Oxidation catalyst for treating the exhaust gas of a compression ignition engine
US-9527034-B2 · Dec 27, 2016 · US
Oxidation Catalyst for a Compression Ignition Engine
US2016167022A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016167022-A1 |
| Application number | US-201414370175-A |
| Country | US |
| Kind code | A1 |
| Filing date | May 16, 2014 |
| Priority date | May 17, 2013 |
| Publication date | Jun 16, 2016 |
| Grant date | — |
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Abstract
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An oxidation catalyst for treating an exhaust gas from a compression ignition engine, which oxidation catalyst comprises: a substrate; a first washcoat region comprising palladium (Pd) and a first support material comprising cerium oxide; and a second washcoat region comprising platinum (Pt) and a second support material.
First claim
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1 .- 15 . (canceled) 16 . An oxidation catalyst for treating an exhaust gas from a compression ignition engine, which oxidation catalyst comprises: a substrate; a first washcoat region comprising palladium (Pd) and a first support material comprising cerium oxide; and a second washcoat region comprising platinum (Pt) and a second support material. 17 . An oxidation catalyst according to claim 16 , wherein the second washcoat region further comprises palladium (Pd). 18 . An oxidation catalyst according to claim 17 , wherein the mass of platinum (Pt) is greater than the mass of palladium (Pd) in the second washcoat region. 19 . An oxidation catalyst according to claim 16 , wherein the second support material comprises a refractory metal oxide. 20 . An oxidation catalyst according to claim 19 , wherein the refractory metal oxide is selected from the group consisting of alumina, silica, titania, zirconia, ceria and mixed or composite oxides of two or more thereof. 21 . An oxidation catalyst according to claim 20 , wherein the refractory metal oxide is alumina. 22 . An oxidation catalyst according to claim 16 , wherein the first washcoat region comprises an amount of palladium (Pd) of less than 2% by weight. 23 . An oxidation catalyst according to claim 22 , wherein the first washcoat region comprises an amount of palladium (Pd) of 0.25 to 1.9% by weight. 24 . An oxidation catalyst according to claim 16 , wherein the first washcoat region is a first washcoat zone and the second washcoat region is a second washcoat zone, and wherein the second washcoat zone is disposed or supported on the substrate downstream of the first washcoat zone. 25 . An oxidation catalyst according to claim 16 , wherein the first washcoat region is a first washcoat layer and the second washcoat region is a second washcoat layer, and wherein the first washcoat layer is disposed or supported on the second washcoat layer. 26 . An oxidation catalyst according to claim 16 , wherein the second washcoat region comprises an amount of platinum (Pt) of 0.2 to 15% by weight. 27 . An exhaust system comprising an oxidation catalyst according to claim 16 , and an emissions control device. 28 . A method of modulating the content of NOx in an exhaust gas from a compression ignition engine for an emissions control device, which method comprises: (a) controlling the NOx content of an exhaust gas by contacting the exhaust gas with an oxidation catalyst according to claim 16 to produce a treated exhaust gas; and (b) passing the treated exhaust gas to an emissions control device.
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- What does patent US2016167022A1 cover?
- An oxidation catalyst for treating an exhaust gas from a compression ignition engine, which oxidation catalyst comprises: a substrate; a first washcoat region comprising palladium (Pd) and a first support material comprising cerium oxide; and a second washcoat region comprising platinum (Pt) and a second support material.
- Who is the assignee on this patent?
- Johnson Matthey Plc
- What technology area does this patent fall under?
- Primary CPC classification B01J23/42. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Thu Jun 16 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).