WO2017082563A1 - Catalyseur d'épuration des gaz d'échappement pour moteur à essence stœchiométrique - Google Patents

Catalyseur d'épuration des gaz d'échappement pour moteur à essence stœchiométrique Download PDF

Info

Publication number
WO2017082563A1
WO2017082563A1 PCT/KR2016/012351 KR2016012351W WO2017082563A1 WO 2017082563 A1 WO2017082563 A1 WO 2017082563A1 KR 2016012351 W KR2016012351 W KR 2016012351W WO 2017082563 A1 WO2017082563 A1 WO 2017082563A1
Authority
WO
WIPO (PCT)
Prior art keywords
catalyst
twc
exhaust gas
component
fuel
Prior art date
Application number
PCT/KR2016/012351
Other languages
English (en)
Korean (ko)
Inventor
한현식
나승철
송진우
이귀연
이준
Original Assignee
희성촉매 주식회사
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 희성촉매 주식회사 filed Critical 희성촉매 주식회사
Publication of WO2017082563A1 publication Critical patent/WO2017082563A1/fr

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to an exhaust purification catalyst, a purification method, and a catalyst structure for a stoichiometrically operated gasoline engine.
  • Catalysts are applied to the exhaust systems of automobiles to convert carbon monoxide, hydrocarbons and nitric oxides (NOx) emitted during operation of gasoline engines into more desirable gases.
  • NOx nitric oxides
  • the engine is operated under conditions of stoichiometric air / fuel ratio, i.e., A / F ratio of about 14.6, catalysts containing platinum, rhodium or palladium can effectively convert these three gases in unison (see FIG. 1).
  • TWC catalysts are versatile in that they can catalyze the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides substantially simultaneously.
  • Well-known ternary catalysts consist of a gamma-alumina porous support layer which supports a precious metal such as platinum, rhodium or palladium on a cordierite heat resistant substrate (also called a carrier).
  • Gasoline lean-GDI engines are one alternative for improving fuel efficiency, and the engines operate very sparsely in most duty cycles.
  • the A / F ratio is above 14.6 under these 'lean-burn' conditions and does not show sufficient purification efficiency for nitrogen oxides under a 'lean burn' atmosphere containing this excess of oxygen.
  • a catalyst and purification system has been developed that can effectively purify nitrogen oxides even in an atmosphere containing excess oxygen (see US Pat. No. 5,948,376), which provides a catalyst / purification system for exhaust gas purification under a high oxygen atmosphere. Are described).
  • gasoline lean burn engines only need a large number of systems, such as TWC modules for the oxidation of HC and CO, LNT modules for occluding NOx that cannot be purified because of their air-fuel ratio, or SCR for NOx purification.
  • TWC modules for the oxidation of HC and CO
  • LNT modules for occluding NOx that cannot be purified because of their air-fuel ratio
  • SCR for NOx purification
  • an object of the present invention is to provide a lean condition which is instantaneously generated due to fuel cut in a gasoline engine in which the air-fuel mixture is operated at stoichiometric air-to-raw ratio, i.e., a condition having an oxygen concentration above the stoichiometric amount in the exhaust gas. It is to provide a catalyst for purifying exhaust gas for treating nitrogen oxide generated in large quantities in the.
  • a three-way catalyst component and a NOx storage component loaded on a support are used in a gasoline engine to which a fuel cut is applied and the air-fuel mixture is operated at a stoichiometric air-raw ratio.
  • a catalyst module for exhaust gas purification is provided, comprising a catalyst, and (2) a ceramic carrier for supporting the catalyst.
  • the present invention also provides a method of contacting the exhaust gas from a gasoline engine, in which the air-fuel mixture is operated at a stoichiometric air-raw ratio, in contact with the catalyst for purifying exhaust gases of the present invention to provide monoxide.
  • most of the nitrogen oxides in the exhaust gas are adsorbed to the NOx storage component in an instant lean combustion atmosphere having an oxygen concentration above the stoichiometric amount required for the oxidizing component to be oxidized in the exhaust gas.
  • the adsorbed nitrogen oxides are released so that the oxygen concentration is lower than the stoichiometric amount. It is chemically reduced by reaction with hydrocarbons and carbon monoxide in the exhaust gas.
  • Figure 1 shows the conversion efficiency for the A / F of the gasoline vehicle.
  • FIG. 2 shows NOx emissions when a fuel cut is generated in a stoichiometrically operated gasoline engine.
