KR20110126402A - Catalyst device of vehicle - Google Patents

Catalyst device of vehicle Download PDF

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KR20110126402A
KR20110126402A KR1020100046061A KR20100046061A KR20110126402A KR 20110126402 A KR20110126402 A KR 20110126402A KR 1020100046061 A KR1020100046061 A KR 1020100046061A KR 20100046061 A KR20100046061 A KR 20100046061A KR 20110126402 A KR20110126402 A KR 20110126402A
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South Korea
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layer
low temperature
carbon monoxide
oxide layer
way catalyst
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KR1020100046061A
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Korean (ko)
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KR101637586B1 (en
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송영일
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현대자동차주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—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
    • 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
    • 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
    • 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

Abstract

PURPOSE: A catalyst device for vehicles is provided to prevent the discharge of hydrocarbon absorbed at a hydrocarbon absorbing layer before the hydrocarbon is purified by rapidly raising the temperature of a ternary catalyst layer. CONSTITUTION: A catalyst device for vehicles includes a carrier wall(10), a hydrocarbon absorbing layer(20), a carbon monoxide low temperature oxide layer(30), and a ternary catalyst layer(40). The hydrocarbon absorbing layer absorbs hydrocarbon by being coated on the carrier wall. The carbon monoxide low temperature oxide layer is coated on the hydrocarbon absorbing layer. The carbon monoxide low temperature oxide layer purifies carbon monoxide at low temperatures. The carbon monoxide oxide layer includes silver alloy, a support composed of titania, and a cocatalyst composed of ceria. The carbon monoxide low temperature oxide layer starts the oxidizing reaction of carbon monoxide at a temperature which is lower than or equal to 100 degrees Celsius. The carbon monoxide low temperature oxide layer warms-up the ternary catalyst layer and induces the activation of the ternary catalyst layer.

Description

차량의 촉매 장치{CATALYST DEVICE OF VEHICLE}Catalytic device of a vehicle {CATALYST DEVICE OF VEHICLE}

본 발명은 차량의 촉매 장치에 관한 것으로서, 보다 상세하게는, 저온에서 활성화되는 차량의 촉매 장치에 관한 것이다.The present invention relates to a catalytic device of a vehicle, and more particularly, to a catalytic device of a vehicle that is activated at a low temperature.

종래 차량에는 가솔린 배기가스 규제 대응을 위하여 삼원 촉매를 기본으로 하는 기술을 적용하고 있다. The conventional vehicle is applying a technology based on a three-way catalyst in order to respond to gasoline emission regulations.

가솔린 배기가스는 대부분 냉시동 시에 발생하므로, 삼원 촉매의 저온 활성은 대단히 중요하다. 이에, 종래에는 초박벽 담체를 적용하여 삼원 촉매가 저온에서 활성되도록 하거나, 엔진 제어 측면에서 희박 시동(lean start) 및 촉매 가열 기능을 적용하곤 한다. Since gasoline exhaust gases are mostly generated during cold start, the low temperature activity of the three-way catalyst is very important. Therefore, in the related art, an ultra-thin wall carrier is applied to enable the three-way catalyst to be activated at a low temperature, or to apply a lean start and a catalyst heating function in terms of engine control.

그러나, 상기 기술을 적용한다 하더라도 배기가스의 정화율 50%에 도달하는 온도는 대개 350도 정도이므로, 촉매 활성 온도를 낮추기 위한 제안이 지속적으로 이루어지고 있다. However, even if the above technique is applied, since the temperature reaching 50% of the purification rate of the exhaust gas is usually about 350 degrees, proposals for lowering the catalyst active temperature have been made continuously.

하지만, 북미 지역 COLD NMHC(비메탄 탄화수소, Non-Methane HydroCarbons) 규제는 영하 7도에서 시동이 걸리는 조건으로서 현재의 촉매 기술로는 대응이 어려운 상황이다. 하나의 대안으로 제시되는 기술은 탄화수소 흡착(이하, HC TRAP 이라고 칭함) 기술이다.However, North American COLD NMHC (Non-Methane HydroCarbons) regulation is a condition that starts at minus 7 degrees, which is difficult to cope with current catalyst technology. One alternative technique is hydrocarbon adsorption (hereinafter referred to as HC TRAP) technique.

종래의 촉매 장치는 도 1에 도시된 바와 같다. 즉, 종래 촉매 장치는 담체벽(110)과, 담체벽(110) 상에 순차적으로 코팅된 HC 흡착층(120) 및 삼원 촉매층(140)으로 구성되어 있다. The conventional catalyst device is as shown in FIG. That is, the conventional catalyst device is composed of the carrier wall 110, the HC adsorption layer 120 and the three-way catalyst layer 140 sequentially coated on the carrier wall (110).

이러한 구성에 의하여, HC가 흡착되는 원리에 대해 간단히 설명하면 아래와 같다. By such a configuration, the principle of HC adsorption is briefly described as follows.

냉시동 시 초기 배출되는 HC는 삼원 촉매층(140)이 활성화되는 온도 이전에 테일 파이프(TAIL PIPE)로 배출될 수 밖에 없으나, HC 흡착층(120)에 의해 흡착 저장된다.HC, which is initially discharged during cold startup, may be discharged to the tail pipe before the temperature at which the three-way catalyst layer 140 is activated, but is adsorbed and stored by the HC adsorption layer 120.

HC 흡착층(120)에서 HC가 흡착되는 동안 배기가스 온도는 상승하여 삼원 촉매층(140)은 저온 활성 도달 온도(대략 200도 이상)에 이르게 된다. While HC is adsorbed in the HC adsorption layer 120, the exhaust gas temperature rises, and the three-way catalyst layer 140 reaches a low temperature active attainment temperature (about 200 degrees or more).

이와 같이, 삼원 촉매층(140)이 활성화된 후, HC 흡착층(120)에서 흡착되어 있던 HC가 탈착되고, 활성화 온도에 도달한 삼원 촉매층(140)에서 HC의 정화가 이루어진다. As such, after the three-way catalyst layer 140 is activated, HC adsorbed in the HC adsorption layer 120 is desorbed, and the HC is purified in the three-way catalyst layer 140 reaching the activation temperature.

그러나, 종래 촉매 장치에 의하면, 도 2에 도시된 그래프와 같이, HC 흡착층(120)에 HC의 흡착이 이루어지나, HC가 탈착되는 온도에서 삼원 촉매층(140)의 활성화가 이루어지지 않아 HC가 정화되지 않는 문제점이 있었다. 즉, 삼원 촉매층(140)이 50% 활성화되기 위한 온도는 360도 정도이나, HC 흡착층(120)에서 HC가 탈착되기 시작하는 온도는 150도부터 시작되므로, HC 흡착층(120)에서 저장되었던 HC가 정화되지 못하고, 테일 파이프로 배출되므로 COLD NMHC 정화가 불가한 문제점이 있었다. However, according to the conventional catalyst apparatus, as shown in the graph shown in FIG. 2, HC is adsorbed to the HC adsorption layer 120, but HC is not activated because the three-way catalyst layer 140 is not activated at a temperature at which HC is desorbed. There was an issue that was not cleaned. That is, the temperature for activating the three-way catalyst layer 140 at about 50% is about 360 degrees, but since the temperature at which HC starts to be desorbed in the HC adsorption layer 120 starts at 150 degrees, the HC adsorption layer 120 was stored. Since HC could not be purified and discharged into the tail pipe, there was a problem that COLD NMHC purification was impossible.

상기 종래의 문제점을 해결하기 위한 방법으로 두가지로 요약할 수 있다.As a method for solving the conventional problems, it can be summarized in two ways.

HC 흡착층(120)에서 HC가 탈착되는 온도를 삼원 촉매층(140)가 활성화되는 온도까지 상승시키거나, 삼원 촉매층(140)의 활성화 온도를 HC 흡착층(120)에서 HC가 탈착되는 온도 영역까지 낮추는 것이다. The temperature at which HC is desorbed in the HC adsorption layer 120 is increased to a temperature at which the three-way catalyst layer 140 is activated, or the activation temperature of the three-way catalyst layer 140 is at a temperature range where HC is desorbed from the HC adsorption layer 120. To lower it.

이에, 본 발명자는 두번째 방법인 삼원 촉매층(140)의 활성 온도 낮추는 방안을 강구하였다.Therefore, the inventors have devised a method of lowering the active temperature of the three-way catalyst layer 140, which is the second method.

따라서, 본 발명의 목적은 저온에서도 CO를 정화하는 CO 저온 산화층을 구비하여, 저온에서 CO가 산화되면서 발생되는 반응열을 이용하여 삼원 촉매층의 온도를 빠르게 높여주고, 이를 통해 저온에서 활성화되어 HC 흡착층에 저장된 HC의 배출을 억제할 수 있는 차량의 촉매 장치를 제공하는 것이다. Accordingly, an object of the present invention is to provide a low-temperature oxide CO layer to purify CO even at low temperatures, by using the reaction heat generated as CO is oxidized at low temperatures to quickly increase the temperature of the three-way catalyst layer, which is activated at low temperatures through the HC adsorption layer It is to provide a catalyst device for a vehicle capable of suppressing the emission of HC stored in the vehicle.

상기 목적은 본 발명의 차량의 촉매 장치에 따라, 담체벽과; 상기 담체벽 상에 코팅되어 HC를 흡착하는 HC 흡착층과; 상기 HC 흡착층 상에 코팅되어 저온에서 CO를 정화하는 CO 저온 산화층과; 상기 CO 저온 산화층 상에 코팅된 삼원 촉매층에 의해 달성된다.The object is, according to the catalyst device of the vehicle of the present invention, a carrier wall; An HC adsorption layer coated on the carrier wall to adsorb HC; A CO low temperature oxide layer coated on the HC adsorption layer to purify CO at low temperature; It is achieved by a three-way catalyst layer coated on the CO low temperature oxide layer.

여기서, 상기 CO 저온 산화층은 은 합금과, 타이타니아(TiO2)로 구성된 지지체와, 세리아로 구성된 조촉매를 포함하여 이루어진 것이 바람직하다.Here, the CO low temperature oxide layer preferably comprises a silver alloy, a support composed of titania (TiO 2 ), and a promoter composed of ceria.

상기 CO 저온 산화층은 100도 이하의 온도에서 CO의 산화 반응을 시작하여, 그 발열량에 의해 상기 삼원 촉매층을 웜업시키는 것이 바람직하다.The CO low temperature oxidation layer preferably initiates an oxidation reaction of CO at a temperature of 100 degrees or less, and warms up the three-way catalyst layer by the calorific value.

한편, 상기 목적은 본 발명의 차량의 촉매 장치에 따라, 담체벽과; 상기 담체벽 상에 코팅되어 HC를 흡착하는 HC 흡착층과; 상기 HC 흡착층 상에 코팅되어 저온에서 CO를 정화하는 기능을 포함하는 삼원 촉매층에 의해 달성된다. On the other hand, the above object is, according to the catalyst device of the vehicle of the present invention, the carrier wall; An HC adsorption layer coated on the carrier wall to adsorb HC; It is achieved by a three-way catalyst layer coated on the HC adsorption layer and comprising a function of purifying CO at low temperatures.

여기서, 상기 삼원 촉매층에는 은 합금과, 타이타니아(TiO2)로 구성된 지지체와, 세리아로 구성된 조촉매를 포함하여 이루어진 것이 좋다.Here, the three-way catalyst layer may include a silver alloy, a support composed of titania (TiO 2 ), and a promoter composed of ceria.

상기 삼원 촉매층은 100도 이하의 온도에서 CO의 산화 반응을 시작하여, 그 발열량에 의해 웜업되는 것이 바람직하다.The three-way catalyst layer starts the oxidation reaction of CO at a temperature of 100 degrees or less, and is warmed up by the calorific value.

이상 설명한 바와 같이, 본 발명에 따르면, 저온에서 CO를 활성화하여 이 때 발생된 반응열을 이용하여 삼원 촉매층의 온도를 급격히 상승시킴으로써, HC 흡착층에 탈착된 HC가 정화되지 않고 배출되는 것을 방지할 수 있는 차량의 촉매 장치가 제공된다. As described above, according to the present invention, by activating CO at low temperature and rapidly raising the temperature of the three-way catalyst layer by using the reaction heat generated at this time, it is possible to prevent the HC desorbed to the HC adsorption layer from being discharged without being purified. A catalytic device of a vehicle is provided.

도 1은 종래 차량의 촉매 장치를 나타낸 개략도.
도 2는 종래 촉매 장치의 문제점을 설명하기 위한 시간-HC 농도간의 그래프.
도 3은 본 발명에 따른 차량의 촉매 장치를 나타낸 개략도.
도 4는 종래와 본 발명의 CO 산화 특성을 비교한 그래프.1 is a schematic view showing a catalyst device of a conventional vehicle.
2 is a graph of time-HC concentration for explaining the problem of the conventional catalyst device.
3 is a schematic view showing a catalyst device of a vehicle according to the present invention.
4 is a graph comparing the CO oxidation characteristics of the prior art and the present invention.

이하에서는 첨부도면을 참조하여 본 발명에 대해 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

본 발명에 따른 차량의 촉매 장치는, 도 3에 도시된 바와 같이, 담체벽(10)과, 담체벽(10) 상에 코팅되어 HC를 흡착하는 HC 흡착층(20)과, HC 흡착층(20) 상에 코팅되어 저온에서 CO를 정화하는 CO 저온 산화층(30)과, CO 저온 산화층(30) 상에 코팅된 삼원 촉매층(40)으로 구성된다. As shown in FIG. 3, the catalyst device of the vehicle according to the present invention includes a carrier wall 10, a HC adsorption layer 20 coated on the carrier wall 10 to adsorb HC, and an HC adsorption layer ( 20) is composed of a CO low temperature oxide layer 30 coated on the CO low temperature oxide layer 30 and coated on the CO low temperature oxide layer 30 to purify the CO at low temperature.

HC 흡착층(20)은 일반적으로 제올라이트로 이루어져, 배기가스에 포함된 HC를 흡착하는 기능을 한다.The HC adsorption layer 20 generally consists of zeolite and functions to adsorb HC contained in the exhaust gas.

CO 저온 산화층(30)은 은 합금과, 타이타니아(TiO2)로 구성된 지지체와, 세리아(Seria)로 구성된 조촉매로 이루어져, HC 흡착층(20)과 삼원 촉매층(40) 사이에 코팅된다. 이러한 CO 저온 산화층(30)은 100도 이하의 저온에서 CO 산화 반응을 시작하여, 이 때 발생된 발열량에 의해 삼원 촉매층(40)의 온도가 급격히 상승된다. 따라서, CO 저온 산화층(30)은 HC 흡착층(20)에 저장되었던 HC가 탈착되는 온도 이전에 삼원 촉매층(40)의 활성화를 유도함으로써, 탈착된 HC가 반응에 의해 정화될 수 있다.The CO low temperature oxide layer 30 is composed of a silver alloy, a support composed of titania (TiO 2 ), and a promoter composed of ceria (Seria), and is coated between the HC adsorption layer 20 and the three-way catalyst layer 40. The CO low temperature oxidation layer 30 starts the CO oxidation reaction at a low temperature of 100 degrees or less, and the temperature of the three-way catalyst layer 40 is rapidly increased by the calorific value generated at this time. Therefore, the CO low temperature oxide layer 30 induces activation of the three-way catalyst layer 40 before the temperature at which HC stored in the HC adsorption layer 20 is desorbed, whereby the desorbed HC can be purified by the reaction.

한편, 종래 촉매 장치와 본 발명의 촉매 장치의 CO 산화 특성을 비교하면 도 5와 같다. 즉, 본 발명의 CO 저온 산화층(30)에 의한 CO 저온 활성은 50도에서 이미 50% 정도의 정화율에 도달되는데, 이는 종래의 삼원 촉매층의 활성 온도 150도 보다 100도 이상 낮은 수준임을 알 수 있다. 따라서, HC 흡착층(20)에 흡착되었던 HC가 탈착되는 온도인 100도 부근에서는 이미 CO 저온 산화층(30)과 삼원 촉매층(40)의 LOT(Light Off Time)가 도달되어 COLD NMHC 규제 대응이 가능하다.On the other hand, comparing the CO oxidation characteristics of the conventional catalyst device and the catalyst device of the present invention is as shown in FIG. That is, the low temperature CO activity by the CO low temperature oxide layer 30 of the present invention reaches a purification rate of about 50% at 50 degrees, which is 100 degrees lower than the active temperature 150 degrees of the conventional three-way catalyst layer. have. Therefore, the LOT (Light Off Time) of the CO low-temperature oxidized layer 30 and the three-way catalyst layer 40 has already reached around 100 degrees C at which the HC which has been adsorbed on the HC adsorption layer 20 is desorbed. Do.

이 때, LOT란 촉매 장치에 유입되는 배기가스의 온도를 서서히 올리면서 정화 효율을 측정함에 있어서 측정된 정화 효율이 50%가 될 때의 배기가스 온도를 말한다. At this time, LOT refers to the exhaust gas temperature when the purification efficiency measured becomes 50% in measuring the purification efficiency while gradually raising the temperature of the exhaust gas flowing into the catalyst device.

이러한 구성에 의하여, 저온에서 CO를 활성화하여 이 때 발생된 반응열을 이용하여 삼원 촉매층(40)의 온도를 급격히 상승시킴으로써, HC 흡착층(20)에 탈착된 HC가 정화되지 않고 배출되는 것을 방지할 수 있다. By such a configuration, by activating CO at low temperature and rapidly raising the temperature of the three-way catalyst layer 40 by using the reaction heat generated at this time, it is possible to prevent HC desorbed to the HC adsorption layer 20 from being discharged without being purified. Can be.

전술한 실시예에서는 CO 저온 산화층이 HC 흡착층과 삼원 촉매층 사이에 코팅되어 3개의 촉매층으로 이루어져 있으나, 삼원 촉매층에 CO 저온 산화층을 구성하는 성분이 혼합되어 2개의 촉매층으로 구성될 수도 있음은 물론이다.In the above-described embodiment, the CO low temperature oxide layer is coated between the HC adsorption layer and the three-way catalyst layer, and consists of three catalyst layers. However, the three-way catalyst layer may be composed of two catalyst layers by mixing the components constituting the CO low temperature oxide layer. .

10 : 담체벽 20 : HC 흡착층
30 : CO 저온 산화층 40 : 삼원 촉매층10 carrier wall 20 HC adsorption layer
30: CO low temperature oxide layer 40: three-way catalyst layer

Claims (6)

담체벽과;
상기 담체벽 상에 코팅되어 HC를 흡착하는 HC 흡착층과;
상기 HC 흡착층 상에 코팅되어 저온에서 CO를 정화하는 CO 저온 산화층과;
상기 CO 저온 산화층 상에 코팅된 삼원 촉매층으로 구성된 차량의 촉매 장치.A carrier wall;
An HC adsorption layer coated on the carrier wall to adsorb HC;
A CO low temperature oxide layer coated on the HC adsorption layer to purify CO at low temperature;
Catalyst device of a vehicle consisting of a three-way catalyst layer coated on the CO low temperature oxide layer. 청구항 1에 있어서,
상기 CO 저온 산화층은 은 합금과, 타이타니아(TiO2)로 구성된 지지체와, 세리아로 구성된 조촉매를 포함하여 이루어진 것을 특징으로 하는 차량의 촉매 장치.The method according to claim 1,
The CO low temperature oxide layer comprises a silver alloy, a support composed of titania (TiO 2 ), and the catalyst device of a vehicle, characterized in that made of a ceria. 청구항 1에 있어서,
상기 CO 저온 산화층은 100도 이하의 온도에서 CO의 산화 반응을 시작하여, 그 발열량에 의해 상기 삼원 촉매층을 웜업시키는 것을 특징으로 하는 차량의 촉매 장치.The method according to claim 1,
The CO low temperature oxidation layer starts the oxidation reaction of CO at a temperature of 100 degrees or less, and warms up the three-way catalyst layer by the calorific value. 담체벽과;
상기 담체벽 상에 코팅되어 HC를 흡착하는 HC 흡착층과;
상기 HC 흡착층 상에 코팅되어 저온에서 CO를 정화하는 기능을 포함하는 삼원 촉매층으로 구성된 차량의 촉매 장치.A carrier wall;
An HC adsorption layer coated on the carrier wall to adsorb HC;
A catalyst device for a vehicle, comprising a three-way catalyst layer coated on the HC adsorption layer and having a function of purifying CO at low temperature. 청구항 4에 있어서,
상기 삼원 촉매층에는 은 합금과, 타이타니아(TiO2)로 구성된 지지체와, 세리아로 구성된 조촉매를 포함하여 이루어진 것을 특징으로 하는 차량의 촉매 장치.The method of claim 4,
The three-way catalyst layer is a catalyst device of a vehicle comprising a silver alloy, a support made of titania (TiO 2 ), and a cocatalyst made of ceria. 청구항 4에 있어서,
상기 삼원 촉매층은 100도 이하의 온도에서 CO의 산화 반응을 시작하여, 그 발열량에 의해 웜업되는 것을 특징으로 하는 차량의 촉매 장치.
The method of claim 4,
The three-way catalyst layer starts the oxidation reaction of CO at a temperature of 100 degrees or less, and warms up by the calorific value.
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