JP2605553B2 - 内燃機関の排気浄化装置 - Google Patents
内燃機関の排気浄化装置Info
- Publication number
- JP2605553B2 JP2605553B2 JP4208090A JP20809092A JP2605553B2 JP 2605553 B2 JP2605553 B2 JP 2605553B2 JP 4208090 A JP4208090 A JP 4208090A JP 20809092 A JP20809092 A JP 20809092A JP 2605553 B2 JP2605553 B2 JP 2605553B2
- Authority
- JP
- Japan
- Prior art keywords
- nox
- absorbent
- exhaust gas
- air
- sulfur
- 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.)
- Expired - Lifetime
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-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—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
- F01N3/085—Sulfur or sulfur oxides
-
- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/04—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 by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0454—Controlling adsorption
-
- 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
- B01D53/8637—Simultaneously removing sulfur oxides and nitrogen oxides
-
- 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
- B01D53/9422—Processes characterised by a specific catalyst for removing nitrogen oxides by NOx storage or reduction by cyclic switching between lean and rich exhaust gases (LNT, NSC, NSR)
-
- 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
- B01D53/9495—Controlling the catalytic process
-
- 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
-
- 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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
-
- 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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
-
- 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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0285—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a SOx trap or adsorbent
-
- 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
- B01D2255/20—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
- B01D2255/20—Metals or compounds thereof
- B01D2255/204—Alkaline earth metals
- B01D2255/2045—Calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/206—Rare earth metals
- B01D2255/2061—Yttrium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/206—Rare earth metals
- B01D2255/2063—Lanthanum
-
- 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
- F01N2240/18—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 an adsorber or absorber
-
- 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
- F01N2570/04—Sulfur or sulfur 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- Exhaust Gas After Treatment (AREA)
Description
に関する。
内燃機関において、流入排気ガスの空燃比がリーンのと
きにはNOxを吸収し、流入排気ガス中の酸素濃度が低
下すると吸収したNOxを放出するNOx吸収剤を機関
排気通路内に配置し、リーン混合気を燃焼せしめた際に
発生するNOxをNOx吸収剤により吸収し、NOx吸
収剤のNOx吸収能力が飽和する前にNOx吸収剤への
流入排気ガスの空燃比を一時的にリッチにしてNOx吸
収剤からNOxを放出させると共に放出されたNOxを
還元するようにした内燃機関が本出願人により既に提案
されている(特願平3−284095号参照)。
関の潤滑油内にはイオウが含まれているので排気ガス中
にはイオウが含まれており、このイオウもNOxと共に
