JP2009144587A - 排ガス浄化装置 - Google Patents
排ガス浄化装置 Download PDFInfo
- Publication number
- JP2009144587A JP2009144587A JP2007322241A JP2007322241A JP2009144587A JP 2009144587 A JP2009144587 A JP 2009144587A JP 2007322241 A JP2007322241 A JP 2007322241A JP 2007322241 A JP2007322241 A JP 2007322241A JP 2009144587 A JP2009144587 A JP 2009144587A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst layer
- exhaust gas
- catalyst
- downstream
- upstream
- 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.)
- Granted
Links
Images
Classifications
-
- 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
- B01D53/9463—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 one brick
- B01D53/9472—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 one brick in different zones
-
- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- 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
- B01D53/9463—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 one brick
- B01D53/9468—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 one brick in different layers
-
- 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
- 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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
-
- 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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—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
- 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
- F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
- F01N3/106—Auxiliary oxidation catalysts
-
- 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
- F01N3/18—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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/208—Hydrocarbons
-
- 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
- B01D2255/10—Noble metals or compounds thereof
- B01D2255/102—Platinum group metals
- B01D2255/1025—Rhodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/204—Alkaline earth metals
- B01D2255/2042—Barium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/902—Multilayered catalyst
- B01D2255/9022—Two layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/903—Multi-zoned catalysts
- B01D2255/9032—Two zones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/91—NOx-storage component incorporated in the catalyst
-
- 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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/30—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a fuel reformer
-
- 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
- F01N2510/00—Surface coverings
- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Toxicology (AREA)
- Analytical Chemistry (AREA)
- Biomedical Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Ceramic Engineering (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
