JPH09155203A - Composite carrier for purifying exhaust gas - Google Patents
Composite carrier for purifying exhaust gasInfo
- Publication number
- JPH09155203A JPH09155203A JP7323260A JP32326095A JPH09155203A JP H09155203 A JPH09155203 A JP H09155203A JP 7323260 A JP7323260 A JP 7323260A JP 32326095 A JP32326095 A JP 32326095A JP H09155203 A JPH09155203 A JP H09155203A
- Authority
- JP
- Japan
- Prior art keywords
- honeycomb body
- ceramic honeycomb
- ceramic
- metal
- exhaust gas
- 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
- 239000002131 composite material Substances 0.000 title claims description 13
- 239000000919 ceramic Substances 0.000 claims abstract description 52
- 239000011888 foil Substances 0.000 claims abstract description 18
- 239000003566 sealing material Substances 0.000 claims abstract description 12
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 7
- 238000004804 winding Methods 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 53
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 238000000746 purification Methods 0.000 abstract description 6
- 238000009413 insulation Methods 0.000 abstract 1
- 238000010030 laminating Methods 0.000 abstract 1
- 239000003054 catalyst Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000004913 activation Effects 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910052878 cordierite Inorganic materials 0.000 description 3
- 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 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910002060 Fe-Cr-Al alloy Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Landscapes
- Catalysts (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は自動車排ガスを浄化
する触媒担持用複合担体に関し、特に、エンジン始動
時、あるいは一時停止後の再起動時における初期の反応
性の高い複合担体に係わるものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst-supporting composite carrier for purifying automobile exhaust gas, and more particularly to a composite carrier having a high initial reactivity at the time of engine start or restart after a temporary stop. .
【０００２】[0002]
【従来の技術】自動車の排ガスを浄化するためにその排
気系に設置される触媒担体は、触媒を担持するハニカム
体がセラミック製に代わってメタル製が次第に用いられ
るようになっている。2. Description of the Related Art As a catalyst carrier installed in an exhaust system for purifying exhaust gas of an automobile, a honeycomb body carrying a catalyst is gradually made of metal instead of ceramic.
【０００３】セラミックハニカム体は主としてコーデェ
ライトで構成され、耐熱性が高く、かつ熱膨脹係数が低
いが、機械的強度は高々４０kgf/cm2 であり、また衝撃
に対して弱いため、排ガスを通すセルを形成するハニカ
ム壁の厚さは、ほぼ１７０μｍと厚くなり、従って保温
性はすぐれているが、セル開口率も７０％に過ぎないた
め排気に対する圧力損失も大きく、かつ、エンジン始動
時などの熱エネルギーの低い排気ガスとの接触では触媒
活性温度に達するのに時間がかかる。The ceramic honeycomb body is mainly composed of cordierite, has a high heat resistance and a low coefficient of thermal expansion, but has a mechanical strength of at most 40 kgf / cm 2 and is vulnerable to an impact, and therefore a cell through which exhaust gas is passed. The thickness of the honeycomb wall that forms the cells is as thick as 170 μm, and therefore the heat retention is excellent, but since the cell opening ratio is only 70%, the pressure loss with respect to the exhaust gas is large, and the heat generated when the engine is started. In contact with exhaust gas of low energy, it takes time to reach the catalyst activation temperature.
【０００４】一方、メタルハニカム体は、平らな箔と波
加工した波箔を重ね合わせて巻回して形成され、この箔
にはＡｌを含有するフェライト系ステンレス鋼であって
箔の厚さはほぼ５０μｍ以下のものが用いられる。すな
わち、従来のセラミックハニカム体の壁厚に比べて１／
３以下の厚さであるため、セル開口率も大きく従って圧
損も小さくでき、かつ熱容量を小さくできるために急速
加熱が可能であり、触媒の活性化には有利であるが、箔
圧延や加工および接合が難しく、製造コストも安くなら
ない。また熱膨脹係数も大きい。On the other hand, the metal honeycomb body is formed by superposing and winding a flat foil and a corrugated foil, which is made of ferritic stainless steel containing Al and has a thickness of almost the same. Those having a thickness of 50 μm or less are used. That is, compared with the wall thickness of the conventional ceramic honeycomb body, 1 /
Since the thickness is 3 or less, the cell opening ratio is large and thus the pressure loss can be small, and the heat capacity can be small, so that rapid heating is possible, which is advantageous for activation of the catalyst, but it is advantageous for foil rolling, processing and Joining is difficult and the manufacturing cost is not low. The coefficient of thermal expansion is also large.
