US20090151341A1 - Apparatus for reducing nitrogen oxide contained in exhaust gas - Google Patents
Apparatus for reducing nitrogen oxide contained in exhaust gas Download PDFInfo
- Publication number
- US20090151341A1 US20090151341A1 US12/208,889 US20888908A US2009151341A1 US 20090151341 A1 US20090151341 A1 US 20090151341A1 US 20888908 A US20888908 A US 20888908A US 2009151341 A1 US2009151341 A1 US 2009151341A1
- Authority
- US
- United States
- Prior art keywords
- doc
- exhaust gas
- cpf
- exhaust
- nozzle
- 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.)
- Abandoned
Links
Images
Classifications
-
- 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]
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
- B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
-
- 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
-
- 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
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/10—Noble metals or compounds thereof
- B01D2255/102—Platinum group metals
- B01D2255/1021—Platinum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/10—Noble metals or compounds thereof
- B01D2255/102—Platinum group metals
- B01D2255/1023—Palladium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20738—Iron
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/50—Zeolites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/915—Catalyst supported on particulate filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/064—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof containing iron group metals, noble metals or copper
- B01J29/072—Iron group metals or copper
-
- 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
- F01N2250/00—Combinations of different methods of purification
- F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
-
- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- 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
- F01N2610/00—Adding substances to exhaust gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to an exhaust apparatus of vehicles. More particularly, the present invention relates to an apparatus for reducing nitrogen oxide contained in exhaust gas that effectively reduces the nitrogen oxide in the exhaust gas.
- exhaust gas flowing out through an exhaust manifold from an engine is driven into a catalytic converter mounted at an exhaust pipe and is purified therein. After that, the noise of the exhaust gas is decreased while passing through a muffler and then the exhaust gas is emitted into the air through a tail pipe.
- the catalytic converter is a type of diesel particulate filter (DPF) and purifies pollutants contained in the exhaust gas.
- a catalytic carrier for trapping particulate material (PM) contained in the exhaust gas is in the catalytic converter, and the exhaust gas flowing out from the engine is purified through a chemical reaction.
- One type of catalytic converter is a selective catalytic reduction (SCR) apparatus.
- SCR selective catalytic reduction
- reductants such as carbon monoxide and total hydrocarbon (THC) react better with nitrogen oxide than oxygen.
- THC total hydrocarbon
- a diesel oxidation catalyst (DOC) device oxidizes total hydrocarbon (THC) and carbon monoxide (CO), and oxidizes nitrogen monoxide (NO) into nitrogen dioxide (NO 2 ).
- an SCR device reduces nitrogen oxide (NO x ) into nitrogen gas (N 2 ) by using the NO 2 generated in the DOC device and a reductant.
- EGR exhaust gas regeneration
- the NO 2 generated by oxidizing NO is used in the DOC device when the THC and the CO are oxidized in a cool starting. That is, the NO 2 is used when the THC and the CO are oxidized at low temperature.
- Equation 1 represents a soot regeneration reaction performed in the CPF device.
- Embodiments of the present invention has been made in an effort to provide an apparatus for reducing nitrogen oxide contained in exhaust gas having advantages of fully oxidizing THC and CO contained in the exhaust gas and sufficiently reducing NO x as a consequence that a SCR device uses NO 2 generated when the THC and CO are oxidized.
- An apparatus for reducing nitrogen oxide contained in exhaust gas may include: a diesel oxidation catalyst (DOC) device primarily oxidizing an exhaust materials containing total hydrocarbon (THC) and carbon monoxide (CO) in the exhaust gas by using a first diesel oxidation catalyst (DOC); a catalyzed particulate filter (CPF) device mounted downstream of the DOC device so as to receive the exhaust gas that is primarily oxidized by the DOC device, further oxidizing the exhaust materials containing the THC and the CO by heat generated during the primary oxidation and an oxidizing agent coated therein, and oxidizing nitrogen monoxide (NO) in the exhaust gas into nitrogen dioxide (NO 2 ) by using the generated heat and the oxidizing agent coated therein; a nozzle mounted downstream of the CPF device, and dosing a reductant to the exhaust gas; and a selective catalytic reduction (SCR) device mounted downstream of the nozzle, and reducing nitrogen oxide (NO x ) in the exhaust gas into nitrogen gas
- an apparatus for reducing nitrogen oxide contained in exhaust gas may further comprise a turbo charger mounted upstream of the DOC device, wherein the turbo charger is disposed apart from the DOC device by a predetermined distance such that the first oxidation reaction occurs at a good pace in the DOC device.
