JPH068605B2 - Nitrogen oxide treatment device in engine exhaust - Google Patents
Nitrogen oxide treatment device in engine exhaustInfo
- Publication number
- JPH068605B2 JPH068605B2 JP2454189A JP2454189A JPH068605B2 JP H068605 B2 JPH068605 B2 JP H068605B2 JP 2454189 A JP2454189 A JP 2454189A JP 2454189 A JP2454189 A JP 2454189A JP H068605 B2 JPH068605 B2 JP H068605B2
- Authority
- JP
- Japan
- Prior art keywords
- ammonia
- exhaust
- nitrogen
- exhaust gas
- engine
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
-
- 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
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、エンジン、好適にはディーゼルエンジンの排
気中の窒素酸化物（以下、ＮＯｘという）を車両上で処
理する装置に関する。Description: TECHNICAL FIELD The present invention relates to a device for treating nitrogen oxides (hereinafter, referred to as NO x ) in exhaust gas of an engine, preferably a diesel engine, on a vehicle.
一般に、ガソリンエンジン排気中のＮＯｘ処理は、その
排気を触媒床に導入することにより、通常行われている
が、車両用ディーゼルエンジンの場合には、排気中の酸
素量が多いために触媒が使用できず、専ら燃焼改善によ
り排気中のＮＯｘを低減させている。Generally, the NO x treatment in the exhaust gas of a gasoline engine is usually carried out by introducing the exhaust gas into the catalyst bed. However, in the case of a diesel engine for a vehicle, the amount of oxygen in the exhaust gas is large, and therefore the catalyst is exhausted. It can not be used, and exclusively reduce the NO x in the exhaust by combustion improvement.
一方、定置用ボイラーおよびディーゼルエンジンの分野
においては、排気中のＮＯｘ処理にあたって、ＮＯｘ処
理触媒床にディーゼルエンジンの排気と共にアンモニア
ボンベからアンモニアを導入させ、下記反応によりＮＯ
ｘを還元処理する方式（ＳＣＲ法）が採用されている。On the other hand, in the field of stationary boilers and diesel engines, when NO x treatment in the exhaust, NO x treatment catalyst bed ammonia is introduced from the ammonia cylinder together with the exhaust of a diesel engine, NO by the following reactions
A method of reducing x (SCR method) is adopted.
2NH3＋2NO＋(1/2) Ｏ２＝2N2＋3H2O 〔発明が解決しようとする課題〕 しかしながら、上記従来の定置用ボイラおよびディーゼ
ルエンジン排気中のＮＯｘ処理方式では、アンモニアボ
ンベを定期的に充填、或いは交換をしなければならない
という問題を有しており、重量、メンテナンス等の点で
車両用としては不向きであり、実用化には到っていな
い。一方、従来のアンモニア製造方法は、大規模設備を
用い高圧下で製造するものであり、しかもガス精製に冷
凍方法を使用するなど、車両に搭載することが困難であ
る。2NH 3 ＋ 2NO ＋ (1/2) O 2 ＝ 2N 2 ＋ 3H 2 O [Problems to be solved by the invention] However, in the conventional stationary boiler and the NO x treatment method in the exhaust of the diesel engine, the ammonia cylinder is periodically used. However, it is not suitable for a vehicle in terms of weight, maintenance, etc. and has not been put into practical use. On the other hand, the conventional ammonia production method uses a large-scale facility and is produced under high pressure, and it is difficult to mount it on a vehicle, for example, by using a refrigeration method for gas purification.
この問題を解決するために、本出願人は、特願昭６３−
１４２４０１号により、燃料と空気から水素と窒素を生
成しこれを原料として車両上でアンモニア合成を行い、
排気ガス中の窒素酸化物を選択還元する触媒床に前記ア
ンモニアを導入する窒素酸化物処理システムを出願して
いる。In order to solve this problem, the present applicant has filed Japanese Patent Application No. 63-
No. 142401 produces hydrogen and nitrogen from fuel and air and uses them as raw materials to synthesize ammonia on vehicles,
A patent application has been filed for a nitrogen oxide treatment system in which the ammonia is introduced into a catalyst bed that selectively reduces nitrogen oxides in exhaust gas.
上記システムにおいては、エンジン排気中のＮＯｘを還
元する場合、アンモニアの量が多すぎるとアンモニアそ
のものが大気に放出されて公害となり、一方、アンモニ
アの量が少なすぎるとＮＯｘが十分に低減されないこと
になるから、必然的にアンモニアの量はＮＯｘ量に比例
して供給することになる。In the above system, when reducing NO x in the engine exhaust, if the amount of ammonia is too large, ammonia itself is released into the atmosphere and becomes pollution, while if the amount of ammonia is too small, NO x is not sufficiently reduced. Therefore, the amount of ammonia is inevitably supplied in proportion to the amount of NO x .
しかし、ＮＯｘとアンモニアの反応は、触媒の温度分
布、エンジンの運転条件の変化によって安定せず、触媒
の中でアンモニアの吸着、放出が繰り返されることにな
る。すなわち、触媒の温度分布は、触媒床の下流側が上
流側よりも低いので、アンモニアの吸着量は触媒床の下
流側で多くなり、その部分が飽和状態に達するとアンモ
ニアが大気中に放出されてしまうという問題を有してい
る。However, the reaction between NO x and ammonia is not stable due to changes in catalyst temperature distribution and engine operating conditions, and ammonia is repeatedly adsorbed and released in the catalyst. That is, since the temperature distribution of the catalyst is lower on the downstream side of the catalyst bed than on the upstream side, the adsorption amount of ammonia increases on the downstream side of the catalyst bed, and when that part reaches saturation, ammonia is released into the atmosphere. It has the problem of being lost.
本発明は上記問題を解決するものであって、触媒装置中
の排気の流れを下流側と上流側とで切り換えることによ
り、効率的にＮＯｘを還元し、かつ、アンモニアの大気
への放出を防止することを目的とする。The present invention solves the above-mentioned problem, and by switching the flow of exhaust gas in the catalyst device between the downstream side and the upstream side, NO x is efficiently reduced and ammonia is released to the atmosphere. The purpose is to prevent.
この目的を達成するために、本発明は、燃料と空気から
水素と窒素を生成しこれを原料として車両上でアンモニ
ア合成を行い、排気ガス中の窒素酸化物を選択還元する
触媒装置に前記アンモニアを導入する窒素酸化物処理装
置において、前記触媒装置の出入口に開閉弁を設け、該
開閉弁を切換えることにより前記触媒装置内の排気の流
れ方向を逆転可能にすることを特徴とするものである。In order to achieve this object, the present invention provides a catalyst device for producing hydrogen and nitrogen from fuel and air, performing ammonia synthesis on a vehicle using these as raw materials, and selectively reducing nitrogen oxides in exhaust gas. In the nitrogen oxide treatment apparatus for introducing the above, an opening / closing valve is provided at the inlet / outlet port of the catalyst device, and by switching the opening / closing valve, the flow direction of exhaust gas in the catalyst device can be reversed. .
ところで、車両上でアンモニアを合成するためには、
窒素があること、水素があること、ＣＯ濃度が少な
いこと、高圧で反応させることが必要である。このう
ち、窒素は空気中の窒素を利用し、水素は軽油(Cn
H2n)を空気により部分酸化して水素を発生させ、ＣＯ
濃度を減少させるため、水素分離膜を利用してＣＯを除
去し、高圧で反応させるためには加圧ポンプを使用す
ることにより実現するものである。By the way, in order to synthesize ammonia on the vehicle,
It is necessary to have nitrogen, hydrogen, low CO concentration, and high pressure reaction. Of these, nitrogen is the nitrogen in the air, and hydrogen is light oil (C n
H 2n ) is partially oxidized by air to generate hydrogen, and CO
In order to reduce the concentration, CO is removed using a hydrogen separation membrane, and in order to react at high pressure, a pressure pump is used.
燃料を空気により部分酸化した反応生成ガスは、一酸化
炭素、水素、窒素等からなるが、アンモニア合成原料で
ある水素、および窒素を反応生成ガスから分離する手段
として、例えば芳香族ポリイミド製水素分離膜を使用す
ることにより、好適に部分酸化反応ガスから分離するこ
とができるので、車両上においてもアンモニア合成を行
うことを可能とするものである。The reaction product gas obtained by partially oxidizing the fuel with air consists of carbon monoxide, hydrogen, nitrogen, etc., but as a means for separating hydrogen, which is a raw material for ammonia synthesis, and nitrogen from the reaction product gas, for example, aromatic polyimide hydrogen separation By using the membrane, it is possible to preferably separate from the partial oxidation reaction gas, so that it is possible to perform ammonia synthesis even on a vehicle.
以下、図面を参照しつつ実施例を説明する。 Hereinafter, embodiments will be described with reference to the drawings.
