JPH062228B2 - Exhaust gas purification catalyst support - Google Patents
Exhaust gas purification catalyst supportInfo
- Publication number
- JPH062228B2 JPH062228B2 JP61053973A JP5397386A JPH062228B2 JP H062228 B2 JPH062228 B2 JP H062228B2 JP 61053973 A JP61053973 A JP 61053973A JP 5397386 A JP5397386 A JP 5397386A JP H062228 B2 JPH062228 B2 JP H062228B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- exhaust gas
- ceramic layer
- ceramic
- metal matrix
- 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.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2807—Metal other than sintered metal
- F01N3/281—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、自動車の排気ガス中に含まれるCO、HC及びNO
x等の有害ガスを酸化、還元及び分解させるための排気
ガス浄化用触媒の担持体に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to CO, HC and NO contained in exhaust gas of an automobile.
The present invention relates to a carrier for an exhaust gas purification catalyst for oxidizing, reducing and decomposing harmful gases such as x.
従来、この種の触媒担持体としては、主にコージユライ
ト等のセラミックスをハニカム状に構成したモノリス担
持体に、アルミナによるスラリーを被着、乾燥せしめ、
その後、焼成したものが使用され、該担持体に白金、パ
ラジウム或いはロジウム等の貴金属からなる触媒物質を
担持させていた。Conventionally, as a catalyst carrier of this kind, a monolith carrier mainly composed of a ceramic such as cordierite in a honeycomb shape is coated with a slurry of alumina and dried,
Then, a calcined product was used, and a catalyst substance made of a noble metal such as platinum, palladium or rhodium was carried on the carrier.
触媒自体は、機関近くの高い排気温度域で使用できれ
ば、反応速度を早めて浄化効率を良好とし、全体の容量
を小型、コンパクトとすることができるものである。し
かしながら、従来の前記セラミツクスを芯体として構成
したものにあつては、低い熱伝導のために高温度域では
使用すると、触媒自体の反応熱も加わり、蓄熱作用によ
つて担持体が自溶して形状がくずれ、従つて触媒反応が
十分に発揮できず、耐久性に乏ぼしい等の問題を有する
ものであつた。If the catalyst itself can be used in a high exhaust temperature range near the engine, the reaction rate can be accelerated to improve the purification efficiency, and the overall capacity can be made small and compact. However, in the case where the above-mentioned conventional ceramic is used as a core body, when it is used in a high temperature range due to low heat conduction, the reaction heat of the catalyst itself is added, and the carrier self-dissolves by the heat storage effect. Therefore, the shape is deteriorated, and accordingly, the catalytic reaction cannot be sufficiently exhibited, and the durability is poor.
また、耐熱性の金属材の波板、或いは金網を積層状にし
て構成した触媒担持体にあつては、熱伝導が良好であ
り、高温度域での使用が可能であり、薄板状による担持
面積の増大、優れた耐熱衝撃性を有することができる反
面、金属材からなる担持体は、その金属肌表面が疎水性
であるため、該担持体に触媒物質を強固に、且つ均一に
分布担持させることが極めて困難であり、そのためアル
ミナのコーテイングを施し、このコーテイング層に触媒
物質を担持させていたが、金属母体との接着強度を強固
となし得ず、またアルミナ・コーテイング層全体が多孔
性であるため排気ガスにより金属母体に腐蝕を生じる等
の問題を有するものであつた。In addition, a corrugated sheet of heat-resistant metal or a catalyst carrier composed of laminated metal nets has good thermal conductivity and can be used in a high temperature range. While the surface area can be increased and the thermal shock resistance can be excellent, since the metal skin surface of the carrier made of a metal material is hydrophobic, the catalyst substance is strongly and uniformly distributed and supported on the carrier. It was extremely difficult to make it so that the coating of alumina was applied and the catalytic substance was supported on this coating layer, but the adhesive strength with the metal matrix could not be strong and the entire alumina coating layer was porous. Therefore, there is a problem that the exhaust gas causes corrosion of the metal matrix.
本発明は上記した従来の問題を極めて効果的に解決する
ため、耐熱性からなる板状金属母体の表面に設けた強固
に密着してなる緻密なセラミツク層の層上に、更に表面
を多孔性の同系のセラミツク層を被着結合して構成せし
めることにより、高温度域での使用に十分に対処でき、
耐久性に優れ、且つ触媒物質の均一な分布担持を容易と
して触媒反応の十分に発揮できる排気ガス浄化用触媒担
持体を提案することを目的とするものである。In order to solve the above-mentioned conventional problems very effectively, the present invention is provided on the surface of a heat-resistant plate-shaped metal matrix, on a layer of a dense ceramic layer firmly adhered to the surface of the plate-shaped metal matrix. By constructing by bonding and bonding the ceramic layers of the same type of, it is possible to sufficiently cope with use in a high temperature range,
It is an object of the present invention to provide an exhaust gas purifying catalyst carrier which is excellent in durability and can easily carry a uniform distribution of a catalytic substance to sufficiently exert a catalytic reaction.
本発明は、耐熱性金属からなる板状金属母体の表面に、
下層として気孔率１５％以下の酸化クロム、Ａｌ２Ｏ３
及びＳｉＯ２からなるセラミック層を有し、該層上に、
気孔率２０乃至３０％の前記セラミック層と同系のセラ
ミック層を上層として被着結合して構成した排気ガス浄
化用触媒担持体を要旨とするものである。The present invention, on the surface of the plate-shaped metal matrix made of heat-resistant metal,
As a lower layer, chromium oxide having a porosity of 15% or less, Al 2 O 3
And a ceramic layer composed of SiO 2, and on the layer,
The gist of the present invention is an exhaust gas purifying catalyst carrier which is formed by adhering and bonding an upper layer of a ceramic layer similar to the ceramic layer having a porosity of 20 to 30%.
以下、本発明の実施例を図面に基づいて説明すれば、第
１図は本発明の排気ガス浄化用触媒担持体の拡大による
一部断面図であつて、(1)は例えばSUS 302B、SUS 304、
及びSUS 410L等のステンレス鋼の耐熱性金属からなる板
状金属母体であり、該金属母体の平板と波板とを重ね巻
きしてハニカム状に加工構成してなるものである。な
お、金属母体(1)の肌表面は後述する下層としての酸化
クロム系セラミツク層との化学結合を良好にするため、
予めエツチング等により粗面化処理を施しておくことが
望ましい。(2)は金属母体(1)の表面に下層として設けた
緻密な酸化クロム系セラミツク層である。即ちCrO3等の
水溶性クロム酸化物の濃水溶液にAl2O3及びSiO2のセラ
ミツクス微粉末を加えて混成したスラリー中に、前記金
属母体(1)を浸漬して表面に該スラリーを付着せしめ、
乾燥後に加熱処理（500℃乃至600℃で60分乃至180分）
を行うことにより、Cr2O3、Al2O3及びSiO2からなる多孔
性のセラミツク被膜を形成する。次いで比重1.6乃至1.7
5からなるクロム酸の濃水溶液を該セラミツク被膜に含
浸させ、乾燥及び加熱処理（500℃乃至600℃の温度で40
分乃至60分）し、この含浸→乾燥→加熱処理を少なくと
も５回反復燥返し行うことにより、Cr2O3が金属肌及び
多孔性のセラミツク被膜の粒子相互間に化学結合して緻
密な酸化クロム系セラミツク層を形成するものであり、
このセラミツク層は前記した処理により気孔率１５％以
下とすることができる。(3)は前記緻密な酸化クロム系
セラミツク層(2)の層上に、上層として被着結合した比
較的多孔性からなる前記同系のセラミツク層である。即
ち緻密な酸化クロム系セラミツク層(2)の表面に、水溶
性クロム酸化物の濃水溶液にAl2O3及びSiO2のセラミツ
クス粉末を加えて混成したスラリー中に浸漬して該スラ
リーを塗着し、乾燥後に加熱処理を行い、更にクロム酸
の濃水溶液を含浸させて乾燥及び加熱処理を行い、この
含浸→乾燥→加熱処理を多くとも３回繰返し行うことに
より、好ましくは気孔率20％乃至30％の比較的多孔性の
セラミツク層を化学結合して被着するのである。Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view of an enlarged exhaust gas purifying catalyst carrier of the present invention, in which (1) is, for example, SUS 302B, SUS. 304,
And a plate-shaped metal matrix made of a heat-resistant metal such as SUS 410L of stainless steel, in which a flat plate and a corrugated plate of the metal matrix are overlapped and processed into a honeycomb shape. Incidentally, the skin surface of the metal matrix (1) in order to improve the chemical bond with the chromium oxide-based ceramic layer as the lower layer described later,
It is desirable to apply a roughening treatment in advance by etching or the like. (2) is a dense chromium oxide-based ceramic layer provided as a lower layer on the surface of the metal matrix (1). That is, in a slurry obtained by adding fine ceramic powders of Al 2 O 3 and SiO 2 to a concentrated aqueous solution of a water-soluble chromium oxide such as CrO 3 , the metal matrix (1) is dipped to adhere the slurry to the surface. Sir,
Heat treatment after drying (500 to 600 ℃ for 60 to 180 minutes)
By performing the above, a porous ceramic coating made of Cr 2 O 3 , Al 2 O 3 and SiO 2 is formed. Then specific gravity 1.6 to 1.7
The ceramic coating is impregnated with a concentrated aqueous solution of chromic acid consisting of 5 and dried and heat-treated (at a temperature of 500 ° C to 600 ° C, 40
By repeating this impregnation → drying → heat treatment at least 5 times repeatedly, Cr 2 O 3 is chemically bonded between the particles of the metal skin and the particles of the porous ceramic coating to form a dense oxidation. It forms a chromium-based ceramic layer,
The ceramic layer can be made to have a porosity of 15% or less by the above-mentioned treatment. (3) is the same type of ceramic layer which is relatively porous and is adhered and bonded as an upper layer on the layer of the dense chromium oxide type ceramic layer (2). That is, the surface of the dense chromium oxide-based ceramic layer (2) is dipped in a slurry prepared by adding Al 2 O 3 and SiO 2 ceramic powder to a concentrated aqueous solution of water-soluble chromium oxide, and coating the slurry. Then, heat treatment is performed after drying, further impregnation with a concentrated aqueous solution of chromic acid is performed, and drying and heat treatment are performed, and this impregnation → drying → heat treatment is repeated at most three times, preferably with porosity of 20% to 30% of the relatively porous ceramic layer is chemically bonded and deposited.
本発明は、このように耐熱性金属からなる金属を担持体
の母体としてその表面に、Al2O3とSiO2の耐熱酸化物をC
r2O3により化学結合せしめて強固に密着した緻密なセラ
ミツク層(2)を設けたもので、該セラミツク層(2)により
金属母体の腐蝕を防止し振動及び高温度域での使用に十
分に耐久性を発揮することとなり、且つ上層としての多
孔性からなる同系セラミツク層(3)の多孔表面状態によ
つて、触媒物質を均一且つ容易に含浸せしめて担持させ
ることとなるものである。In the present invention, the heat-resistant oxide of Al 2 O 3 and SiO 2 is C
A dense ceramic layer (2) is provided that is chemically bonded by r 2 O 3 and firmly adheres to it, and the ceramic layer (2) prevents corrosion of the metal matrix and is sufficient for use in vibration and high temperature regions. In addition, the catalytic substance is uniformly and easily impregnated and supported by the porous surface state of the porous ceramic layer (3) having a high porosity as the upper layer.
以上説明したように、本発明による触媒担持体は、下層
としての前記緻密なセラミツク層(2)と上層の多孔性か
らなる同系のセラミツク層(3)との二層構造により、金
属母体の腐蝕を防止し、且つ振動及び高温度域での耐熱
性及び触媒物質の均一な分布担持を容易とすることは勿
論のこと、金属母体(1)をハニカム状に加工、構成する
ことにより、触媒の担持面積を著しく拡大することがで
き、従つて全体の容積を小型、コンパクトとし、触媒性
能の活性化並びに効率化することができ、極めて有用な
排気ガス浄化触媒担持体である。As explained above, the catalyst carrier according to the present invention has a two-layer structure of the dense ceramic layer (2) as the lower layer and the similar ceramic layer (3) consisting of the upper layer of the porous layer, which causes corrosion of the metal matrix. Of course, and, of course, it is easy to support the heat resistance in a vibration and high temperature range and the uniform distribution of the catalyst substance, and by processing and configuring the metal matrix (1) into a honeycomb shape, the catalyst It is a very useful exhaust gas purifying catalyst carrier, which can remarkably expand the supporting area, and accordingly make the entire volume small and compact, and activate and improve the catalytic performance.
第１図は本発明の一実施例を示す排気ガス浄化用触媒担
持体の拡大による一部断面図である。 (1)…金属母体、(2)…緻密な酸化クロム系セラミツク
層、(3)…多孔性の同系セラミツク層FIG. 1 is a partial cross-sectional view of an enlarged exhaust gas purifying catalyst carrier showing an embodiment of the present invention. (1) ... Metal matrix, (2) ... Dense chrome oxide ceramic layer, (3) ... Porous similar ceramic layer
Claims (1)
面に、下層として気孔率１５％以下の酸化クロム、Ａｌ
２Ｏ３及びＳｉＯ２からなるセラミック層(2)を有し、
該層上に、気孔率２０乃至３０％の前記セラミック層
(2)と同系のセラミック層(3)を上層として被着結合して
構成したことを特徴とする排気ガス浄化用触媒担持体。1. A chromium oxide, Al having a porosity of 15% or less as an underlayer on the surface of a plate-shaped metal matrix (1) made of a heat-resistant metal.
Having a ceramic layer (2) composed of 2 O 3 and SiO 2 ,
The ceramic layer having a porosity of 20 to 30% on the layer
An exhaust gas purifying catalyst carrier comprising an upper layer of a ceramic layer (3) of the same system as (2) as an upper layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61053973A JPH062228B2 (en) | 1986-03-12 | 1986-03-12 | Exhaust gas purification catalyst support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61053973A JPH062228B2 (en) | 1986-03-12 | 1986-03-12 | Exhaust gas purification catalyst support |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62213844A JPS62213844A (en) | 1987-09-19 |
| JPH062228B2 true JPH062228B2 (en) | 1994-01-12 |
Family
ID=12957591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61053973A Expired - Fee Related JPH062228B2 (en) | 1986-03-12 | 1986-03-12 | Exhaust gas purification catalyst support |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH062228B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0287922U (en) * | 1988-12-27 | 1990-07-12 | ||
| ES2159712T3 (en) * | 1995-11-23 | 2001-10-16 | Scambia Ind Dev Ag | PROCEDURE FOR THE MANUFACTURE OF A CATALYST BODY FOR THE CATALYTIC TREATMENT OF GAS, CATALYST BODY AND CATALYST. |
| CN104014327B (en) * | 2014-05-28 | 2016-02-03 | 上海纳米技术及应用国家工程研究中心有限公司 | Chromium oxide cellular integrated Catalysts and its preparation method and application |
| CN121608471B (en) * | 2026-01-30 | 2026-04-24 | 成都大学 | High heat-resistant, heat-insulating, lightweight three-way catalytic converter shell material for passenger vehicles and its preparation method |
-
1986
- 1986-03-12 JP JP61053973A patent/JPH062228B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62213844A (en) | 1987-09-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0746411B1 (en) | Improved layered catalyst composition | |
| JP3309971B2 (en) | Manufacturing method of exhaust gas purifying catalyst | |
| GB2079174A (en) | Wound foil catalytic converter structure and method for manufacturing same | |
| CA1180165A (en) | Plate catalyst body for denitration | |
| EP0704241A1 (en) | Catalyst structure comprizing a cellular substrate and a layer of catalytically active material | |
| JP4924500B2 (en) | Exhaust gas purification catalyst body | |
| CN106955681A (en) | A kind of preparation method of integral catalyzer for purifying formaldehyde | |
| JPH062228B2 (en) | Exhaust gas purification catalyst support | |
| EP1723998B1 (en) | Filter catalyst | |
| JPH08299809A (en) | Method for preparing honeycomb-shaped catalyst | |
| JPH08150339A (en) | Exhaust gas purification catalyst and its production | |
| JPH02172538A (en) | Exhaust gas purification catalyst | |
| JP2020062627A (en) | Ammonia cleaning catalyst | |
| JP2851459B2 (en) | Metal-based catalyst and method for producing the same | |
| JPS6031828A (en) | Catalyst for purifying exhaust gas and its preparation | |
| JPH08238431A (en) | Honeycomb catalyst | |
| JPH0427440A (en) | Planar catalyst and manufacture thereof | |
| JPS60225652A (en) | Preparation of monolithic catalyst having catalyst non-supporting part | |
| JPH03193141A (en) | Preparation of self-heating type catalyst | |
| JPS6147575B2 (en) | ||
| JP2009045569A (en) | Porous support, method for producing the same, and catalyst body | |
| JPH02258069A (en) | Plate-shaped laminated catalyst | |
| JPH0352976Y2 (en) | ||
| JP2686993B2 (en) | Exhaust gas pretreatment agent | |
| JP5325079B2 (en) | Metal carrier catalyst for exhaust gas purification |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |