US20100300078A1 - Exhaust After Treatment System - Google Patents
Exhaust After Treatment System Download PDFInfo
- Publication number
- US20100300078A1 US20100300078A1 US12/472,832 US47283209A US2010300078A1 US 20100300078 A1 US20100300078 A1 US 20100300078A1 US 47283209 A US47283209 A US 47283209A US 2010300078 A1 US2010300078 A1 US 2010300078A1
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- Prior art keywords
- exhaust gas
- exhaust
- treatment system
- passages
- catalyst composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/2073—Selective catalytic reduction [SCR] with means for generating a reducing substance from the exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2825—Ceramics
- F01N3/2828—Ceramic multi-channel monoliths, e.g. honeycombs
Definitions
- Exemplary embodiments of the present invention are related to exhaust treatment systems for internal combustion engines.
- Diesel engine exhaust gas is a heterogeneous mixture which contains gaseous emissions such as carbon monoxide (“CO”), unburned hydrocarbons (“HC”) and NO x , as well as condensed phase materials (liquids and solids) that constitute particulate matter.
- Catalyst compositions, and substrates on which the catalysts are disposed may be provided in a diesel engine exhaust system to convert certain, or all of these exhaust constituents into non-regulated components.
- Diesel exhaust emission treatment systems may include one or more of a precious metal containing diesel oxidation catalyst (“DOC”), a diesel particulate trap or filter “(DPF”), and a Selective Catalytic Reduction (“SCR”) catalyst device for the reduction of NO x .
- DOC precious metal containing diesel oxidation catalyst
- DPF diesel particulate trap or filter
- SCR Selective Catalytic Reduction
- DPF exhaust treatment technology in use for high particulate matter reduction
- filter structures that have displayed effectiveness in removing the particulate matter from diesel exhaust gas
- Ceramic wall flow filters have experienced significant acceptance in automotive applications.
- the filter is a physical structure for removing particulates from exhaust gas and, as such, accumulating particulates will have the effect of increasing the exhaust system backpressure experienced by the engine.
- the DPF is periodically cleaned, or regenerated.
- the DPF may include an SCR catalyst which, with the assistance of upstream injected ammonia (NH 3 ) in the form of gas, liquid or contained in a urea solution, will convert the NO x to nitrogen (“N 2 ”).
- NH 3 upstream injected ammonia
- One method of generating the temperatures required in the exhaust system for regeneration of the DPF is to deliver excess HC to an oxidation catalyst disposed upstream of the DPF.
- HC is oxidized, resulting in an exothermic reaction that raises the exhaust gas temperature to levels required for DPF regeneration thereby burning or oxidizing the trapped particulate matter and cleaning the trap.
- HC is a regulated exhaust gas constituent
- release to the atmosphere should be avoided in order to meet applicable regulations.
- the quantity of ammonia injected into the exhaust gas stream should be limited to that required for complete NO x conversion. However circumstances may occur in which some ammonia is not consumed by the SCR catalyst activity and passes through the DPF. The release of unconverted ammonia is undesirable.
- an exhaust gas treatment system for reducing constituents in the exhaust gas of an internal combustion engine.
- a ceramic monolith is disposed within the exhaust gas treatment system and has exhaust flow passages extending therethrough that are defined by longitudinally extending walls therebetween.
- a first catalyst composition for catalytic reduction of oxides of nitrogen in the exhaust gas is applied to a first portion of the exhaust flow passages.
- a second catalyst composition for catalytic oxidation of hydrocarbons, carbon monoxide and ammonia in the exhaust gas is separately applied, serially downstream to a second portion of the exhaust flow passages.
- the second catalytic composition is configured to reduce hydrocarbon, carbon monoxide and ammonia slip past the exhaust treatment system.
- an exhaust gas treatment system for reducing constituents in the exhaust gas of an internal combustion engine comprises a ceramic wall flow monolith filter disposed within the exhaust gas treatment system having exhaust flow passages extending therethrough that are defined by longitudinally extending walls therebetween.
- a first subset of exhaust flow passages have open inlets and closed outlets to define inlet passages.
- As second subset of exhaust flow passages have closed inlets and open outlets to define outlet passages.