【解決手段】ウォールフロー方式であるハニカム担持体5の内部に、流入側セル5aと流出側セル5bとが形成されている。流入側セル5aと流出側セル5bとを隔てている多孔質壁5cにおいて、流入側セル5aに面する側の表面である上流側表面5d上には上流側触媒層7が形成されている。一方、流出側セル5bに面する側の表面である下流側表面5e上には下流側触媒層8が形成されている。上流側触媒層7は改質触媒によって形成されており、軽油と排ガス中の酸素及び水蒸気とを反応させて軽油を改質し、一酸化炭素、水素、炭化水素を生成する。下流側触媒層8はNOx吸蔵還元触媒によって形成されており、上流側触媒層7が生成した一酸化炭素、水素、炭化水素を還元剤として、排ガス中のNOxを窒素に還元する。
【選択図】図4
Description
実施の形態1.
図1に、この実施の形態1に係る排ガス浄化装置の構成を示す。
ディーゼルエンジン1のシリンダヘッド1aには、ディーゼルエンジン1内に吸気を導入する吸気マニフォルド1bと、ディーゼルエンジン1の排ガスを外部に排出する排気マニフォルド1cとが接続されている。排気マニフォルド1cには排気管2が接続されており、ディーゼルエンジン1から排出された排ガスは、図1の矢印Aで示される方向に流通する。排気管2の途中には、排気管2の外部から内部に貫通するインジェクタ3が設けられている。インジェクタ3は、燃料通路4を介して図示しない燃料タンクに接続されており、燃料タンク内に貯められた燃料である軽油を排気管2内に噴射する。
図1に戻って、ハニカム担持体5の下流側には、選択還元触媒9が接続されている。選択還元触媒9は、排ガス中に含まれるNOxを、下流側触媒層8を形成するNOx吸蔵還元触媒が生成したアンモニアと反応させて窒素に還元する。
まず、インジェクタ3が軽油を噴射しておらず、ハニカム担持体5内に流入する排ガスがリーン状態である場合の動作について説明する。
図1に示すように、ディーゼルエンジン1から排出された排ガスは、排気マニフォルド1c、排気管2を通ってハニカム担持体5内に流入する。ハニカム担持体5内に流入した排ガスは、まずハニカム担持体5の流入側セル5a(図4参照)内に流入し、上流側触媒層7、多孔質壁5c、下流側触媒層8を順次通過して流出側セル5b内に流入する。ここで、インジェクタ3は軽油を噴射していないため、多孔質壁5cの上流側表面5d上において、上流側触媒層7を形成する改質触媒は反応を起こさない。
インジェクタ3が排気管2内に軽油を噴射すると、排ガスと軽油との混合ガスが、ハニカム担持体5の多孔質壁5c(図4参照)を通過するようになり、多孔質壁5cの上流側表面5d上で上流側触媒層7を形成する改質触媒に軽油が供給される。改質触媒は、供給された軽油と排ガス中に含まれる酸素、水蒸気とを反応させ、下流側触媒層8を形成するNOx吸蔵還元触媒の還元成分である一酸化炭素、水素、炭化水素を生成する。ここで、多孔質壁5cを形成する多孔質のセラミックは、上流側触媒層7を形成する改質触媒より大きい流路抵抗を有しているため、上流側触媒層7を通過した軽油が多孔質壁5cの上流側表面5dと上流側触媒層7との間に長時間滞留し、改質触媒における反応効率が向上する。
次に、この発明の実施の形態2に係る排ガス浄化装置について説明する。この実施の形態2に係る排ガス浄化装置は、実施の形態1に対して、上流側触媒層及び下流側触媒層を形成する触媒の種類を、それぞれ酸化触媒、改質触媒としたものである。尚、以下の実施の形態において、図1〜5の参照符号と同一の符号は、同一または同様な構成要素であるので、その詳細な説明は省略する。
図6に、この実施の形態2に係る排ガス浄化装置の構成を示す。図6の矢印Aで示される方向におけるインジェクタ3の下流側には、ハニカム担持体5が接続されており、その下流側には、NOx吸蔵還元触媒19、選択還元触媒9が順次接続されている。NOx吸蔵還元触媒19は、実施の形態1において下流側触媒層8を形成したNOx吸蔵還元触媒と同様の触媒である。
まず、インジェクタ3が軽油を噴射していない場合における排ガス浄化装置の動作について説明する。
図7に示すように、ハニカム担持体5内に流入した排ガスは、まずハニカム担持体5の流入側セル5a内に流入し、上流側触媒層17、多孔質壁5c、下流側触媒層18を順次通過して流出側セル5b内に流入する。ここで、排ガス中に含まれるPMは、図8に示すように、上流側触媒層17を形成する酸化触媒上に捕集され、捕集されたPMは、酸化触媒の作用によって燃焼して除去される。また、PMが燃焼する際に生じた熱は、多孔質壁5cを介して下流側触媒層18に伝達され、下流側触媒層18を形成する改質触媒が加熱される。
インジェクタ3が排気管2内に軽油を噴射すると、排ガスと軽油との混合ガスが、ハニカム担持体5の多孔質壁5cを通過するようになる。多孔質壁5cを通過する混合ガスに含まれる軽油の一部は、未燃の状態で上流側触媒層17を通過し、下流側触媒層18に達する。下流側触媒層18を形成する改質触媒は、実施の形態1の上流側触媒層7における反応と同様に、未燃の軽油と排ガス中に含まれる酸素、水蒸気とを反応させ、NOx吸蔵還元触媒19の還元成分である一酸化炭素、水素、炭化水素を生成する。
Claims (3)
- 多孔質壁によって隔てられた流入側セル及び流出側セルを内部に有し、
前記流入側セル内に流入した排ガスが、前記多孔質壁を通過して前記流出側セル内に流入する、ウォールフロー方式のハニカム担持体と、
前記ハニカム担持体に燃料を供給するインジェクタと
を備える排ガス浄化装置において、
前記多孔質壁の、前記流入側セルに面する上流側表面には上流側触媒層が、前記流出側セルに面する下流側表面には下流側触媒層がそれぞれ形成され、
前記上流側触媒層と前記下流側触媒層とは、互いに異なる作用を有する触媒によって形成され、
前記上流側触媒層及び前記下流側触媒層のうち、いずれか一方は前記燃料を改質して還元成分を生成する改質触媒によって形成されることを特徴とする排ガス浄化装置。 - 前記上流側触媒層は、前記燃料を改質して還元成分を生成する改質触媒によって形成され、
前記下流側触媒層は、前記改質触媒が生成した前記還元成分により、排ガス中に含まれる窒素酸化物を窒素に還元するNOx吸蔵還元触媒によって形成される請求項1に記載の排ガス浄化装置。 - 前記上流側触媒層は、前記排ガス中に含まれる粒子状物質を燃焼させる酸化触媒によって形成され、
前記下流側触媒層は、前記燃料を改質して還元成分を生成する改質触媒によって形成される請求項1に記載の排ガス浄化装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007322241A JP4631902B2 (ja) | 2007-12-13 | 2007-12-13 | 排ガス浄化装置 |
US12/331,089 US20090151340A1 (en) | 2007-12-13 | 2008-12-09 | Exhaust gas purification device |
EP08171176A EP2070580A2 (en) | 2007-12-13 | 2008-12-10 | Exhaust gas purification device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007322241A JP4631902B2 (ja) | 2007-12-13 | 2007-12-13 | 排ガス浄化装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2009144587A true JP2009144587A (ja) | 2009-07-02 |
JP4631902B2 JP4631902B2 (ja) | 2011-02-16 |
Family
ID=40276190
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2007322241A Expired - Fee Related JP4631902B2 (ja) | 2007-12-13 | 2007-12-13 | 排ガス浄化装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US20090151340A1 (ja) |
EP (1) | EP2070580A2 (ja) |
JP (1) | JP4631902B2 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010138783A (ja) * | 2008-12-11 | 2010-06-24 | Shin Ace:Kk | 内燃機関の後処理装置及び排気ガス浄化装置及びそれを用いた排気ガス浄化方法 |
JP2011111924A (ja) * | 2009-11-25 | 2011-06-09 | Hino Motors Ltd | エンジンの排ガス浄化装置 |
KR20140045393A (ko) * | 2011-05-13 | 2014-04-16 | 바스프 에스이 | 층상 구조의 촉매화된 매연 필터 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11187127B2 (en) | 2019-06-28 | 2021-11-30 | Deere & Company | Exhaust gas treatment system and method with four-way catalyzed filter element |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002188435A (ja) * | 2000-10-12 | 2002-07-05 | Toyota Motor Corp | 排ガス浄化フィルタ |
JP2004019498A (ja) * | 2002-06-13 | 2004-01-22 | Toyota Motor Corp | 排ガス浄化フィルタ触媒 |
JP2005500147A (ja) * | 1999-08-13 | 2005-01-06 | ジョンソン、マッセイ、パブリック、リミテッド、カンパニー | 触媒ウォールフローフィルタ |
JP2005146975A (ja) * | 2003-11-14 | 2005-06-09 | Toyota Motor Corp | パティキュレートフィルタ |
JP2005264868A (ja) * | 2004-03-19 | 2005-09-29 | Toyota Motor Corp | ディーゼル排ガス浄化装置 |
JP2006207524A (ja) * | 2005-01-31 | 2006-08-10 | Isuzu Motors Ltd | 排気ガス浄化装置の昇温方法及び排気ガス浄化システム |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4742405B2 (ja) * | 2000-06-28 | 2011-08-10 | トヨタ自動車株式会社 | 燃料改質装置 |
US7119044B2 (en) * | 2003-06-11 | 2006-10-10 | Delphi Technologies, Inc. | Multiple washcoats on filter substrate |
JP4586614B2 (ja) | 2005-04-11 | 2010-11-24 | トヨタ自動車株式会社 | ディーゼル排ガス浄化装置及びディーゼル排ガス浄化用触媒 |
US20080072575A1 (en) * | 2006-09-21 | 2008-03-27 | Eaton Corporation | Catalyst to improve low temperature deNOx activity in a reformer-LNT exhaust aftertreatment system |
KR100836367B1 (ko) * | 2006-11-21 | 2008-06-09 | 현대자동차주식회사 | 디젤엔진의 입자상물질과 질소산화물 저감을 위한 정화장치 |
-
2007
- 2007-12-13 JP JP2007322241A patent/JP4631902B2/ja not_active Expired - Fee Related
-
2008
- 2008-12-09 US US12/331,089 patent/US20090151340A1/en not_active Abandoned
- 2008-12-10 EP EP08171176A patent/EP2070580A2/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005500147A (ja) * | 1999-08-13 | 2005-01-06 | ジョンソン、マッセイ、パブリック、リミテッド、カンパニー | 触媒ウォールフローフィルタ |
JP2002188435A (ja) * | 2000-10-12 | 2002-07-05 | Toyota Motor Corp | 排ガス浄化フィルタ |
JP2004019498A (ja) * | 2002-06-13 | 2004-01-22 | Toyota Motor Corp | 排ガス浄化フィルタ触媒 |
JP2005146975A (ja) * | 2003-11-14 | 2005-06-09 | Toyota Motor Corp | パティキュレートフィルタ |
JP2005264868A (ja) * | 2004-03-19 | 2005-09-29 | Toyota Motor Corp | ディーゼル排ガス浄化装置 |
JP2006207524A (ja) * | 2005-01-31 | 2006-08-10 | Isuzu Motors Ltd | 排気ガス浄化装置の昇温方法及び排気ガス浄化システム |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010138783A (ja) * | 2008-12-11 | 2010-06-24 | Shin Ace:Kk | 内燃機関の後処理装置及び排気ガス浄化装置及びそれを用いた排気ガス浄化方法 |
JP2011111924A (ja) * | 2009-11-25 | 2011-06-09 | Hino Motors Ltd | エンジンの排ガス浄化装置 |
KR20140045393A (ko) * | 2011-05-13 | 2014-04-16 | 바스프 에스이 | 층상 구조의 촉매화된 매연 필터 |
JP2014519404A (ja) * | 2011-05-13 | 2014-08-14 | ビーエーエスエフ ソシエタス・ヨーロピア | 積層型デザインの触媒担持すすフィルター |
KR101980392B1 (ko) | 2011-05-13 | 2019-05-20 | 바스프 에스이 | 층상 구조의 촉매화된 매연 필터 |
Also Published As
Publication number | Publication date |
---|---|
US20090151340A1 (en) | 2009-06-18 |
JP4631902B2 (ja) | 2011-02-16 |
EP2070580A2 (en) | 2009-06-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6955042B1 (en) | CPO regenerated lean NOx trap with no moving parts | |
US7584603B2 (en) | Method and system for regenerating NOx adsorbers and/or particulate filters | |
JP5141900B2 (ja) | 排気浄化装置 | |
US20070180819A1 (en) | Process and system for improving combustion and exhaust aftertreatment of motor vehicle engines | |
JP2007152336A (ja) | 内燃機関の排気浄化装置 | |
JP2009115064A (ja) | 排ガス浄化装置 | |
JP2011052611A (ja) | 排気ガス浄化装置 | |
JP2010209905A (ja) | 窒素酸化物低減触媒及びこれを利用した排気装置 | |
JP5600422B2 (ja) | 排気システム | |
JP4631902B2 (ja) | 排ガス浄化装置 | |
JP3545712B2 (ja) | 排気浄化装置 | |
JP3885814B2 (ja) | 排気ガス浄化装置の昇温方法及び排気ガス浄化システム | |
JP2020045860A (ja) | 排ガス浄化装置 | |
JP2007198315A (ja) | 内燃機関の排気浄化装置及び排気浄化方法 | |
JP2011033017A (ja) | 排気システム | |
JP2011033001A (ja) | 排気ガス浄化装置 | |
US10041391B2 (en) | Apparatus for purifying exhaust gas | |
JP2011058478A (ja) | 還元剤供給装置、それを備える排気浄化システム及び還元剤の供給方法 | |
JP2005127260A (ja) | 内燃機関の排気浄化装置 | |
JP2006316654A (ja) | 排気浄化装置 | |
JP5228832B2 (ja) | 排気ガス浄化システム及び排気ガス浄化方法 | |
JP2010031778A (ja) | 排気浄化装置 | |
JP2006207394A (ja) | NOx浄化装置 | |
JP2014062501A (ja) | 排気ガス浄化装置 | |
JP2020045861A (ja) | 排ガス浄化装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20091203 |
|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20100402 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20100406 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20100603 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20101019 |
|
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20101101 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20131126 Year of fee payment: 3 |
|
LAPS | Cancellation because of no payment of annual fees |