US20080184698A1 - Exhaust Emission Control Device - Google Patents

Exhaust Emission Control Device Download PDF

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Publication number
US20080184698A1
US20080184698A1 US11/661,428 US66142805A US2008184698A1 US 20080184698 A1 US20080184698 A1 US 20080184698A1 US 66142805 A US66142805 A US 66142805A US 2008184698 A1 US2008184698 A1 US 2008184698A1
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United States
Prior art keywords
particulate filter
oxidation catalyst
frontward
fuel
exhaust
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
Application number
US11/661,428
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English (en)
Inventor
Tatsuki Igarashi
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Hino Motors Ltd
Original Assignee
Hino Motors Ltd
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Filing date
Publication date
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Assigned to HINO MOTORS, LTD. reassignment HINO MOTORS, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IGARASHI, TATSUKI
Publication of US20080184698A1 publication Critical patent/US20080184698A1/en
Abandoned legal-status Critical Current

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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
    • F01N3/02—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/80—Chemical processes for the removal of the retained particles, e.g. by burning
    • B01D46/84—Chemical processes for the removal of the retained particles, e.g. by burning by heating only
    • 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
    • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/9454—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific device
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • 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
    • F01N3/022—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 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • 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
    • F01N3/022—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 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0222—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 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
    • 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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—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 using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—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 using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • 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
    • B01D53/9459—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
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/06—Ceramic, e.g. monoliths
    • 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
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • 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
    • 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 emission control device.
  • Particulates or particulate matter from a diesel engine is mainly constituted by carbonic soot and a soluble organic fraction (SOF) of high-boiling hydrocarbon and contains a trace of sulfate (misty sulfuric acid fraction).
  • SOF soluble organic fraction
  • a particulate filter 4 is incorporated in an exhaust pipe 3 through which exhaust gas 2 from a diesel engine 1 flows as shown in FIG. 1 .
  • the particulate filter 4 comprises a porous honeycomb-structured filter body 7 made of ceramics such as cordierite and having lattice-like compartmentalized passages 5 ; alternate ones of the passages 5 have inlets plugged with plugs 8 and the remaining passages with unplugged open inlets are plugged at their outlets with plugs 9 .
  • the exhaust gas 2 passing through thin porous walls 6 compartmentalizing the respective passages 5 is discharged downstream and particulates are captured on inner surfaces of the thin porous walls 6 .
  • the particulates in the exhaust gas 2 which are captured and accumulated on the inner surfaces of the walls 6 , require to be burned off so as to regenerate the particulate filter 4 before exhaust resistance considerably increases due to clogging.
  • the exhaust gas from the diesel engine 1 in a normal engine operation status rarely has a chance to obtain a temperature level at which the particulates ignite by themselves.
  • a catalytic regenerative particulate filter 4 which comprises a filter body 7 integrally carrying an oxidation catalyst.
  • catalytic regenerative particulate filter 4 Use of such catalytic regenerative particulate filter 4 will accelerate oxidation reaction of captured particulates to lower their ignition temperature, so that the particulates can be burned off at exhaust temperature level lower than ever before.
  • a captured amount may exceed a treated amount of particulates in engine operation regions with low exhaust temperature level. Continued engine operation with such low exhaust temperature level may hinder good regeneration of the particulate filter 4 , resulting in excessive accumulation of the captured particulates in the filter 4 .
  • an oxidation catalyst 10 carried by a carrier in the form of a flow-through type honeycomb structure made of ceramics such as cordierite is arranged separately and frontward of the particulate filter 4 .
  • fuel is added to the exhaust gas 2 upstream of the oxidation catalyst 10 so as to forcedly regenerate the particulate filter 4 .
  • fuel (HC) added upstream of the particulate filter 4 undergoes oxidation reaction during its passage through cells 11 of the frontward oxidation catalyst 10 (see FIG. 3 ).
  • the exhaust gas 2 heated by heat of the reaction and flowing into the particulate filter 4 just behind increases a catalytic floor temperature level of the filter to burn off the particulates, thereby regenerating the particulate filter 4 .
  • This kind of fuel addition is usually realized in such a manner that fuel main injection at or near a compressive upper dead center is followed by post injection at non-ignition timing after the compressive upper dead center to thereby add fuel to the exhaust gas.
  • the main injection to the cylinders may be delayed into timing later than usual to thereby add the fuel to the exhaust gas 2 .
  • an injector as fuel addition means may be fitted into the exhaust pipe 3 at a proper position thereof (alternatively, into an exhaust manifold), the fuel being added to the exhaust gas directly through injection by the injector.
  • Reference 1 by the same applicant of this invention is an example of prior art documents on such forced regeneration of a particulate filter.
  • the invention was made in view of the above and has its object to provide an exhaust emission control device which can prevent an oxidation catalyst arranged frontward of a catalytic regenerative particulate filter from being clogged.
  • the invention is directed to an exhaust emission control device wherein a catalyst regenerative particulate filter is incorporated in an exhaust pipe and has a flow-through type oxidation catalyst arranged frontward of the filter, fuel being added to exhaust gas upstream of the particulate filter, heat generated by oxidation reaction of the added fuel on the frontward oxidation catalyst being used for combustion of captured particulates in the rearward particulate filter to thereby forcedly regenerate the particulate filter, characterized in that the frontward oxidation catalyst is carried by a metallic carrier.