NOx吸収剤に吸収される。しかしながらこのイオウは
NOx吸収剤への流入排気ガスの空燃比をリッチにして
もNOx吸収剤から放出されず、従ってNOx吸収剤内
のイオウの量は次第に増大することになる。ところがN
Ox吸収剤内のイオウの量が増大するとNOx吸収剤が
吸収しうるNOxの量が次第に低下し、ついにはNOx
吸収剤がNOxをほとんど吸収できなくなるという問題
を生ずる。
めに本発明によれば、リーン混合気を燃焼せしめるよう
にした内燃機関において、流入排気ガスの空燃比がリー
ンのときにはNOxを吸収し、流入排気ガス中の酸素濃
度が低下すると吸収したNOxを放出するNOx吸収剤
を機関排気通路内に配置し、このNOx吸収剤上流の機
関排気通路内にイオウ捕獲装置を設けている。
より捕獲され、従ってNOx吸収剤にはNOxのみが吸
収される。
トン、3は燃焼室、4は点火栓、5は吸気弁、6は吸気
ポート、7は排気弁、8は排気ポートを夫々示す。吸気
ポート6は対応する枝管9を介してサージタンク(図示
せず)に連結され、各枝管9には夫々吸気ポート6内に
向けて燃料を噴射する燃料噴射弁10が取付けられる。
一方、排気ポート8は排気マニホルド11および排気管
12を介してイオウ捕獲装置13に連結され、このイオ
ウ捕獲装置13は排気管14を介してNOx吸収剤15
を内蔵したケーシング16に連結される。図1に示す内
燃機関では燃焼室3内に供給される混合気の空燃比はリ
ーンとされ、従って燃焼室3内ではリーン混合気が燃焼
せしめられることになる。
の代表的な成分の濃度を概略的に示している。図2から
わかるように燃焼室3から排出される排気ガス中の未燃
HC,COの量は燃焼室3内に供給される混合気の空燃
比がリッチになるほど増大し、燃焼室3から排出される
排気ガス中の酸素O2 の量は燃焼室3内に供給される混
合気の空燃比がリーンになるほど増大する。
吸収剤15は例えばアルミナを担体とし、この担体上に
例えばカリウムK、ナトリウムNa、リチウムLi、セ
シウムCsのようなアルカリ金属、バリウムBa、カル
シウムCaのようなアルカリ土類、ランタンLa、イッ
トリウムYのような希土類から選ばれた少くとも一つ
と、白金Ptのような貴金属とが担持されている。機関
吸気通路およびNOx吸収剤15上流の排気通路内に供
給された空気および燃料の比をNOx吸収剤15への流
入排気ガスの空燃比と称するとこのNOx吸収剤15は
流入排気ガスの空燃比がリーンのときにはNOxを吸収
し、流入排気ガス中の酸素濃度が低下すると吸収したN
Oxを放出するNOxの吸放出作用を行う。なお、NO
x吸収剤15上流の排気通路内に燃料或いは空気が供給
されない場合には流入排気ガスの空燃比は燃焼室3内に
供給される混合気の空燃比に一致し、従ってこの場合に
はNOx吸収剤15は燃焼室3内に供給される混合気の
空燃比がリーンのときにはNOxを吸収し、燃焼室3内
に供給される混合気中の酸素濃度が低下すると吸収した
NOxを放出することになる。
に配置すればこのNOx吸収剤15は実際にNOxの吸
放出作用を行うがこの吸放出作用の詳細なメカニズムに
ついては明らかでない部分もある。しかしながらこの吸
放出作用は図3に示すようなメカニズムで行われている
ものと考えられる。次にこのメカニズムについて担体上
に白金PtおよびバリウムBaを担持させた場合を例に
とって説明するが他の貴金属、アルカリ金属、アルカリ
土類、希土類を用いても同様なメカニズムとなる。
と流入排気ガス中の酸素濃度が大巾に増大し、図3
(A)に示されるようにこれら酸素O2 がO2 - の形で
白金Ptの表面に付着する。一方、流入排気ガス中のN
Oは白金Ptの表面上でO2 - と反応し、NO2 となる
(2NO+O2 →2NO2 )。次いで生成されたNO2
の一部は白金Pt上で更に酸化されつつ吸収剤内に吸収
されて酸化バリウムBaOと結合しながら、図3(A)
に示されるように硝酸イオンNO3 - の形で吸収剤内に
拡散する。このようにしてNOxがNOx吸収剤15内
に吸収される。
Ptの表面でNO2 が生成され、吸収剤のNOx吸収剤
能力が飽和しない限りNO2 が吸収剤内に吸収されて硝
酸イオンNO3 - が生成される。これに対して流入排気
ガス中の酸素濃度が低下してNO2 の生成量が低下する
と反応が逆方向(NO3 - →NO2 )に進み、斯くして
吸収剤内の硝酸イオンNO3 - がNO2 の形で吸収剤か
ら放出される。即ち、流入排気ガス中の酸素濃度が低下
するとNOx吸収剤15からNOxが放出されることに
なる。図2に示されるように流入排気ガスのリーンの度
合が低くなれば流入排気ガス中の酸素濃度が低下し、従
って流入排気ガスのリーンの度合を低くすればNOx吸
収剤15からNOxが放出されることになる。
リッチにすると図2に示されるように機関からは多量の
未燃HC,COが排出され、これら未燃HC,COは白
金Pt上の酸素O2 - と反応して酸化せしめられる。ま
た、流入排気ガスの空燃比をリッチにすると流入排気ガ
ス中の酸素濃度が極度に低下するために吸収剤からNO
2 が放出され、このNO2 は図3(B)に示されるよう
に未燃HC,COと反応して還元せしめられる。このよ
うにして白金Ptの表面上にNO2 が存在しなくなると
吸収剤から次から次へとNO2 が放出される。従って流
入排気ガスの空燃比をリッチにすると短時間のうちにN
Ox吸収剤15からNOxが放出されることになる。
になるとNOxがNOx吸収剤15に吸収され、流入排
気ガスの空燃比をリッチにするとNOxがNOx吸収剤
15から短時間のうちに放出される。従って図1に示す
内燃機関ではリーン混合気の燃焼期間が一定期間経過し
たときに機関シリンダ内に供給される混合気の空燃比を
一時的にリッチにしてNOx吸収剤15からNOxを放
出させるようにしている。
おり、NOx吸収剤15にはNOxばかりでなくイオウ
も吸収される。このNOx吸収剤15へのイオウの吸収
メカニズムはNOxの吸収メカニズムと同じであると考
えられる。即ち、NOxの吸収メカニズムを説明したと
きと同様に担体上に白金PtおよびバリウムBaを担持
させた場合を例にとって説明すると、前述したように流
入排気ガスの空燃比がリーンのときには酸素O2 がO2
- の形で白金Ptの表面に付着しており、流入排気ガス
中のSO2 は白金Ptの表面でO2 - と反応してSO3
となる。次いで生成されたSO3 の一部は白金Pt上で
更に酸化されつつ吸収剤内に吸収されて酸化バリウムB
aOと結合しながら、硫酸イオンSO4 2- の形で吸収剤
内に拡散し、硫酸塩BaSO4 を生成する。
