WO2014178633A1 - Gasoline particulate filter for gasoline direct injection engine - Google Patents

Gasoline particulate filter for gasoline direct injection engine Download PDF

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Publication number
WO2014178633A1
WO2014178633A1 PCT/KR2014/003823 KR2014003823W WO2014178633A1 WO 2014178633 A1 WO2014178633 A1 WO 2014178633A1 KR 2014003823 W KR2014003823 W KR 2014003823W WO 2014178633 A1 WO2014178633 A1 WO 2014178633A1
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Prior art keywords
catalyst
cell wall
cell
direct injection
gasoline
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PCT/KR2014/003823
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French (fr)
Korean (ko)
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김홍래
송진우
한현식
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희성촉매 주식회사
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Publication of WO2014178633A1 publication Critical patent/WO2014178633A1/en

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    • B01J35/19—
    • 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
    • B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
    • 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
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56—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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1023—Palladium
    • 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
    • B01D2255/1025—Rhodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/903—Multi-zoned catalysts
    • B01D2255/9032—Two zones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/908—O2-storage component incorporated in the catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • B01D2258/014—Stoichiometric gasoline engines
    • 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
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56—Platinum group metals
    • B01J23/63—Platinum group metals with rare earths or actinides
    • B01J35/56—
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/60—Discontinuous, uneven properties of filter material, e.g. different material thickness along the longitudinal direction; Higher filter capacity upstream than downstream in same housing
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
    • F01N2510/0682—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa

Definitions

  • the gasoline direct injection (GDI) engine directly injects gasoline into a cylinder filled with air by directly injecting fuel into the combustion chamber of the engine to inject the fuel through the air intake path behind the conventional intake valve. It is one of the most efficient engines in terms of fuel efficiency and power, but it is more efficient than the injection, but it is more efficient in terms of fuel efficiency and power. Discharge. Particulate matter for GDI-engine vehicles conforming to the Euro-6 regulations will be regulated in two stages, with a primary regulation of 6 ⁇ 10 12 particles / km, equivalent to 10 times that of diesel vehicles, and equivalent to future diesel vehicles 6 The standard will be strengthened to x 10 11 particles / km.
  • diesel particulate filter is a filter technology that collects particulate matter discharged from a diesel engine in a filter, burns it, regenerates it, and collects particulate matter and continues to use it.
  • CSF Catalyzed
  • Such an oxidation catalyst coating filter can effectively remove particulate matter as well as HC, CO and NOx in exhaust gas.
  • the filter forming material may be a metal, an alloy or a ceramic, and a cordierite-based honeycomb filter is known as a representative example of a filter made of ceramic.
  • FIG. 2 is a SEM photograph of the catalyst layer coated on the cell wall
  • FIG. 3 is a SEM photograph of the catalyst layer formed inside the cell wall.
  • FIG. 4 is a partially enlarged cross-sectional view of a cordierite-based catalytic GPF filter according to the present invention.
  • a plurality of through cells 12 ′ and 12 ′′ are divided into porous cell walls 13 and formed in a stagged manner on the inlet side 9a and the outlet side 9b.
  • the first catalyst coating layer 30 is formed on the first half of the cell wall surface of the inlet opening cell 12 ', and the outflow side
  • a second catalyst layer (30 ') is formed in the second half inside the cell wall of the opening cell (12 "), thereby providing a catalytic filter for gasoline direct injection engine soot filtration.
  • the present invention may be implemented with the following features, but is not limited thereto.
  • the first catalyst coating amount coated on the first half of the cell wall surface of the present invention may be present in a larger amount than the second catalyst deposition amount deposited on the second half inside the cell wall.
  • the first catalyst coating layer 30 component and the second catalyst layer 30 ' may be the same or different.
  • the first catalyst coating layer component and the second catalyst layer are characterized by supporting at least one species selected from the group consisting of noble metals of platinum group such as Pt, Rh, Pd, and the second catalyst layer 30 'is made of ceria, zirconia, etc. It may further include an oxygen storage component (OSC) including.
  • OSC oxygen storage component
  • the present invention is not limited to the embodiment, and the term 'section' in the description of the present invention is perpendicular to the exhaust gas flow direction unless otherwise specified. It is defined as the cross section of.
  • the second half may be understood as the side through which the exhaust gas is discharged to the outside through the filter
  • the first half is defined as the side into which the exhaust gas discharged from the engine is introduced.
  • the 'first half' and 'second half' are not necessarily terms for dividing the filter in the longitudinal direction, and may be understood as some of the first half and some of the second half depending on the exhaust gas and engine conditions.
  • a catalyst 30 made of platinum group elements, other metal elements, oxides thereof, or the like is coated or supported on the surface or the pore surface of the cell walls 13 inside the cells 12 'opened in the inflow end surface 9a.
  • the openings of the respective through cells 12 ', 12 "are sealed by plugging 15 on either end face 9a, 9b side.
  • the entire filter structure cross section shows a checkerboard shape.
  • the density is set to around 200 / inch 2 and the thickness of the cell wall 13 is set to about 0.3 mm.
  • the exhaust gas entering the inside of the cell 12 'opened at the inflow end surface 9a passes through the cell wall and is a particulate matter.
  • a plurality of through cells 12 ', 12 "having a substantially square cross section is formed regularly along the axial direction, and each through cell 12', 12" has a The thin cell walls 13 are partitioned from each other.
  • About half of the cells 12' are among the plurality of cells. Is opened in the inflow end surface 9a, and the remaining cells 12 "are opened in the outflow end surface 9b.
  • the first catalyst coating layer 30 made of a platinum group element or other metal element, its oxide, or the like is coated on the surface of the first cell wall 13 inside the inlet-side opening cell 12 'via the cell wall surface.