  • FIG. 3 is a conceptual diagram of a TWC-NT according to the present invention.
  • Example 4 shows a TWC-NT catalyst double layer coating structure according to the present invention (Example 1).
  • FIG. 5 shows a TWC + TWC-NT catalyst double layer coating structure according to the present invention (Example 2).
  • FIG. 6 shows a TWC-NT + TWC catalyst double layer coating structure according to the present invention (Example 3).
  • FIG. 7 shows a catalyst (Example 4) in which the TWC layer is placed at the front end and the TWC-NT layer is placed at the rear end by zone coating.
  • FIG. 8 shows a catalyst (Example 5) in which the TWC-NT layer is placed at the front end and the TWC layer is placed at the rear end by zonal application.
  • FIG. 9 shows a catalyst (Example 6) in which a honeycomb structure coated with a TWC catalyst layer is disposed in a front brick, and a honeycomb structure coated with a TWC-NT catalyst layer is disposed in a rear brick. .
  • FIG. 10 shows a catalyst (Example 7) in which a honeycomb structure coated with a TWC-NT catalyst layer is disposed in a front brick, and a honeycomb structure coated with a TWC catalyst layer is placed in a rear brick.
  • FIG. 11 shows a catalyst (Example 9) in which a honeycomb structure coated with a TWC-NT catalyst layer is disposed on a front block and an honeycomb structure coated with an SCR catalyst layer is placed on a rear block (Example 9).
  • the present invention relates to a stacked catalyst composite (TWC-NT) incorporating a catalyst of the type commonly referred to as a three-way catalyst (TWC) and a nitrogen oxide adsorption component (NT).
  • TWC-NT stacked catalyst composite
  • the present invention is directed to large quantities in lean conditions which are instantaneously generated due to fuel cuts in gasoline engines in which the air-fuel mixture is operated at stoichiometric air-to-raw ratio, i.e., conditions having an oxygen concentration above the stoichiometric amount in the exhaust gas.
  • a stacked catalyst composite of three-way catalyst (TWC) and nitrogen oxide trap (NT) integration for treating the generated nitrogen oxides.
  • Fuel cuts are performed to achieve fuel efficiency in gasoline engines in which the air-fuel mixture is operated at stoichiometric air-to-raw ratios.
  • the fuel cut is directly related to fuel economy improvement, and as the application time / number of fuel cuts increases, it can contribute to fuel economy by reducing unnecessary fuel consumption. This will be described in detail.
  • the fuel cut starts when there is no need for much power, such as when the vehicle is downhill or when the vehicle decelerates, i.e., when the driver releases the accelerator pedal. At this time, the fuel supply is stopped by the engine and only the air in the atmosphere remains. The air / fuel ratio rises to over 100, and the catalyst exposed to air is converted into an oxidation state. When the power is needed again, the fuel cut ends and fuel is supplied to the engine again.
  • the ECU Electronic Control Unit
  • the ECU Electric Control Unit
  • the gas is supplied in excess, and the air-fuel ratio is rich (performance ratio ⁇ 14.6).
  • the fuel supply is determined based on the air-fuel ratio sensor at the end of the Manifold Catalytic Converter (MCC)
  • MCC Manifold Catalytic Converter
  • the Underfloor Catalytic Converter (UCC) catalyst which is affected by the exhaust gas passing through the MCC, still remains It is an oxidizing condition that is unfavorable for reduction, and thus it is not possible to purify a small amount of NOx that has passed through the MCC, and as a result, the amount of NOx emitted increases every time the fuel cut is taken.
  • the present invention proposes a method for removing a large amount of NOx emitted whenever a fuel cut is generated. Specifically, a combination of TWC and nitrogen oxide adsorption components (NT) is provided. That is, under the above conditions, TWC-NT (NOx Trap) located in UCC traps and stores NOx that cannot be purified because the catalyst is in an oxidized state, and then can be discharged and reduced when the air-fuel ratio of UCC is restored to 1.
  • . 2 shows a TWC-NT conceptual diagram of the present invention.
  • the TWC-NT configuration can be applied in the form of stacked catalyst composites or individual modules.
  • the multilayer catalyst composite of the present invention has a layer that adsorbs nitrogen oxides before or after the TWC catalyst layer.
  • the stacked catalyst composite of the present invention may be separately comprised of a TWC catalyst module and a nitrogen oxide adsorption module.
