JPS59134311A - Exhaust emission control device for diesel engine - Google Patents

Exhaust emission control device for diesel engine

Info

Publication number
JPS59134311A
JPS59134311A JP58006589A JP658983A JPS59134311A JP S59134311 A JPS59134311 A JP S59134311A JP 58006589 A JP58006589 A JP 58006589A JP 658983 A JP658983 A JP 658983A JP S59134311 A JPS59134311 A JP S59134311A
Authority
JP
Japan
Prior art keywords
wash coat
catalyzer
sulfur trioxide
exhaust gas
wash
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.)
Pending
Application number
JP58006589A
Other languages
Japanese (ja)
Inventor
Kenji Hori
堀　健次
Katsuyuki Tsuji
勝之 辻
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Motors Corp
Original Assignee
Mitsubishi Motors Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Motors Corp filed Critical Mitsubishi Motors Corp
Priority to JP58006589A priority Critical patent/JPS59134311A/en
Publication of JPS59134311A publication Critical patent/JPS59134311A/en
Pending legal-status Critical Current

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
    • F01N3/0807—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
    • B01D53/34—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
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/12—Combinations of different methods of purification absorption or adsorption, and catalytic conversion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

PURPOSE:To aim at improvements in the durability of a device, by supporting a catalyzer on a catalyst carrier whose inner part is porous via both of a first layer excellent in sulfur trioxide adsorption and a second layer excellent in sulfur trioxide resistance each, in case of the exhaust emission control device capable of reducing pollution substances in exhaust gas. CONSTITUTION:A first wash coat 1 consisting of alumina being high in capacity for adsorbing sulfur trioxide SO3 is applied to a catalyst carrier 3 whose inner part is porous, and in addition, thereupon a second wash coat 2 consisting of zirconia or titania resistible to sulfur trioxide SO3 is applied to, whereby a catalyzer 4 is held on the second wash coat 2. When exhaust gas flows in an arrow direction, it contacts the catalyzer 4 and these first and second wash coats 1 and 2 but the catalyzer 4 is supported by the second wash coat 2 being strongly resistible to SO3 so that degradation in the catalyzer due to the adsorption of SO3 can be thus prevented.

Description

【発明の詳細な説明】 本発明はガス特に排気ガス中に含まれている煙および他
の有害成分の浄化に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the purification of smoke and other harmful components contained in gases, particularly exhaust gases.

ディーゼル排気ガスを触媒で浄化する時間順となるのは
、燃料に入っている硫黄Ｓが燃焼して２酸化硫黄ＳＯ２
となシ、このＳＯ２が触媒で３酸化硫黄ＳＯ３と酸化さ
れ、さらにこのＳ０６が排気中の水分と化合し硫酸ドロ
ップレットＨ２ＳＯ４となって排出されたシ、あるいは
ウォッシュコートに吸着されこのウォッシュコートを駄
目にし、触媒性能を劣化させる欠点があった。なお現状
では、Ｓ０３におかされに〈〈またＳＯ３の吸着能力の
高いウォッシュコートはない。The time order in which diesel exhaust gas is purified by a catalyst is that the sulfur S contained in the fuel burns and converts to sulfur dioxide SO2.
This SO2 is oxidized to sulfur trioxide SO3 by the catalyst, and this S06 is further combined with moisture in the exhaust gas and is discharged as sulfuric acid droplets H2SO4, or it is adsorbed to the washcoat and the washcoat is It had the disadvantage of causing damage and deteriorating catalyst performance. At present, there is no wash coat that has a high adsorption capacity for SO3.

本発明の目的は、前記欠点を解消し、Ｓ０３の吸着によ
る触媒の劣化を防止するとともに、内部のウォッシュコ
ートで積極的にＳ０３を吸着し、ＳＯ３の排出を低く押
え浄化装置の耐久性の向上をはったディーゼルエンノン
の排ガス浄化装置を提供するにある。The purpose of the present invention is to eliminate the above-mentioned drawbacks, prevent deterioration of the catalyst due to adsorption of S03, actively adsorb S03 with an internal wash coat, keep SO3 emissions low, and improve the durability of the purification device. We provide exhaust gas purification equipment for diesel engines with high performance.

本発明に係るディーゼルエンジンの排ガス浄化装置は、
内側のポーラスな触媒担体よシ順次外方にＳＯ３吸着能
力の高い第１ウオツシーコートと、Ｓ０３におかされな
い第２ウオツシユコートとを付着させ、さらにその外方
に触媒を担持して構成され、排気ガスが大気中に放・出
される前に触媒や第１第２ウオツシーコートと接触し前
記目的を達成するようにしたものである。The diesel engine exhaust gas purification device according to the present invention includes:
A first wash coat having a high SO3 adsorption capacity and a second wash coat that is not affected by S03 are sequentially attached to the outside of the inner porous catalyst carrier, and a catalyst is further supported on the outside. The above purpose is achieved by bringing the exhaust gas into contact with the catalyst and the first and second wash coats before being released into the atmosphere.

以下本発明の一実施例を添付図面に基づいて説明する。An embodiment of the present invention will be described below based on the accompanying drawings.

図で左端のポーラスな触媒担体３上にはＳ０３を吸着す
る能力の高いアルミナよシなる第１ウオツシユコート１
を付着させ、さらにその上にＳＯ３におかされないジル
コニア又はチタニアよシなる第２ウオツシユコート２を
付着させ、この第２ウオツシユコート２上に酸化触媒４
を担持している。On the porous catalyst carrier 3 at the left end in the figure is a first wash coat 1 made of alumina, which has a high ability to adsorb S03.
A second wash coat 2 made of zirconia or titania that is not exposed to SO3 is deposited thereon, and an oxidation catalyst 4 is deposited on this second wash coat 2.
is carried.

１、第２ウォッシュコート１，２と接触するが、触媒４
はＳＯ３におかされない第２ウオツシユコートに担持さ
れて込るのでＳ０３の吸着による触媒の劣化を防止する
とともに第１ウオツシーコートで積極的１’？：　ＳＯ
３を吸着させ、Ｓ０３の排出を低く押えることができる
。1, in contact with the second washcoat 1, 2, but with the catalyst 4
is supported on the second wash coat, which is not affected by SO3, thereby preventing deterioration of the catalyst due to adsorption of S03, and actively carrying out 1'? in the first wash coat. : SO
3 can be adsorbed and the discharge of S03 can be kept low.

なおウォッシュコートとは溶液状として担体に塗布し乾
燥させたものである。Note that a wash coat is a solution applied to a carrier and dried.

本発明によればポーラスな触媒担体上にＳ０３を吸着す
る能力の高い第１ウオツシユコートを付着させ、さらに
その上にＳ０３におかされない第２ウオツシユコートを
付着させ、この第２ウオツシユコート上に触媒を担持し
ており、排気ガスを触媒および第１．第２つ叶ッソユコ
ートと接触させるようにしたので、第２ウォ、シーコー
トに担持すれた触媒の劣化を防止するとともに、内部の
第１ウオツシユコートで積極的にＳＯ３を吸着し、ＳＯ
３の排出を低く押え排ガス浄化装置の耐久性を向上させ
ることができる。According to the present invention, a first wash coat having a high ability to adsorb S03 is deposited on a porous catalyst carrier, and a second wash coat that is not affected by S03 is further deposited thereon. A catalyst is supported on the top, and the exhaust gas is transferred to the catalyst and the first. Since the second wash coat is brought into contact with the soy coat, it prevents deterioration of the catalyst supported on the second wash coat and the first wash coat inside actively adsorbs SO3.
The durability of the exhaust gas purification device can be improved by keeping the emissions of No. 3 low.

【図面の簡単な説明】[Brief explanation of the drawing]

図は本発明に係るディーゼルエンジンの排ガス浄化装置
に使用している触媒の構成図である。 ■・・・第１ウオツシユコート、２・・・第２ウオツシ
ーコート、３・・・ポーラスな触媒担体、４・・・触媒
。 にThe figure is a configuration diagram of a catalyst used in the exhaust gas purification device for a diesel engine according to the present invention. ■...First wash coat, 2...Second wash coat, 3...Porous catalyst carrier, 4...Catalyst. to

Claims (1)

【特許請求の範囲】[Claims] 排ガスに含まれる汚染物質を減少させる装置を有するも
のにおいて、内側に設けられた、°ポーラスな触媒担体
と、との担体上に付着させた３酸化硫黄吸着能力の高い
第１ウオツシユコートと、この第１ウオツシユコートの
さらに外側に付着させた３酸化硫黄におかされない第２
ウオツシーコートと、この第２ウオツシーコート上に担
持された触媒とを有してなるディーゼルエンジンの排ガ
ス浄化装置。In the apparatus for reducing pollutants contained in exhaust gas, a first wash coat having a high sulfur trioxide adsorption capacity and deposited on the porous catalyst carrier provided inside; A second wash coat, which is not affected by sulfur trioxide, is attached to the outside of the first wash coat.
An exhaust gas purification device for a diesel engine comprising a wash coat and a catalyst supported on the second wash coat.
JP58006589A 1983-01-20 1983-01-20 Exhaust emission control device for diesel engine Pending JPS59134311A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58006589A JPS59134311A (en) 1983-01-20 1983-01-20 Exhaust emission control device for diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58006589A JPS59134311A (en) 1983-01-20 1983-01-20 Exhaust emission control device for diesel engine

Publications (1)

Publication Number Publication Date
JPS59134311A true JPS59134311A (en) 1984-08-02

Family

ID=11642515

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58006589A Pending JPS59134311A (en) 1983-01-20 1983-01-20 Exhaust emission control device for diesel engine

Country Status (1)

Country Link
JP (1) JPS59134311A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6426316B2 (en) 1996-08-13 2002-07-30 Toyota Jidosha Kabushiki Kaisha Exhaust emission control catalyst for diesel engines
WO2015065735A1 (en) * 2013-10-28 2015-05-07 Cummins Inc. Selectively trapping and storing so3 in an exhaust gas effluent

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6426316B2 (en) 1996-08-13 2002-07-30 Toyota Jidosha Kabushiki Kaisha Exhaust emission control catalyst for diesel engines
WO2015065735A1 (en) * 2013-10-28 2015-05-07 Cummins Inc. Selectively trapping and storing so3 in an exhaust gas effluent
US9181888B2 (en) 2013-10-28 2015-11-10 Cummins Inc. Selectively trapping and storing SO3 in an exhaust gas effluent

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