JP2002322907A - Exhaust emission catalyst purifier of cylinder injection system engine and exhaust emission purifying method - Google Patents
Exhaust emission catalyst purifier of cylinder injection system engine and exhaust emission purifying methodInfo
- Publication number
- JP2002322907A JP2002322907A JP2001128823A JP2001128823A JP2002322907A JP 2002322907 A JP2002322907 A JP 2002322907A JP 2001128823 A JP2001128823 A JP 2001128823A JP 2001128823 A JP2001128823 A JP 2001128823A JP 2002322907 A JP2002322907 A JP 2002322907A
- Authority
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- Japan
- Prior art keywords
- cerium
- exhaust
- exhaust emission
- direct injection
- rare earth
- 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.)
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- Filtering Materials (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、筒内噴射式エンジ
ンの排気浄化技術において、特に、粒径の大きなＰＭ
（粒子状物質）を除去する技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purification technology for a direct injection type engine, and particularly to a PM having a large particle size.
The present invention relates to a technique for removing (particulate matter).
【０００２】[0002]
【従来の技術】従来から、ディーゼルエンジン，直接噴
射式ガソリンエンジンなどの筒内噴射式エンジンの排気
を浄化するために、種々の排気浄化触媒装置が案出され
てきた。排気浄化触媒装置の１つとして、例えば、特開
平１０−２０２１０７号公報に開示されるように、口径
が０．７〜２０．０nmの細孔を有する多孔質材に、貴金
属からなる活性成分とIIＡ族金属からなる添加成分とを
分散担持させたものが知られている。かかる排気浄化触
媒装置では、多孔質材の細孔によるＨＣ（炭化水素）の
トラップ、貴金属による低温活性、IIＡ族金属によるＣ
Ｏ（一酸化炭素）の浄化促進の相乗効果によって、炭素
数の多いＨＣ（炭素数６〜２０）とＣＯとが比較的低温
から浄化されている。2. Description of the Related Art Conventionally, various exhaust purifying catalyst devices have been devised for purifying exhaust gas of a direct injection type engine such as a diesel engine and a direct injection type gasoline engine. As one of exhaust gas purifying catalyst devices, for example, as disclosed in Japanese Patent Application Laid-Open No. 10-202107, a porous material having pores having a diameter of 0.7 to 20.0 nm, It is known that an additive component comprising a Group IIA metal is dispersed and supported. In such an exhaust purification catalyst device, trapping of HC (hydrocarbon) by pores of a porous material, low-temperature activity by a noble metal, and C by a IIA group metal
Due to the synergistic effect of promoting the purification of O (carbon monoxide), HC having a large number of carbon atoms (C6 to C20) and CO are purified from a relatively low temperature.
【０００３】[0003]
【発明が解決しようとする課題】ところで、筒内噴射式
エンジンには、ＨＣ及びＣＯの排出量が少ない反面、黒
煙などに代表されるＰＭの排出量が多いという特性があ
る。しかしながら、従来の排気浄化触媒装置では、多孔
質材の細孔口径が０．７〜２０．０nmに設定されている
ため、粒径の大きなＰＭはトラップされず、その大部分
が未浄化のまま大気中に排出されてしまっていた。The in-cylinder injection engine has a characteristic that it emits a small amount of HC and CO, but has a large amount of PM typified by black smoke and the like. However, in the conventional exhaust gas purifying catalyst device, since the pore diameter of the porous material is set to 0.7 to 20.0 nm, PM having a large particle size is not trapped, and most of the PM remains unpurified. Had been released into the atmosphere.
【０００４】そこで、本発明は以上のような従来の問題
点に鑑み、触媒担体の構造を見直すことにより、粒径の
大きなＰＭをも除去できるようにした筒内噴射式エンジ
ンの排気浄化触媒装置及び排気浄化方法を提供すること
を目的とする。Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and has been reviewed for the structure of the catalyst carrier, so that even a PM having a large particle diameter can be removed. And an exhaust gas purification method.