第１図は本発明のエンジン排気中の窒素酸化物処理装置
の１実施例を示す断面図、第２図は本発明が適用される
エンジン排気中の窒素酸化物処理システムの１実施例を
示す構成図である。FIG. 1 is a cross-sectional view showing an embodiment of a nitrogen oxide treating apparatus for engine exhaust according to the present invention, and FIG. 2 shows an embodiment of a nitrogen oxide treating system for engine exhaust to which the present invention is applied. It is a block diagram.
第２図において、１０はディーゼルエンジン、１１は軽
油タンク、１２はバルブ、１３は接触分解反応器、２１
は水素分離膜、１４はコンプレッサーエアタンク、１５
は酸化反応器、１６はアンモニア合成反応器、２２は生
成したアンモニアを吸着脱離するための固体酸槽、１７
はアンモニアボンベ、１８は濃度センサ、１９はバル
ブ、２０はＮＯｘ処理用触媒床を示す。In FIG. 2, 10 is a diesel engine, 11 is a light oil tank, 12 is a valve, 13 is a catalytic cracking reactor, 21
Is a hydrogen separation membrane, 14 is a compressor air tank, 15
Is an oxidation reactor, 16 is an ammonia synthesis reactor, 22 is a solid acid tank for adsorbing and desorbing the produced ammonia, 17
Is an ammonia cylinder, 18 is a concentration sensor, 19 is a valve, and 20 is a catalyst bed for NO x treatment.
ディーゼルエンジン１０の燃料である軽油タンク１１か
ら軽油をバルブ１２を経て、適宜の加熱手段を設けた接
触分解反応器１３へ導入すると共に、８気圧程度に保た
れたブレーキ用コンプレッサーエアタンク１４から高圧
空気を導入して軽油を接触分解反応を行わせ、水素、軽
沸点炭化水素、窒素、酸素を排出する。Light oil is introduced from a diesel oil tank 11 which is a fuel of the diesel engine 10 through a valve 12 into a catalytic cracking reactor 13 provided with an appropriate heating means, and a high pressure air is supplied from a brake compressor air tank 14 maintained at about 8 atm. Is introduced to cause catalytic cracking reaction of light oil, and hydrogen, light boiling hydrocarbons, nitrogen and oxygen are discharged.
次に水素分離膜２１で分離した水素とエアタンク１４か
らの窒素、酸素を酸化反応器１５に導入して分解ガス中
の酸素を除去させ、次いで窒素、水素を含有するガスを
アンモニア合成反応器１６に導入してアンモニアとし、
生成したアンモニアを固体酸槽２２で分離してアンモニ
アボンベ１７に貯蔵する。アンモニア合成反応器１６に
おいて、未反応の窒素、水素は再びアンモニア合成反応
器１６に循環させる。Next, hydrogen separated from the hydrogen separation membrane 21 and nitrogen and oxygen from the air tank 14 are introduced into the oxidation reactor 15 to remove oxygen in the decomposed gas, and then the gas containing nitrogen and hydrogen is mixed into the ammonia synthesis reactor 16 And introduce it into ammonia,
The produced ammonia is separated in the solid acid tank 22 and stored in the ammonia cylinder 17. In the ammonia synthesis reactor 16, unreacted nitrogen and hydrogen are circulated again to the ammonia synthesis reactor 16.
そして、センサ１８によりディーゼルエンジン排気中の
ＮＯｘ濃度を検出し、電子制御装置２８の制御に基づい
てその濃度に応じてバルブ１９をフィードバツク制御
し、アンモニアボンベ１７から所定量のアンモニアを排
気ガス中に混合し、ＮＯｘ処理触媒床２０によりＮＯｘ
を分解して排気する。なお、エンジン回転数および負荷
を検出してバルブ１９を制御するようにしてもよい。一
方、水素分離膜２１で分離された軽沸点炭化水素は、エ
ンジン吸気管内に導入され、シリンダ内にて先立ち燃焼
を行う。これにより排気黒煙の低減も図られる。Then, the sensor 18 detects the NO x concentration in the exhaust gas of the diesel engine, and the valve 19 is feed-back controlled according to the concentration under the control of the electronic control unit 28 so that a predetermined amount of ammonia is discharged from the ammonia cylinder 17 into the exhaust gas. mixed in by NO x treatment catalyst bed 20 NO x
Disassemble and exhaust. The valve 19 may be controlled by detecting the engine speed and the load. On the other hand, the light boiling point hydrocarbon separated by the hydrogen separation membrane 21 is introduced into the engine intake pipe and burns in advance in the cylinder. As a result, the amount of exhaust black smoke can be reduced.