  • the multilayer catalyst composite of the present invention illustrates a composite having a layer for adsorbing nitrogen oxides after the TWC catalyst layer.
  • the terms 'catalyst' and 'catalyst module' are used interchangeably herein.
  • the catalyst is in a form in which the catalyst component (s) are supported on a support, and the catalyst module is understood as a structure in which the catalyst is laminated on a carrier.
  • Zone application as used herein means that two or more catalyst functions are implemented on one carrier by coating different catalysts either front or back in one carrier and are known coating methods for those skilled in the art.
  • a brick means a carrier unit.
  • the TWC-NT catalyst according to the present invention comprises a ternary catalyst component and a NOx storage component loaded on a single support or separate supports.
  • the three-way catalyst component includes a platinum component and an optional platinum group component other than platinum.
  • the NOx storage component comprises an optional NOx adsorbent component selected from the group consisting of platinum component, alkaline earth metal component, alkali metal component and rare earth metal component.
  • the optional platinum group metal component other than platinum may be selected from the group consisting of palladium, rhodium, ruthenium and iridium components.
  • the NOx adsorbent component may be selected from the group consisting of oxides of calcium, strontium and barium, oxides of potassium, sodium, lithium and cesium and oxides of cerium, lanthanum, praseodymium and neodymium.
  • the support is selected from the group consisting of silica, alumina and titania compounds.
  • the support is an activating compound selected from the group consisting of alumina, silica, silica-alumina, alumino-silicate, alumina-zirconia, alumina-chromia and alumina-ceria.
  • the TWC-NT catalyst according to the present invention may be stacked in a single layer or a double layer on a ceramic carrier to constitute a catalyst module.
  • one layer may have a layer made of TWC itself.
  • the TWC layer may be an upper layer or a lower layer.
  • the carrier may have an open or filter type structure.
  • the catalyst of the invention can be zone coated on a single carrier substrate such that the TWC-NT catalyst according to the invention can be applied at the front end (upstream) and the TWC catalyst can be applied at the rear end (downstream).
  • Exhaust gases comprising hydrocarbons, carbon monoxide and nitrogen oxides first meet the upstream zone and then the second zone.
  • the TWC-NT catalyst front or back bricks may be combined with the corresponding TWC catalyst front or back bricks.
  • the TWC-NT catalyst front or rear bleach can be combined with the SCR catalyst front or rear blick to form the catalyst system.
  • the present invention provides a method for removing NOx from exhaust gas of a gasoline engine in which the air-fuel mixture is operated at a stoichiometric air-raw ratio.
  • TWC-NT catalysts in three-way catalyst / NO x adsorption configurations accumulate NOx during momentary lean periods when fuel cuts occur, and release and reduce accumulated NOx during enrichment periods.
  • the three-way catalyst and the NOx adsorption component are mixed with a slurry, which is a support material, to form a washcoat that is then applied to a carrier.
  • the washcoat is applied to a carrier and then dried at high temperatures and calcined.
  • the TWC-NT catalyst will be described as being limited to the case where the three-way catalyst component and the NOx storage component are included in a separate support, but the three-way catalyst component and the NOx storage component may be supported on a single support.
  • 0.1 parts by weight of a palladium solution was dry impregnated to 90 parts by weight of an oxygen storage material (OSC).
  • OSC oxygen storage material
  • 90 parts by weight of alumina was dry impregnated with 0.8 parts by weight of platinum solution and 0.1 parts by weight of rhodium.
  • Two kinds of impregnated powders were stirred together with 20 parts by weight of barium-acetate and wet milled to prepare a slurry.
  • the slurry was then immersed in a ceramic honeycomb structure (105.7 * 115) having 400 number of cells per square inch (CPSI) and a wall thickness of 4.0 millimeters (105.7 * 115) and coated 100 parts by weight first, followed by drying at 120 ° C. for 4 hours. And calcined at 550 ° C.
  • the first coated honeycomb structure was immersed in the slurry again to coat 100 parts by weight, and then dried at 120 ° C. for 4 hours and calcined at 550 ° C. for 2 hours to complete the TWC-NT catalyst ( 4).
  • OSC oxygen storage material
