JP6887284B2 - 排ガス浄化システム - Google Patents
排ガス浄化システム Download PDFInfo
- Publication number
- JP6887284B2 JP6887284B2 JP2017066628A JP2017066628A JP6887284B2 JP 6887284 B2 JP6887284 B2 JP 6887284B2 JP 2017066628 A JP2017066628 A JP 2017066628A JP 2017066628 A JP2017066628 A JP 2017066628A JP 6887284 B2 JP6887284 B2 JP 6887284B2
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- JP
- Japan
- Prior art keywords
- exhaust gas
- catalyst
- gas purification
- air
- 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.)
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- 238000000746 purification Methods 0.000 title claims description 113
- 239000007789 gas Substances 0.000 claims description 188
- 239000003054 catalyst Substances 0.000 claims description 164
- 239000000446 fuel Substances 0.000 claims description 47
- 230000001965 increasing effect Effects 0.000 claims description 46
- 238000002485 combustion reaction Methods 0.000 claims description 33
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 24
- 229910052760 oxygen Inorganic materials 0.000 claims description 24
- 239000001301 oxygen Substances 0.000 claims description 24
- 239000010948 rhodium Substances 0.000 claims description 11
- 239000011232 storage material Substances 0.000 claims description 10
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 9
- 229910052733 gallium Inorganic materials 0.000 claims description 7
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 7
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims description 6
- 229910052703 rhodium Inorganic materials 0.000 claims description 6
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 25
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 24
- 238000006243 chemical reaction Methods 0.000 description 14
- 239000000567 combustion gas Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 13
- 239000000203 mixture Substances 0.000 description 13
- 230000003197 catalytic effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 229930195733 hydrocarbon Natural products 0.000 description 6
- 150000002430 hydrocarbons Chemical class 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 229910017604 nitric acid Inorganic materials 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 2
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical class O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- -1 TiO 2 Chemical class 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 125000000218 acetic acid group Chemical class C(C)(=O)* 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000010789 controlled waste Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 229910001657 ferrierite group Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
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- 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