  • a second catalyst layer 30 ' having the same or different composition as that of the oxidation catalyst is formed in the inner half of the cell wall (the cell wall itself) of the outlet side opening cell 12 ".
  • a small amount of thin second catalyst layer 30 ' is formed in the latter half compared to the first catalyst layer 30 in the first half, and more specifically, the thickness L is formed on the cell wall surface of the inlet-side opening cell 12' in the first half of the cell longitudinal direction.
  • the exhaust gas is supplied to the catalytic filter 10 accommodated in the casing mounted on the GDI engine vehicle at the inflow side 9a end face, and enters the cell 12 'opened at the end face.
  • the flowable exhaust gas passes through the cell wall 13 of the first half 50, the exhaust gas comes into contact with the exposed first catalyst component 30 to undergo HC, CO NOx oxidation and reduction.
  • Purified gaseous components and entrained particulate matter components collide with the longitudinal end point plugging 15 to reach the cell wall second half 60.
  • a relatively thin coating layer 30 ′ is formed in the second half of the cell wall, so that the gas component and the particulate matter component may easily pass through the second half cell wall pores. Therefore, a large amount of particulate matter accumulation is observed in the latter half compared to the first half.
  • components such as HC, CO, and / or NOx contained in the gas are further oxidized, reduced, and purified by the second catalyst layer 30 ', and the trapped particulate matter has a predetermined internal filter temperature. When the temperature is reached, it is complexed and combusted by the action of a noble metal catalyst such as Pt.
  • the second catalyst layer 30 ′ since the second catalyst layer 30 ′ includes a large amount of oxygen storage material, the particulate matter may be easily combusted in a GDI engine in which exhaust gas lacks an oxidizing material.
  • the configuration according to the present invention (hereinafter referred to as a new model) and the comparative configuration (hereinafter, referred to as the former configuration in which only the first catalyst coating layer 30 is formed on the entire surface of the inner cell wall of the inlet side opening cell 12 ' Model), particulate matter, HC, CO and NOx reduction rates were measured.
  • Catalytic filters apply conventional commercial catalyst components.
  • Euro-5 test conditions apply.
  • the new model improved HC, CO and NOx reductions by about 10% and new particulate matters by about 15%.

Abstract

The present invention relates to a gasoline particulate filter for a gasoline direct injection engine and more specifically, to a gasoline particulate filter (GPF) for a gasoline direct injection (GDI) engine, wherein the position and amount of coating of a catalyst to be coated along the lengthwise direction of a cell in the gasoline particulate filter is controlled to improve contact properties with exhaust gas and catalyst ingredients, thereby improving conversion efficiency and reducing engine pressure loss due to the exhaust gas. The gasoline particulate filter for the gasoline direct injection engine comprises: a plurality of through-cells (12', 12") defined and partitioned by porous cell walls (13), and two ends (15) on an inlet side (9a) and an outlet side (9b) are plugged in a staggered way, wherein a first catalyst coating layer (30) is formed on the front half portion of a cell wall surface of an inlet-side open cell (12'), and a second catalyst layer (30') is formed on the back half portion of an inner cell wall of an outlet-side open cell (12").

Description

가솔린직접분사엔진 매연여과용 촉매식 필터Catalytic filter for gasoline direct injection engine soot filtration
본 발명은 가솔린직접분사엔진 매연여과용 촉매식 필터에 관한 것으로, 더욱 상세하게는 가솔린직접분사(GDI) 엔진 매연여과용 촉매식 필터 (GPF)에 있어서, 셀 길이방향에 코팅되는 촉매의 코팅위치 및 코팅량을 제어하여, 배기가스 및 촉매성분들과의 접촉성을 개선함으로써 전환효율을 높이고 배기가스로 인한 엔진 압력손실을 낮출 수 있는 촉매식 필터에 관한 것이다.The present invention relates to a catalytic filter for gasoline direct injection engine soot filtration, and more particularly, to a catalytic filter (GPF) for gasoline direct injection (GDI) engine soot filtration. And it relates to a catalytic filter that can control the coating amount, to improve the contact with the exhaust gas and the catalyst components to increase the conversion efficiency and lower the engine pressure loss due to the exhaust gas.
가솔린직접분사식 (gasoline direct injection, GDI) 엔진은 엔진의 연소실 내부에 연료를 직접 분사하는 방식으로 미리 공기를 충전해 놓은 실린더 안에 가솔린을 직접 분사함으로써 종래 흡기밸브 뒤쪽에서 공기의 흡입되는 경로로 연료를 분사하는 것보다 더욱 효율적인 폭발 및 연소가 일어날 수 있도록 하는 방식의 엔진으로 연비 및 출력에 있어서 가장 효율적인 엔진의 하나이지만, 종래 포트 연료주입방식보다 더 많은 입자상 물질 (PM) 및 입자 개수 (PN)를 배출한다. 유로-6 규정에 적합한 GDI-엔진 차량에 대한 입자상 물질은 2 단계로 규제될 것이고, 1차로 디젤차량의 10배에 해당하는 6 × 1012 입자들/km로 규제되고 향후 디젤차량과 동등한 기준 6 × 1011 입자들/km로 기준이 강화될 것이다. The gasoline direct injection (GDI) engine directly injects gasoline into a cylinder filled with air by directly injecting fuel into the combustion chamber of the engine to inject the fuel through the air intake path behind the conventional intake valve. It is one of the most efficient engines in terms of fuel efficiency and power, but it is more efficient than the injection, but it is more efficient in terms of fuel efficiency and power. Discharge. Particulate matter for GDI-engine vehicles conforming to the Euro-6 regulations will be regulated in two stages, with a primary regulation of 6 × 10 12 particles / km, equivalent to 10 times that of diesel vehicles, and equivalent to future diesel vehicles 6 The standard will be strengthened to x 10 11 particles / km.
한편, DPF (Diesel particulate filter)는 디젤엔진에서 배출되는 입자상 물질을 필터에 포집한 후, 이를 태워서 재생하고 다시 입자상 물질을 포집하여 계속 사용하는 필터기술로서, DPF에 산화촉매를 코팅하는 CSF (Catalyzed soot filter) 방식이 채용될 수 있다. 이러한 산화촉매코팅 필터는 배기가스 중의 HC, CO 및 NOx와 더불어 입자상 물질을 효과적으로 제거할 수 있다. 필터 형성재료로서는 금속, 합금 또는 세라믹이 될 수 있으며, 세라믹으로 이루어진 필터의 대표적인 예로서 코디어라이트계의 하니콤 필터가 알려져 있다. 최근에는 내열성, 기계적 강도 및 포집 효율이 높고, 화학적으로 안정되어 있고, 압력손실이 적은 등의 장점을 가진 다공질 탄화규소 소결체가 필터 형성재료로서 이용되는 경우가 많다. 여기서 '압력손실'이란, 필터 유입측의 압력치로부터 유출측의 압력치를 뺀 것을 말하며, 배기가스가 필터를 통과할 때 저항을 받는 것이, 압력손실을 가져오는 최대의 요인이다. 종래 코디어라이트계 하니콤 필터는 자신의 축선 방향을 따라서 뻗어있는 다수의 셀을 가지고 있다. 배기가스가 필터를 통과할 때, 그 셀벽에 의해 미립자가 트랩(침적)되며, 그 결과 배기가스의 가스성분으로부터 미립자가 제거된다. 그러나, 허니콤 필터는 사용시간의 증가에 따라 입자상 물질 증착으로 인한 압력손실이 증가한다. 따라서 DPF의 경우, 증착된 입자상 물질을 정기적으로 제거하여야 할 필요가 있고, 압력손실이 증가할 경우, 버너 또는 전열기로 증착 입자상 물질을 연소시킴으로 제거한다.Meanwhile, diesel particulate filter (DPF) is a filter technology that collects particulate matter discharged from a diesel engine in a filter, burns it, regenerates it, and collects particulate matter and continues to use it. CSF (Catalyzed) which coats an oxidation catalyst on DPF soot filter) method may be employed. Such an oxidation catalyst coating filter can effectively remove particulate matter as well as HC, CO and NOx in exhaust gas. The filter forming material may be a metal, an alloy or a ceramic, and a cordierite-based honeycomb filter is known as a representative example of a filter made of ceramic. In recent years, porous silicon carbide sintered bodies having advantages of high heat resistance, high mechanical strength, high collection efficiency, chemical stability, and low pressure loss are often used as filter forming materials. Here, the "pressure loss" means the pressure value at the outflow side minus the pressure value at the inflow side of the filter, and being subjected to resistance when the exhaust gas passes through the filter is the biggest factor that causes the pressure loss. Conventional cordierite-based honeycomb filters have a plurality of cells extending along their axial direction. When the exhaust gas passes through the filter, the particulates are trapped by the cell walls, and as a result, the particulates are removed from the gas component of the exhaust gas. However, in the honeycomb filter, the pressure loss due to the deposition of particulate matter increases with the use time. Therefore, in the case of DPF, it is necessary to periodically remove the deposited particulate matter, and when the pressure loss increases, it is removed by burning the deposited particulate matter with a burner or a heater.
그러나, 이러한 종래 DPF 필터구성을 GDI 엔진 배기가스에 적용할 수 없다. GDI 엔진에서 발생되는 입자상 물질은 디젤엔진의 입자상 물질과 비교하여 더욱 미세하고 (10 내지 100nm), 따라서 셀벽 막힘에 의한 압력손실 문제에 더욱 민감하고, 또한 GDI 엔진은 디젤엔진 배기가스와 비교하여 침적된 입자상 물질을 연소시키기 위한 산소가 부족하므로 이를 보완하기 위한 촉매 구성이 필요하다.However, such a conventional DPF filter configuration cannot be applied to GDI engine exhaust gas. Particulate matter generated in GDI engines is finer (10 to 100 nm) compared to particulate matter in diesel engines, and therefore more sensitive to pressure drop problems caused by cell wall blockages, and GDI engines are also deposited compared to diesel engine exhaust gases. Since there is a lack of oxygen for burning the particulate matter, a catalyst configuration is necessary to compensate for this.
본 발명자는 필터 내부에 셀 길이방향에 코팅되는 촉매의 형성위치 및 위치별 함량을 제어함으로써, GDI 엔진 배기가스 및 촉매와의 접촉성을 개선하고 배기가스로 인한 엔진 압력손실을 감소시킬 수 있는 촉매식 필터를 제안하는 것이다.The present inventors control the formation position and content of the catalyst coated in the cell longitudinal direction inside the filter, thereby improving the contact with the GDI engine exhaust gas and the catalyst and reduce the engine pressure loss due to the exhaust gas I would suggest an expression filter.
본 발명에 의한 촉매식 필터는 종래 촉매식 필터와 비교하여 HC, CO, NOx 저감율을 유지하면서도 입자상 물질을 획기적으로 낮출 수 있다.Catalytic filter according to the present invention can significantly lower the particulate matter while maintaining the HC, CO, NOx reduction rate compared to the conventional catalytic filter.
도 1은 통상의 코디어라이트계 촉매식 필터 개략사시도 및 부분 확대단면도이며,1 is a schematic perspective view and a partially enlarged cross-sectional view of a conventional cordierite-based catalytic filter,
도 2는 셀벽에 코팅된 촉매층 SEM 사진이며, 도 3은 셀벽 내부에 형성된 촉매층 SEM 사진이다.2 is a SEM photograph of the catalyst layer coated on the cell wall, and FIG. 3 is a SEM photograph of the catalyst layer formed inside the cell wall.
도 4는 본 발명에 의한 코디어라이트계 촉매식 GPF 필터의 부분 확대단면도이다.4 is a partially enlarged cross-sectional view of a cordierite-based catalytic GPF filter according to the present invention.
상기 목적을 달성하기 위하여 본 발명은 복수개의 관통셀(12', 12")이 다공질 셀벽(13)으로 구분되어 형성되며, 유입측(9a) 및 유출측(9b)에 상호 지그재그(in a stagged way) 방식으로 양단이 플러깅(15)된 가솔린직접분사엔진 매연여과용 촉매식 필터에 있어서, 유입측 개구 셀(12')의 셀벽 표면 전반부에 제1 촉매코팅층(30)이 형성되며, 유출측 개구 셀(12")의 셀벽 내부 후반부에 제2 촉매층(30')이 형성되는 것을 특징으로 하는, 가솔린직접분사엔진 매연여과용 촉매식 필터를 제공하는 것이다.In order to achieve the above object, in the present invention, a plurality of through cells 12 ′ and 12 ″ are divided into porous cell walls 13 and formed in a stagged manner on the inlet side 9a and the outlet side 9b. In the catalytic filter for gasoline direct injection engine soot filtration having both ends plugged (15) in a way), the first catalyst coating layer 30 is formed on the first half of the cell wall surface of the inlet opening cell 12 ', and the outflow side A second catalyst layer (30 ') is formed in the second half inside the cell wall of the opening cell (12 "), thereby providing a catalytic filter for gasoline direct injection engine soot filtration.
본 발명은 다음과 특징부들로 구현될 수 있으나, 이에 한정되는 것은 아니다. 본 발명의 셀벽 표면 전반부에 코팅되는 제 1 촉매코팅량은 셀벽 내부 후반부에 침적되는 제2 촉매침적량보다 다량 존재할 수 있다. 제1 촉매코팅층 (30) 성분 및 제2 촉매층 (30')과는 동일하거나 상이할 수 있다. 제1 촉매코팅층 성분 및 제2 촉매층은 Pt, Rh, Pd와 같은 백금족의 귀금속으로 구성된 그룹으로부터 선택된 1종 이상의 종을 담지하고 있는 것을 특징으로 하며, 제2 촉매층 (30')은 세리아, 지르코니아 등을 포함한 산소저장성분 (OSC)를 더욱 포함할 수 있다.The present invention may be implemented with the following features, but is not limited thereto. The first catalyst coating amount coated on the first half of the cell wall surface of the present invention may be present in a larger amount than the second catalyst deposition amount deposited on the second half inside the cell wall. The first catalyst coating layer 30 component and the second catalyst layer 30 'may be the same or different. The first catalyst coating layer component and the second catalyst layer are characterized by supporting at least one species selected from the group consisting of noble metals of platinum group such as Pt, Rh, Pd, and the second catalyst layer 30 'is made of ceria, zirconia, etc. It may further include an oxygen storage component (OSC) including.
본 발명에 의하면 셀 길이방향 전반부(배기가스 유입측)에 노출된 다량의 촉매성분으로 인하여 배기가스 성분, 즉 HC, CO, NOx의 산화 환원반응이 촉진되고, 대부분의 가스성분 및 입자상 물질이 통과되는 후반부에는 전반부 대비 상대적으로 소량의 촉매성분이 셀벽 내부에 형성되어 배기가스로 인한 압력손실을 최소화할 수 있다. 또한, 상대적으로 소량의 촉매성분이 셀벽 내부 후반부에 담지되므로, 입자상 물질 연소에 의한 재생작업에 있어서 후반부 셀벽 내부에서의 급격한 온도상승을 방지하고, 셀 길이방향 온도 불균일을 해소하여 열응력에 의한 크랙발생을 방지할 수 있다.According to the present invention, the redox reaction of the exhaust gas components, that is, HC, CO, and NOx is promoted due to the large amount of catalyst components exposed to the first half of the cell longitudinal direction (exhaust gas inflow side), and most of the gas components and particulate matter pass through. In the latter part, a relatively small amount of catalyst component is formed inside the cell wall compared to the first part, thereby minimizing pressure loss due to exhaust gas. In addition, since a relatively small amount of the catalyst component is supported in the latter half of the cell wall, it is possible to prevent rapid temperature rise in the latter half of the cell wall in the regeneration operation by burning particulate matter, to eliminate the temperature longitudinal unevenness in the cell longitudinal direction, and to crack due to thermal stress. It can prevent occurrence.
이하, 도면을 참조하여 본 발명에 의한 촉매식 필터를 설명하지만, 본 발명은 실시 형태에 한정되는 것은 아니며, 본 발명의 설명에서 '단면'이란, 달리 특정하지 않는 한 배기가스 유동방향에 대한 수직의 단면으로 정의된다. 한편, '후반부'라 함은 배기가스가 필터를 통과하여 외부로 배출되는 측으로 이해될 수 있으며, '전반부'라 함은 엔진으로부터 배출된 배기가스가 인입되는 측으로 정의된다. 또한, '전반부' 및 '후반부'는 반드시 필터를 길이방향으로 양분하는 용어는 아니며, 배출가스 및 엔진 조건에 따라 전반부 중 일부 및 후반부 중 일부분으로 이해될 수 있다. Hereinafter, the catalytic filter according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiment, and the term 'section' in the description of the present invention is perpendicular to the exhaust gas flow direction unless otherwise specified. It is defined as the cross section of. On the other hand, the second half may be understood as the side through which the exhaust gas is discharged to the outside through the filter, the first half is defined as the side into which the exhaust gas discharged from the engine is introduced. Further, the 'first half' and 'second half' are not necessarily terms for dividing the filter in the longitudinal direction, and may be understood as some of the first half and some of the second half depending on the exhaust gas and engine conditions.
이하 통상적인 촉매식 하니콤 필터의 구조를 도 1을 참조하여 설명한다. 도 1은 통상의 원기둥 형상의 촉매식 코디어라이트계 필터의 사시도 및 부분 확대단면도를 도시한 것이다. 상기 하니콤 필터(10) 구조체는, 단면이 대략 정방형상을 이루는 복수의 관통셀(12', 12")이 축선방향을 따라서 규칙적으로 형성되어 있으며, 각 관통셀(12', 12")은 얇은 셀벽(13)에 의해 서로 칸막이 되어 있다. 다수개의 셀중에, 약 반수는 유입단면(9a)에 있어서 개구되고, 나머지 셀은 유출단면(9b)에 있어서 개구된다. 유입단면(9a)에 개구된 셀(12')들 내부의 셀벽(13)의 표면 또는 세공 표면에는 백금족 원소나 그외 금속원소 및 그 산화물 등으로 이루어진 촉매(30)가 코팅 또는 담지되어 있다. 각 관통셀(12', 12")의 개구부는, 어느 한쪽의 단면(9a, 9b)측에 있어서, 플러깅(15)에 의해 밀봉되어 있다. 따라서 필터 구조체 단면 전체는 바둑판모양을 나타낸다. 셀의 밀도는 200개/인치2 전후로 설정되고, 셀벽(13)의 두께는 0.3mm 전후로 설정된다. 유입단면(9a)에서 개구된 셀(12') 내부로 진입된 배기가스는 셀벽을 통과하면서 입자상 물질은 걸러지고(트랩, 침적) 나머지 가스 성분만 셀벽 기공(세공)을 통해 유출단면(9b)에서 개구된 셀(12")을 통하여 외부로 배출된다. 이때, 가스 성분은 셀벽(13)에 코팅되거나 (도 2 참고) 또는 셀벽 내부에 담지된 (도 3 참고)된 촉매에 의해 산화 환원반응이 촉진되어 무해한 성분으로 전환되어 유출단면(9b) 방향으로 외부 방출된다.Hereinafter, a structure of a conventional catalytic honeycomb filter will be described with reference to FIG. 1. 1 is a perspective view and a partially enlarged cross-sectional view of a conventional cylindrical catalytic cordierite filter. In the honeycomb filter 10 structure, a plurality of through cells 12 ', 12 "having a substantially square cross section is formed regularly along the axial direction, and each through cell 12', 12" is The thin cell walls 13 are partitioned from each other. Of the plurality of cells, about half are opened in the inlet end face 9a, and the remaining cells are opened in the outlet end face 9b. A catalyst 30 made of platinum group elements, other metal elements, oxides thereof, or the like is coated or supported on the surface or the pore surface of the cell walls 13 inside the cells 12 'opened in the inflow end surface 9a. The openings of the respective through cells 12 ', 12 "are sealed by plugging 15 on either end face 9a, 9b side. Thus, the entire filter structure cross section shows a checkerboard shape. The density is set to around 200 / inch 2 and the thickness of the cell wall 13 is set to about 0.3 mm. The exhaust gas entering the inside of the cell 12 'opened at the inflow end surface 9a passes through the cell wall and is a particulate matter. Is filtered out (trap, deposition) and only the remaining gaseous components are discharged to the outside through the cell 12 " opened at the outlet section 9b through the cell wall pores (pore). At this time, the gas component is promoted by a catalyst coated on the cell wall 13 (see FIG. 2) or supported on the inside of the cell wall (see FIG. 3) to be converted into a harmless component to the outflow section 9b. Is emitted outside.
도 4는 본 발명에 의한 GPF 개략사시도 및 부분 확대단면도를 도시한 것이고, 도 1의 요소와 동일한 부분에 대하여는 별도로 언급하지 않는다.Fig. 4 shows a schematic perspective and partial enlarged cross-sectional view of a GPF according to the present invention, and no reference is made to the same parts as the elements of Fig. 1.
본 발명에 의한 촉매식 필터는, 코디어라이트 등의 내열성 세라믹스로 제조될 수 있다. 예를들면, 코디어라이트 분말을 주성분으로 하는 점토상의 슬러리를 조제하고, 그것을 압출 성형하여 소성할 수 있다. 코디어라이트 분말 대신에, 알루미나, 마그네시아 및 실리카의 각 분말을 코디어라이트(cordierite) 조성이 되도록 배합할 수도 있다. 또한, 내열성 및 열전도성이 우수한 탄화규소 또는 질화규소, 사이알론(SIALON), 뮬라이트(mullite) 등의 소결체를 선택할 수도 있다.The catalytic filter according to the present invention can be made of heat resistant ceramics such as cordierite. For example, a clay slurry containing a cordierite powder as a main component can be prepared, and it can be extruded and fired. Instead of cordierite powder, each powder of alumina, magnesia and silica may be blended so as to have a cordierite composition. In addition, a sintered body of silicon carbide or silicon nitride, sialon (SIALON), mullite (excellent heat resistance and heat conductivity) may be selected.
본 발명에 의한 촉매식 필터 구조체는, 단면이 대략 정방형상을 이루는 복수의 관통셀(12', 12")이 축선방향을 따라서 규칙적으로 형성되어 있으며, 각 관통셀(12', 12")은 얇은 셀벽(13)에 의해 서로 칸막이 되어 있다. 각 관통셀(12', 12")의 개구부는, 어느 한쪽의 단면(9a, 9b)측에 있어서, 플러깅(15)에 의해 밀봉되어 있다. 다수개의 셀중에, 약 반수의 셀(12')는 유입단면(9a)에 있어서 개구되고, 나머지 셀(12")은 유출단면(9b)에 있어서 개구된다.In the catalytic filter structure according to the present invention, a plurality of through cells 12 ', 12 "having a substantially square cross section is formed regularly along the axial direction, and each through cell 12', 12" has a The thin cell walls 13 are partitioned from each other. The openings of the respective through cells 12 ', 12 "are sealed by plugging 15 on either end face 9a, 9b side. About half of the cells 12' are among the plurality of cells. Is opened in the inflow end surface 9a, and the remaining cells 12 "are opened in the outflow end surface 9b.
본 발명에 의한 GPF 구조체는, 유입측 개구 셀(12') 내부 셀벽(13) 전반부 표면에는 백금족 원소나 그외의 금속원소 및 그 산화물 등으로 이루어진 제1 촉매코팅층(30)이 셀벽 표면에 거쳐 코팅되어 있으며, 유출측 개구 셀(12")의 셀벽 내부 후반부 (셀벽 자체)에는 상기 산화촉매와 동일한 또는 상이한 조성의 제2 촉매층(30')이 형성된다. 또한 상기 구성의 구조체는, 셀 길이방향 전반부의 제1 촉매층 (30)에 비하여 후반부에 소량의 얇은 제2 촉매층 (30')이 형성되는 것이며, 더욱 상세하게는 셀 길이방향 전반부에는 유입측 개구 셀(12')의 셀벽 표면에 두께 L의 코팅층(30)이 형성되며, 셀 길이방향 후반부에는 유출측 개구 셀(12") 셀벽 내부에 두께 l의 코팅층(30')이 형성되되, 두께 L은 두께 l 보다 크다. 상기 구성의 구조체는 필터 셀로 유입되는 배기가스 유동방향을 변경시킬 수 있다. 즉 유입측 개구 셀(12') 내부로 진입된 배기가스는 결과적으로 두껍게 형성된 전반부 코팅층보다는 상대적으로 얇게 형성된 후반부 산화층의 셀벽 기공(기공율 30-70%)을 통하여 인접 셀들로 유동됨으로서 엔진에 대한 압력손실이 감소된다. 배기가스 중 가스성분과 동반되는 입자상 물질은 따라서 전반부에 비하여 상대적으로 얇게 코팅층이 형성된 길이방향 후반부 셀벽에 다량 침적(트랩)되며, 시간 경과에 따라 후반부에는 누적 입자상 물질이 다량 존재한다. 이러한 관점에서. 제2 촉매층 (30')에는 제1 촉매층 (30)과 대비하여 OSC 성분이 다량 포함될 수 있다. 이러한 OSC 성분은 누적 입자상 물질 연소를 촉발시키며, 상대적으로 소량의 촉매성분들로 인하여 후반부 셀벽 내부에서의 급격한 온도상승을 방지하고, 셀 길이방향 온도 불균일을 해소하여 열응력에 의한 크랙발생을 방지할 수 있다.In the GPF structure according to the present invention, the first catalyst coating layer 30 made of a platinum group element or other metal element, its oxide, or the like is coated on the surface of the first cell wall 13 inside the inlet-side opening cell 12 'via the cell wall surface. And a second catalyst layer 30 'having the same or different composition as that of the oxidation catalyst is formed in the inner half of the cell wall (the cell wall itself) of the outlet side opening cell 12 ". A small amount of thin second catalyst layer 30 'is formed in the latter half compared to the first catalyst layer 30 in the first half, and more specifically, the thickness L is formed on the cell wall surface of the inlet-side opening cell 12' in the first half of the cell longitudinal direction. A coating layer 30 is formed, and a coating layer 30 'having a thickness l is formed in the cell wall of the outlet side opening cell 12 "in the latter half of the cell longitudinal direction, wherein the thickness L is larger than the thickness l. The structure of the above configuration can change the exhaust gas flow direction flowing into the filter cell. That is, the exhaust gas entered into the inlet opening cell 12 'consequently flows to adjacent cells through the cell wall pores (30-70% porosity) of the latter oxide layer, which is relatively thinner than the thicker first half coating layer. Loss is reduced. The particulate matter accompanying the gaseous components in the exhaust gas is thus deposited in a large amount on the cell wall in the longitudinal longitudinal second half where the coating layer is formed relatively thinly compared to the first half, and there is a large amount of accumulated particulate matter in the latter half over time. In this respect. The second catalyst layer 30 ′ may include a large amount of OSC components as compared to the first catalyst layer 30. This OSC component triggers the accumulation of cumulative particulate matter, prevents rapid temperature rise inside the latter cell wall due to relatively small amount of catalyst components, and eliminates cracking due to thermal stress by eliminating cell longitudinal temperature unevenness. Can be.
본 발명에 의한 구조체에 있어서 유입측 개구 셀(12') 내부 셀벽 표면에 코팅되거나 및/또는 유출측 개구 셀(12") 셀벽 내부 후반부에 담지되는 제1 및 제2 촉매조성물은 공지된 것이다. 예를들면, 촉매층은 다음과 같은 방식으로 형성될 수 있다. 산화물 분말 또는 복합산화물 분말을 알루미나 졸과 같은 바인더성분 및 물과 함께 슬러리로 만든다. 그 슬러리에 유입측 방향으로 디핑(dipping)하여 상기 촉매식 필터 구조체 유입측 개구 셀(12') 내부 셀벽에 촉매를 코팅시킨 후에 건조, 소성한다. 연속하여 유출측 방향으로 구조체를 디핑하되, 이번에는 상기 촉매식 필터 구조체 유출측 개구 셀(12") 내부 후반부 셀벽에만 촉매를 담지시킨 후 건조, 소성한다. 슬러리를 셀 벽에 담지시키는 경우, 기타 통상의 코팅법을 사용할 수 있다. 촉매층에 담지되는 촉매성분으로는, 촉매반응에 의해 NOx를 환원할 수 있고, 또한 HC (탄화수소), CO, 입자상 물질의 산화를 촉진할 수 있는 촉매성분을 사용할 수 있다. 바람직하게는, 제1 및 제2 촉매층에는 Pt, Rh, Pd와 같은 백금족의 귀금속으로 구성된 그룹으로부터 선택된 1종이상의 종을 담지하는 것이 바람직하다. 그러나, 상기된 바와 같이, 제2 촉매층 (30')에는 제1 촉매층 (30)과 대비하여 OSC (산소저장물질, 예를들면 세리아) 성분이 다량 포함될 수 있다. 이러한 OSC 성분은 GDI 엔진의 배기가스가 필연적으로 산소성분이 부족하므로 이를 보완하기 위한 구성으로, 침적된 입자상 물질 연소를 촉발시킬 수 있다.In the structure according to the present invention, the first and second catalyst compositions coated on the inner cell wall surface of the inlet opening cell 12 'and / or supported on the inner half of the inner wall of the outlet opening cell 12 "are known. For example, the catalyst layer may be formed in the following manner: An oxide powder or a composite oxide powder is made into a slurry together with a binder component such as alumina sol and water, dipping into the slurry in the inflow direction. The catalyst is coated on the inner cell wall of the inlet-side opening cell 12 'and then dried and calcined. The structure is continuously dipped in the outlet-side direction, but this time the catalyst-filter structure outlet-side opening cell 12 ". ) The catalyst is supported only on the inner half cell wall, then dried and calcined. When the slurry is supported on the cell walls, other conventional coating methods can be used. As the catalyst component supported on the catalyst layer, a catalyst component capable of reducing NOx by catalytic reaction and promoting the oxidation of HC (hydrocarbon), CO, and particulate matter can be used. Preferably, it is preferable that the first and second catalyst layers carry at least one species selected from the group consisting of noble metals of platinum group such as Pt, Rh, Pd. However, as described above, the second catalyst layer 30 ′ may include a large amount of OSC (oxygen storage material, eg, ceria) component as compared to the first catalyst layer 30. The OSC component is a component for compensating for the exhaust gas of the GDI engine because it inevitably lacks the oxygen component, it can trigger the combustion of the deposited particulate matter.
이하, 본 발명에 의한 촉매식 필터의 촉매작용 및 입자상 물질 트랩작용에 관하여 간단하게 설명한다. GDI 엔진 차량에 장착되는 케이싱내에 수용되는 촉매식 필터(10)에, 유입측(9a) 단면으로 배기가스가 공급되며, 단면에 개구된 셀(12')에 진입된다. 유동성 배기가스는 전반부(50) 셀벽(13)을 통과할 때, 노출된 제1 촉매성분 (30)과 접촉하여 HC, CO NOx 산화 및 환원반응이 진행된다. 정화된 가스성분들 및 동반된 입자상 물질 성분은, 길이방향 마지막 지점인 플러깅(15)과 충돌되어 셀벽 후반부(60)에 도달된다. 셀벽 후반부에는 전반부와는 달리 상대적으로 얇은 코팅층(30')이 형성되어 있으므로, 가스성분 및 입자상 물질 성분은 후반부 셀벽 기공을 용이하게 통과할 수 있다. 따라서, 전반부 대비 후반부에는 다수의 입자상 물질 누적량이 관찰된다. 한편, 후반부 셀벽을 통과하면서, 가스에 포함된 HC 및 CO 및/또는 NOx 같은 성분은 제2 촉매층(30')에 의해 더욱 산화, 환원되고 정화되며, 트랩된 입자상 물질은, 필터 내부온도가 소정의 온도에 도달되면, Pt 등의 귀금속 촉매의 작용에 의해 착화되어 연소된다. 이때 제 2 촉매층 (30')에는 산소저장물질이 다량 포함되므로 배기가스에 산화성 물질이 부족한 GDI 엔진에서 입자상 물질을 용이하게 연소시킬 수 있다.Hereinafter, the catalytic action and the particulate matter trapping action of the catalytic filter according to the present invention will be briefly described. The exhaust gas is supplied to the catalytic filter 10 accommodated in the casing mounted on the GDI engine vehicle at the inflow side 9a end face, and enters the cell 12 'opened at the end face. When the flowable exhaust gas passes through the cell wall 13 of the first half 50, the exhaust gas comes into contact with the exposed first catalyst component 30 to undergo HC, CO NOx oxidation and reduction. Purified gaseous components and entrained particulate matter components collide with the longitudinal end point plugging 15 to reach the cell wall second half 60. Unlike the first half, a relatively thin coating layer 30 ′ is formed in the second half of the cell wall, so that the gas component and the particulate matter component may easily pass through the second half cell wall pores. Therefore, a large amount of particulate matter accumulation is observed in the latter half compared to the first half. Meanwhile, while passing through the second half cell wall, components such as HC, CO, and / or NOx contained in the gas are further oxidized, reduced, and purified by the second catalyst layer 30 ', and the trapped particulate matter has a predetermined internal filter temperature. When the temperature is reached, it is complexed and combusted by the action of a noble metal catalyst such as Pt. In this case, since the second catalyst layer 30 ′ includes a large amount of oxygen storage material, the particulate matter may be easily combusted in a GDI engine in which exhaust gas lacks an oxidizing material.
본 구성에 의한 효과를 측정하기 위하여, 본 발명에 의한 구성(이하,신모델), 및 유입측 개구 셀(12') 내부 셀벽 전 표면에 제1 촉매코팅층(30)만이 형성된 비교 구성(이하, 구 모델)에 대하여, 입자상 물질, HC, CO 및 NOx 저감율을 측정하였다. 촉매식 필터는 통상의 상업용 촉매성분들 적용. Euro-5 시험조건 적용. 적용차량은 2.4L GDI, MVEG, 노화조건: Exothermic 에이징, 100시간. 구모델과 대비하여 신모델은 신품 및 노화시킨 후에도 HC, CO 및 NOx 저감율은 약 10% 개선되었고, 입자상 물질은 약 15% 감소되었다.In order to measure the effect by the present configuration, the configuration according to the present invention (hereinafter referred to as a new model) and the comparative configuration (hereinafter, referred to as the former configuration in which only the first catalyst coating layer 30 is formed on the entire surface of the inner cell wall of the inlet side opening cell 12 ' Model), particulate matter, HC, CO and NOx reduction rates were measured. Catalytic filters apply conventional commercial catalyst components. Euro-5 test conditions apply. Applicable vehicles: 2.4L GDI, MVEG, Aging condition: Exothermic aging, 100 hours. Compared to the old model, the new model improved HC, CO and NOx reductions by about 10% and new particulate matters by about 15%.
본 발명을 구체적인 실시양태를 들어 상세히 설명하였으나, 이러한 실시양태는 단지 예시를 위한 것이며, 본 발명의 범위는 첨부된 청구의 범위에 기초된다.While the invention has been described in detail with reference to specific embodiments, these embodiments are for illustration only, the scope of the invention being based on the appended claims.

Claims (5)

  1. 복수개의 관통셀(12', 12")이 다공질 셀벽(13)으로 구분되어 형성되며, 유입측(9a) 및 유출측(9b)에 상호 지그재그(in a stagged way) 방식으로 양단이 플러깅(15)된 가솔린직접분사엔진 매연여과용 촉매식 필터에 있어서, 유입측 개구 셀(12')의 셀벽 표면 전반부에 제1 촉매코팅층(30)이 형성되며, 유출측 개구 셀(12")의 셀벽 내부 후반부에 제2 촉매층(30')이 형성되는 것을 특징으로 하는, 가솔린직접분사엔진 매연여과용 촉매식 필터.A plurality of through cells 12 'and 12 "are formed by being separated by the porous cell wall 13, and both ends are plugged in an a stagged way on the inlet side 9a and the outlet side 9b. In the catalytic filter for gasoline direct injection engine soot filtration, the first catalyst coating layer 30 is formed in the first half of the cell wall surface of the inlet side opening cell 12 ', and inside the cell wall of the outlet side opening cell 12 ". Catalytic filter for gasoline direct injection engine soot filtration, characterized in that the second catalyst layer (30 ') is formed in the second half.
  2. 제1항에 있어서, 셀벽 표면 전반부에 코팅되는 제 1 촉매코팅층 (30)의 코팅량은 셀벽 내부 후반부에 담지되는 제2 촉매층 (30') 담지량보다 많은 것을 특징으로 하는, 가솔린직접분사엔진 매연여과용 촉매식 필터.2. The gasoline direct injection engine soot filtration as claimed in claim 1, wherein the coating amount of the first catalyst coating layer 30 coated on the first half of the cell wall surface is larger than the amount of the second catalyst layer 30 'supported on the second half inside the cell wall. Catalytic filter for.
  3. 제1항에 있어서, 셀벽 표면 전반부에 코팅되는 제 1 촉매코팅층 (30)의 두께는 셀벽 내부 후반부에 담지되는 제2 촉매층 (30') 두께보다 두꺼운 것을 특징으로 하는, 가솔린직접분사엔진 매연여과용 촉매식 필터.2. The gasoline direct injection engine soot filtration as claimed in claim 1, characterized in that the thickness of the first catalyst coating layer 30 coated in the first half of the cell wall surface is thicker than the thickness of the second catalyst layer 30 'supported in the latter half of the cell wall. Catalytic filter.
  4. 제1항에 있어서, 상기 제1 촉매코팅층(30) 및 제2 촉매층 (30')은 Pt, Rh, Pd와 같은 백금족의 귀금속으로 구성된 군에서 선택된 1종 이상의 종을 담지하고 있는 것을 특징으로 하는, 가솔린직접분사엔진 매연여과용 촉매식 필터.The method of claim 1, wherein the first catalyst coating layer 30 and the second catalyst layer 30 'is characterized in that it carries at least one species selected from the group consisting of noble metals of platinum group such as Pt, Rh, Pd. Catalytic filter for direct injection of gasoline direct injection engines.
  5. 제4항에 있어서, 제2 촉매층 (30')은 산소저장성분 (OSC)를 더욱 포함하는 것을 특징으로 하는, 가솔린직접분사엔진 매연여과용 촉매식 필터.5. The catalytic filter of claim 4, wherein the second catalyst layer (30 ') further comprises an oxygen storage component (OSC).
PCT/KR2014/003823 2013-05-02 2014-04-30 Gasoline particulate filter for gasoline direct injection engine WO2014178633A1 (en)

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