【０００５】この様に両者は一長一短があり、それぞれ
の長所を生かす使用が検討されている。例えば、一排気
系に高温部、すなわちマニホールド直下にメタル担体
を、アンダーフロー側にセラミック担体を用いた例もあ
るが、それぞれの担体についての効用は果すものの、組
合わせによる特別の効果は見られない。As described above, both have advantages and disadvantages, and the use of each of them has been studied. For example, there is an example in which a metal carrier is used in one exhaust system at a high temperature part, that is, immediately below the manifold, and a ceramic carrier is used on the underflow side, but although the effects of each carrier are achieved, the special effect of the combination is seen. Absent.
【０００６】特開平４−３４１３４８号公報には、図３
に示すように、メタルハニカム体１１の外周にセラミッ
ク担体１０を配置する担体が浄化性能向上の目的で提案
されているが、それぞれの熱膨張特性に差があるため、
熱膨張しないセラミック担体１０に接している部分のメ
タルハニカム体１１は座屈して、繰り返し使用する内
に、ハニカム体１０，１１間に隙間ができ、振動でのが
たつきや、衝撃でセラミックハニカム体１０が割れるこ
とがある。また、ハニカム体間の隙間により浄化性能も
低下してくる。Japanese Unexamined Patent Publication No. 4-341348 discloses a structure shown in FIG.
As shown in, a carrier in which the ceramic carrier 10 is arranged on the outer periphery of the metal honeycomb body 11 has been proposed for the purpose of improving the purification performance, but since the respective thermal expansion characteristics are different,
The portion of the metal honeycomb body 11 that is in contact with the ceramic carrier 10 that does not thermally expand buckles, and a gap is formed between the honeycomb bodies 10 and 11 during repeated use, which causes rattling due to vibration or shock, and thus the ceramic honeycomb. The body 10 may crack. In addition, the purification performance also decreases due to the gaps between the honeycomb bodies.
【０００７】一方、特開平６−２４１０３７号公報に
は、図４に示すようにセラミックハニカム体１０を内側
にし、メタルハニカム体１１をその外側に配置した二重
構造のハニカム体１２が、セラミックハニカム１０を外
部衝撃から保護する目的で提案されているが、セラミッ
クハニカム体１０よりメタルハニカム体１１の熱膨脹係
数が大きいため、繰返し使用の内にハニカム体間に隙間
ができ、振動でのがたつきや、衝撃で割れが起こること
もある。On the other hand, in Japanese Unexamined Patent Publication No. 6-241037, a double-structured honeycomb body 12 having a ceramic honeycomb body 10 inside and a metal honeycomb body 11 outside as shown in FIG. 4 is a ceramic honeycomb. 10 has been proposed for the purpose of protecting it from an external impact, but since the thermal expansion coefficient of the metal honeycomb body 11 is larger than that of the ceramic honeycomb body 10, a gap is formed between the honeycomb bodies during repeated use, which causes rattling due to vibration. Or, a shock may cause cracking.
