JP2788995B2 - Method for producing exhaust gas purifying catalyst - Google Patents
Method for producing exhaust gas purifying catalystInfo
- Publication number
- JP2788995B2 JP2788995B2 JP1097897A JP9789789A JP2788995B2 JP 2788995 B2 JP2788995 B2 JP 2788995B2 JP 1097897 A JP1097897 A JP 1097897A JP 9789789 A JP9789789 A JP 9789789A JP 2788995 B2 JP2788995 B2 JP 2788995B2
- Authority
- JP
- Japan
- Prior art keywords
- honeycomb body
- flat plate
- exhaust gas
- brazing
- outer cylinder
- 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 - Lifetime
Links
- 239000003054 catalyst Substances 0.000 title claims description 31
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 27
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 238000005219 brazing Methods 0.000 description 26
- 239000007789 gas Substances 0.000 description 24
- 230000000052 comparative effect Effects 0.000 description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 238000005304 joining Methods 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- SONJTKJMTWTJCT-UHFFFAOYSA-K rhodium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Rh+3] SONJTKJMTWTJCT-UHFFFAOYSA-K 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
-
- 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
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2842—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration specially adapted for monolithic supports, e.g. of honeycomb type
-
- 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
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/02—Metallic plates or honeycombs, e.g. superposed or rolled-up corrugated or otherwise deformed sheet metal
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)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は排気ガス浄化用触媒の製造方法に関するもの
である。Description: TECHNICAL FIELD The present invention relates to a method for producing an exhaust gas purifying catalyst.
（従来の技術） 排気ガス浄化用触媒の担体として、メタル担体はセラ
ミックス担体に比べて昇温特性や耐衝撃性に優れている
等の利点を有するので、近年、例えば車両用の排気ガス
浄化用触媒の担体として使用されている。メタル担体は
通常ハニカム体を外筒に収納した構造を有し、前記ハニ
カム体としては、例えば、平板と波板とを交互に重ね合
わせてなるもの、平板と波板とを重ね合わせて渦巻状に
巻き上げてなるもの等がある。(Prior Art) As a carrier of an exhaust gas purifying catalyst, a metal carrier has advantages such as superior temperature-rise characteristics and impact resistance as compared with a ceramic carrier. Used as a catalyst carrier. The metal carrier usually has a structure in which a honeycomb body is housed in an outer cylinder. Examples of the honeycomb body include a flat body and a corrugated sheet which are alternately stacked, and a flat sheet and a corrugated sheet which are spirally stacked. And the like.
そのようなメタル担体として、例えば、特開昭56−43
73号公報、特公昭47−48109号公報、特公昭55−32424号
公報には、ハニカム体と外筒とをその接触部の周方向及
び軸方向で全体的に接合したメタル担体が開示されてお
り、また、例えば実開昭62−194436号公報には、ハニカ
ム体と外筒とをその接触部の周方向で全体的、また軸方
向で部分的に、例えば端面部においてのみ接合したメタ
ル担体が開示されている。As such a metal carrier, for example, JP-A-56-43
No. 73, Japanese Patent Publication No. 47-48109, and Japanese Patent Publication No. 55-32424 disclose a metal carrier in which a honeycomb body and an outer cylinder are entirely joined in a circumferential direction and an axial direction of a contact portion thereof. In addition, for example, Japanese Utility Model Application Laid-Open No. Sho 62-194436 discloses a metal carrier in which a honeycomb body and an outer cylinder are joined entirely in a circumferential direction of a contact portion thereof and partially in an axial direction, for example, only at an end face portion. Is disclosed.