【０００５】[0005]
【課題を解決するための手段】このため、請求項１記載
の筒内噴射式エンジンの排気浄化触媒装置に係る発明で
は、排気通路に介装された触媒担体の基体表面に、貴金
属からなる活性成分と希土類金属からなる添加成分とを
分散担持させた口径２０〜３００nmの細孔を有する多孔
質材及びセリウム系複合酸化物をコートしたことを特徴
とする。Therefore, in the invention according to the first aspect of the present invention, there is provided an exhaust purification catalyst device for a direct injection type engine in which an active material made of a noble metal is formed on a surface of a base of a catalyst carrier provided in an exhaust passage. And a cerium-based composite oxide coated with a porous material having pores having a diameter of 20 to 300 nm in which the component and an additional component made of a rare earth metal are dispersed and supported.
【０００６】かかる構成によれば、筒内噴射式エンジン
から排出された排気は、排気通路を通って触媒担体に導
入されると、排気に含まれる粒径の大きな粒子状物質が
多孔質材の細孔にトラップされる。このため、エンジン
始動直後のように、活性成分としての貴金属が活性温度
以下であって、粒子状物質の酸化反応が十分行われない
状態であっても、粒子状物質が未浄化のまま大気中に排
出されることが防止される。一方、活性成分としての貴
金属が活性温度に達した後は、多孔質材にトラップされ
た粒子状物質は、ここに担持された貴金属からなる活性
成分により酸化され無害なＣＯ2（二酸化炭素）に転化
され、大気中に排出される。このとき、コートされたセ
リウム系複合酸化物は、酸素過剰雰囲気で酸素を吸蔵す
るので、粒子状物質の酸化反応温度が低下される。そし
て、粒子状物質の酸化反応温度の低下に加え、添加成分
としての希土類金属により、粒子状物質の酸化反応が促
進され、比較的低温から粒子状物質が浄化される。その
後は、粒子状物質のトラップと酸化反応が繰り返され、
粒子状物質の連続的な浄化が行われる。According to this structure, when the exhaust gas discharged from the in-cylinder injection engine is introduced into the catalyst carrier through the exhaust passage, the particulate matter having a large particle diameter contained in the exhaust gas becomes porous material. Trapped in the pores. For this reason, even when the noble metal as an active component is at or below the activation temperature and the oxidation reaction of the particulate matter is not sufficiently performed, such as immediately after the start of the engine, the particulate matter remains unpurified in the air. Is prevented from being discharged. On the other hand, after the precious metal as the active ingredient reaches the activation temperature, the particulate matter trapped in the porous material is oxidized by the active ingredient made of the noble metal carried here and converted into harmless CO 2 (carbon dioxide). Converted and released to the atmosphere. At this time, since the coated cerium-based composite oxide stores oxygen in an oxygen-excess atmosphere, the oxidation reaction temperature of the particulate matter is reduced. Then, in addition to lowering the oxidation reaction temperature of the particulate matter, the oxidation reaction of the particulate matter is promoted by the rare earth metal as an additional component, and the particulate matter is purified from a relatively low temperature. After that, the trapping of particulate matter and the oxidation reaction are repeated,
Continuous purification of particulate matter is performed.
【０００７】請求項２記載の筒内噴射式エンジンの排気
浄化触媒装置に係る発明では、前記貴金属は、白金Ｐｔ
であり、前記希土類金属は、セリウムＣｅ，ランタンＬ
ａ，ネオジムＮｄ，イットリウムＹ，プラセオジムＰ
ｒ，サマリウムＳｍから選ばれた少なくとも１つの金属
であることを特徴とする。かかる構成によれば、活性成
分としての貴金属を白金Ｐｔとすることで、ＰＭが効果
的に酸化される。また、添加成分としての希土類金属を
セリウムＣｅ，ランタンＬａ，ネオジムＮｄ，イットリ
ウムＹ，プラセオジムＰｒ，サマリウムＳｍから選ばれ
た少なくとも１つの金属とすることで、ＰＭの酸化が効
果的に促進される。In the invention according to a second aspect of the present invention, the noble metal is platinum Pt.
And the rare earth metal is cerium Ce, lanthanum L
a, Neodymium Nd, Yttrium Y, Praseodymium P
r, at least one metal selected from samarium Sm. According to this configuration, PM is effectively oxidized by using platinum Pt as the noble metal as the active component. Further, when the rare earth metal as an additive component is at least one metal selected from cerium Ce, lanthanum La, neodymium Nd, yttrium Y, praseodymium Pr, and samarium Sm, the oxidation of PM is effectively promoted.
【０００８】請求項３記載の筒内噴射式エンジンの排気
浄化触媒装置に係る発明では、前記セリウム系複合酸化
物は、セリアＣｅＯ2又はセリア−ジルコニア複合酸化
物ＣｅＯ2−ＺｒＯ2であることを特徴とする。かかる構
成によれば、セリウム系複合酸化物として、セリアＣｅ
Ｏ2又はセリア−ジルコニア複合酸化物ＣｅＯ2−ＺｒＯ
2が用いられることで、粒子状物質の酸化反応温度が効
果的に低下される。[0008] In the invention according to the exhaust purification catalyst device for a direct injection type engine according to claim 3, wherein the cerium complex oxide, ceria CeO 2 or ceria - that the zirconia composite oxide CeO 2 -ZrO 2 Features. According to this configuration, as the cerium-based composite oxide, ceria Ce
O 2 or ceria-zirconia composite oxide CeO 2 —ZrO
By using 2, the oxidation reaction temperature of the particulate matter is effectively reduced.
【０００９】請求項４記載の筒内噴射式エンジンの排気
浄化方法に係る発明では、排気通路に介装された触媒担
体の基体表面に、貴金属からなる活性成分と希土類金属
からなる添加成分とが分散担持された口径２０〜３００
nmを有する多孔質材及びセリウム系複合酸化物をコート
し、該多孔質材に筒内噴射式エンジンからの排気を接触
させて、該排気を浄化することを特徴とする。According to a fourth aspect of the present invention, there is provided a method for purifying exhaust gas of a direct injection engine, wherein an active component composed of a noble metal and an additive component composed of a rare earth metal are coated on the surface of a base of a catalyst carrier provided in an exhaust passage. Dispersion-supported caliber 20 to 300
It is characterized in that a porous material having a thickness of nm and a cerium-based composite oxide are coated, and exhaust gas from a direct injection engine is brought into contact with the porous material to purify the exhaust gas.
【００１０】かかる構成によれば、筒内噴射式エンジン
から排出された排気は、排気通路を通って触媒担体に導
入されると、排気に含まれる粒径の大きな粒子状物質が
多孔質材の細孔にトラップされる。このため、エンジン
始動直後のように、活性成分としての貴金属が活性温度
以下であって、粒子状物質の酸化反応が十分行われない
状態であっても、粒子状物質が未浄化のまま大気中に排
出されることが防止される。一方、活性成分としての貴
金属が活性温度に達した後は、多孔質材にトラップされ
た粒子状物質は、ここに担持された貴金属からなる活性
成分により酸化され無害なＣＯ2に転化され、大気中に
排出される。このとき、コートされたセリウム系複合酸
化物は、酸素過剰雰囲気で酸素を吸蔵するので、粒子状
物質の酸化反応温度が低下される。そして、粒子状物質
の酸化反応温度の低下に加え、添加成分としての希土類
金属により、粒子状物質の酸化反応が促進され、比較的
低温から粒子状物質が浄化される。その後は、粒子状物
質のトラップと酸化とが繰り返され、粒子状物質の連続
的な浄化が行われる。According to this configuration, when the exhaust gas discharged from the in-cylinder injection engine is introduced into the catalyst carrier through the exhaust passage, the particulate matter having a large particle size contained in the exhaust gas becomes porous material. Trapped in the pores. For this reason, even when the precious metal as the active component is at or below the activation temperature and the oxidation of the particulate matter is not sufficiently performed, such as immediately after the start of the engine, the particulate matter remains unpurified in the air. Is prevented from being discharged. On the other hand, after the precious metal as the active component reaches the activation temperature, the particulate matter trapped in the porous material is oxidized by the active component made of the precious metal carried here and converted into harmless CO 2 , Is discharged inside. At this time, the coated cerium-based composite oxide stores oxygen in an oxygen-excess atmosphere, so that the oxidation reaction temperature of the particulate matter is reduced. Then, in addition to lowering the oxidation reaction temperature of the particulate matter, the oxidation reaction of the particulate matter is promoted by the rare earth metal as an additional component, and the particulate matter is purified from a relatively low temperature. Thereafter, the trapping and oxidation of the particulate matter are repeated, and the continuous purification of the particulate matter is performed.
【００１１】[0011]
【発明の実施の形態】以下、添付された図面を参照して
本発明を詳述する。図１は、本発明を適用したモノリス
タイプの排気浄化触媒装置を示す。筒内噴射式エンジン
の排気通路１０には、保持部材１２を介して、ハニカム
形状の横断面を有するモノリスタイプの触媒担体１４が
介装される。触媒担体１４は、図２に示すように、セラ
ミックのコーディライトやＦｅ−Ｃｒ−Ａｌ系の耐熱鋼
からなる基体１４ａの表面に、多孔質材として、口径２
０〜３００nmの細孔を有する大細孔径アルミナＡとセリ
ウム系複合酸化物とを薄くコートすることで形成され
る。このコート層１４ｂは、通常「ウォッシュコート
層」と呼ばれる。なお、大細孔径アルミナＡは、細孔口
径のバラツキを抑えるために、例えば、ＰＨＳ（ｐＨス
ウィング）法により製造されることが望ましい。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the attached drawings. FIG. 1 shows a monolith type exhaust gas purifying catalyst device to which the present invention is applied. In the exhaust passage 10 of the in-cylinder injection engine, a monolith type catalyst carrier 14 having a honeycomb-shaped cross section is interposed via a holding member 12. As shown in FIG. 2, the catalyst carrier 14 is formed on a surface of a substrate 14a made of ceramic cordierite or Fe—Cr—Al-based heat-resistant steel, and has a diameter of 2 as a porous material.
It is formed by thinly coating a large pore diameter alumina A having pores of 0 to 300 nm and a cerium-based composite oxide. This coat layer 14b is usually called a "wash coat layer". The large-pore-diameter alumina A is desirably manufactured by, for example, a PHS (pH swing) method in order to suppress variations in the pore diameter.
【００１２】大細孔径アルミナＡには、貴金属からなる
活性成分と希土類金属からなる添加成分とが分散担持さ
れる。活性成分としての貴金属には、例えば、白金Ｐｔ
が用いられる。添加成分としての希土類金属には、例え
ば、セリウムＣｅ，ランタンＬａ，ネオジムＮｄ，イッ
トリウムＹ，プラセオジムＰｒ，サマリウムＳｍから選
ばれた少なくとも１つの金属が用いられる。セリウム系
複合酸化物には、例えば、セリアＣｅＯ2又はセリア−
ジルコニア複合酸化物ＣｅＯ2−ＺｒＯ2が用いられる。On the large pore diameter alumina A, an active component composed of a noble metal and an additive component composed of a rare earth metal are dispersedly supported. Noble metals as active ingredients include, for example, platinum Pt.
Is used. As the rare earth metal as the additional component, for example, at least one metal selected from cerium Ce, lanthanum La, neodymium Nd, yttrium Y, praseodymium Pr, and samarium Sm is used. Cerium-based composite oxides include, for example, ceria CeO 2 or ceria-
Zirconia composite oxide CeO 2 -ZrO 2 is used.
【００１３】次に、かかる構成からなる排気浄化触媒装
置の作用について説明する。筒内噴射式エンジンから排
出された排気は、排気通路１０を通って触媒担体１４に
導入されると、触媒担体１４のウォッシュコート１４ｂ
に接触する。このとき、排気に含まれる粒径の大きなＰ
Ｍは、口径２０〜３００nmの細孔を有する大細孔径アル
ミナＡによりトラップされる。このため、エンジン始動
直後のように、活性成分としての貴金属が活性温度以下
であって、ＰＭの酸化反応が十分行われない状態であっ
ても、ＰＭが未浄化のまま大気中に排出されることが抑
制され、排気性状を向上することができる。Next, the operation of the exhaust gas purifying catalyst device having the above configuration will be described. When the exhaust gas discharged from the in-cylinder injection type engine is introduced into the catalyst carrier 14 through the exhaust passage 10, the wash coat 14b of the catalyst carrier 14 is formed.
Contact At this time, P having a large particle size contained in the exhaust gas
M is trapped by large pore diameter alumina A having pores having a diameter of 20 to 300 nm. Therefore, even when the precious metal as an active component is at or below the activation temperature and the oxidation reaction of PM is not sufficiently performed, for example, immediately after the start of the engine, the PM is discharged to the atmosphere without purification. Is suppressed, and the exhaust properties can be improved.
【００１４】一方、活性成分としての貴金属が活性温度
に達した後は、大細孔径アルミナＡにトラップされたＰ
Ｍは、ここに分散担持される貴金属により酸化され、無
害なＣＯ2（二酸化炭素）に転化される。このとき、コ
ートされたセリウム系複合酸化物は、酸素過剰雰囲気で
酸素を吸蔵する特性を有しているため、ＰＭの酸化反応
温度を低下させる。そして、大細孔径アルミナＡにトラ
ップされたＰＭは、酸化反応温度の低下に加え、希土類
金属によりその酸化反応が促進され、比較的低温状態か
ら効果的に浄化されるようになる。その後は、ＰＭのト
ラップと酸化とが繰り返され、ＰＭの浄化が連続的に行
われるようになる。On the other hand, after the precious metal as the active component reaches the activation temperature, the P trapped in the large pore diameter alumina A
M is oxidized by the noble metal dispersed and supported therein, and is converted into harmless CO 2 (carbon dioxide). At this time, since the coated cerium-based composite oxide has a property of storing oxygen in an oxygen-excess atmosphere, the oxidation reaction temperature of PM is lowered. Then, the PM trapped in the large pore diameter alumina A is reduced in oxidation reaction temperature, and the oxidation reaction is promoted by the rare earth metal, so that the PM is effectively purified from a relatively low temperature state. After that, the trapping and oxidation of PM are repeated, and the purification of PM is continuously performed.
【００１５】このように、本発明に係る排気浄化触媒装
置によれば、ＰＭの連続浄化が可能となり、いわゆる
「Soot酸化触媒」を実現することができる。従って、排
気中にＰＭを多く含む筒内噴射式エンジンであっても、
本発明に係る排気浄化触媒装置を搭載すれば、ＰＭの連
続的な浄化が可能となり、地球環境を考慮したエンジン
とすることができる。As described above, according to the exhaust purification catalyst device of the present invention, continuous purification of PM becomes possible, and a so-called “Soot oxidation catalyst” can be realized. Therefore, even in a cylinder injection type engine containing a large amount of PM in the exhaust gas,
If the exhaust purification catalyst device according to the present invention is mounted, continuous purification of PM becomes possible, and an engine that considers the global environment can be provided.
【００１６】なお、以上説明した実施形態では、モノリ
スタイプの排気浄化触媒装置を前提としたが、ペレット
タイプの排気浄化触媒装置であっても、同様な作用及び
効果が奏されることは言うまでもない。In the above-described embodiment, a monolith type exhaust gas purifying catalyst device is assumed. However, it goes without saying that a pellet type exhaust gas purifying catalyst device has the same function and effect.
【００１７】[0017]
【発明の効果】以上説明したように、請求項１又は請求
項４に記載の発明によれば、粒径の大きな粒子状物質を
比較的低温から連続的に浄化できる。請求項２記載の発
明によれば、活性成分としての貴金属を白金Ｐｔとする
ことで、ＰＭを効果的に酸化させることができる。ま
た、添加成分としての希土類金属をセリウムＣｅ，ラン
タンＬａ，ネオジムＮｄ，イットリウムＹ，プラセオジ
ムＰｒ，サマリウムＳｍから選ばれた少なくとも１つの
金属とすることで、ＰＭの酸化を効果的に促進させるこ
とができる。As described above, according to the first or fourth aspect of the present invention, particulate matter having a large particle diameter can be continuously purified from a relatively low temperature. According to the invention of claim 2, PM can be effectively oxidized by using platinum Pt as the noble metal as the active component. Further, by using at least one metal selected from cerium Ce, lanthanum La, neodymium Nd, yttrium Y, praseodymium Pr, and samarium Sm as a rare earth metal as an additive component, the oxidation of PM can be effectively promoted. it can.
【００１８】請求項３記載の発明によれば、粒子状物質
の酸化反応温度を効果的に低下させることができる。According to the third aspect of the invention, the oxidation reaction temperature of the particulate matter can be effectively lowered.
【図１】本発明を適用したモノリスタイプの排気浄化触
媒装置の構成図FIG. 1 is a configuration diagram of a monolithic type exhaust purification catalyst device to which the present invention is applied.
【図２】触媒担体の基体にコートされた多孔質材の詳細
図FIG. 2 is a detailed view of a porous material coated on a substrate of a catalyst carrier.
【符号の説明】 Ａ 大細孔径アルミナ １０ 排気通路 １４ 触媒担体 １４Ａ 基体 １４Ｂ ウォッシュコート層[Description of Signs] A Large pore diameter alumina 10 Exhaust passage 14 Catalyst carrier 14A Base 14B Wash coat layer
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 3G090 AA03 BA01 4D019 AA01 BA05 BA06 BB06 BC07 BC12 CA01 CB04 4D048 AA14 AB01 BA03X BA08X BA10X BA18X BA19X BA30X BA31Y BA32Y BA33Y BA39X BA41X BA42X BB02 BB17 CC38 4G069 AA03 BA01A BA01B BA05A BA13A BA13B BA18 BB02A BB02B BB04A BB04B BB06A BB06B BC38A BC40A BC40B BC42A BC42B BC43A BC43B BC44A BC44B BC51A BC51B BC69A BC75A BC75B CA02 CA03 CA07 CA18 EA19 EC15X EC15Y EC16X EC16Y EC17X EC17Y ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) BB02A BB02B BB04A BB04B BB06A BB06B BC38A BC40A BC40B BC42A BC42B BC43A BC43B BC44A BC44B BC51A BC51B BC69A BC75A BC75B CA02 CA03 CA07 CA18 EA19 EC15X EC15Y EC16X EC16Y EC17X EC17Y
Claims (4)
に、貴金属からなる活性成分と希土類金属からなる添加
成分とを分散担持させた口径２０〜３００nmの細孔を有
する多孔質材及びセリウム系複合酸化物をコートしたこ
とを特徴とする筒内噴射式エンジンの排気浄化触媒装
置。1. A porous material having pores having a diameter of 20 to 300 nm, in which an active component composed of a noble metal and an additive component composed of a rare earth metal are dispersed and supported on the surface of a substrate of a catalyst carrier interposed in an exhaust passage. An exhaust purification catalyst device for a direct injection engine, which is coated with a cerium-based composite oxide.
類金属は、セリウムＣｅ，ランタンＬａ，ネオジムＮ
ｄ，イットリウムＹ，プラセオジムＰｒ，サマリウムＳ
ｍから選ばれた少なくとも１つの金属であることを特徴
とする請求項１記載の筒内噴射式エンジンの排気浄化触
媒装置。2. The noble metal is platinum Pt, and the rare earth metal is cerium Ce, lanthanum La, neodymium N
d, yttrium Y, praseodymium Pr, samarium S
2. The exhaust purification catalyst device for a direct injection engine according to claim 1, wherein the catalyst is at least one metal selected from the group consisting of m and m.
Ｏ2又はセリア−ジルコニア複合酸化物ＣｅＯ2−ＺｒＯ
2であることを特徴とする請求項１又は請求項２に記載
の筒内噴射式エンジンの排気浄化触媒装置。3. The cerium-based composite oxide is ceria Ce.
O 2 or ceria-zirconia composite oxide CeO 2 —ZrO
Exhaust purification catalyst device for a direct injection type engine according to claim 1 or claim 2, characterized in that it is 2.
に、貴金属からなる活性成分と希土類金属からなる添加
成分とが分散担持された口径２０〜３００nmを有する多
孔質材及びセリウム系複合酸化物をコートし、該多孔質
材に筒内噴射式エンジンからの排気を接触させて、該排
気を浄化することを特徴とする筒内噴射式エンジンの排
気浄化方法。4. A porous material having a caliber of 20 to 300 nm and a cerium-based composite in which an active component comprising a noble metal and an additional component comprising a rare earth metal are dispersed and supported on the surface of a substrate of a catalyst carrier provided in an exhaust passage. An exhaust purification method for a direct injection engine, comprising coating an oxide and contacting the porous material with exhaust gas from a direct injection engine to purify the exhaust gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001128823A JP2002322907A (en) | 2001-04-26 | 2001-04-26 | Exhaust emission catalyst purifier of cylinder injection system engine and exhaust emission purifying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001128823A JP2002322907A (en) | 2001-04-26 | 2001-04-26 | Exhaust emission catalyst purifier of cylinder injection system engine and exhaust emission purifying method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002322907A true JP2002322907A (en) | 2002-11-08 |
Family
ID=18977464
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001128823A Pending JP2002322907A (en) | 2001-04-26 | 2001-04-26 | Exhaust emission catalyst purifier of cylinder injection system engine and exhaust emission purifying method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002322907A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005329318A (en) * | 2004-05-19 | 2005-12-02 | Mazda Motor Corp | Diesel particulate filter |
| FR2875149A1 (en) * | 2004-09-15 | 2006-03-17 | Rhodia Chimie Sa | PROCESS FOR MANUFACTURING A CATALYSIS PARTICLE FILTER AND FILTER THUS OBTAINED |
| JP2007237005A (en) * | 2006-02-07 | 2007-09-20 | Dowa Holdings Co Ltd | Composite oxide for pm combustion catalyst and filter |
-
2001
- 2001-04-26 JP JP2001128823A patent/JP2002322907A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005329318A (en) * | 2004-05-19 | 2005-12-02 | Mazda Motor Corp | Diesel particulate filter |
| FR2875149A1 (en) * | 2004-09-15 | 2006-03-17 | Rhodia Chimie Sa | PROCESS FOR MANUFACTURING A CATALYSIS PARTICLE FILTER AND FILTER THUS OBTAINED |
| WO2006030120A1 (en) * | 2004-09-15 | 2006-03-23 | Rhodia Chimie | Method of producing a catalysed particulate filter and filter thus obtained |
| JP2008513195A (en) * | 2004-09-15 | 2008-05-01 | ロディア・シミ | Method for producing catalyst fine particle filter and filter obtained thereby |
| KR100865840B1 (en) * | 2004-09-15 | 2008-10-29 | 로디아 쉬미 | Method of producing a catalysed particulate filter and filter thus obtained |
| CN100553760C (en) * | 2004-09-15 | 2009-10-28 | 罗狄亚化学公司 | The production method of catalysed particulate filter and the filter that obtains thus |
| JP2007237005A (en) * | 2006-02-07 | 2007-09-20 | Dowa Holdings Co Ltd | Composite oxide for pm combustion catalyst and filter |
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