【０００８】[0008]
【発明が解決しようとする課題】本発明は上記のような
問題を解消しようとするものであって、メタルハニカム
体とセラミックハニカム体を同一ケーシング内に直列に
配置することにより、それぞれのハニカム体の長所を生
かし、排ガスの浄化効率を向上させる複合担体を提供す
ることを目的をする。DISCLOSURE OF THE INVENTION The present invention is intended to solve the above problems, and by disposing the metal honeycomb body and the ceramic honeycomb body in series in the same casing, the respective honeycomb bodies are provided. It is an object of the present invention to provide a composite carrier that takes advantage of the above advantages and improves exhaust gas purification efficiency.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に本発明は、以下の構成を要旨とする。すなわち、耐熱
性金属箔よりなる平箔と波箔とを重ねて巻回し、渦巻き
状に形成したメタルハニカム体と、セラミックハニカム
体とを、メタルハニカム体外周には非膨脹性弾性シール
材を、セラミックハニカム体の外周には膨脹性弾性シー
ル材をそれぞれ介在せしめてケーシング内に直列装入し
てなることを特徴とする排ガス浄化用複合担体である。
この際、メタルハニカム体を上流側にし、セラミックハ
ニカム体を下流側にして直列配置し、或いはさらにこれ
らの配置を交互に実施してもよく、これによりメタル担
体の加熱と保温を効率よく行える。さらに上記配列は、
セラミックハニカム体の間にメタルハニカム体を配置す
る構成にしてもよい。In order to achieve the above object, the present invention has the following structures. That is, a flat foil and a corrugated foil made of a heat-resistant metal foil are overlapped and wound, and a spirally formed metal honeycomb body, a ceramic honeycomb body, and a non-expandable elastic seal material around the metal honeycomb body, A composite carrier for purifying exhaust gas, characterized in that an expandable elastic sealing material is respectively interposed on the outer periphery of a ceramic honeycomb body and is serially charged in a casing.
At this time, the metal honeycomb bodies may be arranged on the upstream side and the ceramic honeycomb bodies may be arranged on the downstream side in series, or these arrangements may be alternately performed, whereby heating and heat retention of the metal carrier can be efficiently performed. Furthermore, the above sequence is
The metal honeycomb body may be arranged between the ceramic honeycomb bodies.
【００１０】[0010]
【発明の実施の形態】以下本発明を図に示す実施例に基
づいて詳細に説明する。図１は排ガス系に接続するケー
シング１内にハニカム体を直列に配置した場合の断面説
明図である。すなわち、図において２は平箔と波箔とを
重ね合わせて渦巻状に形成したメタルハニカム体であ
り、排気ガスの入側、すなわち上流側に配置され、か
つ、ケーシング１との間にはシール材４として非膨脹性
弾性断熱材を充填して固定している。３はセラミックハ
ニカム体であり、その外周、すなわちケーシング１との
間にはシール材５として膨脹性弾性緩衝材を充填し、メ
タルハニカム体２の下流側に配置固定される。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a cross-sectional explanatory view of a case where honeycomb bodies are arranged in series in a casing 1 connected to an exhaust gas system. That is, in the figure, reference numeral 2 denotes a metal honeycomb body in which a flat foil and a corrugated foil are overlapped to form a spiral shape, which is arranged on the exhaust gas inlet side, that is, on the upstream side, and has a seal between the casing 1 and the casing. As the material 4, a non-expandable elastic heat insulating material is filled and fixed. Reference numeral 3 denotes a ceramic honeycomb body, and an expandable elastic cushioning material is filled as a sealing material 5 between the outer periphery thereof, that is, the casing 1 and is arranged and fixed on the downstream side of the metal honeycomb body 2.