次に第１図により本発明のエンジン排気中の窒素酸化物
処理装置の１実施例について説明する。Next, one embodiment of a device for treating nitrogen oxides in engine exhaust according to the present invention will be described with reference to FIG.
前記ＮＯｘ処理触媒装置２０は、ハウジング３０内に配
設され、該ハウジング３０は、排気上流管３１と排気下
流管３２の間に接続されている。触媒装置２０とハウジ
ング３０の間には、空気流路３３が設けられ、触媒装置
２０には図で上下方向に排気ガスの出入口３５ａ、３５
ｂが形成されている。そして、出入口３５ａ、３５ｂに
対向して開閉弁３６、３７が回転自在に設置されてい
る。The NO x treatment catalyst device 20 is arranged in a housing 30, and the housing 30 is connected between an exhaust upstream pipe 31 and an exhaust downstream pipe 32. An air flow path 33 is provided between the catalyst device 20 and the housing 30, and the catalyst device 20 has exhaust gas inlets / outlets 35a, 35 in the vertical direction in the figure.
b is formed. On-off valves 36 and 37 are rotatably installed so as to face the inlets and outlets 35a and 35b.
第３図は本発明の他の実施例を示している。上記実施例
と相違する点は、開閉弁３６、３７をソレノイドバルブ
３９、４０により摺動して開閉することにより、排気ガ
スの出入口３５ａ、３５ｂを開閉する点である。FIG. 3 shows another embodiment of the present invention. The difference from the above embodiment is that the opening / closing valves 36, 37 are slidably opened / closed by solenoid valves 39, 40 to open / close the exhaust gas inlet / outlets 35a, 35b.
次に上記構成からなる窒素酸化物処理装置の作用につい
て説明すると、先ず当初は、開閉弁３６、３７は図示す
る如く実線の位置にあり、排気上流管３１からハウジン
グ３０に流入する排気ガスおよびアンモニアは、触媒装
置２０内を実線矢印の如く出入口３５ａ、３５ｂの方向
に流れ排気下流管３２から排出される。所定時間後、電
子制御装置２８の制御に基づいて、開閉弁３６、３７は
図示する如く点線の位置に切換えられ、排気上流管３１
からハウジング３０に流入する排気ガスおよびアンモニ
アは、触媒装置２０内を点線矢印の如く出入口３５ｂ、
３５ａの方向に流れ排気下流管３２から排出される。以
下、この切換制御を繰り返す。Next, the operation of the nitrogen oxide processing apparatus having the above structure will be described. First, the opening / closing valves 36 and 37 are at the positions shown by the solid lines as shown in the drawing, and the exhaust gas and the ammonia flowing from the exhaust upstream pipe 31 into the housing 30 are discharged. Flows in the catalyst device 20 in the direction of the inlets / outlets 35a and 35b as indicated by solid arrows and is discharged from the exhaust downstream pipe 32. After a predetermined time, the open / close valves 36 and 37 are switched to the positions indicated by the dotted lines as shown in the figure under the control of the electronic control unit 28, and the exhaust upstream pipe 31
Exhaust gas and ammonia flowing into the housing 30 from the inside of the catalyst device 20 are exposed to the inlet / outlet port 35b as indicated by a dotted arrow.
35a and discharged from the exhaust downstream pipe 32. Hereinafter, this switching control is repeated.
なお、本発明は上記実施例に限定されるものではなく種
々の変更が可能である。The present invention is not limited to the above embodiment, and various modifications can be made.
例えば、上記実施例においては、所定時間毎に電子制御
装置２８の制御に基づいて、開閉弁３６、３７を切換え
ているが、排気下流管３２にアンモニア濃度センサを設
け、アンモニア濃度が所定値以上になった場合に開閉弁
３６、３７を切換えてもよい。また、時間とアンモニア
濃度とを組み合わせて切換制御するようにしてもよい。For example, in the above embodiment, the on-off valves 36 and 37 are switched based on the control of the electronic control unit 28 every predetermined time, but an ammonia concentration sensor is provided in the exhaust downstream pipe 32 so that the ammonia concentration is equal to or higher than a predetermined value. The open / close valves 36 and 37 may be switched when the above condition occurs. Alternatively, switching control may be performed by combining time and ammonia concentration.
