JP2003112049A - Three-layer ternary catalyst - Google Patents
Three-layer ternary catalystInfo
- Publication number
- JP2003112049A JP2003112049A JP2001307380A JP2001307380A JP2003112049A JP 2003112049 A JP2003112049 A JP 2003112049A JP 2001307380 A JP2001307380 A JP 2001307380A JP 2001307380 A JP2001307380 A JP 2001307380A JP 2003112049 A JP2003112049 A JP 2003112049A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- catalyst layer
- layer
- carrier
- layer formed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 60
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000919 ceramic Substances 0.000 claims abstract description 7
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 5
- 239000010948 rhodium Substances 0.000 claims abstract description 5
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 4
- 229910052703 rhodium Inorganic materials 0.000 claims abstract description 4
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 25
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 7
- 229910002091 carbon monoxide Inorganic materials 0.000 abstract description 7
- 229930195733 hydrocarbon Natural products 0.000 abstract description 6
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 6
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 5
- 229910052763 palladium Inorganic materials 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 150000002739 metals Chemical class 0.000 abstract 1
- 238000000746 purification Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 229910052746 lanthanum Inorganic materials 0.000 description 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- BYFGZMCJNACEKR-UHFFFAOYSA-N Al2O Inorganic materials [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 102100022626 Glutamate receptor ionotropic, NMDA 2D Human genes 0.000 description 1
- 101000972840 Homo sapiens Glutamate receptor ionotropic, NMDA 2D Proteins 0.000 description 1
- 101100121112 Oryza sativa subsp. indica 20ox2 gene Proteins 0.000 description 1
- 101100121113 Oryza sativa subsp. japonica GA20OX2 gene Proteins 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910003076 TiO2-Al2O3 Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910001657 ferrierite group Inorganic materials 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
- B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
-
- 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
- B01D2255/20—Metals or compounds thereof
- B01D2255/206—Rare earth metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/209—Other metals
- B01D2255/2092—Aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/902—Multilayered catalyst
- B01D2255/9025—Three layers
-
- 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
- B01D2258/012—Diesel engines and lean burn gasoline engines
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】この発明は、排気ガス浄化用
触媒に関するものであり、特に、ガソリンエンジン等の
排気ガスを浄化することができる技術に関する。
【０００２】
【従来の技術】各種内燃機関が発する排気ガス中の有害
物質を低減する努力が各方面で続けられている。近年で
は特に地球規模での環境保護が話し合われ、技術面での
進展も加速しつつあるようである。例えばガソリンエン
ジンの排気ガスに関して言えば、一酸化炭素（ＣＯ）お
よび炭化水素（ＨＣ）をそれぞれ二酸化炭素（ＣＯ２）
および水へ酸化する反応と、窒素酸化物（ＮＯＸ）を窒
素ガスへ還元する反応とを同時に行う三元触媒が実用化
されている。他にも排気ガス浄化のため種々の触媒が開
発・使用されてきており、例として酸化触媒、還元触媒
等があげられる。
【０００３】
【発明が解決しようとする課題】しかし従来の三元触媒
等は、エンジンの空燃比により浄化効率が左右される問
題が存在した。最近の開発傾向として優れた燃費と低排
出炭酸ガスとを追求する目的で空燃比が高い希釈燃焼方
式を採用したエンジンが多くなっているため、排気ガス
中の酸素濃度が高くなり、従来の三元触媒では想定した
窒素酸化物除去の効果を達成できない状況も多かった。
また、従来触媒における窒素酸化物除去反応の作用温度
が例えば３５０℃以上と高いために、エンジン始動時や
アイドリング時などの排気ガスの温度が高くない状況下
においては効率的な処理を確立することは難しかったの
である。
【０００４】本発明はこのような事情に鑑みてなされた
ものであり、炭化水素、一酸化炭素、および窒素酸化物
といった有害物質の確実な除去を高効率かつ低コストに
達成し、優れた耐久性を備える３層構造型三元触媒を提
供するものである。
【０００５】
【課題を解決するための手段】この発明は上記目的を達
成するためになされたもので、セラミック製や金属製の
ハニカム材やスポンジフィルタなどからなる担体が担持
する触媒層であって、前記担体表面に設けられパラジウ
ムを担持したアルミナを含む第１触媒層と、前記第１触
媒層表面に設けられプラチナを担持したアルミナを含む
第２触媒層と、前記第２触媒層表面に設けられロジウム
を担持したセリアを含む第３触媒層とからなることを特
徴とする。
【０００６】なお、前記担体の基材としては、例えば、
セラミックス製や金属製のものがあり、また形態として
も、ハニカム状のものや、スポンジフィルタ、パンチン
グチューブの如き多孔質状のものなどを例としてあげる
ことが出来る。実例として、セラミックモノリスにはコ
ージライトがあり、金属モノリスには波形の金属箔を巻
回し処理したもの等がある。酸化多孔質物質としては、
アルミナ（Ａｌ２Ｏ３）、ゼオライト、シリカ（ＳｉＯ
２）、ジルコニア（ＺｒＯ２）、チタニア（ＴｉＯ２）
等や、これらを複合させたＴｉＯ２−Ａｌ２Ｏ３、Ｓｉ
Ｏ２−Ａｌ２Ｏ ３、ＺｒＯ２−Ａｌ２Ｏ３等を挙げるこ
とができる。また、ゼオライトとしては、Ｙ型、Ａ型、
Ｘ型、Ｈ−Ｙ型、ZSM-5 、Ｈ-ZSM-5、シリカライト、モ
ルデナイト、フェリエライトなどがあげられる。
【０００７】
【発明の実施の形態】図１は本発明の３層構造型三元触
媒および従来型の２層触媒の層構造を比較して示す説明
図である。本実施形態において、従来品の触媒との比較
を行いつつ、本発明の３層構造型三元触媒について説明
することとする。本発明の３層構造型三元触媒の製作過
程例を概説するとすれば、３層の触媒層を構成する成分
の各粉末を作製し所定分量に秤量することから始まる。
次に、アルミナゾルなどを溶かした水溶液槽に、これら
の粉末を個別投入・攪拌し層別のスラリ槽をなす。そし
てセラミックハニカム（担体）をスラリ槽に浸漬した上
で引き上げを行い、かつ余分なスラリを吹き払った上
で、セラミックハニカムを乾燥、焼成して、触媒層を形
成する作業を層順に実施し３層構造を形成する。
【０００８】従来型の２層触媒と違って、本発明ではハ
ニカム担体１５上に第１触媒層１１、この第１触媒層１
１の上に第２触媒層１２、そしてこの第２触媒層１２の
上に第３触媒層１３を形成し、触媒層１０が成り立って
いるのである。各層の成分例として、第１触媒層１１に
はパラジウム／ランタン含有アルミナにセリアを添加し
たもの、第２触媒層１２にはプラチナ／ランタン含有ア
ルミナ、第３触媒層１３にはロジウム／ＺＣＮ酸化物と
いった例があげられるであろう。なおＺＣＮとは、Ｚｒ
・Ｃｅ・Ｎｄ複合酸化物を意味する。
【０００９】図２は本発明の３層構造型三元触媒と従来
品とのＦＴＰモード浄化率の比較状況を示すグラフであ
る（なお、発明の凡例は「Ａ」としている）。以下、本
発明の３層構造型三元触媒の機能検証の結果を述べる。
比較例として従来品の機能検証も併せて行っており、グ
ラフ中では凡例Ｂ、Ｃ、Ｄ、Ｅ、（つまりＡを除いたも
の）として示している。また、比較品の貴金属比（Ｐｔ
／Ｐｄ／Ｒｈ）と層構造に関しては下記の表１に示し
た。
【００１０】
【表１】
【００１１】本発明の３層構造型三元触媒および比較品
に対し、触媒処理条件：２．０Ｌエンジンエージング２
０時間処理、触媒搭載位置：エンジン直下、評価車両：
１．６Ｌエンジン搭載車両といった試験条件の下、ＦＴ
Ｐモードでの浄化率試験を実施すると、図２に示すよう
にＨＣ（炭化水素）、ＣＯ（一酸化炭素）、ＮＯＸ（窒
素酸化物）のいずれの浄化率に関しても本発明の３層構
造型三元触媒は優れた浄化特性を示すことが判明した。
試験の結果、特に窒素酸化物の浄化に高い能力を発揮し
ていることが見て取れる。
【００１２】
【発明の効果】以上に説明したように本発明によれば、
炭化水素、一酸化炭素、および窒素酸化物といった有害
物質の確実な除去を高効率かつ低コストに達成し、優れ
た耐久性を備える３層構造型三元触媒を提供可能とな
る。DETAILED DESCRIPTION OF THE INVENTION
[0001]
TECHNICAL FIELD The present invention relates to an exhaust gas purifying apparatus.
This is related to catalysts, especially for gasoline engines.
The present invention relates to a technology capable of purifying exhaust gas.
[0002]
2. Description of the Related Art Harmful emissions from various internal combustion engines
Efforts to reduce substances are continuing in every area. In recent years
Discusses environmental protection, especially on a global scale, and
Progress seems to be accelerating. For example, gasoline
When it comes to gin exhaust, carbon monoxide (CO)
And hydrocarbons (HC) are converted to carbon dioxide (CO2)
Oxidation to water and water and nitrogen oxides (NOX)
Commercialization of a three-way catalyst that simultaneously performs a reduction reaction to elemental gas
Have been. Various other catalysts have been opened to purify exhaust gas.
Oxidation catalysts, reduction catalysts
And the like.
[0003]
However, conventional three-way catalysts
Are questions that the purification efficiency depends on the air-fuel ratio of the engine.
There was a title. Excellent fuel economy and low emissions as recent development trends
Dilution combustion method with high air-fuel ratio in pursuit of carbon dioxide
Because the number of engines that use the formula is increasing, exhaust gas
The oxygen concentration in the inside becomes high, and it was assumed with the conventional three-way catalyst.
In many cases, the effect of removing nitrogen oxides could not be achieved.
In addition, the operating temperature of the nitrogen oxide removal reaction in the conventional catalyst
Is high, for example, 350 ° C. or higher,
When the exhaust gas temperature is not high, such as during idling
It was difficult to establish efficient processing in
It is.
[0004] The present invention has been made in view of such circumstances.
Hydrocarbons, carbon monoxide, and nitrogen oxides
High-efficiency and low-cost reliable removal of harmful substances such as
To provide a three-layer three-way catalyst with excellent durability.
To offer.
[0005]
The present invention achieves the above object.
Made of ceramic or metal
Carrier made of honeycomb material, sponge filter, etc. is carried
A catalyst layer provided on the surface of the carrier.
A first catalyst layer containing alumina supporting a catalyst;
Including platinum-supported alumina provided on the medium layer surface
A second catalyst layer; and rhodium provided on the surface of the second catalyst layer.
And a third catalyst layer containing ceria carrying
Sign.
[0006] As the base material of the carrier, for example,
Available in ceramic and metal
Also honeycomb-shaped, sponge filter, pantin
For example, a porous material such as a tube
I can do it. As an example, ceramic monoliths
The monolith is wrapped with corrugated metal foil.
Some of them are processed by turning. As oxidized porous substances,
Alumina (Al2O3), Zeolite, silica (SiO
2), Zirconia (ZrO)2), Titania (TiO2)
TiO2-Al2O3, Si
O2-Al2O 3, ZrO2-Al2O3Etc.
Can be. In addition, as the zeolite, Y type, A type,
X type, HY type, ZSM-5, H-ZSM-5, silicalite,
Rudenite, ferrierite and the like.
[0007]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
Explanation comparing the layer structure of the medium and the conventional two-layer catalyst
FIG. In this embodiment, comparison with a conventional catalyst
While describing the three-layer structure type three-way catalyst of the present invention
I decided to. Production of the three-layered three-way catalyst of the present invention
To outline the example, the components that make up the three catalyst layers
, And starts by weighing a predetermined amount of each powder.
Next, these are placed in an aqueous solution tank in which alumina sol is dissolved.
The powders are individually charged and stirred to form a slurry tank for each layer. Soshi
The ceramic honeycomb (carrier) in the slurry tank
And lift off the excess slurry
The ceramic honeycomb is dried and fired to form the catalyst layer.
The operations to be performed are performed in the order of layers to form a three-layer structure.
[0008] Unlike the conventional two-layer catalyst, in the present invention, c
The first catalyst layer 11 on the honeycomb carrier 15 and the first catalyst layer 1
1 on the second catalyst layer 12, and the second catalyst layer 12
The third catalyst layer 13 is formed thereon, and the catalyst layer 10 is formed.
It is. As an example of the components of each layer, the first catalyst layer 11
Adds ceria to palladium / lanthanum containing alumina
The second catalyst layer 12 contains platinum / lanthanum-containing
Luminous and rhodium / ZCN oxide are contained in the third catalyst layer 13.
An example would be given. ZCN is Zr
-It means Ce / Nd composite oxide.
FIG. 2 shows a three-layer catalyst of the present invention and a conventional three-way catalyst.
7 is a graph showing a comparison of an FTP mode purification rate with a product.
(Note that the legend of the invention is “A”). Below, the book
The results of function verification of the three-layer structure three-way catalyst of the invention will be described.
As a comparative example, the function verification of the conventional product was also performed.
In the rough, legends B, C, D, E,
). In addition, the precious metal ratio (Pt
/ Pd / Rh) and the layer structure are shown in Table 1 below.
Was.
[0010]
[Table 1]
The three-layered three-way catalyst of the present invention and a comparative product
On the other hand, catalyst treatment conditions: 2.0 L engine aging 2
0 hour treatment, catalyst loading position: just below the engine, evaluation vehicle:
Under test conditions such as 1.6L engine-mounted vehicles, FT
When the purification rate test is performed in the P mode, as shown in FIG.
HC (hydrocarbon), CO (carbon monoxide), NOX(Nit
Of the present invention with respect to any purification rate of
The molded three-way catalyst was found to exhibit excellent purification characteristics.
As a result of the test, it has demonstrated a high ability especially in nitrogen oxide purification.
You can see that
[0012]
As described above, according to the present invention,
Harmful, including hydrocarbons, carbon monoxide, and nitrogen oxides
Reliable removal of substances with high efficiency and low cost
To provide a three-layered three-way catalyst with excellent durability.
You.
【図面の簡単な説明】
【図１】本発明の３層構造型三元触媒および従来型の２
層触媒の層構造を比較して示す説明図である。
【図２】本発明の３層構造型三元触媒と従来品とのＦＴ
Ｐモード浄化率の比較状況を示すグラフである。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a three-layer catalyst of the present invention and a conventional two-way catalyst.
It is explanatory drawing which shows and compares the layer structure of a layer catalyst. FIG. 2 shows an FT of a three-layer catalyst of the present invention and a conventional product.
It is a graph which shows the comparison situation of a P mode purification rate.
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ０１Ｎ 3/10 Ｂ０１Ｊ 23/56 ＺＡＢ 3/28 ３０１ Ｂ０１Ｄ 53/36 １０４Ａ Ｆターム(参考） 3G091 AA02 AA17 AA28 AB03 BA07 BA14 BA15 BA19 BA39 GA06 GA20 GB01X GB04W GB05W GB06W GB07W GB10X GB16X GB17X 4D048 AA06 AA13 AA18 AB05 BA03X BA08X BA10X BA18X BA19X BA30X BA31X BA33X BA39Y BA41X BA42X BB02 BB09 BB16 4G069 AA03 BA01A BA13A BA13B BA17 BB02A BB02B BB04A BB06A BB06B BC43A BC44B BC51B BC71A BC71B BC72A BC72B BC75A BC75B CA03 CA09 EA14 EA18 EA19 EB11 EC29 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (Reference) F01N 3/10 B01J 23/56 ZAB 3/28 301 B01D 53/36 104A F-term (Reference) 3G091 AA02 AA17 AA28 AB03 BA07 BA14 BA15 BA19 BA39 GA06 GA20 GB01X GB04W GB05W GB06W GB07W GB10X GB16X GB17X 4D048 AA06 AA13 AA18 AB05 BA03X BA08X BA10X BA18X BA19X BA30X BA31X BA33X BA39Y BA41X BA42X BB02 BB09 BB16 4G069 AA03 BA01A BA13A BA13B BA17 BB02A BB02B BB04A BB06A BB06B BC43A BC44B BC51B BC71A BC71B BC72A BC72B BC75A BC75B CA03 CA09 EA14 EA18 EA19 EB11 EC29
Claims (1)
ポンジフィルタなどからなる担体が担持する触媒層であ
って、前記担体表面に設けられパラジウムを担持したア
ルミナを含む第１触媒層と、前記第１触媒層表面に設け
られプラチナを担持したアルミナを含む第２触媒層と、
前記第２触媒層表面に設けられロジウムを担持したセリ
アを含む第３触媒層とからなることを特徴とする３層構
造型三元触媒。Claims 1. A catalyst layer carried by a carrier made of a ceramic or metal honeycomb material or a sponge filter, the first catalyst layer comprising a palladium-supported alumina provided on the surface of the carrier. A catalyst layer, a second catalyst layer provided on the surface of the first catalyst layer and containing alumina carrying platinum,
A three-layer three-way catalyst comprising a third catalyst layer provided on the surface of the second catalyst layer and containing ceria carrying rhodium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001307380A JP2003112049A (en) | 2001-10-03 | 2001-10-03 | Three-layer ternary catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001307380A JP2003112049A (en) | 2001-10-03 | 2001-10-03 | Three-layer ternary catalyst |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003112049A true JP2003112049A (en) | 2003-04-15 |
Family
ID=19126851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001307380A Pending JP2003112049A (en) | 2001-10-03 | 2001-10-03 | Three-layer ternary catalyst |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003112049A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006297372A (en) * | 2005-03-24 | 2006-11-02 | Tokyo Roki Co Ltd | Catalyst for purification of exhaust gas |
| WO2009012348A1 (en) * | 2007-07-19 | 2009-01-22 | Basf Catalysts Llc | Multilayered catalyst compositions |
| EP1900416A3 (en) * | 2006-09-06 | 2009-04-01 | Mazda Motor Corporation | Exhaust gas catalytic conversion system |
| JP2010265795A (en) * | 2009-05-14 | 2010-11-25 | Mazda Motor Corp | Exhaust emission control device |
| JP2010264371A (en) * | 2009-05-14 | 2010-11-25 | Mazda Motor Corp | Exhaust gas purifying device |
| WO2017213105A1 (en) | 2016-06-07 | 2017-12-14 | 株式会社キャタラー | Exhaust gas purifying catalyst |
| CN110801834A (en) * | 2019-10-24 | 2020-02-18 | 浙江达峰汽车技术有限公司 | Catalyst coating for purifying automobile exhaust and preparation method thereof |
| US10960389B2 (en) | 2016-05-24 | 2021-03-30 | Cataler Corporation | Exhaust gas purification catalyst |
| CN116251592A (en) * | 2023-01-31 | 2023-06-13 | 昆明贵研催化剂有限责任公司 | Post-treatment catalyst for hybrid electric vehicle, preparation method and application thereof |
-
2001
- 2001-10-03 JP JP2001307380A patent/JP2003112049A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006297372A (en) * | 2005-03-24 | 2006-11-02 | Tokyo Roki Co Ltd | Catalyst for purification of exhaust gas |
| US7785545B2 (en) | 2006-09-06 | 2010-08-31 | Mazda Motor Corporation | Exhaust gas catalytic conversion system |
| EP1900416A3 (en) * | 2006-09-06 | 2009-04-01 | Mazda Motor Corporation | Exhaust gas catalytic conversion system |
| US8007750B2 (en) | 2007-07-19 | 2011-08-30 | Basf Corporation | Multilayered catalyst compositions |
| WO2009012348A1 (en) * | 2007-07-19 | 2009-01-22 | Basf Catalysts Llc | Multilayered catalyst compositions |
| JP2010265795A (en) * | 2009-05-14 | 2010-11-25 | Mazda Motor Corp | Exhaust emission control device |
| JP2010264371A (en) * | 2009-05-14 | 2010-11-25 | Mazda Motor Corp | Exhaust gas purifying device |
| US10960389B2 (en) | 2016-05-24 | 2021-03-30 | Cataler Corporation | Exhaust gas purification catalyst |
| WO2017213105A1 (en) | 2016-06-07 | 2017-12-14 | 株式会社キャタラー | Exhaust gas purifying catalyst |
| CN110801834A (en) * | 2019-10-24 | 2020-02-18 | 浙江达峰汽车技术有限公司 | Catalyst coating for purifying automobile exhaust and preparation method thereof |
| CN110801834B (en) * | 2019-10-24 | 2023-06-23 | 浙江达峰汽车技术有限公司 | Catalyst coating for purifying automobile exhaust and preparation method thereof |
| CN116251592A (en) * | 2023-01-31 | 2023-06-13 | 昆明贵研催化剂有限责任公司 | Post-treatment catalyst for hybrid electric vehicle, preparation method and application thereof |
| CN116251592B (en) * | 2023-01-31 | 2023-12-12 | 昆明贵研催化剂有限责任公司 | Post-treatment catalyst for hybrid electric vehicle, preparation method and application thereof |
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