しずらく、流入排気ガスの空燃比をリッチにしても硫酸
塩BaSO4 は分解されずにそのまま残る。従ってNO
x吸収剤15内には時間が経過するにつれて硫酸塩Ba
SO4 が増大することになり、斯くして時間が経過する
につれてNOx吸収剤15が吸収しうるNOx量が低下
することになる。
ンが流入しないように図1に示す如くNOx吸収剤15
上流の排気通路内にイオウ捕獲装置13を配置するよう
にしている。この場合、上述したようにNOx吸収剤1
5はイオウを吸収しかつ放出しないのでイオウ捕獲装置
13としてはNOx吸収剤15と同様な吸収剤を用いる
ことができる。図1に示す実施例ではイオウ捕獲装置1
3がイオウ吸収剤17と、イオウ吸収剤17を包囲する
ケーシング18とにより構成されており、このイオウ吸
収剤17は例えばアルミナを担体とし、この担体上に例
えばカリウムK、ナトリウムNa、リチウムLi、セシ
ウムCsのようなアルカリ金属、バリウムBa、カルシ
ウムCaのようなアルカリ土類、ランタンLa、イット
リウムYのような希土類から選ばれた少くとも一つと、
白金Ptのような貴金属とが担持されている。
xの吸放出作用について考慮する必要がなく、良好なイ
オウの捕獲だけについて考慮すればよいのでイオウ吸収
剤17に含まれる上述のアルカリ金属、アルカリ土類、
希土類の量はNOxの吸収剤15よりも多くすることが
好ましく、またイオウ吸着剤17にはセリウムCeを追
加することもできる。
排気通路内にイオウ吸収剤17を配置すると機関から排
出される全てのイオウはイオウ吸収剤17内に吸収さ
れ、このイオウは燃焼室3内に供給される混合気がリッ
チにされてもイオウ吸収剤17から放出されることはな
い。従ってNOx吸収剤15にはNOxのみが吸収され
ることになり、斯くしてNOx吸収剤15のNOx吸収
能力が低下するのを阻止することができることになる。
吸収剤の高いNOx吸収能力を維持することができる。
Oおよび酸素の濃度を概略的に示す線図である。
る。
Claims (1)
- 【請求項1】 リーン混合気を燃焼せしめるようにした
内燃機関において、流入排気ガスの空燃比がリーンのと
きにはNOxを吸収し、流入排気ガス中の酸素濃度が低
下すると吸収したNOxを放出するNOx吸収剤を機関
排気通路内に配置し、該NOx吸収剤上流の機関排気通
路内にイオウ捕獲装置を設けた内燃機関の排気ガス浄化
装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4208090A JP2605553B2 (ja) | 1992-08-04 | 1992-08-04 | 内燃機関の排気浄化装置 |
DE69331083T DE69331083T2 (de) | 1992-08-04 | 1993-07-30 | Vorrichtung zur Reinigung von Abgas eines Motors |
EP93112260A EP0582917B1 (en) | 1992-08-04 | 1993-07-30 | An exhaust gas purification device for an engine |
US08/340,438 US5472673A (en) | 1992-08-04 | 1994-11-14 | Exhaust gas purification device for an engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4208090A JP2605553B2 (ja) | 1992-08-04 | 1992-08-04 | 内燃機関の排気浄化装置 |
Publications (2)
Publication Number | Publication Date |
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JPH0658138A JPH0658138A (ja) | 1994-03-01 |
JP2605553B2 true JP2605553B2 (ja) | 1997-04-30 |
Family
ID=16550478
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Application Number | Title | Priority Date | Filing Date |
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JP4208090A Expired - Lifetime JP2605553B2 (ja) | 1992-08-04 | 1992-08-04 | 内燃機関の排気浄化装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US5472673A (ja) |
EP (1) | EP0582917B1 (ja) |
JP (1) | JP2605553B2 (ja) |
DE (1) | DE69331083T2 (ja) |
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-
1992
- 1992-08-04 JP JP4208090A patent/JP2605553B2/ja not_active Expired - Lifetime
-
1993
- 1993-07-30 DE DE69331083T patent/DE69331083T2/de not_active Expired - Lifetime
- 1993-07-30 EP EP93112260A patent/EP0582917B1/en not_active Expired - Lifetime
-
1994
- 1994-11-14 US US08/340,438 patent/US5472673A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0582917B1 (en) | 2001-11-07 |
DE69331083D1 (de) | 2001-12-13 |
JPH0658138A (ja) | 1994-03-01 |
US5472673A (en) | 1995-12-05 |
DE69331083T2 (de) | 2002-06-06 |
EP0582917A1 (en) | 1994-02-16 |
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