JP2001263051A - Exhaust emission control device for diesel engine - Google Patents
Exhaust emission control device for diesel engineInfo
- Publication number
- JP2001263051A JP2001263051A JP2000075972A JP2000075972A JP2001263051A JP 2001263051 A JP2001263051 A JP 2001263051A JP 2000075972 A JP2000075972 A JP 2000075972A JP 2000075972 A JP2000075972 A JP 2000075972A JP 2001263051 A JP2001263051 A JP 2001263051A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- exhaust gas
- diesel engine
- filter
- purifying apparatus
- 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
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 72
- 239000003054 catalyst Substances 0.000 claims abstract description 48
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 27
- 239000002131 composite material Substances 0.000 claims abstract description 16
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 9
- 239000011029 spinel Substances 0.000 claims abstract description 9
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 34
- 239000010419 fine particle Substances 0.000 claims description 22
- 238000000746 purification Methods 0.000 claims description 12
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 claims description 4
- 239000010410 layer Substances 0.000 claims description 4
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 229910000510 noble metal Inorganic materials 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 239000002245 particle Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 101100325793 Arabidopsis thaliana BCA2 gene Proteins 0.000 description 1
- 102100033041 Carbonic anhydrase 13 Human genes 0.000 description 1
- 229910018921 CoO 3 Inorganic materials 0.000 description 1
- 101000867860 Homo sapiens Carbonic anhydrase 13 Proteins 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Filtering Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】ディーゼルエンジンから排出
される排気中の窒素酸化物（ＮＯｘ）とカーボン微粒子
（Ｃ）とを浄化する排気浄化装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purification apparatus for purifying nitrogen oxides (NOx) and carbon fine particles (C) in exhaust gas discharged from a diesel engine.
【０００２】[0002]
【従来の技術】従来、ディーゼルエンジンから排出され
るカーボン微粒子を浄化する排気浄化装置としては、排
気中のＮＯを触媒が担持されたモノリスでＮＯ2に転化
し、そのＮＯ2とフィルタに捕獲されたカーボン微粒子
とを反応させることによりカーボン微粒子を浄化するも
の（特開平１−３１８７１５号公報、特開平１０−１５
９５５２号公報）あるいは、触媒を担持したフィルタ上
でＮＯをＮＯ2に転化しつつ捕獲されたカーボン微粒子
と反応させてＣＯ2に変換することでカーボン微粒子を
浄化するもの等がある。2. Description of the Related Art Conventionally, as an exhaust gas purifying apparatus for purifying carbon fine particles discharged from a diesel engine, NO in exhaust gas is converted into NO 2 by a monolith carrying a catalyst, and the NO 2 is captured by a filter. Purifying carbon fine particles by reacting the carbon fine particles (Japanese Patent Application Laid-Open Nos. 1-318715 and 10-15).
Alternatively, there is a method in which NO is converted to NO 2 on a filter supporting a catalyst and reacted with the captured carbon fine particles to convert the NO into CO 2 , thereby purifying the carbon fine particles.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前記い
ずれの装置においてもカーボン微粒子の浄化は可能であ
るが、有害物質であるＮＯｘについては、カーボン微粒
子浄化の途中、ＮＯ2とＣがＮＯ2＋Ｃ→ＣＯ＋ＮＯと反
応し、ＮＯ2がＮＯに変換されるだけで有害物質である
ＮＯがそのまま排出されてしまうといった問題があっ
た。However, any of the above-described apparatuses can purify carbon fine particles. However, as for NOx which is a harmful substance, NO 2 and C are converted into NO 2 + C → during the carbon fine particle purification. There is a problem that NO, which is a harmful substance, is discharged as it is only by reacting with CO + NO and converting NO 2 to NO.
【０００４】そこで、本発明は以上のような問題点に鑑
みなされたもので、ディーゼルエンジンから排出される
窒素酸化物（ＮＯｘ）とカーボン微微子（Ｃ）を同時に
浄化することを目的とする。The present invention has been made in view of the above problems, and has as its object to simultaneously purify nitrogen oxides (NOx) and carbon microparticles (C) discharged from a diesel engine.
【０００５】[0005]
【課題を解決するための手段】このため、請求項１に係
る発明は、排気中の一酸化窒素（ＮＯ）を次式のように
二酸化窒素（ＮＯ2）へと転化させる第一の触媒と、 ２ＮＯ＋Ｏ2→２ＮＯ2 上記転化された二酸化窒素（ＮＯ2）と排気中のカーボ
ン微粒子（Ｃ）とを次式のように順次反応させる第二の
触媒と、 ２ＮＯ2＋Ｃ→２ＮＯ＋ＣＯ2 ２ＮＯ＋Ｃ→Ｎ2＋ＣＯ2 により排気浄化を行うことを特徴とする。For this reason, the invention according to claim 1 comprises a first catalyst for converting nitrogen monoxide (NO) in exhaust gas into nitrogen dioxide (NO 2 ) as shown in the following formula. 2NO + O 2 → 2NO 2 A second catalyst for sequentially reacting the converted nitrogen dioxide (NO 2 ) with the carbon fine particles (C) in the exhaust gas as follows: 2NO 2 + C → 2NO + CO 2 2NO + C → N It is characterized by purifying exhaust gas with 2 + CO 2 .
【０００６】請求項２に係る発明は、前記第一の触媒
は、貴金属担持系酸化物であることを特徴とする。請求
項３に係る発明は、前記第二の触媒は、ペロブスカイト
複合酸化物あるいはスピネル複合酸化物であることを特
徴とする。The invention according to claim 2 is characterized in that the first catalyst is a noble metal-supported oxide. The invention according to claim 3 is characterized in that the second catalyst is a perovskite composite oxide or a spinel composite oxide.
【０００７】請求項４に係る発明は、上流側に前記第一
の触媒を担持したモノリスを配し、下流側に前記第二の
触媒を担持したフィルタを配したことを特徴とする。A fourth aspect of the present invention is characterized in that a monolith supporting the first catalyst is disposed on the upstream side, and a filter supporting the second catalyst is disposed on the downstream side.
【０００８】請求項５に係る発明は、前記モノリスと前
記フィルタとが同一保持部材により保持されていること
を特徴とする。The invention according to claim 5 is characterized in that the monolith and the filter are held by the same holding member.
【０００９】請求項６に係る発明は、前記第一の触媒と
前記第二の触媒とを担持したフィルタを設けたことを特
徴とする。The invention according to claim 6 is characterized in that a filter supporting the first catalyst and the second catalyst is provided.
【００１０】請求項７に係る発明は、前記第一の触媒は
表層に、前記第二の触媒は下層になるよう担持したフィ
ルタを設けたことを特徴とする。[0010] The invention according to claim 7 is characterized in that the first catalyst is provided in a surface layer, and the second catalyst is provided in a lower layer so as to carry a filter.
【００１１】請求項８に係る発明は、前記第一の触媒と
前記第二の触媒とを混合させて担持したフィルタを設け
たことを特徴とする。[0011] The invention according to claim 8 is characterized in that a filter is provided in which the first catalyst and the second catalyst are mixed and supported.
【００１２】[0012]
【発明の効果】請求項１に係る発明によれば、ディーゼ
ルエンジンから排出される窒素酸化物（ＮＯｘ）とカー
ボン微粒子（Ｃ）とを二つの触媒による三つの反応によ
り同時に浄化することができる。According to the first aspect of the present invention, nitrogen oxides (NOx) and carbon fine particles (C) discharged from a diesel engine can be simultaneously purified by three reactions using two catalysts.
【００１３】請求項２に係る発明によれば、第一の触媒
として貴金属担持系酸化物を用いることにより、ＮＯを
ＮＯ2へ効果的に転化させることができる。According to the second aspect of the present invention, NO can be effectively converted to NO 2 by using a noble metal-supported oxide as the first catalyst.
【００１４】請求項３に係る発明によれば、第二の触媒
としてペロブスカイト複合酸化物あるいは、スピネル複
合酸化物を用いることによりＮＯ2とカーボン微粒子と
を効果的に順次反応させてＮ2とＣＯ 2に変換することが
できる。According to the third aspect of the present invention, the second catalyst
As perovskite complex oxide or spinel complex
NO by using composite oxideTwoAnd carbon fine particles
Are effectively reacted in sequence to form NTwoAnd CO TwoCan be converted to
it can.
【００１５】請求項４に係る発明によれば、モノリスに
よりＮＯをＮＯ2へ転化させ、フィルタにより前記転化
されたＮＯ2とカーボン微粒子を反応させることにより
窒素酸化物とカーボン微粒子とを同時に浄化することが
できる。According to the fourth aspect of the present invention, NO is converted into NO 2 by a monolith, and the converted NO 2 and carbon fine particles are reacted by a filter to simultaneously purify nitrogen oxides and carbon fine particles. be able to.
【００１６】請求項５に係る発明によれば、前記モノリ
スと前記フィルタが同一保持部材により保持されるので
コンパクトな排気浄化装置に形成することができる。According to the fifth aspect of the present invention, the monolith and the filter are held by the same holding member, so that a compact exhaust gas purifying apparatus can be formed.
【００１７】請求項６に係る発明によれば、フィルタで
形成される単一の構造体で二つの触媒による三つの反応
を行うので、より軽量かつコンパクトな排気浄化装置に
形成することができる。According to the invention of claim 6, since three reactions are performed by two catalysts in a single structure formed by the filter, a lighter and more compact exhaust gas purifying apparatus can be formed.
【００１８】請求項７に係る発明によれば、表層により
ＮＯをＮＯ2へ転化させ、下層により前記転化されたＮ
Ｏ2とカーボン微粒子を反応させるをことにより窒素酸
化物とカーボン微粒子とを同時に浄化することができ
る。According to the present invention, NO is converted into NO 2 by the surface layer, and the converted N is converted by the lower layer.
By reacting O 2 and carbon fine particles, nitrogen oxides and carbon fine particles can be purified at the same time.
【００１９】請求項８に係る発明によれば、第一の触媒
と第二の触媒とを混合させて担持しているので、前記二
つの触媒による三つの反応が近接して行われ、より効率
的に窒素酸化物とカーボン微粒子を浄化することができ
る。According to the eighth aspect of the present invention, since the first catalyst and the second catalyst are mixed and supported, the three reactions by the two catalysts are performed in close proximity to each other, so that the efficiency is improved. Nitrogen oxides and carbon fine particles can be purified effectively.
【００２０】[0020]
【発明の実施の形態】以下に本発明の排気浄化について
説明する。本発明は、ディーゼルエンジンから排出され
る排気中のＮＯをＮＯ2へと転化させる第一の触媒と、
転化されたＮＯ2とカーボン微粒子とを順次反応させる
第二の触媒とによりＮ2とＣＯ2に変換することで排気浄
化を行うものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS Exhaust gas purification according to the present invention will be described below. The present invention comprises a first catalyst for the conversion of NO in the exhaust gas discharged from the diesel engine to NO 2,
The exhaust gas is purified by converting the converted NO 2 and carbon fine particles into N 2 and CO 2 using a second catalyst that sequentially reacts the converted NO 2 and carbon fine particles.
【００２１】ここで、第一の触媒としては、貴金属担持
系酸化物を用いる。例えば、白金（Ｐｔ）を担持したア
ルミナ（Ａｌ2Ｏ3）である。この触媒によりＮＯを
（１）式のようにＮＯ2へ転化させる。Here, a noble metal-supported oxide is used as the first catalyst. For example, alumina (Al 2 O 3 ) supporting platinum (Pt) is used. This catalyst converts NO into NO 2 as shown in equation (1).
【００２２】２ＮＯ＋Ｏ2→２ＮＯ2 …（１） 第二の触媒としては、ペロブスカイト複合酸化物また
は、スピネル複合酸化物を用いる。ペロブスカイト複合
酸化物としては、具体的には、以下のものが例として挙
げられる。2NO + O 2 → 2NO 2 (1) As the second catalyst, a perovskite composite oxide or a spinel composite oxide is used. Specific examples of the perovskite composite oxide include the following.
【００２３】Ｌａ0.9Ｋ0.1ＭｎＯ3 Ｌａ0.9Ｋ0.1ＣｏＯ3 Ｌａ0.9Ｋ0.1ＦｅＯ3 Ｌａ0.9Ｋ0.1Ｍｎ0.8Ｃｕ0.2Ｏ3 Ｌａ0.9Ｋ0.1Ｍｎ0.8Ｆｅ0.2Ｏ3 また、スピネル複合酸化物としては、ＣｕＦｅ2Ｏ4等が
ある。La 0.9 K 0.1 MnO 3 La 0.9 K 0.1 CoO 3 La 0.9 K 0.1 FeO 3 La 0.9 K 0.1 Mn 0.8 Cu 0.2 O 3 La 0.9 K 0.1 Mn 0.8 Fe 0.2 O 3 Further , as the spinel composite oxide, CuFe 2 O 4 and the like.
【００２４】この第二の触媒により、まず、前記転化さ
せたＮＯ2と後述するフィルタにより捕獲された排気中
のカーボン微粒子を（２）式のように反応させる。 ２ＮＯ2＋Ｃ→２ＮＯ＋ＣＯ2 …（２） ここで得られたＮＯは、排気中に存在したＮＯとは異な
り活性化された状態にあり、続いて（３）式のように反
応し、Ｎ2とＣＯ2となり排出される。First, the converted NO 2 is reacted with the carbon fine particles in the exhaust gas captured by a filter described later by the second catalyst as shown in equation (2). 2NO 2 + C → 2NO + CO 2 (2) Unlike the NO present in the exhaust gas, the NO obtained here is in an activated state, and subsequently reacts as in equation (3) to react with N 2 . CO 2 is emitted.
【００２５】２ＮＯ＋Ｃ→Ｎ2＋ＣＯ2 …（３） 次に、本発明の実施形態を図面に基づき説明する。図１
に示す排気浄化装置１は、図示しないディーゼルエンジ
ンの排気通路において上流側に保持部材１１に保持され
たモノリス２を配し、その下流側に保持部材１２に保持
されたパティキュレートフィルタ（以下フィルタとい
う。）３を配して構成される。2NO + C → N 2 + CO 2 (3) Next, an embodiment of the present invention will be described with reference to the drawings. FIG.
In the exhaust gas purifying apparatus 1 shown in FIG. 1, a monolith 2 held by a holding member 11 is arranged on an upstream side in an exhaust passage of a diesel engine (not shown), and a particulate filter (hereinafter referred to as a filter) held on a holding member 12 on the downstream side. .) 3.
【００２６】前記モノリス２は、例えばハニカム構造を
有する担体の表面に、図２に示すようにディーゼルエン
ジンから排出されたＮＯをＮＯ2へと転化させる第一の
触媒として貴金属担持系酸化物２１が担持されている。The monolith 2 has a noble metal-supporting oxide 21 as a first catalyst for converting NO discharged from a diesel engine to NO 2 on the surface of a carrier having, for example, a honeycomb structure as shown in FIG. It is carried.
【００２７】前記フィルタ３は、例えばセラミック等の
多孔性部材からなるハニカム状の隔壁により排気流と略
平行なセルが多数形成されており、各セルの入口と出口
とが封鎖材３２により、互い違い千鳥格子状に封鎖され
ている。そして、出口を塞がれたセル内の排気が隔壁を
介して入口が塞がれている隣接するセルに流入するとき
に排気のカーボン微粒子を捕獲する。The filter 3 has a large number of cells substantially parallel to the exhaust flow formed by honeycomb-shaped partitions made of a porous material such as ceramics. The inlet and outlet of each cell are alternately formed by a sealing material 32. It is closed in a houndstooth check. Then, when the exhaust gas in the cell whose outlet is closed flows into the adjacent cell whose inlet is closed via the partition, the carbon particles of the exhaust are captured.
【００２８】また、該フィルタ３には、図３に示すよう
に、前記した第一の触媒により転化されたＮＯ2と捕獲
したカーボン微粒子を前記（２）、（３）式のように順
次反応させる第二の触媒であるペロブスカイト複合酸化
物あるいはスピネル複合酸化物３１が担持されている。Further, the said filter 3, as shown in FIG. 3, the carbon particles were captured with NO 2 which is converted by the first catalyst described above (2), (3) the manner sequentially reacting A perovskite composite oxide or spinel composite oxide 31 as a second catalyst to be carried is supported.
【００２９】かかる構成によれば、モノリス２にてＮＯ
をＮＯ2に転化させ、フィルタ３にて前記転化されたＮ
Ｏ2と捕獲したカーボン微粒子とを反応させるので、デ
ィーゼルエンジンの排出する窒素酸化物とカーボン微粒
子とがそれぞれＮ2、ＣＯ2に変換されて浄化できる。According to this configuration, NO is used in the monolith 2.
Is converted to NO 2, and the converted N
Since O 2 reacts with the captured carbon fine particles, nitrogen oxides and carbon fine particles discharged from the diesel engine can be converted into N 2 and CO 2 respectively and purified.
【００３０】図４は、前記モノリス２とフィルタ３とが
同一保持部材４１により保持されている排気浄化装置で
ある。かかる構成をとれば、排気浄化装置をよりコンパ
クトに形成できる。FIG. 4 shows an exhaust gas purifying apparatus in which the monolith 2 and the filter 3 are held by the same holding member 41. With this configuration, the exhaust gas purification device can be formed more compact.
【００３１】図５は、前記モノリス２を廃し、フィルタ
３に貴金属担持系酸化物とペロブスカイト複合酸化物の
両方または、貴金属担持系酸化物とスピネル複合酸化物
の両方が担持された排気浄化装置である。FIG. 5 shows an exhaust purification system in which the monolith 2 is discarded and the filter 3 carries both a noble metal-supported oxide and a perovskite composite oxide, or both a noble metal-supported oxide and a spinel composite oxide. is there.
【００３２】ここで、フィルタ表面に担持された触媒
は、図６に示すように二つの触媒を混合させたもの６１
でも良いし、図７に示すように表層に貴金属担持系酸化
物２１を、下層にペロブスカイトあるいはスピネル複合
酸化物３１としたものでも良い。かかる構成によれば、
フィルタで形成される単一構造体で二つの触媒による三
つの反応を行うので、排気浄化装置をより軽量かつコン
パクトに形成できる。Here, the catalyst carried on the filter surface is a mixture of two catalysts as shown in FIG.
Alternatively, as shown in FIG. 7, a noble metal-supporting oxide 21 may be used for the surface layer, and a perovskite or spinel composite oxide 31 may be used for the lower layer. According to such a configuration,
Since three reactions are performed by two catalysts in a single structure formed by the filter, the exhaust gas purification device can be formed more lightweight and compact.
【図１】本発明の一実施形態である排気浄化装置の断面
図。FIG. 1 is a cross-sectional view of an exhaust gas purification device according to an embodiment of the present invention.
【図２】同じく図１、図４のＸ部の部分拡大図。FIG. 2 is a partially enlarged view of a portion X in FIGS. 1 and 4;
【図３】同じく図１、図４のＹ部の部分拡大図。FIG. 3 is a partially enlarged view of a Y part in FIGS. 1 and 4;
【図４】同じく他の実施形態である排気浄化装置。FIG. 4 is an exhaust gas purification apparatus according to another embodiment.
【図５】同じく他の実施形態である排気浄化装置。FIG. 5 is an exhaust gas purification apparatus according to another embodiment.
【図６】同じく図５のＺ部の部分拡大図FIG. 6 is a partially enlarged view of a portion Z in FIG. 5;
【図７】同じく図５のＺ部の部分拡大図7 is a partially enlarged view of a portion Z in FIG. 5;
１ 排気浄化装置 ２ モノリス ３ パティキュレートフィルタ ２１ 貴金属担持系酸化物 ３１ 複合酸化物 ６１ 貴金属担持系酸化物と複合酸化物の混合触媒 DESCRIPTION OF SYMBOLS 1 Exhaust gas purification apparatus 2 Monolith 3 Particulate filter 21 Noble metal carrying type oxide 31 Complex oxide 61 Mixed catalyst of noble metal carrying type oxide and complex oxide
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） Ｂ０１Ｊ 23/42 ＺＡＢ Ｂ０１Ｊ 23/78 Ａ 23/745 35/04 ３０１Ｅ 23/78 Ｆ０１Ｎ 3/02 ３０１Ｃ 23/889 ３０１Ｅ 35/04 ３０１ 3/10 Ａ Ｆ０１Ｎ 3/02 ３０１ Ｂ０１Ｄ 53/36 １０２Ｇ １０４Ａ 3/10 １０４Ｂ Ｂ０１Ｊ 23/74 ３０１Ａ 23/84 ３１１Ａ Ｆターム(参考） 3G090 AA02 AA06 EA02 EA03 3G091 AA18 AB02 AB05 AB13 BA00 BA14 FB10 GA06 GA24 GB01W GB02W GB04W GB05W GB10W HA10 HA14 HA15 HA27 HA47 4D019 AA01 BA05 BC07 BD10 CA01 CB01 4D048 AA06 AA14 AB01 AB02 AB05 BA03X BA14X BA18X BA28X BA30X BA31Y BA32Y BA33Y BA35X BA36X BA37X BA41X BA42X BB02 BB14 BB16 CC38 CC47 CD05 4G069 AA03 AA08 BA01A BA01B BA13A BA13B BB02A BB02B BB06A BB06B BC03A BC03B BC31A BC31B BC42A BC42B BC62A BC62B BC66A BC66B BC67A BC67B BC69A BC75A BC75B CA02 CA03 CA07 CA08 CA13 CA18 EA19 EA27 EC23 EC24 EC28 EC29 EE09 FA06 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (reference) B01J 23/42 ZAB B01J 23/78 A 23/745 35/04 301E 23/78 F01N 3/02 301C 23/889 301E 35 / 04 301 3/10 A F01N 3/02 301 B01D 53/36 102G 104A 3/10 104B B01J 23/74 301A 23/84 311A F-term (reference) 3G090 AA02 AA06 EA02 EA03 3G091 AA18 AB02 AB05 AB13 BA00 BA14 FB10 GA06 GA24 GB01W GB02W GB04W GB05W GB10W HA10 HA14 HA15 HA27 HA47 4D019 AA01 BA05 BC07 BD10 CA01 CB01 4D048 AA06 AA14 AB01 AB02 AB05 BA03X BA14X BA18X BA28X BA30X BA31Y BA32. BB02A BB02B BB06A BB06B BC03A BC03B BC31A BC31B BC42A BC42B BC62A BC62B BC66A BC66B BC67A BC67B BC69A BC75A BC75B CA02 CA03 CA07 CA08 CA13 CA18 EA19 EA27 EC23 EC24 EC28 EC29 EE09 FA06
Claims (8)
に二酸化窒素（ＮＯ2）へ転化させる第一の触媒と、 ２ＮＯ＋Ｏ2→２ＮＯ2 前記転化された二酸化窒素（ＮＯ2）と排気中のカーボ
ン微粒子（Ｃ）とを次式のように順次反応させる第二の
触媒と、 ２ＮＯ2＋Ｃ→２ＮＯ＋ＣＯ2 ２ＮＯ＋Ｃ→Ｎ2＋ＣＯ2 により排気浄化を行うことを特徴とするディーゼルエン
ジンの排気浄化装置。1. A first catalyst for converting nitrogen monoxide (NO) in exhaust gas into nitrogen dioxide (NO 2 ) as follows: 2NO + O 2 → 2NO 2 The converted nitrogen dioxide (NO 2 ) And a second catalyst for sequentially reacting the exhaust gas with carbon fine particles (C) in the exhaust gas, and purifying the exhaust gas by 2NO 2 + C → 2NO + CO 2 2NO + C → N 2 + CO 2 , Exhaust gas purification device.
ある請求項１記載のディーゼルエンジンの排気浄化装
置。2. The exhaust gas purifying apparatus for a diesel engine according to claim 1, wherein said first catalyst is a noble metal-supported oxide.
化物またはスピネル複合酸化物である請求項１記載のデ
ィーゼルエンジンの排気浄化装置。3. The exhaust gas purifying apparatus for a diesel engine according to claim 1, wherein the second catalyst is a perovskite composite oxide or a spinel composite oxide.
スを配し、 下流側に前記第二の触媒を担持したフィルタを配したこ
とを特徴とする請求項１〜３いずれか記載のディーゼル
エンジンの排気浄化装置。4. The method according to claim 1, wherein a monolith supporting the first catalyst is arranged on the upstream side, and a filter supporting the second catalyst is arranged on the downstream side. Diesel engine exhaust purification device.
部材により保持されていることを特徴とする請求項４記
載のディゼルエンジンの排気浄化装置。5. The exhaust gas purifying apparatus for a diesel engine according to claim 4, wherein said monolith and said filter are held by a same holding member.
したフィルタを設けたことを特徴とする請求項１〜３い
ずれか記載のディーゼルエンジンの排気浄化装置。6. An exhaust gas purifying apparatus for a diesel engine according to claim 1, further comprising a filter supporting said first catalyst and said second catalyst.
は下層になるよう担持したフィルタを設けたことを特徴
とする請求項６記載のディーゼルエンジンの排気浄化装
置。7. The exhaust gas purifying apparatus for a diesel engine according to claim 6, wherein a filter is provided so that the first catalyst is supported on a surface layer and the second catalyst is supported on a lower layer.
させて担持したフィルタを設けたことを特徴とする請求
項６記載のディーゼルエンジンの排気浄化装置。8. The exhaust gas purifying apparatus for a diesel engine according to claim 6, further comprising a filter that supports the first catalyst and the second catalyst in a mixed state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000075972A JP2001263051A (en) | 2000-03-17 | 2000-03-17 | Exhaust emission control device for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000075972A JP2001263051A (en) | 2000-03-17 | 2000-03-17 | Exhaust emission control device for diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001263051A true JP2001263051A (en) | 2001-09-26 |
Family
ID=18593783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000075972A Pending JP2001263051A (en) | 2000-03-17 | 2000-03-17 | Exhaust emission control device for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001263051A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1312776A2 (en) * | 2001-11-16 | 2003-05-21 | Isuzu Motors Limited | Exhaust gas purification system |
| JP2007203131A (en) * | 2006-01-31 | 2007-08-16 | Kobe Steel Ltd | Catalyst for nitrogen monoxide oxidation and oxidation method for nitrogen monoxide |
| JP2007296518A (en) * | 2006-04-07 | 2007-11-15 | Honda Motor Co Ltd | Catalyst and device for cleaning exhaust gas |
| WO2008060563A3 (en) * | 2006-11-15 | 2008-07-03 | Corning Inc | Flow-through honeycomb substrate and exhaust after treatment system and method |
| JP2008168229A (en) * | 2007-01-12 | 2008-07-24 | Okayama Univ | Catalyst for purifying nitrogen oxide in exhaust gas of diesel engine using unburnt carbon and nitrogen oxygen purifying method |
| WO2009025173A1 (en) | 2007-08-22 | 2009-02-26 | Honda Motor Co., Ltd. | Exhaust gas purification catalyst and exhaust gas purification apparatus using the exhaust gas purification catalyst |
| JP2009291753A (en) * | 2008-06-09 | 2009-12-17 | Dowa Electronics Materials Co Ltd | Exhaust gas clarifying catalyst, coating for exhaust gas clarifying catalyst, and diesel exhaust gas clarifying filter |
| JP2011056393A (en) * | 2009-09-09 | 2011-03-24 | Mitsubishi Motors Corp | Exhaust gas cleaning apparatus |
| JP2011189241A (en) * | 2010-03-12 | 2011-09-29 | Ngk Insulators Ltd | Honeycomb filter |
| JP2014061456A (en) * | 2012-09-19 | 2014-04-10 | Cataler Corp | Exhaust gas-purifying filter |
| WO2014141903A1 (en) | 2013-03-15 | 2014-09-18 | エヌ・イーケムキャット株式会社 | Oxidation catalyst and exhaust gas purification device using same |
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2000
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1312776A2 (en) * | 2001-11-16 | 2003-05-21 | Isuzu Motors Limited | Exhaust gas purification system |
| EP1312776A3 (en) * | 2001-11-16 | 2004-05-12 | Isuzu Motors Limited | Exhaust gas purification system |
| JP2007203131A (en) * | 2006-01-31 | 2007-08-16 | Kobe Steel Ltd | Catalyst for nitrogen monoxide oxidation and oxidation method for nitrogen monoxide |
| JP2007296518A (en) * | 2006-04-07 | 2007-11-15 | Honda Motor Co Ltd | Catalyst and device for cleaning exhaust gas |
| WO2008060563A3 (en) * | 2006-11-15 | 2008-07-03 | Corning Inc | Flow-through honeycomb substrate and exhaust after treatment system and method |
| US7491373B2 (en) | 2006-11-15 | 2009-02-17 | Corning Incorporated | Flow-through honeycomb substrate and exhaust after treatment system and method |
| JP2008168229A (en) * | 2007-01-12 | 2008-07-24 | Okayama Univ | Catalyst for purifying nitrogen oxide in exhaust gas of diesel engine using unburnt carbon and nitrogen oxygen purifying method |
| JP2009045584A (en) * | 2007-08-22 | 2009-03-05 | Honda Motor Co Ltd | Exhaust gas purification catalyst and exhaust gas purification device using it |
| WO2009025173A1 (en) | 2007-08-22 | 2009-02-26 | Honda Motor Co., Ltd. | Exhaust gas purification catalyst and exhaust gas purification apparatus using the exhaust gas purification catalyst |
| EP2191892A1 (en) * | 2007-08-22 | 2010-06-02 | Honda Motor Co., Ltd. | Exhaust gas purification catalyst and exhaust gas purification apparatus using the exhaust gas purification catalyst |
| EP2191892A4 (en) * | 2007-08-22 | 2012-05-02 | Honda Motor Co Ltd | Exhaust gas purification catalyst and exhaust gas purification apparatus using the exhaust gas purification catalyst |
| JP2009291753A (en) * | 2008-06-09 | 2009-12-17 | Dowa Electronics Materials Co Ltd | Exhaust gas clarifying catalyst, coating for exhaust gas clarifying catalyst, and diesel exhaust gas clarifying filter |
| JP2011056393A (en) * | 2009-09-09 | 2011-03-24 | Mitsubishi Motors Corp | Exhaust gas cleaning apparatus |
| JP2011189241A (en) * | 2010-03-12 | 2011-09-29 | Ngk Insulators Ltd | Honeycomb filter |
| JP2014061456A (en) * | 2012-09-19 | 2014-04-10 | Cataler Corp | Exhaust gas-purifying filter |
| WO2014141903A1 (en) | 2013-03-15 | 2014-09-18 | エヌ・イーケムキャット株式会社 | Oxidation catalyst and exhaust gas purification device using same |
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