- the predetermined distance may be between about 100 mm and about 150 mm.
- the turbo charger, the DOC device, the CPF device, the nozzle and the SCR device may be mounted on an exhaust pipe.
- the turbo charger, the DOC device, the CPF device may be positioned upstream of the exhaust pipe and the nozzle and the SCR device may be mounted downstream of the exhaust pipe.
- a noble metal comprising platinum (Pt) and palladium (Pd) may be used for the first DOC in the DOC device, and a ratio of the platinum to the palladium may be 1:1-12:1.
- the diameter of the first DOC may be between about 100 mm and about 144 mm, and the length thereof is between about 100 mm and about 120 mm.
- a loading amount of the noble metal in the first DOC may be about 80-150 g/ft 3 .
- the oxidizing agent may be coated at a catalyzed particulate filter (CPF) of the CPF device.
- CPF catalyzed particulate filter
- a noble metal comprising Pt and Pd may be used for the oxidizing agent, and wherein a ratio of the Pt to the Pd is 2:1-6:1.
- a loading amount of the noble metal in the oxidizing agent may be 30-80 g/ft 3 . 60-80% of the oxidizing agent may be coated at a front portion in the CPF.
- the reductant may be ammonia.
- the reductant may be dosed in form of urea.
- the selective catalytic reduction (SCR) device may include a Fe-zeolite catalyst.
- FIG. 1 is a schematic diagram of an apparatus for reducing nitrogen oxide contained in exhaust gas according to an exemplary embodiment of the present invention.
- FIG. 2 is a flowchart showing processes performed by an apparatus for reducing nitrogen oxide contained in exhaust gas according to an exemplary embodiment of the present invention.
- FIG. 1 is a schematic diagram of an apparatus for reducing nitrogen oxide contained in exhaust gas according to an exemplary embodiment of the present invention.
- exhaust gas generated in an engine 10 flows sequentially through a turbo charger 20 , a DOC device 30 , a CPF device 40 , a nozzle 50 , and an SCR device 60 , and noxious materials contained in the exhaust gas are removed.
- the turbo charger 20 , the DOC device 30 , the CPF device 40 , the nozzle 50 , and the SCR device 60 are mounted on an exhaust pipe 70 .
- the engine 10 includes a plurality of cylinders (not shown) for burning an air-fuel mixture.
- Each cylinder is connected to an intake manifold (not shown) so as to receive the air-fuel mixture, and the intake manifold is connected to an intake pipe (not shown) so as to receive fresh air.
- each cylinder is connected to an exhaust manifold (not shown) and the exhaust gas generated in a combustion process is gathered in the exhaust manifold.
- the exhaust manifold is connected to the exhaust pipe 70 .
- the turbo charger 20 rotates a turbine (not shown) by using energy of the exhaust gas and an increases air drawing amount.
- the DOC device 30 is mounted downstream of the turbo charger 20 , and is disposed apart from the turbo charger 20 by a predetermined distance L1 such that a first oxidation occurs at a good pace in the DOC device 30 .
- the predetermined distance L1 may be 100-150 mm.
- a first DOC is coated in the DOC device 30 , and a noble metal including platinum (Pt) and palladium (Pd) is used for the first DOC.
- a noble metal including platinum (Pt) and palladium (Pd) is used for the first DOC.
- the ratio of the platinum to the palladium may be 1:1-12:1 and the loading amount of the noble metal may be 80-150 g/ft 3 .
- the flow of the exhaust gas must have a constant diameter in order to perform the first oxidation.
- the diameter of the first DOC may be 100-144 mm, and the length thereof may be 100-120 mm.
- the DOC device 30 oxidizes an exhaust materials containing THC and CO in the exhaust gas primarily, and transmits the oxidized exhaust gas to the CPF device 40 mounted downstream thereof. In addition, the DOC device 30 transmits heat generated during the primary oxidation of the exhaust materials containing the THC and the CO to the CPF device 40 such that the heat is used in a secondary oxidation.
- the primary oxidation performed in the DOC device 30 is described in the following Equation 2.
- the CPF device 40 is mounted downstream of the DOC device 30 and receives the exhaust gas primarily oxidized in the DOC device 30 and the heat generated in the primary oxidation.
- the CPF device 40 is provided with a CPF mounted therein and filters PM contained in the exhaust gas.
- a second DOC that is, an oxidizing agent
- a second DOC is coated in the CPF such that the exhaust materials containing the THC and the CO are secondarily oxidized therein and NO is oxidized into NO 2 . Since the secondary oxidation of the exhaust materials containing the THC and the CO in the CPF device 40 is performed by using the heat of the DOC device 30 , NO 2 is not used in the secondary oxidation. Therefore, NO 2 is generated in the CPF device 40 .
- the second DOC In order to effectively use the heat of the DOC device 30 , 60-80% of the second DOC is coated at a front portion in the CPF. A noble metal including the platinum (Pt) and the palladium (Pd) is used for the second DOC.
- the ratio of the platinum to the palladium in the second DOC may be 2:1-6:1, and the loading amount of the noble metal may be 30-80 g/ft 3 .
- the nozzle 50 is mounted downstream of the CPF device 40 , and doses a reductant to the exhaust gas secondarily oxidized in the CPF device 40 .
- the reductant may be ammonia.
- urea is dosed into the exhaust gas by the nozzle 50 and the urea is decomposed into ammonia.
- the exhaust gas mixed with the reductant and the NO 2 generated in the CPF device 40 are transmitted to the SCR device 60 .
- the SCR device 60 is mounted downstream of the nozzle 50 , and includes a Fe-zeolite catalyst.
- the SCR device 60 reduces NO x contained in the exhaust gas into nitrogen gas (N 2 ) by using the NO 2 generated in the CPF device 40 and the reductant dosed through the nozzle 50 so as to reduce the NO x amount in the exhaust gas.
- FIG. 2 is a flowchart showing processes performed by an apparatus for reducing nitrogen oxide contained in exhaust gas according to an exemplary embodiment of the present invention.
- the exhaust gas burned in the engine 10 and passing through the turbo charger 20 flows into the DOC device 30 , and the DOC device 30 primarily oxidizes the exhaust materials containing the THC and the CO in the exhaust gas at a step S 110 .
- the primarily oxidized exhaust gas and the heat generated in the primary oxidation are transmitted to the CPF device 40 , and the CPF device 40 secondarily oxidizes the exhaust materials containing the THC and the CO in the exhaust gas at a step S 120 .
- the CPF device 40 oxidizes the NO in the exhaust gas into the NO 2 at a step S 130 .
- the nozzle 50 doses the reductant at a step S 140 into the exhaust gas that is secondarily oxidized, and the exhaust gas is transmitted to the SCR device 60 .
- the SCR device 60 reduces the NO x into the N 2 at a step S 150 by using the NO 2 generated in the CPF device 40 and the reductant dosed by the nozzle 50 .
- THC and CO are primarily oxidized in a DOC device and are secondarily oxidized in a CPF device by using heat generated in the primary oxidation, amount of the THC and the CO contained in exhaust gas may be sufficiently reduced.
- the amount of the NO x contained in the exhaust gas may be sufficiently reduced.
Abstract
Description
- This application claims priority to and the benefit of Korean Patent Application No. 10-2007-0131563 filed in the Korean Intellectual Property Office on Dec. 14, 2007, the entire contents of which are incorporated herein by reference.
- (a) Field of the Invention
- The present invention relates to an exhaust apparatus of vehicles. More particularly, the present invention relates to an apparatus for reducing nitrogen oxide contained in exhaust gas that effectively reduces the nitrogen oxide in the exhaust gas.
- (b) Description of the Related Art
- Generally, exhaust gas flowing out through an exhaust manifold from an engine is driven into a catalytic converter mounted at an exhaust pipe and is purified therein. After that, the noise of the exhaust gas is decreased while passing through a muffler and then the exhaust gas is emitted into the air through a tail pipe. The catalytic converter is a type of diesel particulate filter (DPF) and purifies pollutants contained in the exhaust gas. A catalytic carrier for trapping particulate material (PM) contained in the exhaust gas is in the catalytic converter, and the exhaust gas flowing out from the engine is purified through a chemical reaction.
- One type of catalytic converter is a selective catalytic reduction (SCR) apparatus. In the selective catalytic reduction (SCR) apparatus, reductants such as carbon monoxide and total hydrocarbon (THC) react better with nitrogen oxide than oxygen. Thus, such a catalytic converter is called a selective catalytic reduction apparatus.