（発明が解決しようとする課題） しかしながら、メタル担体はセラミックス担体に比べ
膨張係数が大きいため、それを使用した排気ガス浄化用
触媒において排気ガスの流速の速い中央部と外周部との
間に温度差を生じるとハニカム体と外筒との接合部に応
力を生じ、ハニカム体が破断することがある。また、ハ
ニカム体と外筒との材質が異なるときには膨張係数に差
があるため、やはりハニカム体が破断することがある。
特に自動車の排気ガス浄化用触媒にメタル担体を使用し
た場合には冷熱耐久試験でハニカム部に破断を生じ易
い。さらに、ハニカム体と外筒とのろう付け部分に亀裂
が生じると、ハニカム体が外筒から剥離し、剥離したハ
ニカム体がエンジンの背圧等により外筒からずれるとい
う現象が生じ易い。外筒の両端には管径を絞ったコーン
部が溶接されているため、ずれたハニカム体がコーン部
に押しつけられるとハニカム体の端部外周が座屈し、そ
の部分の排気ガス通過が妨げられるため、触媒としての
性能を低下させるという点で問題となっていた。(Problems to be Solved by the Invention) However, since the metal carrier has a larger expansion coefficient than the ceramic carrier, in a catalyst for purifying exhaust gas using the metal carrier, the temperature between the central portion and the outer peripheral portion where the flow rate of exhaust gas is high is high. If a difference is generated, a stress is generated at a joining portion between the honeycomb body and the outer cylinder, and the honeycomb body may be broken. Further, when the material of the honeycomb body and the material of the outer cylinder are different, there is a difference in expansion coefficient, so that the honeycomb body may be broken.
In particular, when a metal carrier is used as a catalyst for purifying an exhaust gas of an automobile, the honeycomb portion is liable to break in a cold / heat durability test. Further, when a crack is formed in a brazed portion between the honeycomb body and the outer cylinder, a phenomenon that the honeycomb body separates from the outer cylinder and the separated honeycomb body easily shifts from the outer cylinder due to engine back pressure or the like. A cone with a reduced diameter is welded to both ends of the outer cylinder, so if a displaced honeycomb body is pressed against the cone, the outer periphery of the end of the honeycomb body will buckle, preventing the passage of exhaust gas at that part Therefore, there has been a problem in that the performance as a catalyst is reduced.
前記従来技術におけるハニカム体と外筒とを接触部の
周方向及び軸方向で全体的に接合したメタル担体は、上
記の応力を緩和することができないため前記欠点を解消
することができない。また、実開昭62−194436号公報に
記載されたメタル担体においても、ハニカム体と外筒と
は周方向では全体的にろう付けされているため、やはり
前記欠点を解消することができない。The metal carrier of the prior art in which the honeycomb body and the outer cylinder are entirely joined in the circumferential direction and the axial direction of the contact portion cannot relieve the above-mentioned stress, so that the above-mentioned disadvantage cannot be solved. Also, in the metal carrier described in Japanese Utility Model Application Laid-Open No. Sho 62-194436, since the honeycomb body and the outer cylinder are entirely brazed in the circumferential direction, the above-described disadvantage cannot be solved.
本発明は前記の如き従来技術における問題点を解決す
るためになされたものであり、本発明の目的は、熱や振
動による応力を受けても、ハニカム部に破断が生じにく
く、ハニカム部と外筒とが剥離しにくく、耐久性及び耐
久後の触媒性能に優れた排気ガス浄化用触媒を製造しう
る方法を提供することにある。The present invention has been made in order to solve the problems in the prior art as described above, and an object of the present invention is to prevent the honeycomb portion from being easily broken even when subjected to stress due to heat or vibration, so that the honeycomb portion and the outer portion are hardly broken. An object of the present invention is to provide a method capable of manufacturing an exhaust gas purifying catalyst which is hardly peeled off from a cylinder and has excellent durability and catalytic performance after durability.
（課題を解決するための手段） 従って、本発明の排気ガス浄化用触媒の製造方法は、
平板と波板とを重ね合わせて、渦巻状に巻き上げ、平板
または波板のうち最外周を構成する方の板のみを最外周
部においてさらに0.5周以上巻くことにより、最外周部
で平板同士または波板同士を全外周の1/2以上重ね合わ
せ、該重ね合わせた最外周部の平板同士または波板同士
を部分的にろう付けしてハニカム体を形成し、該ハニカ
ム体を外筒に挿入してメタル担体を作成し、該メタル担
体に触媒を担持することを特徴とする。(Means for Solving the Problems) Accordingly, the method for producing an exhaust gas purifying catalyst of the present invention comprises:
The flat plate and the corrugated plate are superimposed and spirally wound up, and only the plate constituting the outermost periphery of the flat plate or the corrugated plate is further wound 0.5 times or more at the outermost peripheral portion, so that the flat plates or the flat plates at the outermost peripheral portion or The corrugated sheets are overlapped with each other by half or more of the entire outer periphery, and the flat plates or corrugated sheets on the outermost peripheral portion which are overlapped are partially brazed to form a honeycomb body, and the honeycomb body is inserted into the outer cylinder. In this manner, a metal carrier is prepared, and a catalyst is supported on the metal carrier.