  • alumina was dry impregnated with 0.4 parts by weight of platinum solution and 0.05 parts by weight of rhodium.
  • Two kinds of impregnated powders were stirred together with 10 parts by weight of barium-acetate and wet milled to prepare a slurry.
  • the slurry was first coated with a ceramic honeycomb structure (105.7 * 115) having 400 cells per square inch (CPSI) and a wall thickness of 4.0 millimeters, and dried at 120 ° C. for 4 hours, It was calcined at 550 ° C. for 2 hours.
  • CPSI cells per square inch
  • a palladium solution and 0.05 parts by weight of a rhodium solution were immersed in 60 parts by weight of an oxygen storage material (OSC) and 40 parts by weight of alumina, and then wet milled to prepare a slurry.
  • the honeycomb structure first coated on the slurry containing palladium and rhodium was immersed in a second coating, dried at 120 ° C. for 4 hours, and calcined at 550 ° C. for 2 hours to complete a TWC-NT catalyst ( 5).
  • the TWC-NT layer was configured as the top layer and the TWC layer was formed as the bottom layer (FIG. 6).
  • TWC; TWC-NT catalyst of Example 2 was coated on a honeycomb structure divided by Zone coating method, but the TWC catalyst was disposed at the front and the TWC-NT catalyst was arranged at the rear (FIG. 7).
  • the TWC catalyst was configured at the rear end and the TWC-NT catalyst at the front end (FIG. 8).
  • Each TWC; TWC-NT catalyst of Example 2 was divided into different honeycomb structures and composed of front and rear blocks respectively (FIG. 9).
  • TWC-NT catalyst was divided into different honeycomb structures and composed of rear and front blocks respectively (FIG. 10).
  • 0.1 parts by weight of a palladium solution was dry impregnated to 90 parts by weight of an oxygen storage material (OSC).
  • OSC oxygen storage material
  • 90 parts by weight of alumina was dry impregnated with 0.8 parts by weight of platinum solution and 0.1 parts by weight of rhodium.
  • Two kinds of impregnated powders were stirred together with 20 parts by weight of barium-acetate and wet milled to prepare a slurry.
  • the slurry was then coated with 100 parts by weight of GPF (Gasoline Particulate Filter) having 300 cells per square inch (CPSI) and a wall thickness of 8.0 millimeters, and then dried at 120 ° C. for 4 hours, and then dried at 550 ° C. for 2 hours. Firing over time completed the TWC-NT / GPF catalyst.
  • GPF Gasoline Particulate Filter
  • the SCR catalyst module was manufactured as follows. First, a zeolite containing Cu ions was wet milled to prepare a slurry. The slurry was then immersed in a ceramic honeycomb structure (105.7 * 115) having 400 cells per square inch (CPSI) and a wall thickness of 4.0 millimeters (105.7 * 115) to coat 100 parts by weight, and then dried at 120 ° C. for 4 hours, Firing at 550 ° C. for 2 hours to complete the SCR (Selective Catalytic Reduction) catalyst module, which was placed afterwards (FIG. 11).
  • a ceramic honeycomb structure (105.7 * 115) having 400 cells per square inch (CPSI) and a wall thickness of 4.0 millimeters (105.7 * 115) to coat 100 parts by weight, and then dried at 120 ° C. for 4 hours, Firing at 550 ° C. for 2 hours to complete the SCR (Selective Catalytic Reduction) catalyst module, which was placed afterwards (FIG. 11).
  • 0.9 parts by weight of a palladium solution and 0.1 parts by weight of a rhodium solution were supported by 120 parts by weight of an oxygen storage material (OSC) and 80 parts by weight of alumina, and then wet milled to prepare a slurry.
  • the slurry was immersed in a ceramic honeycomb structure (105.7 * 115) having 400 cells per square inch (CPSI) and a wall thickness of 4.0 millimeters (105.7 * 115) and coated 100 parts by weight first, followed by drying at 120 ° C. for 4 hours. And calcined at 550 ° C. for 2 hours. After firing, the first coated honeycomb structure was immersed in the slurry again to coat 100 parts by weight, and then dried at 120 ° C. for 4 hours and calcined at 550 ° C. for 2 hours to complete the TWC catalyst.
  • OSC oxygen storage material
  • TWC-NT catalyst and the TWC catalyst prepared in Example 1 and Comparative Example 1 were deteriorated in an engine bench deterioration mode corresponding to 160,000 km running of the vehicle, and then mounted on a mass-produced SULEV vehicle to evaluate exhaust gas purification performance.
  • TWC three-way catalyst of the same specification is installed at the MCC position, and TWC-NT catalyst and TWC catalyst are alternately mounted in UCC, and then operating in evaluation mode (FTP-75).
  • FTP-75 evaluation mode
  • Example 1 TWC-NT
  • Comparative Example 1 TWC
  • TWC-NT Comparative Example 1

