JPH02215914A - Metal pellet type catalyst - Google Patents
Metal pellet type catalystInfo
- Publication number
- JPH02215914A JPH02215914A JP3464189A JP3464189A JPH02215914A JP H02215914 A JPH02215914 A JP H02215914A JP 3464189 A JP3464189 A JP 3464189A JP 3464189 A JP3464189 A JP 3464189A JP H02215914 A JPH02215914 A JP H02215914A
- Authority
- JP
- Japan
- Prior art keywords
- pellet
- metal
- catalyst
- powder
- type catalyst
- 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
- 239000008188 pellet Substances 0.000 title claims abstract description 61
- 239000003054 catalyst Substances 0.000 title claims abstract description 37
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 36
- 239000002184 metal Substances 0.000 title claims abstract description 36
- 239000000843 powder Substances 0.000 claims abstract description 15
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 6
- 239000010935 stainless steel Substances 0.000 claims abstract description 6
- 239000010970 precious metal Substances 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims description 4
- 230000003197 catalytic effect Effects 0.000 abstract description 11
- 238000005299 abrasion Methods 0.000 abstract description 5
- 229910000510 noble metal Inorganic materials 0.000 abstract description 4
- 238000005245 sintering Methods 0.000 abstract description 3
- 239000004411 aluminium Substances 0.000 abstract 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002002 slurry Substances 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
- F01N3/2832—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support granular, e.g. pellets
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、自動車の排気ガス浄化装置に用いられるペレ
ット型触媒の性能および耐久性を向上できるようにした
メタルペレット型触媒に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a metal pellet type catalyst that can improve the performance and durability of a pellet type catalyst used in an automobile exhaust gas purification device.
従来、自動車の排気ガス浄化装置には、球状に成形され
たγ−アルミナなどの活性アルミナの表面層に白金など
の触媒貴金属を含浸担持させたペレット型触媒が使用さ
れており、例えば実開昭５５−１５３８７号公報に示す
ように、上記ペレット型触媒を収容した触媒コンバータ
が提案されている。Conventionally, automobile exhaust gas purification devices have used pellet-type catalysts in which noble catalytic metals such as platinum are impregnated and supported on the surface layer of activated alumina such as γ-alumina shaped into spheres. As shown in Japanese Patent No. 55-15387, a catalytic converter containing the above-mentioned pellet type catalyst has been proposed.
ところが、上記ペレット型触媒は、触媒コンバータの容
器に比べ熱膨張係数が小さく、温度上昇に伴い容器との
間に隙間が生じてしまうため、使用中に振動によってペ
レット同志、あるいは容器とペレットとが接触して摩滅
したり、α−アルミナ化による表面積と細孔容積の低下
が発生するため、触媒コンバータの背圧が上昇してエン
ジンの出力が低下するなどの問題がある。However, the above pellet type catalyst has a smaller coefficient of thermal expansion than the container of the catalytic converter, and as the temperature rises, a gap is created between the pellets and the container. Abrasion due to contact and a decrease in surface area and pore volume due to α-alumina formation occur, resulting in problems such as an increase in back pressure of the catalytic converter and a decrease in engine output.
そこで最近では、ペレット型触媒に発生する問題点を解
決するために、モノリス型触媒が主流を占めるようにな
っている。Therefore, in order to solve the problems that occur with pellet-type catalysts, monolith-type catalysts have recently become mainstream.
しかしながら、上述したモノリス型触媒は、耐熱性に優
れ、熱膨張係数が小さいので、熱衝撃に強いという特性
を有する反面、整流作用があるので、触媒中を流れる排
気ガスが容易に層流となって、触媒全体が有効に作用し
ないという問題がある。However, the monolithic catalyst described above has excellent heat resistance and a small coefficient of thermal expansion, making it resistant to thermal shock. On the other hand, it has a rectifying effect, so the exhaust gas flowing through the catalyst easily becomes a laminar flow. Therefore, there is a problem that the entire catalyst does not function effectively.
また、モノリス型触媒は、ペレット型触媒に比べて表面
積が小さいので、触媒性能に影響を与えるなどの問題が
ある。Furthermore, since monolithic catalysts have a smaller surface area than pellet-type catalysts, they have problems such as affecting catalyst performance.
本発明は、上述した問題点を課題として提案されたもの
で、ペレット型触媒の特性を活用し、触媒の接触による
摩滅量を低減することによって触媒性能および耐久性を
向上できるようにしたメタルペレット型触媒を提供する
ことを目的とするものである。The present invention was proposed in response to the above-mentioned problems, and utilizes the characteristics of pellet-type catalysts to improve catalyst performance and durability by reducing the amount of abrasion caused by catalyst contact. The purpose is to provide a type catalyst.
この目的を達成するため、本発明では、自動車の排気ガ
ス浄化装置に用いられるペレット型触媒において、鉄粉
またはアルミニウム含有ステンレス粉の金属粉体を焼結
して多孔質のメタルペレット骨格を成形すると共に、上
記メタルペレット骨格にアルミナを含浸させたペレット
担体を形成し、上記ペレット担体の表面に触媒貴金属を
担持させて成形したことを特徴とするものである。To achieve this objective, the present invention involves sintering metal powder such as iron powder or aluminum-containing stainless steel powder to form a porous metal pellet skeleton in a pellet-type catalyst used in automobile exhaust gas purification devices. In addition, the present invention is characterized in that a pellet carrier is formed by impregnating the metal pellet skeleton with alumina, and a catalytic noble metal is supported on the surface of the pellet carrier and then molded.
このような構成では、鉄粉またはアルミニウム含有ステ
ンレス粉等の金属粉体を焼結して多孔質のメタルペレッ
ト骨格を成形すると共に、これにアルミナを含浸させて
ペレット担体を形成し、上記ペレット担体の表面に貴金
属を担持させたメタルペレット型触媒を成形することに
より、上記メタルペレット型触媒を使用した触媒コンバ
ータでは、ペレットの圧壊強度が向上してペレットが割
れるという問題が解消され、触媒コンバータ容器とペレ
ットとの熱膨張係数をほぼ同程度とすることができ、熱
膨張によるペレット相互の接触摩滅が低減され、耐久性
が向上する。In such a configuration, metal powder such as iron powder or aluminum-containing stainless steel powder is sintered to form a porous metal pellet skeleton, and this is impregnated with alumina to form a pellet carrier. By molding a metal pellet type catalyst with precious metals supported on the surface of the catalytic converter container, the crushing strength of the pellets is improved and the problem of pellet cracking is solved in the catalytic converter using the above metal pellet type catalyst. The thermal expansion coefficients of the pellets and the pellets can be made to be approximately the same, reducing contact abrasion between the pellets due to thermal expansion and improving durability.
以下、本発明の実施例を添付した製造工程図に基づいて
詳細に説明する。Hereinafter, embodiments of the present invention will be described in detail based on the attached manufacturing process diagrams.
先ず、鉄粉またはアルミニウム含有ステンレス粉からな
る金属粉体ｌを焼結して、多孔質のメタルペレット骨格
２を成形する。First, metal powder l made of iron powder or aluminum-containing stainless steel powder is sintered to form a porous metal pellet skeleton 2.
次に、上記メタルペレット骨格２を減圧下でγ−アルミ
ナスラリー中に浸漬してメタルペレット骨格２の空隙内
にアルミナ３を含浸させ、ペレット担体４を形成する、
更に、上記ペレット担体４を白金金属などの触媒貴金属
５中に浸漬し、上記ペレット担体４の表面層に触媒貴金
属５を担持させてメタルペレット型触媒Ｂを成形するも
のである。Next, the metal pellet skeleton 2 is immersed in γ-alumina slurry under reduced pressure to impregnate alumina 3 into the voids of the metal pellet skeleton 2 to form a pellet carrier 4. Furthermore, the pellet carrier 4 is coated with platinum. The pellet carrier 4 is immersed in a precious metal catalyst 5 such as a metal, and the precious metal catalyst 5 is supported on the surface layer of the pellet carrier 4 to form a metal pellet type catalyst B.
このように成形されたメタルペレット型触媒６は、触媒
コンバータ容器と同材質の金属粉を焼結したメタルペレ
ット骨格を用いることにより、触媒容器とペレットの熱
膨張係数をほぼ同じにすることができる。The metal pellet type catalyst 6 formed in this manner uses a metal pellet skeleton made of sintered metal powder of the same material as the catalyst converter container, so that the coefficient of thermal expansion of the catalyst container and the pellets can be made almost the same. .
以上説明したように、本発明によるメタルペレット型触
媒は、鉄粉またはアルミニウム含有ステンレス粉等の金
属粉体を焼結して多孔質のメタルペレット骨格を成形し
、これにアルミナを含浸させてペレット担体を形成し、
上記ペレット担体の表面に白金などの触媒貴金属を担持
させたので、ペレットの圧壊強度が向上するため、触媒
コンバータ容器内へのペレット充填時にペレットが割れ
るということがない。As explained above, the metal pellet type catalyst according to the present invention is produced by sintering metal powder such as iron powder or aluminum-containing stainless steel powder to form a porous metal pellet skeleton, and impregnating this with alumina to form pellets. forming a carrier;
Since the catalytic noble metal such as platinum is supported on the surface of the pellet carrier, the crushing strength of the pellets is improved, so that the pellets do not break when being filled into the catalytic converter container.
また、金属を骨格としたペレットであるので、使用時の
摩耗量が少なく耐久性が向上する。Furthermore, since the pellets have a metal skeleton, there is less wear during use, and durability is improved.
さらに、触媒コンバータ容器とペレットとの熱膨張係数
をほぼ同一とすることができるので、温度上昇時に触媒
容器のペレットを抑える力が低下しないため、ペレット
相互の接触摺動によってペレットカ摩滅する現象が生じ
なく、ペレットノ耐久性が向上する。Furthermore, since the thermal expansion coefficients of the catalytic converter container and the pellets can be made almost the same, the force of the catalyst container to suppress the pellets does not decrease when the temperature rises, so that the phenomenon of the pellets being worn away due to contact and sliding between the pellets occurs. This improves the durability of pellets.
添付図面は本発明の実施例を示す製造工程図である。
■・・・金属粉体、２・・・メタルペレット骨格、３・
・・アルミナ、４・・・ペレット担体、５・・・触媒貴
金属、６・・・メタルペレット型触媒。
手続補正書
（方式）
図面の浄書（内容に変更なし）
１、事件の表示
平成０１年 特 許 願
２、発明の名称
メタルベレット型触媒
第０３４６４１号
３、補正をする者
事件との関係 特 許 出願人
東京都新宿区西新宿１丁目７番２号
攻
４゜
代
理
人
６、補正の対象
（１）明細書の［４、図面の簡単な説明」の欄（２）図
面
７、補正の内容
（１）明細書の「４、図面の簡単な説明」の欄の第６頁
第１４〜１５行の「添付図面・・・である。」を、
「第１図は本発明の実施例を示す製造工程図である。」
と補正する。
（２）図面に別紙の通り図番を記入する（内容に変更な
し）。The accompanying drawings are manufacturing process diagrams showing embodiments of the present invention. ■...Metal powder, 2...Metal pellet skeleton, 3.
... Alumina, 4... Pellet carrier, 5... Catalyst noble metal, 6... Metal pellet type catalyst. Procedural amendment (method) Engraving of drawings (no change in content) 1. Indication of the case 1999 Patent application 2. Name of the invention Metal pellet type catalyst No. 034641 3. Person making the amendment Relationship with the case Patent Applicant 1-7-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Attack 4゜ Agent 6, Subject of amendment (1) Column [4. Brief explanation of drawings] of the specification (2) Drawing 7, Contents of amendment (1) In the column ``4. Brief description of the drawings'' of the specification, change ``The attached drawings...'' from lines 14 to 15 on page 6 to ``Figure 1 shows an embodiment of the present invention.'' This is a manufacturing process diagram.
and correct it. (2) Write the drawing number on the drawing as shown in the attached sheet (no change in content).
Claims (1)
において、 鉄粉またはアルミニウム含有ステンレス粉の金属粉体を
焼結して多孔質のメタルペレット骨格を成形すると共に
、上記メタルペレット骨格にアルミナを含浸させたペレ
ット担体を形成し、 上記ペレット担体の表面に触媒貴金属を担持させて成形
したことを特徴とするメタルペレット型触媒。[Claims] In a pellet-type catalyst used in an automobile exhaust gas purification device, metal powder such as iron powder or aluminum-containing stainless steel powder is sintered to form a porous metal pellet skeleton, and the metal pellet is A metal pellet type catalyst characterized in that a pellet carrier having a skeleton impregnated with alumina is formed, and a catalyst precious metal is supported on the surface of the pellet carrier and molded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3464189A JPH02215914A (en) | 1989-02-13 | 1989-02-13 | Metal pellet type catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3464189A JPH02215914A (en) | 1989-02-13 | 1989-02-13 | Metal pellet type catalyst |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02215914A true JPH02215914A (en) | 1990-08-28 |
Family
ID=12420056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3464189A Pending JPH02215914A (en) | 1989-02-13 | 1989-02-13 | Metal pellet type catalyst |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02215914A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7901637B2 (en) | 2005-04-14 | 2011-03-08 | Benteler Automobiltechnik Gmbh | Device for exhaust emission purification for vehicles and production method thereof |
-
1989
- 1989-02-13 JP JP3464189A patent/JPH02215914A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7901637B2 (en) | 2005-04-14 | 2011-03-08 | Benteler Automobiltechnik Gmbh | Device for exhaust emission purification for vehicles and production method thereof |
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