- Exhaust gas enters the ceramic wall flow monolith filter through the inlet passages and migrates through, as is filtered by the longitudinally extending walls to exit the filter through the outlet passages.
- a first catalyst composition that is operable, with an ammonia reductant, top catalytically reduce oxides of nitrogen in the exhaust gas is applied to a first portion of the ceramic wall flow monolith filter.
- a second catalyst composition for catalytic oxidation of hydrocarbon, carbon monoxide and ammonia in the exhaust gas is separately applied, serially downstream to a second portion of the ceramic wall flow monolith filter.
- an exhaust gas treatment system for reducing constituents in the exhaust gas of and internal combustion engine include an oxidation catalyst and a particulate filter downstream of the oxidation catalyst for removal of particulates from the exhaust gas.
- a first catalyst composition, operable to catalytically reduce oxides of nitrogen in the exhaust gas is applied to a first portion of the particulate filter and a second catalyst composition for catalytic oxidation of hydrocarbon, carbon monoxide and ammonia in the exhaust gas is applied serially downstream to a second portion of the particulate filter.
- FIG. 1 is a schematic view of an exhaust treatment system for an internal combustion engine
- FIG. 2 is an axial, sectional view that schematically illustrates a portion of a ceramic monolith embodied in the exhaust treatment system of FIG. 1 .
- an exemplary embodiment of the invention is directed to an exhaust gas treatment system 10 for the reduction of regulated exhaust constituents of an internal combustion engine, such as diesel engine 12 .
- the exhaust gas treatment system 10 includes an exhaust conduit 14 that transports exhaust gas from the diesel engine 12 to the various exhaust treatment components of the exhaust gas treatment system.
- the exhaust treatment components may include a Diesel Oxidation Catalyst (“DOC”) 16 .
- the DOC may include a flow through ceramic monolith (not shown) that is has an oxidation catalyst disposed thereon.
- the oxidation catalyst may be applied as a wash coat and may contain precious group metals such as platinum (Pt), palladium (Pd), rhodium (Rh) or other suitable oxidizing catalysts, or combination thereof.
- the DOC 16 is useful in treating unburned gaseous and non-volatile HC and CO, which are combusted to form carbon dioxide and water.
- a reductant Downstream of the DOC 16 , a reductant may be injected into the exhaust gas 20 in the exhaust conduit 14 .
- NH 3 in the form of a gas, a liquid or an aqueous urea solution may be used as the reductant and may be mixed with air in the injector nozzle 18 to aid in the dispersion of the injected spray.
- the exhaust gas stream containing the added NH 3 passes through an SCR device, in this case a DPF having an SCR catalyst applied thereto.
- the DPF/SCR 22 is configured to filter the exhaust gas to remove carbon and other particulates and to reduce the NO x levels resident in the exhaust gas stream.
- the DPF/SCR 22 just described is typically referred to as a 2-way device as a result of its ability to treat or remove more than one exhaust component.
- the DPF/SCR 22 may be constructed with a ceramic wall flow monolith filter 23 , FIG. 2 , that has a plurality of longitudinally extending passages 24 defined by longitudinally extending walls 26 .
- the passages 24 include a subset of inlet passages 28 that have an open inlet end 30 and a closed outlet end 32 , and a subset of outlet passages 34 that have a closed inlet end 36 and an open outlet end 38 .
- Exhaust gas entering the DPF/SCR 22 through the inlet end 30 of the inlet passages 28 is forced to migrate through the associated longitudinally extending walls 26 to the outlet passages 34 . It is through this wall flow mechanism that the exhaust gas 20 is filtered of carbon and other particulates.
- the filtered particulates 40 are deposited on the longitudinally extending walls 26 of the inlet passages 28 and, over time, will have the effect of increasing the exhaust backpressure experienced by the diesel engine 12 .
- an SCR catalyst composition 42 preferably contains a zeolite and one or more base metal components such as iron (Fe), cobalt (Co), copper (Cu) or vanadium (V) which can operate efficiently to convert the NO x constituents in the exhaust gas 20 across the operating range of the DPF/SCR 22 .
- the SCR catalyst composition 42 may be applied to the longitudinally extending walls 26 of the inlet passages 28 , the outlet passages 34 , or both, of the ceramic wall flow monolith filter 23 . Due to the porous nature of the ceramic wall flow monolith filter 23 , the SCR catalyst may also be applied within the walls of the substrate to increase the contact time between the exhaust gas 20 and the SCR catalyst composition 42 .