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Catalysts (AREA)

Abstract

La présente invention concerne un composite de catalyseur en couches (TWC-NT), dans lequel sont intégrés un catalyseur d'un type couramment dénommé catalyseur à trois voies (TWC) et un composant d'adsorption d'oxyde d'azote (NT). En particulier, la présente invention concerne le composite de catalyseur en couches intégrant le catalyseur à trois voies (TWC) et un piège à oxydes d'azote (NT) permettant de traiter l'oxyde d'azote produit en grande quantité dans un état pauvre qui est momentanément créé en raison d'une coupure de carburant dans un moteur à essence dans lequel un mélange air-carburant réagit selon un rapport stœchiométrique air-ingrédient, en d'autres termes, dans un état ayant une concentration en oxygène d'au moins une quantité stœchiométrique dans les gaz d'échappement.
PCT/KR2016/012351 2015-11-10 2016-10-31 Catalyseur d'épuration des gaz d'échappement pour moteur à essence stœchiométrique WO2017082563A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2015-0157381 2015-11-10
KR20150157381 2015-11-10

Publications (1)

Publication Number Publication Date
WO2017082563A1 true WO2017082563A1 (fr) 2017-05-18

Family

ID=58695731

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2016/012351 WO2017082563A1 (fr) 2015-11-10 2016-10-31 Catalyseur d'épuration des gaz d'échappement pour moteur à essence stœchiométrique

Country Status (1)

Country Link
WO (1) WO2017082563A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190073187A (ko) * 2017-12-18 2019-06-26 현대자동차주식회사 가솔린 엔진의 배기시스템
CN112236214A (zh) * 2018-06-12 2021-01-15 巴斯夫公司 用于燃油切断NOx控制的TWC***
WO2023001617A1 (fr) * 2021-07-21 2023-01-26 Umicore Ag & Co. Kg Système d'épuration des gaz d'échappement pour épurer les gaz d'échappement de moteurs à combustion interne

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11247654A (ja) * 1998-03-04 1999-09-14 Nissan Motor Co Ltd ＮＯｘ吸蔵還元型三元触媒を使用した排気ガス浄化装置
KR20050013996A (ko) * 2002-05-24 2005-02-05 존슨 맛쎄이 퍼블릭 리미티드 컴파니 Ｎｏｘ 저장 성분을 갖는 3방향 촉매를 포함하는 스파크점화 엔진
KR101337934B1 (ko) * 2007-03-19 2013-12-09 우미코레 아게 운트 코 카게 이중층 삼원 촉매
KR101459439B1 (ko) * 2012-12-12 2014-11-07 현대자동차 주식회사 자동차 엔진의 촉매 장치 및 이를 구비한 배기 가스 정화 장치
WO2015135983A1 (fr) * 2014-03-13 2015-09-17 Umicore Ag & Co. Kg Système catalytique pour les moteurs à combustion interne à essence comprenant des catalyseurs trois voies et un catalyseur scr