- According to a conventional apparatus for reducing nitrogen oxide contained in exhaust gas, a diesel oxidation catalyst (DOC) device oxidizes total hydrocarbon (THC) and carbon monoxide (CO), and oxidizes nitrogen monoxide (NO) into nitrogen dioxide (NO2). After that, an SCR device reduces nitrogen oxide (NOx) into nitrogen gas (N2) by using the NO2 generated in the DOC device and a reductant. However, as exhaust gas regeneration (EGR) technology and post injection technology becomes applied to vehicles, the THC and the CO contained in an exhaust gas further increases. In addition, the NO2 generated by oxidizing NO is used in the DOC device when the THC and the CO are oxidized in a cool starting. That is, the NO2 is used when the THC and the CO are oxidized at low temperature.
- In addition, if the NO2 is generated in the DOC device, the NO2 is used for regenerating soot in a catalyzed particulate filter (CPF) device disposed at the rear of the DOC device. Equation 1 below represents a soot regeneration reaction performed in the CPF device.
-
C+NO2→CO/CO2+NO [Equation 1] - Therefore, it is difficult to reduce the NOx by using the NO2 generated in the DOC device according to the conventional apparatus for reducing nitrogen oxide contained in exhaust gas.
- In addition, since, by applying the EGR technology and the post injection technology to the vehicles, the increased THC and CO are oxidized only in the DOC device, the THC and the CO are not fully oxidized.
- The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
- Embodiments of the present invention has been made in an effort to provide an apparatus for reducing nitrogen oxide contained in exhaust gas having advantages of fully oxidizing THC and CO contained in the exhaust gas and sufficiently reducing NOx as a consequence that a SCR device uses NO2 generated when the THC and CO are oxidized.
- An apparatus for reducing nitrogen oxide contained in exhaust gas according to an exemplary embodiment of the present invention may include: a diesel oxidation catalyst (DOC) device primarily oxidizing an exhaust materials containing total hydrocarbon (THC) and carbon monoxide (CO) in the exhaust gas by using a first diesel oxidation catalyst (DOC); a catalyzed particulate filter (CPF) device mounted downstream of the DOC device so as to receive the exhaust gas that is primarily oxidized by the DOC device, further oxidizing the exhaust materials containing the THC and the CO by heat generated during the primary oxidation and an oxidizing agent coated therein, and oxidizing nitrogen monoxide (NO) in the exhaust gas into nitrogen dioxide (NO2) by using the generated heat and the oxidizing agent coated therein; a nozzle mounted downstream of the CPF device, and dosing a reductant to the exhaust gas; and a selective catalytic reduction (SCR) device mounted downstream of the nozzle, and reducing nitrogen oxide (NOx) in the exhaust gas into nitrogen gas (N2) by using the NO2 generated in the CPF device and the reductant. The DOC device, the CPF device, the nozzle and the SCR device may be mounted on an exhaust pipe. The DOC device and the CPF device may be positioned upstream of the exhaust pipe and the nozzle and the SCR device may be mounted downstream of the exhaust pipe.
- In another exemplary embodiment of the present invention, an apparatus for reducing nitrogen oxide contained in exhaust gas may further comprise a turbo charger mounted upstream of the DOC device, wherein the turbo charger is disposed apart from the DOC device by a predetermined distance such that the first oxidation reaction occurs at a good pace in the DOC device. The predetermined distance may be between about 100 mm and about 150 mm. The turbo charger, the DOC device, the CPF device, the nozzle and the SCR device may be mounted on an exhaust pipe. The turbo charger, the DOC device, the CPF device may be positioned upstream of the exhaust pipe and the nozzle and the SCR device may be mounted downstream of the exhaust pipe.
- In further another exemplary embodiment of the present invention, a noble metal comprising platinum (Pt) and palladium (Pd) may be used for the first DOC in the DOC device, and a ratio of the platinum to the palladium may be 1:1-12:1. The diameter of the first DOC may be between about 100 mm and about 144 mm, and the length thereof is between about 100 mm and about 120 mm. A loading amount of the noble metal in the first DOC may be about 80-150 g/ft3.
- In another exemplary embodiment of the present invention, the oxidizing agent may be coated at a catalyzed particulate filter (CPF) of the CPF device. A noble metal comprising Pt and Pd may be used for the oxidizing agent, and wherein a ratio of the Pt to the Pd is 2:1-6:1. A loading amount of the noble metal in the oxidizing agent may be 30-80 g/ft3. 60-80% of the oxidizing agent may be coated at a front portion in the CPF.
- The reductant may be ammonia. The reductant may be dosed in form of urea.
- The selective catalytic reduction (SCR) device may include a Fe-zeolite catalyst.
-
FIG. 1 is a schematic diagram of an apparatus for reducing nitrogen oxide contained in exhaust gas according to an exemplary embodiment of the present invention. -
FIG. 2 is a flowchart showing processes performed by an apparatus for reducing nitrogen oxide contained in exhaust gas according to an exemplary embodiment of the present invention. - An exemplary embodiment of the present invention will hereinafter be described in detail with reference to the accompanying drawings.
-
FIG. 1 is a schematic diagram of an apparatus for reducing nitrogen oxide contained in exhaust gas according to an exemplary embodiment of the present invention. - As shown in
FIG. 1 , exhaust gas generated in anengine 10 flows sequentially through aturbo charger 20, aDOC device 30, aCPF device 40, anozzle 50, and anSCR device 60, and noxious materials contained in the exhaust gas are removed. Theturbo charger 20, theDOC device 30, theCPF device 40, thenozzle 50, and theSCR device 60 are mounted on anexhaust pipe 70. - The
engine 10 includes a plurality of cylinders (not shown) for burning an air-fuel mixture. Each cylinder is connected to an intake manifold (not shown) so as to receive the air-fuel mixture, and the intake manifold is connected to an intake pipe (not shown) so as to receive fresh air. - In addition, each cylinder is connected to an exhaust manifold (not shown) and the exhaust gas generated in a combustion process is gathered in the exhaust manifold. The exhaust manifold is connected to the
exhaust pipe 70. - The
turbo charger 20 rotates a turbine (not shown) by using energy of the exhaust gas and an increases air drawing amount. - The
DOC device 30 is mounted downstream of theturbo charger 20, and is disposed apart from theturbo charger 20 by a predetermined distance L1 such that a first oxidation occurs at a good pace in theDOC device 30. The predetermined distance L1 may be 100-150 mm. - A first DOC is coated in the
DOC device 30, and a noble metal including platinum (Pt) and palladium (Pd) is used for the first DOC. In order to effectively perform the first oxidation, the ratio of the platinum to the palladium may be 1:1-12:1 and the loading amount of the noble metal may be 80-150 g/ft3. In addition, the flow of the exhaust gas must have a constant diameter in order to perform the first oxidation. For this purpose, the diameter of the first DOC may be 100-144 mm, and the length thereof may be 100-120 mm. - The
DOC device 30 oxidizes an exhaust materials containing THC and CO in the exhaust gas primarily, and transmits the oxidized exhaust gas to theCPF device 40 mounted downstream thereof. In addition, theDOC device 30 transmits heat generated during the primary oxidation of the exhaust materials containing the THC and the CO to theCPF device 40 such that the heat is used in a secondary oxidation. The primary oxidation performed in theDOC device 30 is described in the following Equation 2. -
4HC+3O2→2CO2+2H2O -
2CO+O2→2CO2 [Equation 2] - The
CPF device 40 is mounted downstream of theDOC device 30 and receives the exhaust gas primarily oxidized in theDOC device 30 and the heat generated in the primary oxidation. TheCPF device 40 is provided with a CPF mounted therein and filters PM contained in the exhaust gas. In addition, a second DOC (that is, an oxidizing agent) is coated in the CPF such that the exhaust materials containing the THC and the CO are secondarily oxidized therein and NO is oxidized into NO2. Since the secondary oxidation of the exhaust materials containing the THC and the CO in theCPF device 40 is performed by using the heat of theDOC device 30, NO2 is not used in the secondary oxidation. Therefore, NO2 is generated in theCPF device 40. - In order to effectively use the heat of the
DOC device 30, 60-80% of the second DOC is coated at a front portion in the CPF. A noble metal including the platinum (Pt) and the palladium (Pd) is used for the second DOC. In order to prevent the reducing ratio of the NOx from being deteriorated because of excess generation of the NO2, the ratio of the platinum to the palladium in the second DOC may be 2:1-6:1, and the loading amount of the noble metal may be 30-80 g/ft3. - The secondary oxidation performed in the
CPF device 40 is described in the following Equation 3. -
4HC+3O2→2CO2+2H2O -
2CO+O2→2CO2 -
2NO+O22NO2 [Equation 3] - The
nozzle 50 is mounted downstream of theCPF device 40, and doses a reductant to the exhaust gas secondarily oxidized in theCPF device 40. The reductant may be ammonia. Generally, urea is dosed into the exhaust gas by thenozzle 50 and the urea is decomposed into ammonia. - The exhaust gas mixed with the reductant and the NO2 generated in the
CPF device 40 are transmitted to theSCR device 60. - The
SCR device 60 is mounted downstream of thenozzle 50, and includes a Fe-zeolite catalyst. TheSCR device 60 reduces NOx contained in the exhaust gas into nitrogen gas (N2) by using the NO2 generated in theCPF device 40 and the reductant dosed through thenozzle 50 so as to reduce the NOx amount in the exhaust gas. - The reaction performed in the
SCR device 60 is described Equation 4 below. -
4NH3+4NO+O2→4N2+6H2O -
2NH3+NO+NO2→2N2+3H2O -
8NH3+6NO2→7N2+12H2O [Equation 4] - Hereinafter, operations of the apparatus for reducing nitrogen oxide contained in exhaust gas according to an exemplary embodiment of the present invention will be described in detail.
-
FIG. 2 is a flowchart showing processes performed by an apparatus for reducing nitrogen oxide contained in exhaust gas according to an exemplary embodiment of the present invention. - As shown in
FIG. 2 , the exhaust gas burned in theengine 10 and passing through theturbo charger 20 flows into theDOC device 30, and theDOC device 30 primarily oxidizes the exhaust materials containing the THC and the CO in the exhaust gas at a step S110. - The primarily oxidized exhaust gas and the heat generated in the primary oxidation are transmitted to the
CPF device 40, and theCPF device 40 secondarily oxidizes the exhaust materials containing the THC and the CO in the exhaust gas at a step S120. In addition, theCPF device 40 oxidizes the NO in the exhaust gas into the NO2 at a step S130. - After that, the
nozzle 50 doses the reductant at a step S140 into the exhaust gas that is secondarily oxidized, and the exhaust gas is transmitted to theSCR device 60. - The
SCR device 60 reduces the NOx into the N2 at a step S150 by using the NO2 generated in theCPF device 40 and the reductant dosed by thenozzle 50. - According to the present invention, since THC and CO are primarily oxidized in a DOC device and are secondarily oxidized in a CPF device by using heat generated in the primary oxidation, amount of the THC and the CO contained in exhaust gas may be sufficiently reduced.
- In addition, since NO is oxidized into NO2 by using heat generated when the THC and the CO are oxidized in the DOC device and an SCR device reduces NOx by using the NO2, the amount of the NOx contained in the exhaust gas may be sufficiently reduced.
- While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (17)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020070131563A KR100999616B1 (en) | 2007-12-14 | 2007-12-14 | Apparatus for reducing nitrogen oxide cotained in exhaust gas |
KR10-2007-0131563 | 2007-12-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090151341A1 true US20090151341A1 (en) | 2009-06-18 |
Family
ID=40680193
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/208,889 Abandoned US20090151341A1 (en) | 2007-12-14 | 2008-09-11 | Apparatus for reducing nitrogen oxide contained in exhaust gas |
Country Status (3)
Country | Link |
---|---|
US (1) | US20090151341A1 (en) |
KR (1) | KR100999616B1 (en) |
DE (1) | DE102008040000B4 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090158719A1 (en) * | 2007-12-12 | 2009-06-25 | Basf Catalysts Llc | Emission Treatment System |
US20100290964A1 (en) * | 2009-05-18 | 2010-11-18 | Southward Barry W L | HIGH Pd CONTENT DIESEL OXIDATION CATALYSTS WITH IMPROVED HYDROTHERMAL DURABILITY |
US20110099975A1 (en) * | 2009-11-03 | 2011-05-05 | Owen Herman Bailey | Architectural diesel oxidation catalyst for enhanced no2 generator |
US20110120093A1 (en) * | 2008-04-24 | 2011-05-26 | Stephan Eckhoff | Process and apparatus for purifying exhaust gases from an internal combustion engine |
WO2013027867A3 (en) * | 2011-08-24 | 2013-04-18 | Kabushiki Kaisha Toyota Jidoshokki | Exhaust gas purification catalyst |
US8745974B2 (en) | 2012-01-31 | 2014-06-10 | Caterpillar Inc. | Exhaust system |
CN106168153A (en) * | 2015-05-18 | 2016-11-30 | 福特环球技术公司 | Emission reduces system |
US9993771B2 (en) | 2007-12-12 | 2018-06-12 | Basf Corporation | Emission treatment catalysts, systems and methods |
EP2651540B1 (en) | 2010-12-14 | 2019-05-22 | Umicore AG & Co. KG | Architectural diesel oxidation catalyst for enhanced no2 generator |
Families Citing this family (1)
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 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030113249A1 (en) * | 2001-12-18 | 2003-06-19 | Hepburn Jeffrey Scott | System and method for removing SOx and particulate matter from an emission control device |
