Engine aftertreatment system
US-11905873-B1 · Feb 20, 2024 · US
Exhaust gas catalyst, method for the production of carrier, method for the production of exhaust gas catalyst, and apparatus for treating exhaust gas
US9617886B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9617886-B2 |
| Application number | US-201214009577-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 23, 2012 |
| Priority date | Apr 4, 2011 |
| Publication date | Apr 11, 2017 |
| Grant date | Apr 11, 2017 |
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- Title
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Abstract
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An exhaust gas controlling catalyst includes zirconia particles; ceria particles which contact the zirconia particles, of which a mean particle size is smaller than a mean particle size of the zirconia particles; and an active metal that is supported on at least the ceria particles in a dispersed manner.
First claim
Opening claim text (preview).
What is claimed is: 1. An exhaust gas controlling catalyst, comprising: zirconia particles; ceria particles which contact the zirconia particles, of which a mean particle size is smaller than a mean particle size of the zirconia particles; and an active metal that is supported on at least the ceria particles in a dispersed manner, wherein the active metal is Cu, wherein a mean particle size of the ceria particles is 1 to 9 nm, wherein a percentage of the ceria particles to the zirconia particles is 5 to 30% by weight, and a mean particle size of the zirconia particles is 5 to 30 nm. 2. An exhaust gas control apparatus, comprising: a first-stage base metal catalyst system that oxidizes HC and CO to harmless components, of which a conversion efficiency for HC is higher than a conversion efficiency for CO; and a second-stage base metal catalyst system that has the exhaust gas controlling catalyst according to claim 1 and reduces NOx to harmless components. 3. The exhaust gas controlling catalyst according to claim 1 , wherein the ceria particles are supported on the surface of the zirconia particles in a dispersed manner. 4. An exhaust gas control apparatus according to claim 2 , wherein the first-stage base metal catalyst system is a Fe/Al 2 O 3 catalyst.
Assignees
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Classifications
Nanoparticles · CPC title
of rare earths · CPC title
Cerium · CPC title
Precipitation on carriers · CPC title
Zirconium · CPC title
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Frequently asked questions
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- What does patent US9617886B2 cover?
- An exhaust gas controlling catalyst includes zirconia particles; ceria particles which contact the zirconia particles, of which a mean particle size is smaller than a mean particle size of the zirconia particles; and an active metal that is supported on at least the ceria particles in a dispersed manner.
- Who is the assignee on this patent?
- Watanabe Masao, Takagi Shigeharu, Morikawa Akira, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification F01N3/20. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Apr 11 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).