  • cells of the oxidation catalyst through which the exhaust gas passes are allowed to have walls thin in thickness and smooth in surface.
  • a total area on the wall front ends of the cells is reduced in comparison with a whole front end area of the oxidation catalyst to thereby substantially reduce the area to which the particulates tend to attach; and, moreover, the particulates become less attachable also to inner wall surfaces of the cells.
  • the invention is also directed to an exhaust emission control device wherein a catalyst regenerative particulate filter is incorporated in an exhaust pipe and has a flow-through type oxidation catalyst arranged frontward of the filter, fuel being added to exhaust gas upstream of the particulate filter, heat generated by oxidation reaction of the added fuel on the frontward oxidation catalyst being used for combustion of captured particulates in the rearward particulate filter to thereby forcedly regenerate the particulate filter, characterized in that the frontward oxidation catalyst is divided into front and rear oxidation catalysts, the divided front and rear oxidation catalysts being carried by metallic and ceramic carriers, respectively.
  • the divided front and rear oxidation catalysts being carried by metallic and ceramic carriers, respectively and with respect to the front oxidation catalyst, in comparison with use of a conventional ceramic carrier, cells of the front oxidation catalyst through which the exhaust gas passes are allowed to have walls thin in thickness and smooth in surface; thus, a total area on the wall front ends of the cells is reduced in comparison with a whole front end area of the front oxidation catalyst to thereby reduce the area to which the particulates tend to attach; and, moreover, the particulates becomes less attachable also to inner wall surfaces of the cells.
  • the rear oxidation catalyst carried by the ceramic carrier with less heat conductivity which has less heat-dissipative than the metallic carrier with high heat conductivity, is superior in that it can elevate the exhaust gas in temperature within a shorter period of time from starting of the fuel addition.
  • the exhaust gas can be elevated in temperature at an early stage.
  • the oxidation catalyst arranged frontward of the particulate filter can be reliably prevented from being clogged. Forced regeneration of the particulate filter can be realized without any problem even at a temperature level (in the order of about 190° C.) which is tightly within a lower limit for catalytic activity of the oxidation catalyst.
  • a temperature level in the order of about 190° C.
  • the divided front and rear oxidation catalysts being carried by metallic and ceramic carriers, respectively and even in a continued light-load engine operation with low exhaust temperature level, the front and rear oxidation catalysts arranged frontward of the particulate filter can be prevented from being clogged.
  • the exhaust gas can be elevated in temperature at an early stage.
  • FIG. 1 A schematic view showing the prior art.
  • FIG. 2 A sectional view showing particulars of a particulate filter shown in FIG. 1 .
  • FIG. 3 A perspective view partly cut out showing particulars of an oxidation catalyst shown in FIG. 1 .
  • FIG. 4 A sectional view showing an embodiment of the invention.
  • FIG. 5 A sectional view showing a further embodiment of the invention.
  • FIG. 4 shows an embodiment of the invention.
  • a flow-through type oxidation catalyst 10 carried by a conventional honeycomb-structured ceramic carrier mentioned above with respect to FIG. 1 is substituted by a flow-through type oxidation catalyst 12 carried by a honeycomb-structured metallic carrier is arranged frontward of the catalyst regenerative particulate filter 4 .
  • This kind of metallic carrier used is made of metal such as stainless steel which is highly heat and corrosive resistant.
  • the walls have thickness in the order of about 150-200 ⁇ m and rough surfaces with minute irregularities whereas in the case of the carrier made of metal such as stainless steel, the walls may have thickness in the order of about 30-100 ⁇ m and smooth surfaces with extremely less irregularities.
  • a total area on the wall front ends of the cells 13 is reduced in comparison with a whole front end area of the oxidation catalyst 12 to thereby substantially reduce the area to which the particulates tend to attach and, moreover, the particulates become less attachable also to inner wall surfaces of the cells 13 .
  • the particulates or mixtures thereof with mists of the added fuel do not bridge over openings of the cells 13 and agglomeration based on such bridges is prevented from proceeding, whereby the oxidation catalyst 12 is prevented from being clogged.
  • the oxidation catalyst 12 arranged frontward of the particulate filter 4 can be reliably prevented from being clogged, and forced regeneration of the particulate filter 4 can be realized without any problem at a temperature level (in the order of about 190° C.) which is tightly within a lower limit for catalytic activity of the oxidation catalyst 12 .
  • FIG. 5 shows a further embodiment of the invention.
  • an oxidation catalyst arranged frontward of a particulate filter 4 is divided into front and rear oxidation catalysts, the divided front and rear elongate oxidation catalysts 12 and 14 being carried by metallic and ceramic carriers, respectively.
  • reference numeral 15 denotes cells in the rear oxidation catalyst 14 through which the exhaust gas 2 passes.
  • the divided front and rear oxidation catalysts 12 and 14 being carried by metallic and ceramic carriers, respectively and first with respect to the front oxidation catalyst 12 , in comparison with use of a conventional ceramic carrier, the cells 13 through which the exhaust gas 2 passes are allowed to have walls thin in thickness and smooth in surface.
  • a total area on the wall front ends of the cells 13 is reduced in comparison with a whole front end area of the front oxidation catalyst 12 to thereby substantially reduce the area to which the particulates tend to attach; and, moreover, the particulates become less attachable also to inner wall surfaces of the cells 13 .
  • the rear oxidation catalyst 14 carried by the ceramic carrier with less heat conductivity which has less heat-dissipative than the metallic carrier with high heat conductivity, is superior in that it can elevate the exhaust gas 2 in temperature within a shorter period of time from starting of the fuel addition.
  • the exhaust gas 2 can be elevated in temperature at an early stage.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Geometry (AREA)
  • Physics & Mathematics (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
US11/661,428 2004-09-07 2005-09-06 Exhaust Emission Control Device Abandoned US20080184698A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2004259713A JP2006077591A (ja) 2004-09-07 2004-09-07 排気浄化装置
JP2004-259713 2004-09-07
PCT/JP2005/016296 WO2006028070A1 (ja) 2004-09-07 2005-09-06 排気浄化装置

