JPH01164444A - Carrier for exhaust gas purification catalyst - Google Patents
Carrier for exhaust gas purification catalystInfo
- Publication number
- JPH01164444A JPH01164444A JP62322586A JP32258687A JPH01164444A JP H01164444 A JPH01164444 A JP H01164444A JP 62322586 A JP62322586 A JP 62322586A JP 32258687 A JP32258687 A JP 32258687A JP H01164444 A JPH01164444 A JP H01164444A
- Authority
- JP
- Japan
- Prior art keywords
- base material
- aluminum
- catalyst
- alkali 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
- 239000003054 catalyst Substances 0.000 title claims abstract description 28
- 238000000746 purification Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 35
- 239000002585 base Substances 0.000 claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000011148 porous material Substances 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 9
- 239000010935 stainless steel Substances 0.000 claims abstract description 9
- 239000011247 coating layer Substances 0.000 claims abstract description 8
- 239000011261 inert gas Substances 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 21
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 12
- 150000001339 alkali metal compounds Chemical class 0.000 claims description 11
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical class [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- WPUINVXKIPAAHK-UHFFFAOYSA-N aluminum;potassium;oxygen(2-) Chemical compound [O-2].[O-2].[Al+3].[K+] WPUINVXKIPAAHK-UHFFFAOYSA-N 0.000 claims 1
- 125000001153 fluoro group Chemical group F* 0.000 claims 1
- 230000006866 deterioration Effects 0.000 abstract description 4
- 238000001354 calcination Methods 0.000 abstract 2
- 230000032798 delamination Effects 0.000 abstract 1
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 description 48
- 239000002184 metal Substances 0.000 description 48
- 239000010410 layer Substances 0.000 description 31
- -1 aluminum compound Chemical class 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- 239000000969 carrier Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- RAWGYCTZEBNSTP-UHFFFAOYSA-N aluminum potassium Chemical compound [Al].[K] RAWGYCTZEBNSTP-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229940051841 polyoxyethylene ether Drugs 0.000 description 1
- 229920000056 polyoxyethylene ether Polymers 0.000 description 1
- 150000003112 potassium compounds Chemical class 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、内燃機関の排気ガス、特に自動車排気ガスの
有害成分を浄化する触媒に用いられるメタルハニカム担
体に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a metal honeycomb carrier used in a catalyst for purifying harmful components of internal combustion engine exhaust gas, particularly automobile exhaust gas.
内燃機関の排気ガスの浄化用触媒は、数多（提案されて
おり、かかる触媒に用いられる担体はセラミック担体が
主流を占めている。A large number of catalysts for purifying exhaust gas from internal combustion engines have been proposed, and ceramic carriers are the predominant carrier used in such catalysts.
然し、近年金属を基質とする基材と、該基材の表面にア
ルミニウム化合物を設けた層に、アルミナ等の多孔質材
のウォッシュコート層を形成し、このコート層に貴金属
成分を担持させてメタルハニカム担体触媒として用いる
ようになってきた。However, in recent years, a wash coat layer of porous material such as alumina has been formed on a base material made of metal and a layer with an aluminum compound on the surface of the base material, and this coat layer is made to carry noble metal components. It has come to be used as a metal honeycomb carrier catalyst.
例えば、特公昭５１−４７１５７号公報には、鉄を主成
分とする金属基材の表面部に、鉄・アルミニウム化合物
を主体とする粗面層を形成する触媒担体が開示されてお
り、又、特公昭５７−３４１８号公報にはステンレス鋼
又は耐熱鋼から成る金属基材の表面部に基材との密着性
が高く高温で安定な粗面を有する中間層を形成させた触
媒担体が開示されている。For example, Japanese Patent Publication No. 51-47157 discloses a catalyst carrier that forms a rough layer mainly composed of an iron-aluminum compound on the surface of a metal base material mainly composed of iron, and Japanese Patent Publication No. 57-3418 discloses a catalyst carrier in which an intermediate layer having a rough surface that has high adhesion to the base material and is stable at high temperatures is formed on the surface of a metal base material made of stainless steel or heat-resistant steel. ing.