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- 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]
- B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
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- F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
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- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/04—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using kinetic energy
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0223—Variable control of the intake valves only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/06—Cutting-out cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
-
- 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
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- Exhaust Gas After Treatment (AREA)
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- Output Control And Ontrol Of Special Type Engine (AREA)
Description
(2)NO2+炭化水素 → N2+CO2+H2O …式(2)
(3)炭化水素+O2 → CO2+H2O …式(3)
したがって、式(2)の反応よりも式(3)の反応を促進させれば、NOxの浄化率を高くすることができると考えられる。そのためには、式(1)の反応を促進することが重要である。
第一の触媒元素量が0.5重量%よりも少ない場合、式(1)及び式(2)の反応が進行しにくく、NOxが充分に浄化されない可能性がある。20重量%より多くても、第一の触媒元素の表面露出量が低下する、もしくは第一の触媒元素による第二の触媒元素の被覆が生じ、触媒活性が充分に発現しない可能性がある。
Al2O3粉末及びAl2O3の前駆体からなり硝酸酸性に調整したスラリーをコージェライト製ハニカム(400セル/inc2)にコーティングした後、乾燥焼成して、ハニカムの見掛けの容積1リットルあたり170gのAl2O3をコーティングしたAl2O3コートハニカムを得た。該Al2O3コートハニカムに触媒成分として硝酸Ga溶液を含浸した後、120℃で乾燥、続いて600℃で1時間焼成した。
÷触媒に流入したNOx量×100 …式(4)
C3H6浄化率(%)=(触媒に流入したC3H6量−触媒から流出したC3H6量)
÷触媒に流入したC3H6量×100 …式(5)
含浸成分として硝酸Ga溶液に加えて硝酸Rh溶液を用いた以外は、実施例1と同様の操作により、Al2O3に対して元素換算でGa10重量%、Rh0.61重量%を含有する実施例触媒2を得た。得られた触媒に対して、実施例1と同様の方法で排ガス浄化性能試験を行った。
含浸成分として硝酸Ga溶液の代わりに硝酸Rh溶液を用いた以外は、実施例1と同様の操作により、Al2O3に対して元素換算でRh0.61重量%を含有する比較例触媒1を得た。得られた触媒に対して、実施例1と同様の方法で、モデルガスのO2濃度を3、10%として排ガス浄化性能試験を行った。
実施例触媒1、2及び比較例触媒1のNOx浄化率の結果を表1〜3及び図7に示す。実施例触媒1及び2に関しては、触媒流入ガスのO2濃度を増加させるとNOx浄化活性が高くなる。一方、比較例触媒1ではO2濃度を増加させると活性が低下する。以上の結果より、触媒活性成分としてGaを含む実施例触媒1及び2では、O2濃度増加によりNOx浄化活性が向上することが分かる。この理由としては、O2によるNOからNO2への酸化反応が促進され、C3H6によるNO2の浄化反応が促進されたためと考えられる。
図2に示したエンジンシステムにおいて、ECU28により空燃比が高くなるように制御することで、シリンダ18内に導入する燃料と空気の混合気中の空気の割合、つまりO2濃度を高めることができる。従って、本システムの排ガス浄化触媒11に実施例触媒1を備えると、排ガス浄化活性が向上する。
図2に示したエンジンシステムにおいて、吸気バルブ23及び排気バルブ24を同時に開弁して一部の気筒のシリンダ18内に空気を導入し、排気管27内で燃焼後ガス41と空気を混合させることで、触媒流入ガス42のO2濃度を高めることができる。従って、本システムの排ガス浄化触媒11に実施例触媒1を備えると、排ガス浄化活性が向上する。
図2に示したエンジンシステムにおいて、吸気バルブ23のみを開弁してシリンダ18内に空気を導入した後に排気バルブ24を開弁して排気管27に空気を排出し、排気管27内で燃焼後ガス41と空気を混合させることで、触媒流入ガス42のO2濃度を高めることができる。従って、本システムの排ガス浄化触媒11に実施例触媒1を備えると、排ガス浄化活性が向上する。
図2及び3に示したエンジンシステムにおいて、シリンダ18内に空気を導入する気筒Bの吸気及び排気時期を気筒B’のように変更することで、燃焼後ガス41及び空気の排気管27への排出を同時にすることができる。従って、排気管27内で燃焼後ガス41と空気が混合しやすくなり、触媒流入ガス42のO2濃度を効率良く高めることができるため、本システムの排ガス浄化触媒11に実施例触媒1を備えると、排ガス浄化活性が向上する。
