Method for determining the low pressure exhaust gas recirculation mass flow in the air system of an internal combustion engine
US-9228508-B2 · Jan 5, 2016 · US
Exhaust system having N2O catalyst in EGR circuit
US9587591B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9587591-B2 |
| Application number | US-201514633324-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 27, 2015 |
| Priority date | Feb 27, 2014 |
| Publication date | Mar 7, 2017 |
| Grant date | Mar 7, 2017 |
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Abstract
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An exhaust system for an internal combustion engine is disclosed. The exhaust system comprises a particulate filter, one or more NO x reduction catalysts, and a low pressure exhaust gas recirculation (EGR) circuit for connecting the exhaust system downstream of the filter and the one or more NO x reduction catalysts to an intake of the engine. The EGR circuit comprises a N 2 O-producing catalyst.
First claim
Opening claim text (preview).
We claim: 1. An exhaust system for an internal combustion engine, the system comprising a particulate filter, one or more NO x reduction catalysts, and a low pressure exhaust gas recirculation (EGR) circuit for connecting the exhaust system downstream of the filter and the one or more NO x reduction catalysts to an intake of the engine, wherein the EGR circuit comprises a N 2 O-producing catalyst, and wherein the N 2 O-producing catalyst comprises manganese supported on an inorganic oxide. 2. The exhaust system of claim 1 , wherein one or more NO x reduction catalysts is located on the filter. 3. The exhaust system of claim 1 , wherein the one or more NO x reduction catalysts are a selective catalytic reduction catalyst. 4. The exhaust system of claim 3 , wherein the selective catalytic reduction catalyst comprises a transition metal and molecular sieve. 5. The exhaust system of claim 3 , further comprising a means for introducing a nitrogenous reductant into the exhaust system upstream of the selective catalytic reduction catalyst. 6. The exhaust system of claim 5 , wherein the nitrogenous reductant is ammonia, hydrazine or an ammonia precursor selected from the group consisting of urea ((NH 2 ) 2 CO), ammonium carbonate, ammonium carbamate, ammonium hydrogen carbonate and ammonium formate. 7. The exhaust system of claim 1 , wherein the one or more NO x reduction catalysts is a lean NO x trap. 8. The exhaust system of claim 1 , wherein the N 2 O-producing catalyst is located in or on a flow-through monolith substrate. 9. The exhaust system of claim 1 , further comprising a NO oxidation catalyst located upstream of the particulate filter. 10. The exhaust system of claim 1 further comprising an ammonia oxidation catalyst disposed downstream of the one or more NO x reduction catalysts and upstream of the EGR, relative to the direction of exhaust gas flow through the system. 11. The exhaust system of claim 10 , wherein the NO x reduction catalyst and the ammonia oxidation catalyst are loaded onto the same substrate, wherein the front is loaded with the NO x reduction catalyst and the rear is loaded with the ammonia oxidation catalyst.
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Zeolites · CPC title
Barium · CPC title
Beta zeolites · CPC title
Auxiliary oxidation catalysts · CPC title
Cerium · CPC title
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- What does patent US9587591B2 cover?
- An exhaust system for an internal combustion engine is disclosed. The exhaust system comprises a particulate filter, one or more NO x reduction catalysts, and a low pressure exhaust gas recirculation (EGR) circuit for connecting the exhaust system downstream of the filter and the one or more NO x reduction catalysts to an intake of the engine. The EGR circuit comprises a N 2 O-producing catal…
- Who is the assignee on this patent?
- Johnson Matthey Plc
- What technology area does this patent fall under?
- Primary CPC classification F02M25/0717. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Mar 07 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 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).