【００１１】この様に、本発明においては上流側にシー
ル材に被覆されたメタルハニカム体２を配置することに
より、最初に排ガスと接触し、メタルハニカム体の熱容
量が小さいため、エンジン可動開始時の熱エネルギーの
小さい排ガス流と接触しても昇温が早く、従って温度降
下の少ないガス流がセラミックハニカム体に供給される
ことになる。すなわち、従来のメタル担体のように、ハ
ニカム体と金属製外筒とが直接接合されているため、外
気に晒されている外筒の放熱や抜熱にともなってハニカ
ム体よりも抜熱され、ハニカム体の温度上昇が妨げられ
るようなことはなく、触媒が自己反応する活性温度に達
する時間が短くてすむと共にセラミックハニカム体へ温
度降下の少ないガスが供給される。As described above, according to the present invention, by disposing the metal honeycomb body 2 covered with the sealing material on the upstream side, the metal honeycomb body 2 comes into contact with exhaust gas first and the heat capacity of the metal honeycomb body is small. Even if it contacts the exhaust gas flow having low heat energy, the temperature rises quickly, and therefore a gas flow with a small temperature drop is supplied to the ceramic honeycomb body. That is, like a conventional metal carrier, since the honeycomb body and the metal outer cylinder are directly joined, heat is removed from the honeycomb body by heat dissipation and heat removal of the outer cylinder exposed to the outside air, The temperature rise of the honeycomb body is not hindered, and the time required for the catalyst to reach the activation temperature at which it self-reacts can be shortened and a gas with a small temperature drop is supplied to the ceramic honeycomb body.
【００１２】一方、セラミックハニカム体はメタルハニ
カム体に比べて加熱速度は遅いが、加熱されたメタルハ
ニカム体からの輻射熱や、供給される温度降下の少ない
ガス流により、セラミックハニカム体単体で用いられる
ときより早く昇温する。On the other hand, although the ceramic honeycomb body has a slower heating rate than the metal honeycomb body, it is used as a single ceramic honeycomb body due to the radiant heat from the heated metal honeycomb body and the supplied gas flow with a small temperature drop. The temperature rises faster than when.
【００１３】エンジン停止時などの冷却時には、セラミ
ックハニカム体自体の温度降下が遅いため保温効果があ
り、メタルハニカム体自体の冷却速度が早いとしても、
セラミックハニカム体の輻射熱で保温され、再始動する
に際しての、メタルハニカム体の熱効率を向上させる役
割を果たしている。During cooling, such as when the engine is stopped, the temperature drop of the ceramic honeycomb body itself is slow, so that there is a heat retaining effect, and even if the cooling rate of the metal honeycomb body itself is high,
It is kept warm by the radiant heat of the ceramic honeycomb body and plays a role in improving the thermal efficiency of the metal honeycomb body when restarting.
【００１４】この様な効果を奏するためにシール材４，
５は重要な役割を果たしており、本発明ではメタルハニ
カム体に用いるシール材としては、ケーシングとの熱伝
導を遮断する断熱性を有すると共に、メタルハニカム体
が高温で熱膨張するためにその際に加圧（圧縮）力が作
用しないように非膨脹性の弾性材を用いるのがよく、こ
れには例えばアルミナ繊維、セラミック繊維、ムライト
繊維等が挙げられる。In order to achieve such an effect, the sealing material 4,
5 plays an important role, and in the present invention, the sealing material used for the metal honeycomb body has a heat insulating property for blocking heat conduction with the casing, and the metal honeycomb body thermally expands at a high temperature. It is preferable to use a non-expandable elastic material so that a pressure (compression) force does not act, and examples thereof include alumina fiber, ceramic fiber, mullite fiber and the like.
【００１５】セラミックハニカム体のシールには、セラ
ミックハニカム体自体は熱膨張性が小さいが、ケーシン
グが熱膨張するためにこれに準じて熱膨張する材質が適
用される。For the seal of the ceramic honeycomb body, a material is used which has a small thermal expansion property in the ceramic honeycomb body itself, but is thermally expanded in accordance with the thermal expansion of the casing.
【００１６】メタルハニカム体とセラミックハニカム体
の間隙は狭い方が良く、２〜２０mm程度とするのが望ま
しい。本発明において上流側をメタルハニカム体、下流
側をセラミックハニカム体配置とする組合わせは一対の
みならず、二対以上設けてもよい。It is preferable that the gap between the metal honeycomb body and the ceramic honeycomb body is narrow, and it is desirable that the gap is about 2 to 20 mm. In the present invention, the combination in which the upstream side is the metal honeycomb body arrangement and the downstream side is the ceramic honeycomb body arrangement is not limited to one pair, and two or more pairs may be provided.
【００１７】図２は本発明の別な例を示すものであっ
て、ハニカム体Ａ，Ｂ，Ａの３個を組合わせて並列配置
する。すなわちＡはセラミックハニカム体、Ｂはメタル
ハニカム体でありセラミックハニカム体Ａ，Ａ間に挟ま
れている。このような配置にすることにより、前記した
ように、メタルハニカム体Ｂに初期（エンジン始動時）
加熱の昇温効果を持たせ、冷却−昇温時における保温効
果をセラミックハニカム体Ａ，Ａに持たせるものであ
り、特にメタルハニカム体Ｂは上下流両側から加熱され
るためにメタルハニカム体の保温効果は大きく、触媒効
率を向上させる。FIG. 2 shows another example of the present invention, in which three honeycomb bodies A, B and A are combined and arranged in parallel. That is, A is a ceramic honeycomb body and B is a metal honeycomb body sandwiched between the ceramic honeycomb bodies A and A. With such an arrangement, as described above, the metal honeycomb body B is initially set (when the engine is started).
The ceramic honeycomb bodies A, A have a heating effect of heating and a heat retaining effect at the time of cooling-heating. Particularly, since the metal honeycomb body B is heated from both upstream and downstream sides, It has a great heat retaining effect and improves catalyst efficiency.
【００１８】この配置はＡをメタルハニカム体、Ｂをセ
ラミックハニカム体としてもよく、また、各ハニカム体
の長さ（幅）を小さくして、これらを二対以上配置する
こともできる。この際ケーシングとの間に充填するシー
ル材はそれぞれに対応した膨脹、非膨脹弾性材を用いる
ことが必要である。In this arrangement, A may be a metal honeycomb body and B may be a ceramic honeycomb body, and the length (width) of each honeycomb body may be reduced to arrange two or more pairs. At this time, it is necessary to use expansion and non-expansion elastic materials corresponding to the sealing materials filled in the casing.
【００１９】[0019]
［実施例］図１に示すように、Ｆｅ−Ｃｒ−Ａｌフェラ
イト系ステンレスの厚み５０μｍの平箔と波箱を重ね巻
き回し、直径８９mm、長さ８０mm、セル密度４００個／
in2 のメタルハニカム体２を形成する。メタルハニカム
体の平箔と波箱は拡散接合で接合した。[Example] As shown in FIG. 1, a flat foil of Fe-Cr-Al ferritic stainless steel having a thickness of 50 μm and a wave box were overlapped and wound, and the diameter was 89 mm, the length was 80 mm, and the cell density was 400 cells /
An in 2 metal honeycomb body 2 is formed. The flat foil of the metal honeycomb body and the wave box were joined by diffusion joining.
【００２０】一方、コージェライト製の壁厚１７０μｍ
の４００個／in2 の直径８９mm、長さ８０mmのセラミッ
クハニカム体３を作成した。On the other hand, the wall thickness of cordierite is 170 μm
A ceramic honeycomb body 3 having a diameter of 89 mm and a length of 80 mm of 400 pieces / in 2 was prepared.
【００２１】メタルハニカム体２には厚み６mm、長さ６
０mmで０．２ｇ／cm3 の嵩密度に圧縮成形されたアルミ
ナ繊維の成形体４を巻き、セラミックハニカム体３に
は、厚み６mm、長さ６０mmの膨脹性成形体５を巻きつけ
た。そして、各々のハニカム体２，３と成形体４，５を
ステンレス製の板厚１．５mmからなる一つのケーシング
１内に、ガス入口側にメタルハニカム体２をセットし、
各ハニカム体２，３間の間隙は１０mmとなるように装着
した。The metal honeycomb body 2 has a thickness of 6 mm and a length of 6
A molded body 4 of alumina fibers compression-molded to a bulk density of 0.2 g / cm 3 at 0 mm was wound, and an expandable molded body 5 having a thickness of 6 mm and a length of 60 mm was wound around the ceramic honeycomb body 3. Then, the honeycomb bodies 2 and 3 and the formed bodies 4 and 5 are set in one casing 1 made of stainless steel and having a plate thickness of 1.5 mm, and the metal honeycomb body 2 is set on the gas inlet side,
The honeycomb bodies 2 and 3 were mounted so that the gap between them was 10 mm.
【００２２】得られた複合担体を（図５に示すように）
２０００ccのガソリンエンジンの排気系に排気マニホー
ルド１０から９０cmの位置に装着し、常温から入ガス温
Ｔ0５００℃に昇温し、５分間保持した後、常温まで昇
温し、５分間保持し、再び５００℃まで昇温するパター
ンを繰り返して、各ハニカム体の中心部の温度Ｔ1 ，Ｔ
2 を熱電対で測温した。結果を図７に示す。The resulting composite carrier (as shown in FIG. 5)
The exhaust system of a 2000 cc gasoline engine was installed at a position 90 cm from the exhaust manifold 10 and heated from room temperature to an inlet gas temperature T 0 of 500 ° C. and held for 5 minutes, then heated to room temperature and held for 5 minutes. By repeating the pattern of raising the temperature to 500 ° C. again, the temperatures T 1 and T at the center of each honeycomb body are
The temperature of 2 was measured with a thermocouple. FIG. 7 shows the results.
【００２３】［比較例］図６に示すように、実施例と同
様にＦｅ−Ｃｒ−Ａｌフェライト系ステンレスの厚み５
０μｍの平箔と波箱を重ね、巻き回し、直径８９mm、長
さ８０mm、セル密度４００個／in2 のメタルハニカム体
２を形成し、ステンレス製の板厚１．５mmからなる内径
８９mmのケーシング６に圧入し、平箔と波箱とを拡散接
合でハニカム体とケーシングをロウ付けで接合し、従来
型のメタル担体７を形成する。[Comparative Example] As shown in FIG. 6, the thickness of the Fe-Cr-Al ferritic stainless steel was 5 as in the example.
A 0 μm flat foil and a wave box are stacked and wound to form a metal honeycomb body 2 having a diameter of 89 mm, a length of 80 mm and a cell density of 400 cells / in 2 , and a casing made of stainless steel and having an inner diameter of 89 mm and an inner diameter of 89 mm. Then, the flat metal foil and the corrugated box are diffusion-bonded to each other and the honeycomb body and the casing are bonded to each other by brazing to form a conventional metal carrier 7.
【００２４】一方、コージェライト製の壁厚１７０μｍ
の４００個／in2 の直径８９mm、長さ８０mmのセラミッ
クハニカム体３を作成した。セラミックハニカム体３に
は、厚み６mm、長さ６０mmの膨脹性成形体５を巻きつけ
て、ステンレス製の板厚１．５mmからなるケーシング８
に装着し、セラミック担体９を形成した。On the other hand, the wall thickness of cordierite is 170 μm
A ceramic honeycomb body 3 having a diameter of 89 mm and a length of 80 mm of 400 pieces / in 2 was prepared. A casing 8 made of stainless steel and having a thickness of 1.5 mm is formed by winding an expandable molded body 5 having a thickness of 6 mm and a length of 60 mm around the ceramic honeycomb body 3.
Then, the ceramic carrier 9 was formed.
【００２５】得られたメタル担体７とセラミック担体９
を実施例と同じく、２０００ccのガソリンエンジンの排
気系に排気マニホールド１０から３０cmの位置にメタル
担体７を、９０cmの位置にセラミック担体９を装着し、
昇温降温を繰り返し、同様に各担体温度Ｔ3 ，Ｔ4 を測
温した。結果を図８に示す。The obtained metal carrier 7 and ceramic carrier 9
As in the embodiment, the metal carrier 7 is installed at a position 30 cm from the exhaust manifold 10 and the ceramic carrier 9 is installed at a position 90 cm from the exhaust system of the 2000 cc gasoline engine.