図2及び4に示したエンジンシステムにおいて、一部の気筒のシリンダ18内に空気を導入し、吸気、圧縮、膨張、排気の4行程の代わりに吸気、排気の2行程を1サイクルに2回繰り返すことで、燃焼後ガス41及び空気の排気管27への排出を同時にすることができる。従って、排気管27内で燃焼後ガス41と空気が混合しやすくなり、触媒流入ガス42のO2濃度を効率良く高めることができるため、本システムの排ガス浄化触媒11に実施例触媒1を備えると、排ガス浄化活性が向上する。
図2及び5に示したエンジンシステムにおいて、一部もしくは全部の気筒でシリンダ18内に燃料と空気の混合気を導入して吸気、圧縮、膨張、排気の4行程を行った後、シリンダ18内に空気を導入して吸気、排気を行う6行程とし、排気管27内で燃焼後ガスと空気を混合させることで、触媒流入ガス42のO2濃度を高めることができる。従って、本システムの排ガス浄化触媒11に実施例触媒1を備えると、排ガス浄化活性が向上する。
図2及び6に示したエンジンシステムにおいて、O2濃度増加装置43として二次空気導入装置を用い、排気管27に空気を導入して燃焼後ガス41と混合させることで、触媒流入ガス42のO2濃度を高めることができる。従って、本システムの排ガス浄化触媒11に実施例触媒1を備えると、排ガス浄化活性が向上する。
実施例9において、過給機を用いることで、排気管27内の圧力が高くても触媒流入ガス42のO2濃度を高めることができる。
図2及び6に示したエンジンシステムにおいて、O2濃度増加装置43にO2貯蔵材を備え、燃料カットの際にO2濃度増加装置43へ流入する空気中のO2をO2貯蔵材に貯蔵し、燃焼後ガス41が流入した際にO2貯蔵材からO2を放出することで、触媒流入ガス42のO2濃度を高めることができる。従って、本システムの排ガス浄化触媒11に実施例触媒1を備えると、排ガス浄化活性が向上する。
実施例4において、排ガス浄化触媒11の前段にオゾナイザを設けると、O2からオゾンが生成し触媒流入ガス42に添加されることに加え、触媒流入ガス42のオゾン濃度を高めることができる。オゾンはO2よりも酸化力が強いため、排ガス浄化活性が更に向上する。
図2に示したエンジンシステムにおいて、排ガス浄化触媒11に実施例触媒1を備え、触媒流入ガス42のO2濃度及び温度を制御するシステムを設けると、触媒流入ガス42のO2濃度が5%かつ温度が400℃の状態から、O2濃度を20%かつ温度を500℃とすることができるため、表1から分かるようにNOx浄化率が4.9%から49.8%に向上する。
2 第二の触媒
3 担体
4 基材
11 排ガス浄化触媒
12 エアフローセンサ
13 過給機
13a コンプレッサ
13b タービン
14 インタークーラ
15 吸気管
16 電子制御スロットル
17 吸気圧力センサ
18 シリンダ
19 インジェクタ
20 ピストン
21 点火プラグ
22 バルブタイミング機構
23 吸気バルブ
24 排気バルブ
25 ウェイストゲート弁
26 空燃比センサ
27 排気管
28 ECU
29 アクセル開度センサ
30 EGR管
31 EGRクーラ
32 EGR弁
33 差圧センサ
34 EGR温度センサ
41 燃焼後ガス
42 触媒流入ガス
43 O2濃度増加装置
Claims (8)
- 酸化アルミニウムを含む担体と、前記担体に設けられる触媒を備え、内燃機関と繋がる排ガス浄化装置と、前記排ガス浄化装置と接続され、酸素濃度を高めるシステムと、を有する排ガス浄化システムにおいて、
前記触媒はガリウムを含む第一の触媒を有し、前記第一の触媒の元素量は前記酸化アルミニウムに対して0.5〜20重量%であり、
前記酸素濃度を高めるシステムは、前記内燃機関の燃焼後ガスの酸素濃度よりも高い酸素濃度にし、かつ前記触媒に流入するガスの酸素濃度を10%以上とし、
前記触媒は更にロジウムを含む第二の触媒を有し、前記第二の触媒の元素量は前記酸化アルミニウムに対して2重量%以下であることを特徴とする排ガス浄化システム。 - 請求項1に記載の排ガス浄化システムおいて、
前記酸素濃度を高めるシステムは、内燃機関から排出される排ガスとは別に酸素を含むガスを前記触媒に供給することを特徴とする排ガス浄化システム。 - 請求項2に記載の排ガス浄化システムにおいて、
前記酸素濃度を高めるシステムは、過給機を有することを特徴とする排ガス浄化システム。 - 請求項1に記載の排ガス浄化システムにおいて、
前記内燃機関は、燃料を燃焼させない少なくとも一つの気筒を有することを特徴とする排ガス浄化システム。 - 請求項1に記載の排ガス浄化システムにおいて、
前記内燃機関は、燃焼行程の後に空気を流通させて吸気を行う吸気行程と、当該吸気行程の直後に排気行程を有することを特徴とする排ガス浄化システム。 - 請求項1に記載の排ガス浄化システムにおいて、
前記酸素濃度を高めるシステムは、酸素貯蔵材料を有することを特徴とする排ガス浄化システム。 - 請求項1乃至6の何れかに記載の排ガス浄化システムにおいて、
前記排ガス浄化装置に、オゾンを添加する装置を有することを特徴とする排ガス浄化システム。 - 請求項1乃至7の何れかに記載の排ガス浄化システムにおいて、
更に前記内燃機関の燃焼後ガスの温度を制御する装置を有することを特徴とする排ガス浄化システム。
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CA2060229A1 (en) * | 1991-02-05 | 1992-08-06 | Toshiaki Hayasaka | Exhaust gas purifying catalyst and an exhaust gas purifying method using the catalyst |
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US6348430B1 (en) * | 1997-06-20 | 2002-02-19 | Degussa Ag | Exhaust gas treatment catalyst for internal combustion engines with two catalytically active layers on a carrier structure |
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JP2006200414A (ja) * | 2005-01-19 | 2006-08-03 | Nissan Motor Co Ltd | 内燃機関の排気温度制御装置 |
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