ハニカム体の材料としては、Cr30重量％以下及びAl20
重量％以下を含み、残部が主にFeからなる高耐熱ステン
レス鋼を使用するのが好ましい。As the material of the honeycomb body, Cr30% by weight or less and Al20
It is preferable to use a high heat-resistant stainless steel containing less than 10% by weight, with the balance being mainly Fe.
さらに好ましくは、重量比で20重量％以下のAlをメッ
キするとか、クラッド、溶射等で表面をAl富化した高耐
熱ステンレス鋼薄板を使用する。More preferably, a highly heat-resistant stainless steel thin plate whose surface is enriched with Al by plating 20% by weight or less of Al by cladding, thermal spraying or the like is used.
ハニカム体の形成に使用される平板及び波板は、例え
ば上記高耐熱ステンレス鋼等の材料を、板状体、例えば
板厚10〜100μｍの板状体に圧延し、平板または波板に
加工することにより得られる。The flat plate and corrugated plate used for forming the honeycomb body are, for example, a material such as the above high heat-resistant stainless steel, which is rolled into a plate-shaped body, for example, a plate having a thickness of 10 to 100 μm, and processed into a flat plate or a corrugated plate. It can be obtained by:
最外周部の平板同士または波板同士のろう付けは、ろ
う付け部がメタル担体の軸方向もしくは周方向で部分的
に形成されるように、または軸方向及び周方向の両方で
部分的に形成されるように行われる。該ろう付け部の形
状は特に限定されないが、例えば直径１〜20mmの水玉
状、幅１〜20mmの格子状、幅１〜20mmのストライプ状等
とするとよい。ろう付けは、上記のろう付け部の形状の
パターン１種類で行っても、２種類以上のパターンを組
み合わせて行ってもよい。また、上記平板同士または波
板同士の接合部の未ろう付け部は、該接合部全面に対し
て10％以上であうのが好ましい。The brazing of the outermost flat plates or corrugated plates is performed such that the brazing portion is partially formed in the axial direction or the circumferential direction of the metal carrier, or partially formed in both the axial direction and the circumferential direction. Done to be done. The shape of the brazing portion is not particularly limited, but may be, for example, a polka dot having a diameter of 1 to 20 mm, a lattice having a width of 1 to 20 mm, a stripe having a width of 1 to 20 mm, or the like. The brazing may be performed using one type of the pattern of the shape of the brazing portion, or may be performed by combining two or more types of patterns. Further, it is preferable that the unbrazed portion of the joint portion between the flat plates or the corrugated plates accounts for 10% or more of the entire joint portion.
上記最外周部の接合部より内側の平板と波板との接合
は、全体的に行っても、部分的に行ってもよいが、好ま
しくは全体的に行う。The joining of the flat plate and the corrugated sheet inside the joining portion at the outermost peripheral portion may be performed entirely or partially, but is preferably performed entirely.
メタル担体は、上記のハニカム体を、外筒、好ましく
は高耐熱ステンレス鋼から成る肉厚１〜2mmの外筒に挿
入し、全体的に、もしくは部分的にろう付けすることに
より製造される。The metal carrier is manufactured by inserting the above-mentioned honeycomb body into an outer cylinder, preferably an outer cylinder made of a high heat-resistant stainless steel and having a thickness of 1 to 2 mm, and brazing the whole or part thereof.
ろう材としては、例えばNi系ろう材を使用することが
できる。As the brazing material, for example, a Ni-based brazing material can be used.
ろう付け処理は、例えば真空中、H2ガス中または不活
性ガス中、1000〜1200℃で、0.5〜５時間行う。The brazing treatment is performed, for example, in a vacuum, in an H 2 gas, or in an inert gas at 1000 to 1200 ° C. for 0.5 to 5 hours.
メタル担体への触媒の担持は、従来公知の方法によっ
て行うことができ、例えばメタル担体に高比表面積アル
ミナコート層を形成し、これに貴金属触媒を担持させる
ことにより行われる。The loading of the catalyst on the metal carrier can be carried out by a conventionally known method, for example, by forming a high specific surface area alumina coat layer on the metal carrier and carrying a noble metal catalyst on this.
上記アルミナコート層には、希土類元素、例えばCe、
Laが含まれていてもよい。The alumina coat layer includes a rare earth element, for example, Ce,
La may be included.
（作用） 本発明の排気ガス浄化用触媒の製造方法では、ハニカ
ム体の最外層部で平板同士または波板同士を1/2周以上
重ね合わせ、この重ね合わせ部分のろう付けを部分的に
行うため、ハニカム体にかかる熱応力が該平板同士また
は波板同士の未ろう付け部分により有効に緩衝される。(Function) In the method for manufacturing an exhaust gas purifying catalyst of the present invention, flat plates or corrugated plates are overlapped at least half a turn at the outermost layer portion of the honeycomb body, and brazing of the overlapped portion is partially performed. Therefore, the thermal stress applied to the honeycomb body is effectively buffered by the unbrazed portions of the flat plates or corrugated plates.
（実施例） 実施例1: 本発明の一実施例の方法により、排気ガス浄化用触媒
を製造する。(Example) Example 1: An exhaust gas purifying catalyst is manufactured by the method of one embodiment of the present invention.
まず、下記の方法により、第１図に示すメタル担体１
を製造する。Cr20重量％、Al5重量％を含み、残部が主
にFeからなる高耐熱性ステンレス鋼を厚さ50μｍの板状
に圧延し、平板２及び波板３に加工する。この平板２と
波板３を重ねて最外周が平板となるように渦巻状に巻き
上げる。平板２は、その下層の波板３の巻き終わり位置
からさらに一周巻き、これにより平板が最外周部で２層
重なるようにする（以下、最外周部の平板の１周目の層
（内周側）を2aと記し、２周目の層（外周側）を2bと記
す）。この平板の重ね合わせ部をろう付けして、直径97
mm、長さ100mmの円柱状のハニカム体4aを製造する。平
板2aより内周側の平板と波板とのろう付けは、両者の当
接部全体にわたって行われ、平板2aと平板2bとのろう付
けは、第２図のハニカム体4aに示すようにメタル担体の
軸に平行な幅10mmのろう付け部6aが、15mmの間隔でスト
ライプ状に形成されるように行われる。各ろう付け部6a
の間は未ろう付け部7aとなる。First, the metal carrier 1 shown in FIG.
To manufacture. A high heat-resistant stainless steel containing 20% by weight of Cr and 5% by weight of Al and the balance of which is mainly made of Fe is rolled into a plate having a thickness of 50 μm and processed into a flat plate 2 and a corrugated plate 3. The flat plate 2 and the corrugated plate 3 are overlapped and spirally wound so that the outermost periphery becomes a flat plate. The flat plate 2 is further wound one turn from the winding end position of the corrugated plate 3 thereunder so that the flat plate overlaps two layers at the outermost peripheral portion (hereinafter, the first peripheral layer of the flat plate at the outermost peripheral portion (the inner peripheral layer). Side) is described as 2a, and the layer of the second round (outer peripheral side) is described as 2b). Braze the overlapped part of this flat plate to
A cylindrical honeycomb body 4a having a length of 100 mm and a length of 100 mm is manufactured. The brazing of the flat plate and the corrugated plate on the inner peripheral side of the flat plate 2a is performed over the entire contact portion between them, and the brazing of the flat plate 2a and the flat plate 2b is performed by a metal as shown in the honeycomb body 4a of FIG. The brazing portions 6a having a width of 10 mm parallel to the axis of the carrier are formed in stripes at intervals of 15 mm. Each brazing part 6a
Between them is the unbrazed portion 7a.
得られたハニカム体4aを、肉厚1.5mm、外径100mm、長
さ100mmの高耐熱性ステンレス鋼、例えばSUS430からな
る外筒５に挿入し、ろう付けして、外径100mm、長さ100
mmのメタル担体１を得る。外筒５とハニカム体4aの平板
2bとのろう付けは全面で行う。The obtained honeycomb body 4a is inserted into an outer cylinder 5 made of a high heat-resistant stainless steel having a thickness of 1.5 mm, an outer diameter of 100 mm and a length of 100 mm, for example, SUS430, and brazed to obtain an outer diameter of 100 mm and a length of 100 mm.
A metal carrier 1 of mm is obtained. Flat plate of outer cylinder 5 and honeycomb body 4a
Brazing with 2b is performed on the entire surface.
次に、活性アルミナ粉末、アルミナ系バインダー及び
水よりなるスラリー上記担体を浸漬し、取り出した後、
余分なスラリーを吹き払い、200℃で２時間乾燥した
後、600℃で２時間焼成して、活性アルミナ層を形成す
る。この活性アルミナ層には、Ce、La等を含んでいても
よい。Next, after immersing the above-mentioned carrier composed of activated alumina powder, alumina-based binder and water and taking out the carrier,
Excess slurry is blown off, dried at 200 ° C. for 2 hours, and fired at 600 ° C. for 2 hours to form an activated alumina layer. This activated alumina layer may contain Ce, La, or the like.
続いて、これにより得られた活性アルミナ層が形成さ
れたメタル担体を、白金アンミン水溶液及び塩化ロジウ
ム水溶液に浸漬し、触媒容積１あたり白金1.0g及びロ
ジウム0.2gの触媒が担持された排気ガス浄化用触媒を得
た。Subsequently, the obtained metal carrier on which the activated alumina layer was formed was immersed in an aqueous solution of platinum ammine and an aqueous solution of rhodium chloride to purify an exhaust gas carrying 1.0 g of platinum and 0.2 g of rhodium per catalyst volume. A catalyst was obtained.
実施例2: 第３図に示すように、平板2aと平板2bとのろう付け
を、直径10mmの円形状のろう付け部6bを、円と円との各
中心間の距離が25mmとなるように間隔をあけて形成し、
その他の部分を非ろう付け部7bとすること以外は、実施
例１と同様の方法によりハニカム体4bを製造し、これを
用いて上記と同様の方法により排気ガス浄化用触媒を製
造した。Example 2: As shown in FIG. 3, brazing of the flat plate 2a and the flat plate 2b was performed by using a circular brazing portion 6b having a diameter of 10 mm so that the distance between the centers of the circles was 25 mm. Formed at intervals,
A honeycomb body 4b was manufactured by the same method as in Example 1 except that the other part was changed to the non-brazing portion 7b, and an exhaust gas purifying catalyst was manufactured by using the honeycomb body 4b by the same method as described above.
実施例3: 第４図に示すように、平板2aと平板2bとのろう付け
を、巾10mmのろう付け部6cが、15mm間隔で縦横に交差し
た格子状とし、該ろう付け部以外の部分が非ろう付け部
となるように行うこと以外は、実施例１と同様の方法に
よりハニカム体4cを製造し、これを用いて上記と同様の
方法により排気ガス浄化用触媒を製造した。Example 3: As shown in FIG. 4, the brazing of the flat plate 2a and the flat plate 2b was performed in a grid shape in which brazing portions 6c having a width of 10 mm crossed vertically and horizontally at an interval of 15 mm, and portions other than the brazing portions were formed. The honeycomb body 4c was manufactured in the same manner as in Example 1 except that the non-brazing portion was used, and an exhaust gas purifying catalyst was manufactured using the honeycomb body 4c in the same manner as described above.
比較例1: 平板2aと平板2bとのろう付けを、全面で行うこと以外
は、実施例１と同様の方法により排気ガス浄化用触媒を
製造した。Comparative Example 1 An exhaust gas purifying catalyst was manufactured in the same manner as in Example 1, except that the flat plate 2a and the flat plate 2b were brazed on the entire surface.
比較例2: 平板2bを含まず、平板2aと外筒とのろう付けを全面で
行うこと以外は実施例１と同様の方法により排気ガス浄
化用触媒を製造した。Comparative Example 2: An exhaust gas purifying catalyst was produced in the same manner as in Example 1, except that the flat plate 2b was not included and the flat plate 2a and the outer cylinder were brazed on the entire surface.
比較例3: 平板2bを含まず、平板2aと外筒とのろう付けを、実施
例１の平板2aと平板2bのろう付けパターンと同じろう付
けパターンで行うこと以外は実施例１と同様の方法によ
り排気ガス浄化用触媒を製造した。Comparative Example 3: Same as Example 1 except that the flat plate 2b was not included and the flat plate 2a and the outer cylinder were brazed by the same brazing pattern as the flat plate 2a and the flat plate 2b of the first embodiment. An exhaust gas purifying catalyst was manufactured by the method.
試験例： 上記実施例１、２及び３並びに比較例１、２及び３で
製造した排気ガス浄化用触媒の耐久試験を行った。ま
ず、3000ccの直列６気筒のエンジンの排気系に、上記の
排気ガス浄化用触媒を取り付け、空燃比（A/F）＝14.6
で、触媒入ガス温度850℃×10分間、300℃×10分間のサ
イクルを300時間（900サイクル）行い、その間のハニカ
ム体と外筒とのズレの発生の有無を調べた。結果を下記
の表に示す。耐久後、排気ガス浄化性能を調べるため
に、同一のエンジンで、2000rpm×−360mmHgの条件で、
HC、CO及びNOxの浄化率（％）を測定した。結果を下記
の表に示す。Test Example: An endurance test was performed on the exhaust gas purifying catalysts manufactured in Examples 1, 2, and 3 and Comparative Examples 1, 2, and 3. First, the above exhaust gas purifying catalyst was attached to the exhaust system of a 3000 cc in-line six-cylinder engine, and the air-fuel ratio (A / F) = 14.6
Then, a cycle of a catalyst-containing gas temperature of 850 ° C. × 10 minutes and a temperature of 300 ° C. × 10 minutes was performed for 300 hours (900 cycles), and it was examined whether or not there was a deviation between the honeycomb body and the outer cylinder during that time. The results are shown in the table below. After the endurance, to examine the exhaust gas purification performance, the same engine, under conditions of 2000rpm × -360mmHg,
HC, was measured purification rate of CO and NO x (%) of. The results are shown in the table below.
実施例１〜３は、耐久300時間後でもハニカム体のズ
レ等の問題を生じることがなく、他に比べ、構造信頼性
が格段に向上している。また、構造上の不具合に伴う触
媒コートの剥離もなく、触媒性能も著しく向上してい
る。 In Examples 1 to 3, there was no problem such as displacement of the honeycomb body even after 300 hours of durability, and the structural reliability was remarkably improved as compared with the others. In addition, there is no peeling of the catalyst coat due to structural defects, and the catalyst performance is remarkably improved.
これに対し、比較例１は最外周を２層にしているが、
該層を全面で接合しているため、応力の緩衝が充分にな
されず、ハニカム体が外筒からずれる結果となる。ま
た、比較例２は最外周の平板が１層であり、しかも、該
層と外筒が全面で接合されているため、ハニカム体が外
筒からずれる結果となり、しかも排気ガス浄化率も低
い。また、比較例３は最外周の平板が１層であるため、
耐久性及び浄化性能の両方の点で実施例１〜３に劣る
が、該層と外筒は軸方向または周方向で部分的に接合さ
れているため、全面で接合された比較例２に比べると、
耐久性及び浄化性能の両方の点で優れている。On the other hand, in Comparative Example 1, the outermost circumference has two layers,
Since the layers are joined on the entire surface, the buffering of the stress is not sufficiently performed, and the honeycomb body is shifted from the outer cylinder. Further, in Comparative Example 2, since the outermost flat plate has one layer, and the layer and the outer cylinder are joined on the entire surface, the honeycomb body is shifted from the outer cylinder, and the exhaust gas purification rate is low. In Comparative Example 3, since the outermost flat plate had only one layer,
Although it is inferior to Examples 1 to 3 in both durability and purification performance, since the layer and the outer cylinder are partially joined in the axial direction or the circumferential direction, they are compared with Comparative Example 2 in which the entire surface is joined. When,
Excellent in both durability and purification performance.
このことは、本発明の排気ガス浄化用触媒の製造方法
において、最外層の平板を２層にしたことと、ろう付け
を部分的に行うことの両方により、耐久性及び浄化性能
が向上していることが明らかである。This means that in the method for producing an exhaust gas purifying catalyst of the present invention, the durability and purification performance are improved by both using the two outermost flat plates and partially performing brazing. It is clear that there is.
（発明の効果） 本発明の排気ガス浄化用触媒の製造方法は、メタル担
体のハニカム体の作成にあたり、平板と波板とを重ね合
わせて渦巻状に巻き、外周部においては平板同士または
波板同士を重ね合わせ、該重ね合わせ部を部分的にろう
付けしてないため、メタル担体に生ずる熱応力が有効に
緩衝され、ハニカム体の破断、ハニカム体と外筒とのズ
レが生じることがなく、従って、耐久性及び触媒性能に
優れている触媒が得られる。(Effects of the Invention) In the method for producing an exhaust gas purifying catalyst of the present invention, a flat plate and a corrugated plate are superposed and spirally wound on a metal body in the preparation of a honeycomb body. Since the overlapped portions are not brazed partially, the thermal stress generated in the metal carrier is effectively buffered, so that the honeycomb body is not broken, and the honeycomb body and the outer cylinder do not shift. Therefore, a catalyst having excellent durability and catalytic performance can be obtained.
第１図は本発明の一実施例で製造したメタル担体の４分
の１部分を示す断面図、第２図は該メタル担体のハニカ
ム体を示す斜視図、第３図は本発明の他の実施例で製造
したハニカム体を示す斜視図、第４図は本発明の他の実
施例で製造したハニカム体を示す斜視図である。 １……メタル担体、2,2a,2b……平板 ３……波板、4a,4b,4c……ハニカム体 ５……外筒、6a,6b,6c……ろう付け部 7a,7b,7c……非ろう付け部FIG. 1 is a cross-sectional view showing a quarter portion of a metal carrier manufactured in one embodiment of the present invention, FIG. 2 is a perspective view showing a honeycomb body of the metal carrier, and FIG. FIG. 4 is a perspective view showing a honeycomb body manufactured in the embodiment, and FIG. 4 is a perspective view showing a honeycomb body manufactured in another embodiment of the present invention. 1 ... metal carrier, 2, 2a, 2b ... flat plate 3 ... corrugated plate, 4a, 4b, 4c ... honeycomb body 5 ... outer cylinder, 6a, 6b, 6c ... brazing parts 7a, 7b, 7c ...... Non-brazing part
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B01J 21/00 - 38/74──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 6 , DB name) B01J 21/00-38/74
Claims (1)
き上げ、平板または波板のうち最外周を構成する方の板
のみを最外周部においてさらに0.5周以上巻くことによ
り、最外周部で平板同士または波板同士を全外周の1/2
以上重ね合わせ、該重ね合わせた最外周部の平板同士ま
たは波板同士を部分的にろう付けしてハニカム体を形成
し、該ハニカム体を外筒に挿入してメタル担体を作成
し、該メタル担体に触媒を担持することを特徴とする排
気ガス浄化用触媒の製造方法。1. A flat plate and a corrugated sheet are overlapped and spirally wound up, and only the plate constituting the outermost periphery of the flat plate or the corrugated sheet is further wound 0.5 times or more at the outermost peripheral portion, so that the outermost periphery is obtained. Between flat plates or corrugated plates at half
Laminated above, the flat plate or corrugated plate of the outermost peripheral portion thus laminated is partially brazed to form a honeycomb body, and the honeycomb body is inserted into an outer cylinder to form a metal carrier, and the metal carrier is formed. A method for producing a catalyst for purifying exhaust gas, comprising supporting a catalyst on a carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1097897A JP2788995B2 (en) | 1989-04-18 | 1989-04-18 | Method for producing exhaust gas purifying catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1097897A JP2788995B2 (en) | 1989-04-18 | 1989-04-18 | Method for producing exhaust gas purifying catalyst |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02277552A JPH02277552A (en) | 1990-11-14 |
| JP2788995B2 true JP2788995B2 (en) | 1998-08-20 |
Family
ID=14204537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1097897A Expired - Lifetime JP2788995B2 (en) | 1989-04-18 | 1989-04-18 | Method for producing exhaust gas purifying catalyst |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2788995B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4112354A1 (en) * | 1991-04-16 | 1992-10-22 | Behr Gmbh & Co | DEVICE FOR CATALYTIC DETOXING OF EXHAUST GAS |
| JP2002184620A (en) * | 2000-12-19 | 2002-06-28 | Honda Motor Co Ltd | Rare earth magnet unit |
| JP2005313084A (en) * | 2004-04-28 | 2005-11-10 | Calsonic Kansei Corp | Catalyst carrier made of metal |
-
1989
- 1989-04-18 JP JP1097897A patent/JP2788995B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02277552A (en) | 1990-11-14 |
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