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11247654A (ja) * 1998-03-04 1999-09-14 Nissan Motor Co Ltd ＮＯｘ吸蔵還元型三元触媒を使用した排気ガス浄化装置
KR20050013996A (ko) * 2002-05-24 2005-02-05 존슨 맛쎄이 퍼블릭 리미티드 컴파니 Ｎｏｘ 저장 성분을 갖는 3방향 촉매를 포함하는 스파크점화 엔진
KR101337934B1 (ko) * 2007-03-19 2013-12-09 우미코레 아게 운트 코 카게 이중층 삼원 촉매
KR101459439B1 (ko) * 2012-12-12 2014-11-07 현대자동차 주식회사 자동차 엔진의 촉매 장치 및 이를 구비한 배기 가스 정화 장치
WO2015135983A1 (fr) * 2014-03-13 2015-09-17 Umicore Ag & Co. Kg Système catalytique pour les moteurs à combustion interne à essence comprenant des catalyseurs trois voies et un catalyseur scr

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190073187A (ko) * 2017-12-18 2019-06-26 현대자동차주식회사 가솔린 엔진의 배기시스템
KR102394586B1 (ko) 2017-12-18 2022-05-04 현대자동차 주식회사 가솔린 엔진의 배기시스템
CN112236214A (zh) * 2018-06-12 2021-01-15 巴斯夫公司 用于燃油切断NOx控制的TWC***
US11904299B2 (en) 2018-06-12 2024-02-20 Basf Corporation TWC system for fuel cut NOx control
WO2023001617A1 (fr) * 2021-07-21 2023-01-26 Umicore Ag & Co. Kg Système d'épuration des gaz d'échappement pour épurer les gaz d'échappement de moteurs à combustion interne

Similar Documents

Publication Publication Date Title
US5727385A (en) Lean-burn nox catalyst/nox trap system
JP5590640B2 (ja) 排気ガス浄化システム
EP3052775B1 (fr) Systeme de traitement des gaz d'echappement
EP0764459B1 (fr) Séparateurs pour oxyde d'azote
EP0845289B1 (fr) Piége à oxydes d'azote pour un moteur à combustion interne
JPH0579319A (ja) エンジン排気浄化システム
JP2004515338A (ja) 排ガスを浄化するための触媒
EP0764460A2 (fr) Séparateurs pour oxyde d'azote
US20030039597A1 (en) Close coupled catalyst with a SOx trap and methods of making and using the same
JPH10118458A (ja) 窒素酸化物の浄化触媒及び浄化方法
US7265073B2 (en) Exhaust gas purifying catalyst and process for purifying exhaust gas
WO2017082563A1 (fr) Catalyseur d'épuration des gaz d'échappement pour moteur à essence stœchiométrique
US5939037A (en) Sulfur tolerant NOx traps highly loaded with sodium or potassium
JPH09253496A (ja) 排ガス浄化用触媒及び排ガス浄化方法
WO2010140780A2 (fr) Catalyseur trois voies ayant une structure de revêtement triple couche
JP2004016850A (ja) 排気ガス浄化用触媒、製造方法及び排気ガス浄化システム
JP2005205302A (ja) 内燃機関用排ガス浄化触媒および排ガス浄化装置
JP2003135970A (ja) 排気ガス浄化用触媒
JP2002089251A (ja) 内燃機関の排気浄化装置
EP1080783A2 (fr) Catalyseur multi-couches pour l'épuration des gaz d'échappement
JP2001314763A (ja) ＮＯｘ吸蔵還元型触媒用支持材とそれを用いたＮＯｘ吸蔵還元型触媒
JP2000042369A (ja) 内燃機関の排ガス浄化装置，排ガス浄化方法及び排ガス浄化触媒
JPH078755A (ja) 排気ガス浄化装置
EP0927571A2 (fr) Procédé pour le traitement des gaz d'échappement d'un moteur à combustion interne utilisant des absorbants d'oxyde d'azote contenant du platine et de l'alumine
JPH11303625A (ja) 内燃機関の排気浄化装置およびそれを用いた排気浄化法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16864489

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16864489

Country of ref document: EP

Kind code of ref document: A1