- the DPF/SCR 22 operates as an effective particulate filter and SCR system that is useful for remediation of the NO x in the engine exhaust gas while at the same time removing particulate mater therefrom.
- the DPF/SCR 22 is periodically cleaned, or regenerated.
- Regeneration involves oxidation or burning of the accumulated particulate matter 40 in what is typically a high temperature (>600 C) environment.
- excess HC is delivered to the DOC 16 for oxidation therein.
- the exothermal reaction caused by the oxidation of the HC will raise the temperature of the exhaust gas 20 upstream of the DPF/SCR 22 to required regeneration levels thereby burning or oxidizing the trapped particulate matter and cleaning the trap.
- HC and CO are regulated exhaust gas constituents their release to the atmosphere should be minimized in order to meet applicable regulations.
- the quantity of NH 3 injected into the exhaust gas 20 should be limited to that required for complete NO x conversion. However circumstances may occur in which some NH 3 is not converted by the SCR catalyst activity and passes through the DPF/SCR 22 . The release of unconverted NH 3 is undesirable.
- an additional catalyst 44 containing precious group metals such as platinum (Pt), palladium (Pd), rhodium (Rh) or other suitable oxidizing catalyst or combination thereof is applied serially downstream of the SCR catalyst composition 42 , FIG. 2 , adjacent to the open outlet ends 38 of the outlet passages 34 of the DPF/SCR 22 .
- the additional catalyst 44 is applied separately to the DPF/SCR and is not layered over the SCR catalyst composition 42 .
- excess HC, CO and/or NH 3 enters or “slips” into the zone defined by the downstream catalyst 44 they are oxidized to non-regulated and desired elements.
- the HC, CO and/or NH 3 slips in the exhaust gas exiting the DPF/SCR 22 are treated, without the additional cost or complexity of a separate, stand-alone catalyst device downstream of the DPF/SCR 22 for HC, CO and NH 3 slip control.
Abstract
Description
- Exemplary embodiments of the present invention are related to exhaust treatment systems for internal combustion engines.
- Diesel engine exhaust gas is a heterogeneous mixture which contains gaseous emissions such as carbon monoxide (“CO”), unburned hydrocarbons (“HC”) and NOx, as well as condensed phase materials (liquids and solids) that constitute particulate matter. Catalyst compositions, and substrates on which the catalysts are disposed may be provided in a diesel engine exhaust system to convert certain, or all of these exhaust constituents into non-regulated components. Diesel exhaust emission treatment systems may include one or more of a precious metal containing diesel oxidation catalyst (“DOC”), a diesel particulate trap or filter “(DPF”), and a Selective Catalytic Reduction (“SCR”) catalyst device for the reduction of NOx.
- One exhaust treatment technology in use for high particulate matter reduction is the DPF. There are several known filter structures that have displayed effectiveness in removing the particulate matter from diesel exhaust gas such as ceramic honeycomb wall flow filters, wound or packed fiber filters, open cell foams, sintered metal fibers, etc. Ceramic wall flow filters have experienced significant acceptance in automotive applications. The filter is a physical structure for removing particulates from exhaust gas and, as such, accumulating particulates will have the effect of increasing the exhaust system backpressure experienced by the engine. To address backpressure increases caused by the accumulation of exhaust gas particulates, the DPF is periodically cleaned, or regenerated. Regeneration involves the burning of accumulated particulates in what is typically a high temperature (>600 C) environment that may result in an increase in the levels of NOx components in the exhaust gas stream. The DPF may include an SCR catalyst which, with the assistance of upstream injected ammonia (NH3) in the form of gas, liquid or contained in a urea solution, will convert the NOx to nitrogen (“N2”).
- One method of generating the temperatures required in the exhaust system for regeneration of the DPF is to deliver excess HC to an oxidation catalyst disposed upstream of the DPF. In the oxidation catalyst, HC is oxidized, resulting in an exothermic reaction that raises the exhaust gas temperature to levels required for DPF regeneration thereby burning or oxidizing the trapped particulate matter and cleaning the trap.
- During the regeneration event, some excess HC may pass through the oxidation catalyst to the DPF. Since HC is a regulated exhaust gas constituent, release to the atmosphere should be avoided in order to meet applicable regulations. Similarly, the quantity of ammonia injected into the exhaust gas stream should be limited to that required for complete NOx conversion. However circumstances may occur in which some ammonia is not consumed by the SCR catalyst activity and passes through the DPF. The release of unconverted ammonia is undesirable.
- Accordingly, it is desirable to provide an exhaust system configuration that will reduce the levels of unconverted HC, CO and NH3 in the exhaust gas stream resulting from the operation of the DPF.
- In an exemplary embodiment of the present invention, an exhaust gas treatment system for reducing constituents in the exhaust gas of an internal combustion engine is provided. A ceramic monolith is disposed within the exhaust gas treatment system and has exhaust flow passages extending therethrough that are defined by longitudinally extending walls therebetween. A first catalyst composition for catalytic reduction of oxides of nitrogen in the exhaust gas is applied to a first portion of the exhaust flow passages. A second catalyst composition for catalytic oxidation of hydrocarbons, carbon monoxide and ammonia in the exhaust gas is separately applied, serially downstream to a second portion of the exhaust flow passages. The second catalytic composition is configured to reduce hydrocarbon, carbon monoxide and ammonia slip past the exhaust treatment system.
- In another exemplary embodiment of the present invention, an exhaust gas treatment system for reducing constituents in the exhaust gas of an internal combustion engine comprises a ceramic wall flow monolith filter disposed within the exhaust gas treatment system having exhaust flow passages extending therethrough that are defined by longitudinally extending walls therebetween. A first subset of exhaust flow passages have open inlets and closed outlets to define inlet passages. As second subset of exhaust flow passages have closed inlets and open outlets to define outlet passages. Exhaust gas enters the ceramic wall flow monolith filter through the inlet passages and migrates through, as is filtered by the longitudinally extending walls to exit the filter through the outlet passages. A first catalyst composition that is operable, with an ammonia reductant, top catalytically reduce oxides of nitrogen in the exhaust gas is applied to a first portion of the ceramic wall flow monolith filter. A second catalyst composition for catalytic oxidation of hydrocarbon, carbon monoxide and ammonia in the exhaust gas is separately applied, serially downstream to a second portion of the ceramic wall flow monolith filter.
- In yet another exemplary embodiment of the present invention, an exhaust gas treatment system for reducing constituents in the exhaust gas of and internal combustion engine include an oxidation catalyst and a particulate filter downstream of the oxidation catalyst for removal of particulates from the exhaust gas. A first catalyst composition, operable to catalytically reduce oxides of nitrogen in the exhaust gas is applied to a first portion of the particulate filter and a second catalyst composition for catalytic oxidation of hydrocarbon, carbon monoxide and ammonia in the exhaust gas is applied serially downstream to a second portion of the particulate filter.
- The above features and advantages and other features and advantages of the present invention are readily apparent from the following detailed description of the best modes for carrying out the invention when taken in connection with the accompanying drawings.