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US11/661,428 Abandoned US20080184698A1 (en) 2004-09-07 2005-09-06 Exhaust Emission Control Device

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US (1) US20080184698A1 (ja)
EP (1) EP1795720A4 (ja)
JP (1) JP2006077591A (ja)
WO (1) WO2006028070A1 (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110162347A1 (en) * 2010-07-30 2011-07-07 Ford Global Technologies, Llc Synergistic SCR / DOC Configurations for Lowering Diesel Emissions
US20170248060A1 (en) * 2014-08-27 2017-08-31 Toyota Jidosha Kabushiki Kaisha Exhaust purification system for internal combustion engine
US10598455B2 (en) 2015-09-29 2020-03-24 Plate Llc Magazine ammunition loader
USRE48124E1 (en) 2015-09-29 2020-07-28 Plate Llc Magazine loader

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007260618A (ja) * 2006-03-29 2007-10-11 Toyota Motor Corp 排ガス浄化触媒及び排ガス浄化装置
JP4671048B2 (ja) * 2006-11-17 2011-04-13 三菱自動車工業株式会社 排気浄化装置
DE102007008954B4 (de) * 2007-02-21 2009-12-17 Umicore Ag & Co. Kg Katalysatorsystem und seine Verwendung
JP2009057922A (ja) * 2007-08-31 2009-03-19 Honda Motor Co Ltd 排ガス浄化装置
JP5277891B2 (ja) * 2008-11-17 2013-08-28 三菱自動車工業株式会社 排気浄化装置
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