraction method) with oxygen ion conducting properties and comprises a. up to about 95 wt % zirconiumb. up to about 95 wt % ceriumc. up to about 20 wt % of a stabiliser selected from the group consisting of rare earth metals, yttrium, and mixtures thereof. 4. The oxidation catalyst of claim 1, wherein the solid solution is further doped with one or more dopant base metal species selected from the group consisting of a transition metal, an alkali metal, an alkaline earth metal, and group Mb metal. 5. The oxidation catalyst of claim 4, wherein the concentration of base metal species is about 0.01 wt % to about 10 wt %-of the cerium oxide phase. 6. The oxidation catalyst of claim 1, wherein the concentration of base metal species is 0.1 wt % to about 2.5 wt % of the cerium oxide phase. 7. The oxidation catalyst of claim 1, wherein the secondary catalytic component is applied in the same layer/pass as the primary catalytic component. 8. The oxidation catalyst of claim 1, wherein the secondary catalytic component is applied in a subsequent layer/pass to the primary catalytic component. 9. The oxidation catalyst of claim 1, wherein the secondary catalytic component is applied in a layer/pass prior to the primary catalytic component. 10. The oxidation catalyst of claim 1, wherein the base metal modified Cerium containing oxide is applied in a zone, wherein the zone is positioned at the outlet of the oxidation catalyst. 11. The oxidation catalyst of claim 1, wherein the secondary catalytic component is applied in a zone, wherein the zone is positioned at the inlet of the oxidation catalyst. 12. The oxidation catalyst of claim 1, wherein the secondary catalytic component is employed in a separate second monolithic brick situated downstream of the oxidation catalyst. 13. The oxidation catalyst of claim 1, wherein the secondary catalytic component undergoes facile and complete regeneration of CO oxidation function, which may have been poisoned due to accumulation of SOx-derived poisons, during the typical high temperature thermal excursions associated with operation of the vehicle are in highway driving or DPF regeneration cycles. 14. The oxidation catalyst of claim 1, wherein the base metal was provided as an ammoniacal complex. 15. The oxidation catalyst of claim 1, wherein the base metal was provided as an organic amine complex. 16. The oxidation catalyst of claim 1, wherein the base metal was provided as a hydroxide compound. 17. The oxidation catalyst of claim 1, wherein the base metal has a high level of dispersion such that phase analysis by conventional X-Ray diffraction methods shows that the secondary catalytic component exhibits a cubic fluorite structure of greater than 95%, a bulk metal oxide dopant phase of less than 5%, and a dopant metal oxide particle size, as determined by line-broadening/Scherrer equation method, of about 30 Å to about 100 Å. 18. The oxidation catalyst of claim 1, wherein the base metal has a high level of dispersion such that phase analysis by XRD shows that the secondary catalytic component maintains a cubic fluorite structure of at least 95% after hydrothermal oxidising aging at 1000° C. 19. The oxidation catalyst of claim 1, wherein the secondary catalytic component displays significant promotion of Oxygen Ion Conductivity at low temperature, as determined by conventional Temperature Programmed Reduction (TPR) methods, as compared to non-promoted OS materials. 20. The oxidation catalyst of claim 1, wherein the secondary catalytic component, as determined by TPR, displays high hydrothermal durability at temperatures appropriate for its application as a Diesel Oxidation Catalyst (DOC) at temperatures up to 1000° C. in the presence of steam, as compared to non-promoted OS materials. 21. A catalytic device, comprising: a housing disposed around a substrate;a compression ignition oxidation catalyst disposed on the substrate, the compression ignition oxidation catalyst comprising a primary catalytic metal selected from the group consisting of platinum, palladium, iridium, rhodium, ruthenium, alloys thereof, and mixtures thereof, and a secondary catalytic component comprising a solid solution having a cubic fluorite structure, said solid solution comprises cerium oxide and its surface having been ion-exchanged with a base metal. 22. The catalytic device of the claim 17, further comprising a retention material disposed between the housing and the substrate. 23. The oxidation catalyst of claim 1, wherein the secondary catalytic component further comprises a zeolite.
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