- Other objects, features, advantages and details appear, by way of example only, in the following detailed description of embodiments, the detailed description referring to the drawings in which:
-
FIG. 1 is a schematic view of an exhaust treatment system for an internal combustion engine; and -
FIG. 2 is an axial, sectional view that schematically illustrates a portion of a ceramic monolith embodied in the exhaust treatment system ofFIG. 1 . - Referring to
FIG. 1 , an exemplary embodiment of the invention is directed to an exhaustgas treatment system 10 for the reduction of regulated exhaust constituents of an internal combustion engine, such asdiesel engine 12. The exhaustgas treatment system 10 includes anexhaust conduit 14 that transports exhaust gas from thediesel engine 12 to the various exhaust treatment components of the exhaust gas treatment system. The exhaust treatment components may include a Diesel Oxidation Catalyst (“DOC”) 16. The DOC may include a flow through ceramic monolith (not shown) that is has an oxidation catalyst disposed thereon. The oxidation catalyst may be applied as a wash coat and may contain precious group metals such as platinum (Pt), palladium (Pd), rhodium (Rh) or other suitable oxidizing catalysts, or combination thereof. TheDOC 16 is useful in treating unburned gaseous and non-volatile HC and CO, which are combusted to form carbon dioxide and water. - Downstream of the
DOC 16, a reductant may be injected into theexhaust gas 20 in theexhaust conduit 14. NH3 in the form of a gas, a liquid or an aqueous urea solution may be used as the reductant and may be mixed with air in theinjector nozzle 18 to aid in the dispersion of the injected spray. The exhaust gas stream containing the added NH3 passes through an SCR device, in this case a DPF having an SCR catalyst applied thereto. The DPF/SCR 22 is configured to filter the exhaust gas to remove carbon and other particulates and to reduce the NOx levels resident in the exhaust gas stream. The DPF/SCR 22 just described is typically referred to as a 2-way device as a result of its ability to treat or remove more than one exhaust component. - The DPF/
SCR 22 may be constructed with a ceramic wallflow monolith filter 23,FIG. 2 , that has a plurality of longitudinally extendingpassages 24 defined by longitudinally extendingwalls 26. Thepassages 24 include a subset ofinlet passages 28 that have anopen inlet end 30 and a closedoutlet end 32, and a subset ofoutlet passages 34 that have a closedinlet end 36 and anopen outlet end 38. Exhaust gas entering the DPF/SCR 22 through theinlet end 30 of theinlet passages 28 is forced to migrate through the associated longitudinally extendingwalls 26 to theoutlet passages 34. It is through this wall flow mechanism that theexhaust gas 20 is filtered of carbon and other particulates. The filteredparticulates 40 are deposited on the longitudinally extendingwalls 26 of theinlet passages 28 and, over time, will have the effect of increasing the exhaust backpressure experienced by thediesel engine 12. - In an exemplary embodiment of the exhaust
gas treatment system 10, anSCR catalyst composition 42 preferably contains a zeolite and one or more base metal components such as iron (Fe), cobalt (Co), copper (Cu) or vanadium (V) which can operate efficiently to convert the NOx constituents in theexhaust gas 20 across the operating range of the DPF/SCR 22. TheSCR catalyst composition 42 may be applied to the longitudinally extendingwalls 26 of theinlet passages 28, theoutlet passages 34, or both, of the ceramic wallflow monolith filter 23. Due to the porous nature of the ceramic wallflow monolith filter 23, the SCR catalyst may also be applied within the walls of the substrate to increase the contact time between theexhaust gas 20 and theSCR catalyst composition 42. The DPF/SCR 22 operates as an effective particulate filter and SCR system that is useful for remediation of the NOx in the engine exhaust gas while at the same time removing particulate mater therefrom. - To address exhaust backpressure issues caused by particulate accumulation, the DPF/
SCR 22 is periodically cleaned, or regenerated. Regeneration involves oxidation or burning of the accumulatedparticulate matter 40 in what is typically a high temperature (>600 C) environment. In an exemplary embodiment, excess HC is delivered to theDOC 16 for oxidation therein. The exothermal reaction caused by the oxidation of the HC will raise the temperature of theexhaust gas 20 upstream of the DPF/SCR 22 to required regeneration levels thereby burning or oxidizing the trapped particulate matter and cleaning the trap. - During the operation of the DPF/
SCR 22 and, particularly during the regeneration event, some excess HC and CO may pass through the oxidation catalyst to the DPF/SCR 22. Since HC and CO are regulated exhaust gas constituents their release to the atmosphere should be minimized in order to meet applicable regulations. Similarly, the quantity of NH3 injected into theexhaust gas 20 should be limited to that required for complete NOx conversion. However circumstances may occur in which some NH3 is not converted by the SCR catalyst activity and passes through the DPF/SCR 22. The release of unconverted NH3 is undesirable. - The unintentional passage of HC, CO and/or NH3 through the DPF/
SCR 22 is referred to as “slip”. To reduce the slip of HC, CO and/or NH3 through the DPF/SCR 22, anadditional catalyst 44 containing precious group metals such as platinum (Pt), palladium (Pd), rhodium (Rh) or other suitable oxidizing catalyst or combination thereof is applied serially downstream of theSCR catalyst composition 42,FIG. 2 , adjacent to the open outlet ends 38 of theoutlet passages 34 of the DPF/SCR 22. In a preferred embodiment, and to improve the flow through characteristics of the DPF/SCR 22, theadditional catalyst 44 is applied separately to the DPF/SCR and is not layered over theSCR catalyst composition 42. When excess HC, CO and/or NH3 enters or “slips” into the zone defined by thedownstream catalyst 44 they are oxidized to non-regulated and desired elements. As a result, the HC, CO and/or NH3 slips in the exhaust gas exiting the DPF/SCR 22 are treated, without the additional cost or complexity of a separate, stand-alone catalyst device downstream of the DPF/SCR 22 for HC, CO and NH3 slip control. - While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents maybe substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the present application.
Claims (13)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US12/472,832 US20100300078A1 (en) | 2009-05-27 | 2009-05-27 | Exhaust After Treatment System |
DE102010021589A DE102010021589A1 (en) | 2009-05-27 | 2010-05-26 | aftertreatment system |
CN2010102397239A CN101900015A (en) | 2009-05-27 | 2010-05-27 | Exhaust after treatment system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/472,832 US20100300078A1 (en) | 2009-05-27 | 2009-05-27 | Exhaust After Treatment System |
Publications (1)
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US20100300078A1 true US20100300078A1 (en) | 2010-12-02 |
Family
ID=43218645
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/472,832 Abandoned US20100300078A1 (en) | 2009-05-27 | 2009-05-27 | Exhaust After Treatment System |
Country Status (3)
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US (1) | US20100300078A1 (en) |
CN (1) | CN101900015A (en) |
DE (1) | DE102010021589A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012135871A1 (en) * | 2011-03-29 | 2012-10-04 | Basf Corporation | Multi-component filters for emissions control |
US20130047583A1 (en) * | 2011-08-31 | 2013-02-28 | Caterpillar Inc. | Aftertreatment system |
GB2495112A (en) * | 2011-09-29 | 2013-04-03 | Jaguar Cars | Engine Exhaust Gas After Treatment using Diesel Particulate Filters |
EP2541012A3 (en) * | 2011-07-01 | 2014-02-26 | Hyundai Motor Company | System for purifying exhaust gas and corresponding exhaust system |
EP2937534A4 (en) * | 2012-12-18 | 2016-01-13 | Toyota Motor Co Ltd | System for purifying exhaust of internal combustion engine |
CN106362582A (en) * | 2015-07-24 | 2017-02-01 | 中船重工海博威(江苏)科技发展有限公司 | Method and apparatus for catalytic oxidation treatment of ammonia-containing exhaust gas |
US10344643B2 (en) * | 2015-09-24 | 2019-07-09 | Honda Motor Co., Ltd. | Exhaust purification system of internal combustion engine |
US10677124B2 (en) | 2015-09-24 | 2020-06-09 | Honda Motor Co., Ltd. | Exhaust purification filter |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5937067B2 (en) * | 2011-04-28 | 2016-06-22 | エヌ・イーケムキャット株式会社 | Exhaust gas purification device |
TWI543813B (en) * | 2013-04-12 | 2016-08-01 | 財團法人工業技術研究院 | Catalyst for oxidizing ammonia and method for removing ammonia |
US10252217B2 (en) * | 2014-06-05 | 2019-04-09 | Basf Corporation | Catalytic articles containing platinum group metals and non-platinum group metals and methods of making and using same |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5778667A (en) * | 1996-06-18 | 1998-07-14 | Toyota Jidosha Kabushiki, Kaisha | Method and a device for purifying combustion exhaust gas |
US6167696B1 (en) * | 1999-06-04 | 2001-01-02 | Ford Motor Company | Exhaust gas purification system for low emission vehicle |
US20040116276A1 (en) * | 2002-02-12 | 2004-06-17 | Aleksey Yezerets | Exhaust aftertreatment emission control regeneration |
US6753294B1 (en) * | 1999-08-13 | 2004-06-22 | Johnson Matthey Public Limited Company | Catalytic wall-flow filter |
US20050069476A1 (en) * | 2001-12-20 | 2005-03-31 | Blakeman Philip Gerald | Selective catalytic reduction |
EP1617051A1 (en) * | 2004-07-15 | 2006-01-18 | Peugeot Citroen Automobiles SA | Exhaust line for an internal combustion engine and purifying system of the exhaust gas |
US20060179825A1 (en) * | 2005-02-16 | 2006-08-17 | Eaton Corporation | Integrated NOx and PM reduction devices for the treatment of emissions from internal combustion engines |