US20050056004A1 (en) * | 2000-08-15 | 2005-03-17 | Engelhard Corporation | Exhaust system for enhanced reduction of nitrogen oxides and particulates from diesel engines |
US20070175208A1 (en) * | 2003-01-02 | 2007-08-02 | Daimlerchrysler Ag | Exhaust Gas Aftertreatment Installation and Method |
US20080045405A1 (en) * | 2006-06-09 | 2008-02-21 | Tilman Wolfram Beutel | Pt-Pd diesel oxidation catalyst with CO/HC light-off and HC storage function |
US20080141661A1 (en) * | 2006-12-01 | 2008-06-19 | Kenneth Voss | Zone Coated Filter, Emission Treatment Systems and Methods |
US20090019831A1 (en) * | 2007-07-19 | 2009-01-22 | Achim Karl-Erich Heibel | Regeneration method for ceramic honeycomb structures |
US20090056310A1 (en) * | 2007-08-29 | 2009-03-05 | Ford Global Technologies, Llc | Multi-Stage Regeneration of Particulate Filter |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10020100A1 (en) * | 2000-04-22 | 2001-10-31 | Dmc2 Degussa Metals Catalysts | Process and catalyst for the reduction of nitrogen oxides |
US6813884B2 (en) * | 2002-01-29 | 2004-11-09 | Ford Global Technologies, Llc | Method of treating diesel exhaust gases |
GB0220645D0 (en) | 2002-09-05 | 2002-10-16 | Johnson Matthey Plc | Exhaust system for a lean burn ic engine |
GB2406803A (en) * | 2004-11-23 | 2005-04-13 | Johnson Matthey Plc | Exhaust system comprising exotherm-generating catalyst |
DE102005013707A1 (en) * | 2005-03-24 | 2006-09-28 | Daimlerchrysler Ag | Motor vehicle with internal combustion engine and method for operating an internal combustion engine |
KR100680184B1 (en) | 2005-07-06 | 2007-02-07 | 희성엥겔하드주식회사 | Diesel particulate filter |
-
2007
- 2007-12-14 KR KR1020070131563A patent/KR100999616B1/en active IP Right Grant
-
2008
- 2008-08-27 DE DE102008040000.9A patent/DE102008040000B4/en not_active Expired - Fee Related
- 2008-09-11 US US12/208,889 patent/US20090151341A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050056004A1 (en) * | 2000-08-15 | 2005-03-17 | Engelhard Corporation | Exhaust system for enhanced reduction of nitrogen oxides and particulates from diesel engines |
US20030113249A1 (en) * | 2001-12-18 | 2003-06-19 | Hepburn Jeffrey Scott | System and method for removing SOx and particulate matter from an emission control device |
US20070175208A1 (en) * | 2003-01-02 | 2007-08-02 | Daimlerchrysler Ag | Exhaust Gas Aftertreatment Installation and Method |
US20080045405A1 (en) * | 2006-06-09 | 2008-02-21 | Tilman Wolfram Beutel | Pt-Pd diesel oxidation catalyst with CO/HC light-off and HC storage function |
US20080141661A1 (en) * | 2006-12-01 | 2008-06-19 | Kenneth Voss | Zone Coated Filter, Emission Treatment Systems and Methods |
US20090019831A1 (en) * | 2007-07-19 | 2009-01-22 | Achim Karl-Erich Heibel | Regeneration method for ceramic honeycomb structures |
US20090056310A1 (en) * | 2007-08-29 | 2009-03-05 | Ford Global Technologies, Llc | Multi-Stage Regeneration of Particulate Filter |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9863297B2 (en) * | 2007-12-12 | 2018-01-09 | Basf Corporation | Emission treatment system |
US11344845B2 (en) | 2007-12-12 | 2022-05-31 | Basf Corporation | Emission treatment catalysts, systems and methods |
US9993771B2 (en) | 2007-12-12 | 2018-06-12 | Basf Corporation | Emission treatment catalysts, systems and methods |
US20090158719A1 (en) * | 2007-12-12 | 2009-06-25 | Basf Catalysts Llc | Emission Treatment System |
US20110120093A1 (en) * | 2008-04-24 | 2011-05-26 | Stephan Eckhoff | Process and apparatus for purifying exhaust gases from an internal combustion engine |
US8246923B2 (en) | 2009-05-18 | 2012-08-21 | Umicore Ag & Co. Kg | High Pd content diesel oxidation catalysts with improved hydrothermal durability |
US20100290964A1 (en) * | 2009-05-18 | 2010-11-18 | Southward Barry W L | HIGH Pd CONTENT DIESEL OXIDATION CATALYSTS WITH IMPROVED HYDROTHERMAL DURABILITY |
US8557203B2 (en) | 2009-11-03 | 2013-10-15 | Umicore Ag & Co. Kg | Architectural diesel oxidation catalyst for enhanced NO2 generator |
US20110099975A1 (en) * | 2009-11-03 | 2011-05-05 | Owen Herman Bailey | Architectural diesel oxidation catalyst for enhanced no2 generator |
EP2651540B1 (en) | 2010-12-14 | 2019-05-22 | Umicore AG & Co. KG | Architectural diesel oxidation catalyst for enhanced no2 generator |
WO2013027867A3 (en) * | 2011-08-24 | 2013-04-18 | Kabushiki Kaisha Toyota Jidoshokki | Exhaust gas purification catalyst |
US8745974B2 (en) | 2012-01-31 | 2014-06-10 | Caterpillar Inc. | Exhaust system |
CN106168153A (en) * | 2015-05-18 | 2016-11-30 | 福特环球技术公司 | Emission reduces system |
Also Published As
Publication number | Publication date |
---|---|
KR20090064008A (en) | 2009-06-18 |
KR100999616B1 (en) | 2010-12-08 |
DE102008040000B4 (en) | 2015-09-24 |
DE102008040000A1 (en) | 2009-06-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8402754B2 (en) | Apparatus for purifying exhaust gas | |
US20090151341A1 (en) | Apparatus for reducing nitrogen oxide contained in exhaust gas | |
US8168125B2 (en) | Diesel oxidation catalyst and exhaust system provided with the same | |
JP5757574B2 (en) | Method for purifying exhaust gas from diesel engines | |
KR101631149B1 (en) | Diesel engine exhaust gas purification device having ammonia decomposition module | |
EP2230001A1 (en) | Exhaust gas treatment | |
KR20040060716A (en) | NOx AFTERTREATMENT SYSTEM AND METHOD FOR INTERNAL COMBUSTION ENGINES | |
PL2042227T3 (en) | Emission treatment system and method using a scr filter | |
US8677740B2 (en) | Method for predicting regeneration of DeNOx catalyst and exhaust system using the same | |
BR112013021254B1 (en) | exhaust system for a lean-burn vehicle internal combustion engine; and, lean-burn internal combustion engine | |
JP2017150493A (en) | Improvement in control of emission | |
JP2010019239A (en) | Exhaust emission control device | |
US8327624B2 (en) | System for purifying exhaust gas | |
KR101795402B1 (en) | Exhaust system | |
US8105560B2 (en) | System for treating a gas stream | |
CN108060961B (en) | Reducing agent spray and exhaust flow guide and deflector | |
KR100999614B1 (en) | Apparatus for reducing nitrogen oxide in exhaust pipe | |
US20080041041A1 (en) | Method for Exhaust-Gas Treatment for Diesel Engines or the Like, and Apparatus for Implementing This Method | |
KR100587807B1 (en) | Control method of SCR | |
KR100911582B1 (en) | Apparatus for PM - NOx conversion | |
US20100154392A1 (en) | Adjusting nitrogen oxide ratios in exhaust gas | |
CN216894596U (en) | Gasoline engine tail gas aftertreatment system and vehicle thereof | |
CN216381563U (en) | Aftertreatment system, engine and vehicle | |
CN215927531U (en) | Engine exhaust system of diesel vehicle | |
JP5476770B2 (en) | Exhaust gas purification system and control method of exhaust gas purification system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: KIA MOTORS CORPORATION, KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, CHANG DAE;LEE, JIN HA;CHO, JI HO;REEL/FRAME:021516/0934 Effective date: 20080804 Owner name: HYUNDAI MOTOR COMPANY, KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, CHANG DAE;LEE, JIN HA;CHO, JI HO;REEL/FRAME:021516/0934 Effective date: 20080804 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |