JPH0427706A - Catalyst-type exhaust gas purifying device - Google Patents
Catalyst-type exhaust gas purifying deviceInfo
- Publication number
- JPH0427706A JPH0427706A JP2129850A JP12985090A JPH0427706A JP H0427706 A JPH0427706 A JP H0427706A JP 2129850 A JP2129850 A JP 2129850A JP 12985090 A JP12985090 A JP 12985090A JP H0427706 A JPH0427706 A JP H0427706A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- catalyst
- nox
- super
- upstream side
- 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.)
- Granted
Links
- 239000003054 catalyst Substances 0.000 claims abstract description 70
- 238000000746 purification Methods 0.000 claims abstract description 49
- 230000003197 catalytic effect Effects 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 12
- 239000013078 crystal Substances 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 36
- 229910052723 transition metal Inorganic materials 0.000 claims description 7
- 150000003624 transition metals Chemical class 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 229910000510 noble metal Inorganic materials 0.000 claims description 3
- 150000003384 small molecules Chemical class 0.000 abstract description 8
- 230000003647 oxidation Effects 0.000 abstract description 6
- 238000007254 oxidation reaction Methods 0.000 abstract description 6
- 229930195733 hydrocarbon Natural products 0.000 description 20
- 150000002430 hydrocarbons Chemical class 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 7
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 6
- 239000010457 zeolite Substances 0.000 description 6
- 229910021536 Zeolite Inorganic materials 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 229910001657 ferrierite group Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052680 mordenite Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、内燃機関の触媒式排ガス浄化装置に関して、
特に空燃比がリーン側となる酸素過剰雰囲気でも、ＮＯ
ｘを高率に浄化できる触媒、いゎゆるリーンＮＯｘ触媒
を用いた触媒式排ガス浄化装置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a catalytic exhaust gas purification device for an internal combustion engine.
Especially in an oxygen-rich atmosphere where the air-fuel ratio is on the lean side, NO
This invention relates to a catalytic exhaust gas purification device using a so-called lean NOx catalyst, which is a catalyst capable of purifying NOx at a high rate.
〔従来の技術］
低燃費化の要求から希薄混合気を燃焼させる（リーンバ
ーン）エンジンが知られている。このようなエンジンで
は設定空燃比をリーン例の酸素過剰雰囲気とするため、
排ガス中の有害成分のうち炭化水素（ＨＣ）、−酸化炭
素（ＣＯ）の酸化除去は容易であるが、窒素酸化物（Ｎ
Ｏｘ）は十分に還元除去することが困難となる。ＮＯＸ
の発生量はリーン雰囲気とすることにより減少するが、
従来の三元触媒では、リーン領域での還元能力は発揮で
きず、ＮＯｘの発生を十分に抑制することができなかっ
た。[Prior Art] Engines that burn a lean air-fuel mixture (lean burn) are known in response to demands for lower fuel consumption. In such engines, in order to set the air-fuel ratio to a lean atmosphere with excess oxygen,
Among the harmful components in exhaust gas, it is easy to oxidize and remove hydrocarbons (HC) and -carbon oxides (CO), but nitrogen oxides (N
Ox) is difficult to sufficiently reduce and remove. NOX
Although the amount of generation is reduced by creating a lean atmosphere,
Conventional three-way catalysts were unable to exhibit reduction ability in the lean region and were unable to sufficiently suppress the generation of NOx.
このため、リーン雰囲気でＮＯｘを十分に浄化すること
のできる、いわゆるリーンＮＯｘ触媒が研究されており
、Ｃｕ等の遷移金属、或いは、貴金属をゼオライトにイ
オン交換担持した金属−ゼオライド触媒が、リーンＮＯ
ｘ触媒として提案されている。For this reason, so-called lean NOx catalysts that can sufficiently purify NOx in a lean atmosphere are being researched, and metal-zeolide catalysts, in which transition metals such as Cu or precious metals are ion-exchanged supported on zeolite, are being used to purify lean NOx.
It has been proposed as an x catalyst.
例えば、本出願人は、特開平１−１３０７３５号公報に
おいて、遷移金属でイオン交換したゼオライトからなる
触媒材料を、耐火性担体上に担持させたリーンＮＯｘ触
媒を用いた触媒式排ガス浄化装置を提案した。この遷移
金属としては、Ｃｕ、 Ｃｏ、 Ｃｒ、Ｎ１％ Ｆｅ、
’Ａｇｓ Ｍｎが好ましく、特にＣｕが好ましい。For example, in Japanese Patent Application Laid-Open No. 1-130735, the applicant proposed a catalytic exhaust gas purification device using a lean NOx catalyst in which a catalyst material made of zeolite ion-exchanged with a transition metal is supported on a refractory carrier. did. The transition metals include Cu, Co, Cr, N1% Fe,
'Ags Mn is preferred, and Cu is particularly preferred.
また、ゼオライトは３次元骨格の結晶構造を形成し、細
孔（スーパーケージ）を有する。そのスーパーケージ中
にはイオン交換により導入された遷移金属の活性サイト
が存在するため排ガス中のＦＩＣはスーパーケージに選
択的に吸着される。その吸着されたｌ（ＣがＮＯｘと反
応し、ＮＯｘを還元して除去する。Moreover, zeolite forms a three-dimensional skeleton crystal structure and has pores (supercages). Since active sites of transition metals introduced by ion exchange exist in the supercage, FIC in the exhaust gas is selectively adsorbed to the supercage. The adsorbed 1(C) reacts with NOx, reducing and removing NOx.
本出願人は、また、特開平１−１３５５４１号公報にお
いて、遷移金属に代えて貴金属でイオン交換したゼオラ
イトからなるリーンＮＯｘ触媒を用いた触媒式排ガス浄
化装置についても提案している。The present applicant has also proposed, in Japanese Patent Application Laid-Open No. 1-135541, a catalytic exhaust gas purification device using a lean NOx catalyst made of zeolite ion-exchanged with a noble metal instead of a transition metal.
ゼオライトには、下記第１表に示すようにスーパーケー
ジ径の異なる各種のものがある。Zeolites include various types with different supercage diameters, as shown in Table 1 below.
ところが、エンジンから排出されるＨＣ成分には、様々
な分子サイズが存在するため、スーパーケージ構造がも
たらすゼオライトの分子篩い効果によってＨＣ成分が選
択的に吸着される。従って単一のスーパーケージ構造の
みからなるリーンＮＯｘ触媒では、）ＩＣの吸着ひいて
はＮＯＸの還元、除去は不十分なものであった。However, since the HC components discharged from the engine have various molecular sizes, the HC components are selectively adsorbed by the molecular sieving effect of zeolite brought about by the supercage structure. Therefore, with a lean NOx catalyst consisting of only a single supercage structure, the adsorption of IC and the reduction and removal of NOx were insufficient.
そこで、本出願人は特願昭６３−２９２６６２号（未公
開）に於いて、ｗ４（Ｃｕ）でイオン交換したゼオライ
トを用いたリーンＮＯｘ触媒について、スーパーケージ
径サイズの異なる２種以上のリーンＮＯｘ触媒を使用し
てエンジンから排出される様々な分子サイズのＨＣ成分
の吸着を可能にし、ＮＯｘの浄化率を向上させた触媒式
排ガス浄化装置を提案している。Therefore, in Japanese Patent Application No. 63-292662 (unpublished), the present applicant has proposed a lean NOx catalyst using zeolite ion-exchanged with w4 (Cu), which has two or more types of lean NOx catalysts with different supercage diameters. We are proposing a catalytic exhaust gas purification device that uses a catalyst to adsorb HC components of various molecular sizes discharged from an engine and improves the NOx purification rate.
［発明が解決しようとする課Ｂ］
しかしながら、特願昭６３−２９２６６２号では、ＨＣ
がＮＯｘと反応するに至るまでに触媒中で完全酸化を生
ずる点が考慮されていないため、特に分子の大きさが小
さなＨＣが、ＮＯｘの浄化に有効な状態（部分酸化して
活性種となった状態）での吸着効率が十分でなく、ＮＯ
ｘ浄化率を低下させる場合がある。即ち、排ガス浄化用
触媒装置中においてはリーンＮＯｘ触媒の酸化作用によ
り下流側程高温になるため、分子の小さなＨＣ程、特に
下流側の高温状態において、酸化されやすい性質があり
、完全酸化されたＨＣはＮＯｘの浄化に関与せず、ＩＣ
の完全酸化はＮＯｘの浄化率を低下させる。[Problem B to be solved by the invention] However, in Japanese Patent Application No. 63-292662, HC
This does not take into account that HC is completely oxidized in the catalyst before it reacts with NOx, so HC, which has a particularly small molecular size, is in a state that is effective for purifying NOx (partially oxidized and becomes active species). adsorption efficiency is not sufficient under
x It may reduce the purification rate. In other words, in the exhaust gas purification catalyst device, the temperature becomes higher downstream due to the oxidizing action of the lean NOx catalyst, so HC with smaller molecules is more likely to be oxidized, especially in the high temperature state on the downstream side, and is not fully oxidized. HC does not participate in NOx purification, IC
Complete oxidation of NOx reduces the NOx purification rate.
そこで、本発明は、酸化されやすい分子の小さなＨＣを
、触媒中の排ガスの流れ方向の上流側で比較的低温状態
においてリーンＮＯｘ触媒に吸着させて、ＮＯｘを浄化
させる。このようにして、分子の小さな）ｌＣの完全酸
化を抑制し、ＮＯｘの浄化率を向上させることを目的と
する。Therefore, the present invention purifies NOx by adsorbing HC, which has small molecules that are easily oxidized, on a lean NOx catalyst at a relatively low temperature on the upstream side of the catalyst in the flow direction of exhaust gas. In this way, the purpose is to suppress the complete oxidation of 1C, which is a small molecule, and to improve the NOx purification rate.
上記目的を達成するために、本発明は、遷移金属、或い
は、貴金属でイオン交換した酸素過剰雰囲気での還元触
媒材料を、耐火性担体上に担持した触媒式排ガス浄化装
置において、スーパーケージ径が異なる２種以上の、３
次元骨格の結晶構造を有する触媒材料からなり、スーパ
ーケージ径が小さな触媒材料の分布が触媒装置中の排ガ
スの流れ方間の上流側で多くなるように構成する。In order to achieve the above object, the present invention provides a catalytic exhaust gas purification device in which a reducing catalyst material in an oxygen-rich atmosphere is ion-exchanged with a transition metal or a noble metal and supported on a refractory carrier. 2 or more different types, 3
The catalytic converter is made of a catalytic material having a dimensional skeleton crystal structure, and the catalytic material has a small supercage diameter, and is configured so that the distribution of the catalytic material is increased on the upstream side of the flow direction of the exhaust gas in the catalytic device.
上記の如く構成された、触媒式排ガス浄化装置では、分
子の小さなＩ（Ｃを効率よく吸着するス−バーケージ径
の小さなリーンＮＯＸ触媒が、触媒装置中の排ガスの流
れ方向の上流側に多く分布するため、分子の小さなＨＣ
は、上流側で触媒に吸着されてＮＯｘの浄化に利用され
る。このため、酸化されやすい分子の小さなＨＣの完全
酸化が抑制され、ＮＯＸの浄化率を向上させる。In the catalytic exhaust gas purification device configured as described above, the lean NOx catalyst with a small super cage diameter that efficiently adsorbs small I (C) molecules is distributed in large numbers on the upstream side of the exhaust gas flow direction in the catalytic device. Therefore, HC with small molecules
is adsorbed by the catalyst on the upstream side and used to purify NOx. Therefore, complete oxidation of HC, which is a small molecule that is easily oxidized, is suppressed, and the NOx purification rate is improved.
［実施例］ 以下、添付図面を参照して本発明の詳細な説明する。[Example] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
第１図は本発明の全体構成図であり、１はエンジン、２
は排ガス浄化装置である。排ガス浄化装置２は３つのリ
ーンＮＯｘ触媒からなり、排ガスの流れ方向の上流側か
ら触媒Ａ、触媒Ｂ、触媒Ｃである。エンジン１で燃焼し
た混合気の排ガスは、エギゾーストマニホルド３、エギ
ゾーストバイブ４を経て排ガス浄化装置２に入る。排ガ
スは排ガス浄化装置２にて有害成分が浄化され、排気管
５、マフラ（図示せず）を経て大気に放出される。FIG. 1 is an overall configuration diagram of the present invention, where 1 is an engine, 2
is an exhaust gas purification device. The exhaust gas purification device 2 consists of three lean NOx catalysts, which are catalyst A, catalyst B, and catalyst C from the upstream side in the flow direction of exhaust gas. Exhaust gas from the mixture combusted by the engine 1 enters the exhaust gas purification device 2 via an exhaust manifold 3 and an exhaust vibe 4. The exhaust gas is purified of harmful components by an exhaust gas purification device 2, and is released into the atmosphere through an exhaust pipe 5 and a muffler (not shown).
排ガス浄化装置２は、第２図の斜視図において示すよう
に、コーディエライト類の正方形断面のハニカムを有す
るモノリス担体に後述する組成の触媒材料をコーティン
グした３種類のリーンＮＯｘ触媒Ａ、、Ｂ、Ｃを、位相
が一致するように結合して一体化したものである。As shown in the perspective view of FIG. 2, the exhaust gas purification device 2 includes three types of lean NOx catalysts A, B, which are coated with a catalyst material having the composition described below on a monolith support having a honeycomb of square cross section made of cordierite. , C are combined and integrated so that their phases match.
リーンＮＯｘ触媒Ａ、Ｂ、Ｃは、排ガスの流れ方向の上
流側へスーパーケージ径の小さいものを配置し、下流側
へ順番にスーパーケージ径が大きなものを配置している
。リーンＮＯｘ触媒Ａは第１表に示す２種の酸素環の連
結構造からなるスーパーケージを持つフェリエライトを
配置し、その下流側のリーンＮＯｘ触媒ＢにはリーンＮ
Ｏｘ触媒Ａよりもスーパーケージ径が大きな、第１表に
示すスーパーケージ構造を持つＺＳｌ’ｌ−５を配置し
、更に下流側のリーンＮＯｘ触媒ＣにはリーンＮＯｘ触
媒Ｂよりもスーパーケージ径が大きな、第１表に示すス
ーパーケージ構造を持つモルデナイトを配置した。Among the lean NOx catalysts A, B, and C, those with smaller super cage diameters are arranged on the upstream side in the flow direction of exhaust gas, and those with larger super cage diameters are arranged in order on the downstream side. Lean NOx catalyst A is equipped with ferrierite having a supercage consisting of a connected structure of two types of oxygen rings as shown in Table 1, and lean NOx catalyst B on the downstream side is equipped with lean NOx catalyst B.
ZSl'l-5, which has a supercage structure shown in Table 1 and has a larger supercage diameter than Ox catalyst A, is arranged, and the lean NOx catalyst C located further downstream has a supercage diameter larger than that of lean NOx catalyst B. A large piece of mordenite with the supercage structure shown in Table 1 was placed.
スーパーケージ構造は各材料によって異なるが、例えば
フェリエライトでは、第７図に示す様な連結構造をして
いる。スーパーケージは符号６で示される。Although the supercage structure differs depending on the material, for example, ferrierite has a connected structure as shown in FIG. 7. The supercage is designated by 6.
本実施例では、３種類のリーンＮＯＸ触媒Ａ、 ＢＣ
を一体とした排ガス浄化装置２を提案したが、第３図に
示す様に、モノリス担体にスーパーケージ径の異なるリ
ーンＮＯｘ触媒材料を各々担持させたリーンＮＯｘ触媒
ａ、ｂ、ｃを含む３つの排ガス浄化装置２１．２２．２
３を持つ構造としてもよい。なお、スーパーケージ径の
大きさは、リーンＮＯＸ触媒ａ、ｂ、ｃの順で太き（な
るように配置する。In this example, three types of lean NOx catalysts A and BC are used.
As shown in Fig. 3, we have proposed an exhaust gas purification device 2 that integrates three lean NOx catalysts a, b, and c, each of which has a monolithic carrier supporting lean NOx catalyst materials with different supercage diameters. Exhaust gas purification device 21.22.2
It is also possible to have a structure having 3. The super cage diameters are arranged so that the lean NOX catalysts a, b, and c become thicker in this order.
本実施例では、３種類のリーンＮＯｘ触媒を用いた例を
示したが、スーパーケージ径の異なるリーンＮＯｘ触媒
を２つ、或いは、４つ以上としてもよい。In this embodiment, an example is shown in which three types of lean NOx catalysts are used, but two, four or more lean NOx catalysts having different super cage diameters may be used.
また、本実施例ではモノリス担体の例で示したが、ベレ
ット状のものにおいても本発明は有効である。In addition, although the monolith carrier was used as an example in this example, the present invention is also effective in a pellet-shaped carrier.
；比較例１乙
本実施例で使用した、スーパーケージ径が小さなリーン
ＮＯｘ触媒Ａを、３つ並べた排ガス浄化装置。Comparative Example 1 B: An exhaust gas purification device in which three Lean NOx Catalysts A with small super cage diameters used in this example are arranged.
１比較例２゜
本実施例で使用した、スーパーケージ径が大きなリーン
ＮＯｘ触媒Ｃを、３つ並べた排ガス浄化装置。1 Comparative Example 2゜Exhaust gas purification device in which three Lean NOx Catalysts C with large super cage diameters used in this example are arranged.
［性能評価試験］
本実施例と比較例１及び比較例２の排ガス浄化装置につ
いて、下記条件でＨＣとＮＯＸの浄化率を測定した。な
お、空燃比（Ａ／Ｆ ）は２５である。[Performance Evaluation Test] The purification rates of HC and NOX were measured for the exhaust gas purification devices of this example, comparative examples 1 and 2 under the following conditions. Note that the air-fuel ratio (A/F) was 25.
試験条件
・エンジン：ディーゼルエンジン（３６６０ｃｃ）、１
２００ｒ、ｐ、ｍ、 −１５ｋｇｍ。Test conditions/Engine: Diesel engine (3660cc), 1
200r, p, m, -15kgm.
′ＡＣ： ５０００ｐｐ儀 （炭素原子換算）を基本に
した。'AC: Based on 5000pp (carbon atom equivalent).
・触 媒 ：４００セル／インチのモノリス担体に各触
媒材料をコートして、排ガ
スの流れ方向の上流側より触媒Ａ、
触媒Ｂ、触媒Ｃの３つのリーン
ＮＯｘ触媒からなる。・Catalyst: A monolithic carrier of 400 cells/inch is coated with each catalyst material, and consists of three lean NOx catalysts: catalyst A, catalyst B, and catalyst C from the upstream side in the flow direction of exhaust gas.
・分 析 ：ＨＣ・・・ＭＥＸＡ−１１２０ＴＦＩ−Ｆ
。・Analysis: HC...MEXA-1120TFI-F
.
ＮＯｘ−ＭＥＸＡ−８１２０、 （共に、堀場製作所製の分析器）。NOx-MEXA-8120, (Both analyzers manufactured by Horiba).
試験結果を第４図、第５図、第６図に示す。The test results are shown in FIGS. 4, 5, and 6.
これらの図に示すように、ＨＣの吸着率とｌ（Ｃの浄化
率に相関があると考えられる。As shown in these figures, it is thought that there is a correlation between the HC adsorption rate and the l(C purification rate).
第４図は、本実施例の評価試験結果を示す。各リーンＮ
ＯＸ触媒Ａ、Ｂ、Ｃてスーパーケージ径に合った分子サ
イズのＨＣが吸着され、ＩＩｃの浄化率（吸着率）は触
媒長さに対して上昇する。その結果、ＮＯｘの浄化率も
、触媒長さに対して上昇する。つまり、排ガス中の）Ｉ
Ｃが高効率で吸着されるため、ＨＣの浄化率が向上し、
これにともなってＮＯｘの浄化率も向上する。つまり、
ＨＣ、ＮＯｘともに浄化率が高い。FIG. 4 shows the evaluation test results of this example. Each lean N
OX catalysts A, B, and C adsorb HC with a molecular size that matches the supercage diameter, and the purification rate (adsorption rate) of IIc increases with the catalyst length. As a result, the NOx purification rate also increases with respect to the catalyst length. In other words, I in the exhaust gas
Since C is adsorbed with high efficiency, the purification rate of HC is improved,
Along with this, the NOx purification rate also improves. In other words,
Both HC and NOx purification rates are high.
第５図は、比較例１の試験結果を示す。本実施例で使用
した、スーパーケージ径が小さなリーンＮＯｘ触媒Ａを
３つ並べており、中央及び下流側では触媒中の温度が下
流側程高くなるため、吸着し得る分子サイズの小さなＨ
Ｃは、酸化されてＮＯｘの浄化機能が低下し、ＮＯｘの
浄化率はあまり上昇しない。FIG. 5 shows the test results of Comparative Example 1. Three lean NOx catalysts A with small supercage diameters used in this example are lined up, and since the temperature inside the catalyst becomes higher in the center and downstream, the smaller the molecular size that can be adsorbed,
C is oxidized and its NOx purification function decreases, and the NOx purification rate does not increase much.
第６図は、比較例２の試験結果を示す。本実施例で使用
したスーパーケージ径が大きなリーンＮＯｘ触媒Ｃを３
つ並べており、主に吸着され得る分子サイズの大きなＨ
Ｃは酸化されにくいため、触媒長さに対してＮＯｘの浄
化率は、はぼ−様に上昇するが、第５図と比べると全体
としてＩＩＣ及びＮＯｘ浄化率は低い。FIG. 6 shows the test results of Comparative Example 2. The lean NOx catalyst C used in this example with a large super cage diameter was
The large H molecules that can be mainly adsorbed are
Since C is difficult to oxidize, the NOx purification rate rises in a roughly similar manner to the length of the catalyst, but the IIC and NOx purification rates are lower as a whole compared to FIG. 5.
［発明の効果］
以上説明したように、本発明によれば、分子の小さなＦ
ＩＣの完全酸化が抑えられ、ＮＯｘ浄化率が向上する。[Effects of the Invention] As explained above, according to the present invention, the small molecular F
Complete oxidation of the IC is suppressed and the NOx purification rate is improved.
また、スーパーケージ径の異なる２種以上のリーンＮＯ
ｘ触媒としていることにより、各種分子サイズの）ＩＣ
を効率よく吸着してリーンＮＯＸ触媒として利用でき、
ＮＯｘの浄化率の高い触媒式排ガス浄化装置を提供でき
る。In addition, two or more types of Lean NO with different super cage diameters
By using x catalyst, IC of various molecular sizes can be produced.
can be efficiently adsorbed and used as a lean NOx catalyst.
A catalytic exhaust gas purification device with a high NOx purification rate can be provided.
第１図は、本発明による実施例の排ガス浄化装置を備え
たエンジンの全体構成図、
第２図は、本発明による実施例の排ガス浄化装置の斜視
図、
第３図は、他の実施例の排ガス浄化装置の構成図、
第４図は、本実施例のＨＣとＮＯＸの浄化率性能試験結
果を表す図、
第５図は、比較例１の浄化率性能試験結果を表す図、
第６図は、比較例２の浄化率性能評価結果を表す図、
第７図は、フェリエライトの結晶構造を表す図、を示す
ものである。
符号の説明
１・・・・・・エンジン
２・・・・・・排ガス浄化装置
Ａ・・・・・・リーンＮＯｘ触媒Ａ
Ｂ・・・・・・リーンＮＯｘ触媒Ｂ
Ｃ・・・・・・リーンＮＯＸ触媒Ｃ
６・・・・・・スーパーケージ
出願人 トヨタ自動車株式会社
第２図
第３図
６スーパーブーレ′Fig. 1 is an overall configuration diagram of an engine equipped with an exhaust gas purification device according to an embodiment of the present invention, Fig. 2 is a perspective view of an exhaust gas purification device according to an embodiment of the present invention, and Fig. 3 is another embodiment. Fig. 4 is a diagram showing the results of the HC and NOX purification efficiency test of this example; Fig. 5 is a diagram showing the results of the purification efficiency test of Comparative Example 1; The figure shows the purification rate performance evaluation results of Comparative Example 2, and FIG. 7 shows the crystal structure of ferrierite. Explanation of symbols 1... Engine 2... Exhaust gas purification device A... Lean NOx catalyst A B... Lean NOx catalyst B C... Lean NOX Catalyst C 6... Super Cage Applicant Toyota Motor Corporation Figure 2 Figure 3 6 Super Bure'
Claims (1)
囲気での還元触媒材料を、耐火性担体上に担持した内燃
機関の触媒式排ガス浄化装置において、 前記触媒材料は、スーパーケージ径が異なる２種以上の
、３次元骨格の結晶構造を有する触媒材料からなり、 スーパーケージ径が小さな触媒材料の分布を、前記浄化
装置中の排ガスの流れ方向の上流側に、多くしたことを
特徴とする内燃機関の触媒式排ガス浄化装置。[Scope of Claim] A catalytic exhaust gas purification device for an internal combustion engine, in which a catalyst material for reduction in an oxygen-rich atmosphere, which has been ion-exchanged with a transition metal or a noble metal, is supported on a refractory carrier, wherein the catalyst material is a super cage. The catalyst material is composed of two or more types of catalyst materials having three-dimensional skeleton crystal structures with different diameters, and the catalyst material having a small super cage diameter is distributed more on the upstream side in the flow direction of the exhaust gas in the purification device. Features: Catalytic exhaust gas purification device for internal combustion engines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2129850A JP2751562B2 (en) | 1990-05-18 | 1990-05-18 | Catalytic exhaust gas purification system for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2129850A JP2751562B2 (en) | 1990-05-18 | 1990-05-18 | Catalytic exhaust gas purification system for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0427706A true JPH0427706A (en) | 1992-01-30 |
| JP2751562B2 JP2751562B2 (en) | 1998-05-18 |
Family
ID=15019795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2129850A Expired - Fee Related JP2751562B2 (en) | 1990-05-18 | 1990-05-18 | Catalytic exhaust gas purification system for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2751562B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5544387A (en) * | 1993-04-15 | 1996-08-13 | Yoshida Kogyo K.K. | Curtain attachment connector assembly and curtain attachment connector |
| JP2002190739A (en) * | 2000-12-22 | 2002-07-05 | Kawasaki Microelectronics Kk | Semiconductor device |
| JP2011125846A (en) * | 2009-11-19 | 2011-06-30 | Ibiden Co Ltd | Honeycomb structure and apparatus for cleaning exhaust gas |
| JPWO2013141221A1 (en) * | 2012-03-19 | 2015-08-03 | 富士電機株式会社 | Manufacturing method of semiconductor device |
-
1990
- 1990-05-18 JP JP2129850A patent/JP2751562B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5544387A (en) * | 1993-04-15 | 1996-08-13 | Yoshida Kogyo K.K. | Curtain attachment connector assembly and curtain attachment connector |
| JP2002190739A (en) * | 2000-12-22 | 2002-07-05 | Kawasaki Microelectronics Kk | Semiconductor device |
| JP4500439B2 (en) * | 2000-12-22 | 2010-07-14 | 川崎マイクロエレクトロニクス株式会社 | Semiconductor device |
| JP2011125846A (en) * | 2009-11-19 | 2011-06-30 | Ibiden Co Ltd | Honeycomb structure and apparatus for cleaning exhaust gas |
| JPWO2013141221A1 (en) * | 2012-03-19 | 2015-08-03 | 富士電機株式会社 | Manufacturing method of semiconductor device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2751562B2 (en) | 1998-05-18 |
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