The temperature of each carrier T 3 and T 4 was measured in the same manner by repeatedly raising and lowering the temperature. The results are shown in Fig. 8.
【００２６】本実施例では図７より降温時、メタルハニ
カムとセラミックハニカムがほぼ同様の降温挙動を示す
ことがわかる。メタルハニカムとセラミックハニカムの
相互作用により、降温速度勾配がゆるやかになる効果が
ある。In this example, it can be seen from FIG. 7 that the metal honeycomb and the ceramic honeycomb exhibit almost the same temperature-decreasing behavior when the temperature is lowered. The interaction between the metal honeycomb and the ceramic honeycomb has the effect of making the temperature decrease rate gradient gentle.
【００２７】従って、次の昇温時には、担体に十分な余
熱が比較例に比べて残っているため、特にメタル担体の
昇温が早くなり、１サイクル運転後の２サイクル目昇温
時において担体温度が触媒活性温度３５０℃に到達する
までの時間を早めることができる。本実施例は比較例に
比べて約３０％触媒不活性時間を短縮することができ
た。Therefore, at the time of the next temperature rise, sufficient residual heat remains in the carrier as compared with the comparative example, so that the temperature of the metal carrier rises particularly quickly, and the carrier is heated during the second cycle after one cycle of operation. The time required for the temperature to reach the catalyst activation temperature of 350 ° C. can be shortened. In this example, the catalyst inactivation time could be shortened by about 30% as compared with the comparative example.
【００２８】[0028]
【発明の効果】以上説明した通り、本発明はメタルハニ
カム体とセラミックハニカム体を直列に配置することに
より、それぞれのハニカム体の長所を生かし、排ガスの
浄化効率を向上させる排ガス浄化用複合担体を得ること
ができた。As described above, according to the present invention, a composite carrier for exhaust gas purification that improves the efficiency of exhaust gas purification by arranging a metal honeycomb body and a ceramic honeycomb body in series to take advantage of the respective honeycomb bodies is provided. I was able to get it.
【図１】本発明複合担体の断面説明図。FIG. 1 is an explanatory cross-sectional view of a composite carrier of the present invention.
【図２】本発明複合担体の他の例を示す説明図。FIG. 2 is an explanatory view showing another example of the composite carrier of the present invention.
【図３】従来の触媒担体の断面を示す説明図。FIG. 3 is an explanatory view showing a cross section of a conventional catalyst carrier.
【図４】従来の２重構造のハニカム体を示す斜視図。FIG. 4 is a perspective view showing a conventional double-structured honeycomb body.
【図５】本発明複合担体の実施例を示す説明図。FIG. 5 is an explanatory view showing an example of the composite carrier of the present invention.
【図６】比較例を示す説明図。FIG. 6 is an explanatory view showing a comparative example.
【図７】本発明実施例の温度測定結果を示す図。FIG. 7 is a diagram showing a temperature measurement result of an example of the present invention.
【図８】比較例の温度測定結果を示す図。FIG. 8 is a diagram showing a temperature measurement result of a comparative example.
１ ：ケーシング ２ ：メタルハニカム体 ３ ：セラミックハニカム体 ４ ：シール材 ５ ：シール材 Ａ，Ｂ ：ハニカム体 ６ ：ケーシング ７ ：メタル担体 ８ ：ケーシング ９ ：セラミック担体 １０ ：排気マニホールド Ｔ0 ：入ガス温 Ｔ1 ，Ｔ2 ，Ｔ3 ，Ｔ4 ：ハニカム体温度1: Casing 2: Metal honeycomb body 3: Ceramic honeycomb body 4: Sealing material 5: Sealing material A, B: Honeycomb body 6: Casing 7: Metal carrier 8: Casing 9: Ceramic carrier 10: Exhaust manifold T 0 : Inlet gas temperature T 1, T 2, T 3 , T 4: honeycomb body temperature
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０１Ｎ 3/28 ３１１ Ｆ０１Ｎ 3/28 ３１１Ｍ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location F01N 3/28 311 F01N 3/28 311M
Claims (3)
ねて巻回し、渦巻き状に形成したメタルハニカム体とセ
ラミックハニカム体とを、メタルハニカム体外周には非
膨脹性弾性シール材を、セラミックハニカム体の外周に
は膨脹性弾性シール材をそれぞれ介在せしめてケーシン
グ内に直列装入してなることを特徴とする排ガス浄化用
複合担体。1. A metal honeycomb body and a ceramic honeycomb body, which are formed by spirally winding a flat foil and a corrugated foil made of a heat-resistant metal foil, and spirally forming the non-expandable elastic sealing material on the outer periphery of the metal honeycomb body. A composite carrier for purifying exhaust gas, characterized in that the ceramic honeycomb body is inserted in series in the casing with an expandable elastic sealing material interposed therebetween, respectively.
ックハニカム体を下流側にして直列配置したことを特徴
とする請求項１記載の排ガス浄化用複合担体。2. The exhaust gas-purifying composite carrier according to claim 1, wherein the metal honeycomb body is arranged on the upstream side and the ceramic honeycomb body is arranged on the downstream side in series.
カム体を配置して直列したことを特徴とする請求項１記
載の排ガス浄化用複合担体。3. The exhaust gas-purifying composite carrier according to claim 1, wherein a metal honeycomb body is arranged between the ceramic honeycomb bodies and connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7323260A JPH09155203A (en) | 1995-12-12 | 1995-12-12 | Composite carrier for purifying exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7323260A JPH09155203A (en) | 1995-12-12 | 1995-12-12 | Composite carrier for purifying exhaust gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09155203A true JPH09155203A (en) | 1997-06-17 |
Family
ID=18152812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7323260A Pending JPH09155203A (en) | 1995-12-12 | 1995-12-12 | Composite carrier for purifying exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09155203A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999002263A1 (en) * | 1997-07-10 | 1999-01-21 | The University Court Of The University Of Dundee | Monolith |
| WO2002081880A1 (en) * | 2001-04-03 | 2002-10-17 | Ngk Insulators,Ltd. | Honeycomb structure and its assembly |
| EP1524031A1 (en) * | 2003-10-17 | 2005-04-20 | Ngk Insulators, Ltd. | Honeycomb structure and catalytic converter |
| JP2006077591A (en) * | 2004-09-07 | 2006-03-23 | Hino Motors Ltd | Exhaust emission control device |
| US7487763B2 (en) | 2004-06-09 | 2009-02-10 | Fuji Kihan Co., Ltd. | Fuel reformer |
| JP2011021485A (en) * | 2009-07-13 | 2011-02-03 | Isuzu Motors Ltd | Exhaust emission control device for automobile |
-
1995
- 1995-12-12 JP JP7323260A patent/JPH09155203A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999002263A1 (en) * | 1997-07-10 | 1999-01-21 | The University Court Of The University Of Dundee | Monolith |
| WO2002081880A1 (en) * | 2001-04-03 | 2002-10-17 | Ngk Insulators,Ltd. | Honeycomb structure and its assembly |
| US7041359B2 (en) | 2001-04-03 | 2006-05-09 | Ngk Insulators, Ltd. | Honeycomb structure and assembly thereof |
| EP1524031A1 (en) * | 2003-10-17 | 2005-04-20 | Ngk Insulators, Ltd. | Honeycomb structure and catalytic converter |
| US7438868B2 (en) | 2003-10-17 | 2008-10-21 | Ngk Insulators, Ltd. | Honeycomb structure and catalytic converter |
| US7487763B2 (en) | 2004-06-09 | 2009-02-10 | Fuji Kihan Co., Ltd. | Fuel reformer |
| JP2006077591A (en) * | 2004-09-07 | 2006-03-23 | Hino Motors Ltd | Exhaust emission control device |
| JP2011021485A (en) * | 2009-07-13 | 2011-02-03 | Isuzu Motors Ltd | Exhaust emission control device for automobile |
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