US20070079602A1 (en) * | 2005-07-07 | 2007-04-12 | Eaton Corporation | Thermal management of hybrid LNT/SCR aftertreatment during desulfation |
US20070107398A1 (en) * | 2003-06-25 | 2007-05-17 | Merkel Gregory A | Method of manufacturing a cordierite structure |
JP2007239752A (en) * | 2007-03-30 | 2007-09-20 | Toyota Motor Corp | Exhaust emission control device for internal combustion engine |
US20070269353A1 (en) * | 2003-11-04 | 2007-11-22 | Engelhard Corporation | Emission Treatment System with NSR and SCR Catalysts |
US20080041040A1 (en) * | 2006-08-16 | 2008-02-21 | Doring Andreas | Exhaust gas post treatment system |
US20080070778A1 (en) * | 2006-09-20 | 2008-03-20 | Castellano Christopher R | Catalysts to reduce nox in an exhaust gas stream and methods of preparation |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5296291B2 (en) * | 2005-12-08 | 2013-09-25 | いすゞ自動車株式会社 | Exhaust gas purification system |
US20080085231A1 (en) * | 2006-10-05 | 2008-04-10 | Frederic Vitse | System and method for reducing nitrogen oxides emissions |
US7845166B2 (en) * | 2007-09-27 | 2010-12-07 | Tenneco Automotive Operating Company Inc. | Exhaust system with plural emission treatment devices |
-
2009
- 2009-05-27 US US12/472,832 patent/US20100300078A1/en not_active Abandoned
-
2010
- 2010-05-26 DE DE102010021589A patent/DE102010021589A1/en not_active Withdrawn
- 2010-05-27 CN CN2010102397239A patent/CN101900015A/en active Pending
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5778667A (en) * | 1996-06-18 | 1998-07-14 | Toyota Jidosha Kabushiki, Kaisha | Method and a device for purifying combustion exhaust gas |
US6167696B1 (en) * | 1999-06-04 | 2001-01-02 | Ford Motor Company | Exhaust gas purification system for low emission vehicle |
US6753294B1 (en) * | 1999-08-13 | 2004-06-22 | Johnson Matthey Public Limited Company | Catalytic wall-flow filter |
US20050069476A1 (en) * | 2001-12-20 | 2005-03-31 | Blakeman Philip Gerald | Selective catalytic reduction |
US20040116276A1 (en) * | 2002-02-12 | 2004-06-17 | Aleksey Yezerets | Exhaust aftertreatment emission control regeneration |
US20070107398A1 (en) * | 2003-06-25 | 2007-05-17 | Merkel Gregory A | Method of manufacturing a cordierite structure |
US20070269353A1 (en) * | 2003-11-04 | 2007-11-22 | Engelhard Corporation | Emission Treatment System with NSR and SCR Catalysts |
EP1617051A1 (en) * | 2004-07-15 | 2006-01-18 | Peugeot Citroen Automobiles SA | Exhaust line for an internal combustion engine and purifying system of the exhaust gas |
US20060179825A1 (en) * | 2005-02-16 | 2006-08-17 | Eaton Corporation | Integrated NOx and PM reduction devices for the treatment of emissions from internal combustion engines |
US20070079602A1 (en) * | 2005-07-07 | 2007-04-12 | Eaton Corporation | Thermal management of hybrid LNT/SCR aftertreatment during desulfation |
US20080041040A1 (en) * | 2006-08-16 | 2008-02-21 | Doring Andreas | Exhaust gas post treatment system |
US20080070778A1 (en) * | 2006-09-20 | 2008-03-20 | Castellano Christopher R | Catalysts to reduce nox in an exhaust gas stream and methods of preparation |
JP2007239752A (en) * | 2007-03-30 | 2007-09-20 | Toyota Motor Corp | Exhaust emission control device for internal combustion engine |
Non-Patent Citations (1)
Title |
---|
Translation of EP 1617051 * |
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CN101900015A (en) | 2010-12-01 |
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