以上、本発明を車両用ディーゼルエンジンの排気の場合
について説明したが、ガソリンエンジン、メタノールエ
ンジンおよび水素エンジンの排気にも適用しうる。この
場合には、軽油の代わりにガソリン、メタノール、水素
を原料としてアンモニアを合成する。Although the present invention has been described above with respect to the case of exhaust from a vehicle diesel engine, it can also be applied to the exhaust from a gasoline engine, a methanol engine and a hydrogen engine. In this case, ammonia is synthesized using gasoline, methanol and hydrogen as raw materials instead of light oil.
以上のように本発明によれば、アンモニアの吸着量が触
媒装置２０内の下流側で多くなり、その部分が飽和状態
に達しても、開閉弁３６、３７が切換えられるため、触
媒装置２０内の排気下流側が上流側になり、効率的にＮ
Ｏｘを還元し、かつ、アンモニアの大気への放出を防止
することができる。As described above, according to the present invention, the opening / closing valves 36 and 37 are switched even if the amount of adsorbed ammonia increases on the downstream side in the catalyst device 20 and the part reaches a saturated state. The exhaust gas downstream side becomes the upstream side, and the N
It is possible to reduce O x and prevent ammonia from being released into the atmosphere.
第１図は本発明のエンジン排気中の窒素酸化物処理装置
の１実施例を示す断面図、第２図は本発明が適用される
エンジン排気中の窒素酸化物処理システムの１実施例を
示す構成図、第３図は本発明の他の実施例を示す断面図
である。 １０…エンジン、２０…ＮＯｘ処理用触媒装置、３１…
排気上流管、３２…排気下流管、３３…空気流路、３５
ａ、３５ｂ…出入口、３６、３７…開閉弁。FIG. 1 is a cross-sectional view showing an embodiment of a nitrogen oxide treating apparatus for engine exhaust according to the present invention, and FIG. 2 shows an embodiment of a nitrogen oxide treating system for engine exhaust to which the present invention is applied. FIG. 3 is a sectional view showing another embodiment of the present invention. 10 ... engine, 20 ... NO x catalyst for treating device 31 ...
Exhaust gas upstream pipe, 32 ... Exhaust gas downstream pipe, 33 ... Air flow path, 35
a, 35b ... gateway, 36, 37 ... on-off valve.
Claims (1)
原料として車両上でアンモニア合成を行い、排気ガス中
の窒素酸化物を選択還元する触媒装置に前記アンモニア
を導入する窒素酸化物処理装置において、前記触媒装置
の出入口に開閉弁を設け、該開閉弁を切換えることによ
り前記触媒装置内の排気の流れ方向を逆転可能にするこ
とを特徴とするエンジン排気中の窒素酸化物処理装置。1. A nitrogen oxide treatment in which hydrogen and nitrogen are produced from fuel and air, ammonia is synthesized on a vehicle using these as raw materials, and the ammonia is introduced into a catalyst device for selectively reducing nitrogen oxides in exhaust gas. In the apparatus, an on-off valve is provided at an inlet / outlet port of the catalyst device, and by switching the on-off valve, a flow direction of exhaust gas in the catalyst device can be reversed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2454189A JPH068605B2 (en) | 1989-02-02 | 1989-02-02 | Nitrogen oxide treatment device in engine exhaust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2454189A JPH068605B2 (en) | 1989-02-02 | 1989-02-02 | Nitrogen oxide treatment device in engine exhaust |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02204613A JPH02204613A (en) | 1990-08-14 |
| JPH068605B2 true JPH068605B2 (en) | 1994-02-02 |
Family
ID=12141011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2454189A Expired - Lifetime JPH068605B2 (en) | 1989-02-02 | 1989-02-02 | Nitrogen oxide treatment device in engine exhaust |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH068605B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2852057B1 (en) * | 2003-03-06 | 2007-05-11 | Bosch Gmbh Robert | VEHICLE EQUIPPED WITH AN EXHAUST GAS TREATMENT DEVICE |
| US20050025692A1 (en) * | 2003-05-05 | 2005-02-03 | Eaton Corporation (Jk) | Methods and apparatus for small-scale synthesis of ammonia |
| DE102016120928B4 (en) * | 2016-11-03 | 2022-09-29 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | SCR catalytic converter and method for operating an SCR catalytic converter |
-
1989
- 1989-02-02 JP JP2454189A patent/JPH068605B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02204613A (en) | 1990-08-14 |
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