〔発明が解決しようとする問題点］
然し乍ら、このような従来の排気ガス浄化用触媒担体に
あっては、金属を基材とした触媒担体基材の表面に鉄・
アルミニウム化合物とアルミナ等の多孔質材であるウォ
ッシュコート層を付着させたものでは、コート層の密着
性が不十分であるため、触媒金属成分が担持されたウォ
ッシュコート層は、熱衝撃及び機械的振動に弱く、剥離
が起こり、使用中に粉化して、通気抵抗の増大、浄化性
能の劣化が著しく起こるという問題点があった。[Problems to be Solved by the Invention] However, in such conventional catalyst carriers for exhaust gas purification, iron or iron is deposited on the surface of the metal-based catalyst carrier base material.
When a wash coat layer made of a porous material such as aluminum compound and alumina is attached, the adhesion of the coat layer is insufficient, so the wash coat layer supporting the catalyst metal component is susceptible to thermal shock and mechanical There have been problems in that it is sensitive to vibrations, peels off, and becomes powder during use, resulting in an increase in ventilation resistance and a significant deterioration in purification performance.
そこで、本発明者は、金属基材及びウォッシュコート層
との密着性の良好な材料を種々研究の結果、金属基材に
アルミニウム・アルカリ金属化合物の皮膜を形成するこ
とによって解決出来ることを見出した。The inventor of the present invention has conducted various studies on materials that have good adhesion to the metal base material and the washcoat layer, and has found that the problem can be solved by forming a film of an aluminum/alkali metal compound on the metal base material. .
このアルミニウム・アルカリ金属化合物は、金属基材と
の密着性が極めて良好であり、この皮膜を特定の厚さと
しこの上にウォッシュコート層を形成すると、特に触媒
として使用する際のコート層の剥離を未然に防止し得る
ことが確認された。This aluminum alkali metal compound has extremely good adhesion to metal substrates, and if this film is made to a certain thickness and a wash coat layer is formed on it, it will prevent the coat layer from peeling off, especially when used as a catalyst. It has been confirmed that this can be prevented.
然し、このアルミニウム・アルカリ金属化合物皮膜を金
属基材の上に形成させる場合、６００〜６５０℃で焼成
するため、金属基材を劣化させ、ウォッシュコート層の
剥離が起こり、浄化性能の劣化が゛起こるという問題点
がある。However, when this aluminum/alkali metal compound film is formed on a metal base material, it is fired at 600 to 650°C, which deteriorates the metal base material and causes the washcoat layer to peel off, resulting in deterioration of purification performance. There are problems that occur.
〔発明の目的］
本発明は斯かる従来の問題点を解決するために為された
もので、その目的は、金属基材の劣化を防止すると共に
、ウォッシュコート層の剥離を防止し、以て浄化性能の
向上を計ることが出来る排気ガス浄化用触媒担体を提供
することにある。[Object of the Invention] The present invention was made to solve the conventional problems, and its purpose is to prevent the deterioration of the metal base material, prevent the peeling of the wash coat layer, and thereby An object of the present invention is to provide a catalyst carrier for exhaust gas purification that can improve purification performance.
〔問題点を解決するための手段］
本発明に係る排気ガス浄化用触媒担体は、ステンレス鋼
又は耐熱鋼から成る基材で形成された平板と波板とを交
互に巻回して成る排気ガス浄化用触媒担体に於て、上記
平板と波板とが、ステンレス鋼又は耐熱鋼から成る基材
の表面部にアルミニウム・アルカリ金属化合物を一２０
℃以下の不活性ガス雰囲気中で焼成して、２〜５μｍの
厚さを有するアルミニウム・アルカリ金属化合物皮膜を
備えると共に、このアルミニウム・アルカリ金属化合物
皮膜の表面にアルミナ系の多孔質材から成るコート層を
備えて成るものである。[Means for Solving the Problems] The catalyst carrier for exhaust gas purification according to the present invention is an exhaust gas purification catalyst carrier made by alternately winding flat plates and corrugated plates made of a base material made of stainless steel or heat-resistant steel. In the catalyst carrier for use, the flat plate and the corrugated plate are coated with an aluminum alkali metal compound on the surface of the base material made of stainless steel or heat-resistant steel.
It is fired in an inert gas atmosphere at temperatures below ℃ to provide an aluminum/alkali metal compound film having a thickness of 2 to 5 μm, and a coat made of an alumina-based porous material on the surface of this aluminum/alkali metal compound film. It consists of layers.
本発明に於て、メタルハニカム担体の金属基材としては
、フェライト系、オーステナイト系及びマルテンサイト
系等のステンレス鋼又は耐熱鋼を使用する。金属基材の
形態及び形状は、本メタルハニカム担体の使用形態によ
って仮、線状等任意の形状とすることが出来、又、その
製造方法も特に制限はない。In the present invention, as the metal base material of the metal honeycomb carrier, ferritic, austenitic, martensitic stainless steel or heat-resistant steel is used. The form and shape of the metal base material can be any shape, such as temporary or linear, depending on the usage form of the metal honeycomb carrier, and there are no particular restrictions on the method of manufacturing it.
アルミナ等の多孔質材であるウォッシュコートは公知の
手段、例えば、浸漬法、スプレー法等によって、メタル
ハニカム担体の金属基材にコート層を形成させる。Washcoat, which is a porous material such as alumina, is formed by forming a coating layer on the metal base material of the metal honeycomb carrier by a known method, such as a dipping method or a spraying method.
メタルハニカム担体は、上記の金属基材とウォッシュコ
ート層で構成されたものであるが、本発明のメタルハニ
カム担体は、金属基材とウォッシュコート層との間に中
間層を設け、中間層を介在として金属基材とウォッシュ
コート層の密着性を強固にしたものである。The metal honeycomb carrier is composed of the above-mentioned metal base material and the washcoat layer, but the metal honeycomb carrier of the present invention has an intermediate layer between the metal base material and the washcoat layer, and the intermediate layer is As an intervening material, the adhesion between the metal base material and the washcoat layer is strengthened.
中間層としては、（１）金属基材との機械的及び熱的に
よる剥離がないこと。（２）ウォッシュコート層との接
着性が良好であること。（３）耐酸化、耐還元。As for the intermediate layer, (1) there should be no mechanical or thermal peeling from the metal base material; (2) Good adhesion to the washcoat layer. (3) Oxidation and reduction resistance.
熱的安定、耐食性であることを必要とする。Requires thermal stability and corrosion resistance.
この様な要件を有する中間層及びその製造方法について
、種々検討の結果、金属基材の表面部にアルミニウム・
アルカリ金属化合物を一２０℃以下の不活性ガス雰囲気
中で焼成して、２〜５μｍの厚さを有するアルミニウム
・アルカリ金属化合物皮膜を形成すると、上述した如き
条件を満足することを確認した。As a result of various studies regarding the intermediate layer and its manufacturing method that meet these requirements, we have found that aluminum is added to the surface of the metal base material.
It has been confirmed that the above-mentioned conditions are satisfied when an alkali metal compound is fired in an inert gas atmosphere at a temperature of -20 DEG C. or lower to form an aluminum/alkali metal compound film having a thickness of 2 to 5 .mu.m.
此処で、アルミニウム・アルカリ金属化合物としては、
例えば、フルオロ・アルミン酸カリウム錯体（ＫＡ Ｉ
！、Ｐ４ ＋ Ｋ：ｌＡ １． Ｐｂ共品体、ＫｚＡ
Ｉ！、Ｆｓ ＋ ＫＪ ｌ。Here, as an aluminum alkali metal compound,
For example, potassium fluoroaluminate complex (KA I
! , P4 + K:lA 1. Pb co-product, KzA
I! , Fs + KJ l.
Ｆ６共晶体等）或いはフルオロ・アルミン酸ナトリウム
錯体（ＮａＡ １． Ｆ ａ ＋ Ｎａ：ｌＡ Ｉ Ｆ
ｂ共品体等）がある。F6 eutectic etc.) or fluoro-sodium aluminate complex (NaA 1.F a + Na:lA I F
b).
上述のようにして得られた本発明の一例に係るメタルハ
ニカム担体を第１図に示す。第２図はメタルハニカム担
体１の担持層の一部を拡大して示す図で、金属基材２上
にアルミニウム・カリウム化合物皮膜３が中間層として
存在し、この上がアルミナコートＮ４で被覆されている
。FIG. 1 shows a metal honeycomb carrier according to an example of the present invention obtained as described above. FIG. 2 is an enlarged view of a part of the support layer of the metal honeycomb carrier 1, in which an aluminum-potassium compound film 3 exists as an intermediate layer on the metal base material 2, and this is coated with alumina coat N4. ing.
本発明の一例に係るメタルハニカム担体には、良く知ら
れている方法により触媒金属が担持され触媒として用い
られる。例えば、自動車の内燃機関のような内燃機関等
から排出される排気ガス浄化用触媒として用いられる場
合には、白金、パラジウム、ロジウム等の貴金属触媒金
属が担持され、耐衝撃性、耐久性等の優れた触媒が得ら
れる〔発明の実施例］
以下、本発明を次の実施例及び比較例により説明する。A metal honeycomb carrier according to an example of the present invention supports a catalytic metal by a well-known method and is used as a catalyst. For example, when used as a catalyst for purifying exhaust gas emitted from internal combustion engines such as automobile internal combustion engines, noble catalyst metals such as platinum, palladium, and rhodium are supported, resulting in improved impact resistance, durability, etc. [Examples of the Invention] Excellent Catalysts Are Obtained [Examples of the Invention] The present invention will be explained below with reference to the following Examples and Comparative Examples.
実施例１，２
メタルハニカム担体の金属基材として、０．０５ｎ＋Ｉ
１１の厚さ、１１０ ｍｍの巾を有する２０Ｃｒ−５Ａ
ｌフエライト系ステンレスの平条コイルを一辺の長さが
２ 、５ ｍｍの正三角形溝を有する波付ローラを通過
させて波形に成形した波形コイルと同質の平板コイルを
重ね合わせて巻取機に掛け、外径寸法が１００ｍｍの丸
型構造体のメタルハニカム担体を作成した。Examples 1 and 2 As the metal base material of the metal honeycomb carrier, 0.05n+I
20Cr-5A with thickness of 11 and width of 110 mm
l A flat coil of ferrite stainless steel is passed through a corrugated roller having an equilateral triangular groove with a side length of 2.5 mm to form a corrugated coil.A corrugated coil and a flat plate coil of the same quality are superimposed and placed on a winding machine. A metal honeycomb carrier having a round structure with an outer diameter of 100 mm was prepared.
次に、２重量％のフルオロ・アルミン酸カリ゛ウム錯体
（例えば、ＫＡｆｆｉＦｎ＋Ｋｓ八ｆｆ１Ｆ、共晶体へ
のスラリー溶液（以下、ＦＡＸ溶液と称す）を作り、こ
のＦＡＫ溶液中に上記メタルハニカム担体を約１５秒〜
３０秒浸漬し、その後、１５０℃熱風炉中で１５分乾燥
した（尚、ＦＡＫ溶液中の懸濁物質を均一に分散させる
のに、溶媒としてアルコール又は非イオン界面活性剤、
例えばアルキルポリオキシエチレンエーテル形を少量加
え調整すると良い。）次いで、アルミナの含有率力筒５
重量％のアルミナシルア００ｇと硝酸アルミニウムを３
５重四％含む水溶液１５０ｇと蒸留水４００ｍｆを加え
、更にα−アルミナ粉末１０００ ｇを加えて撹拌して
スラリーとし、このスラリーを用いてメタルハニカム担
体をウォッシュコートして、コート層を形成した。Next, a slurry solution (hereinafter referred to as FAX solution) of 2% by weight of potassium fluoro-aluminate complex (for example, KAffiFn+Ks8ff1F) to the eutectic is prepared, and the metal honeycomb carrier is placed in this FAK solution. 15 seconds~
It was immersed for 30 seconds, and then dried in a hot air oven at 150°C for 15 minutes.
For example, adjustment may be made by adding a small amount of alkyl polyoxyethylene ether. ) Next, the content ratio of alumina 5
Weight% of alumina silua 00g and aluminum nitrate 3
150 g of an aqueous solution containing 5% by weight and 400 mf of distilled water were added, and 1000 g of α-alumina powder was added and stirred to form a slurry. This slurry was used to wash coat a metal honeycomb carrier to form a coating layer.
その後、実施例１では、Ｎ２ガスで露点−３゜℃とした
電気炉６００″Ｃ〜６５０℃中で焼成し、実施例２では
Ｎ２ガスで露点−２０℃とした電気炉６゜Ｏ′Ｃ〜６５
０℃中で焼成した。Thereafter, in Example 1, firing was performed in an electric furnace 600''C to 650°C with a dew point of -3°C using N2 gas, and in Example 2, firing was performed in an electric furnace 6°O'C with a dew point of -20°C using N2 gas. ~65
It was fired at 0°C.
この焼成したメタルハニカム担体は、基剤表面に中間層
として、約２〜５μｍ程のアルミニウム・カリウム化合
物皮膜を得ることが出来た。この形成した水和物皮膜は
、金属基材との密着性に良好となり、中間層として、金
属基材とコート層との密着性を向上させる橋渡しとなる
。この様にして得たメタルハニカム担体へ、触媒金属と
して白金を常法により担持した。With this fired metal honeycomb carrier, an aluminum/potassium compound film with a thickness of about 2 to 5 μm could be obtained as an intermediate layer on the base surface. The formed hydrate film has good adhesion to the metal base material, and serves as an intermediate layer that serves as a bridge to improve the adhesion between the metal base material and the coating layer. Platinum was supported as a catalyst metal on the metal honeycomb carrier thus obtained by a conventional method.
ル較適上−又一ユ
実施例と同じ方法により、メタルハニカム担体を製造し
た。For comparison, a metal honeycomb carrier was manufactured by the same method as in Example 1.
実施例と同じ組成のＦＡＫ溶液、ウォッシュコート溶液
により、中間層を形成し、その後、比較例１では一１５
℃１比較例２では一１０’ｃ、比較例３では大気雰囲気
中で焼成した。An intermediate layer was formed using a FAK solution and a washcoat solution having the same composition as in the example, and then, in Comparative Example 1,
C. 1 in Comparative Example 2 and 10' C in Comparative Example 3, and in the air atmosphere in Comparative Example 3.
実施例及び比較例１，２．３で製造したメタルハニカム
担体のアルミナ等の多孔質材のヒートサイクル剥離実験
を次の条件で行ない、その結果を第１表及び第３図に示
す。A heat cycle peeling experiment of the porous material such as alumina of the metal honeycomb carrier manufactured in Examples and Comparative Examples 1 and 2.3 was conducted under the following conditions, and the results are shown in Table 1 and FIG. 3.
一ヒートサイクル条件−
８５０℃×２０分＃室温ＸＩＯ分を１サイクルとし、こ
の条件下で５〜３０サイクル実験した。One heat cycle condition - 850° C. x 20 minutes #One cycle was XIO minutes at room temperature, and experiments were conducted for 5 to 30 cycles under these conditions.
以上のように本発明によれば、ステンレス鋼又は耐熱鋼
から成る基材で形成された平板と波板とを交互に巻回し
て成る排気ガス浄化用触媒担体に於て、上記平板と波板
とが、ステンレス鋼又は耐熱鋼から成る基材の表面部に
アルミニウム・アルカリ金属化合物を露点−２０℃以下
の不活性ガス雰囲気中で焼成して、２〜５μｍの厚さを
有するアルミニウム・アルカリ金属化合物皮膜を備える
と共に、このアルミニウム・アルカリ金属化合物皮膜の
表面にアルミナ系の多孔質材から成るコート層を備えて
成るものであるから、従来、メタルハニカム担体に於て
アルミナ等の多孔質材であるウォンシュコート層の剥離
が生じたのに対し、基質からのコート層剥離が未然に防
止され、且つ、製造方法も簡単な為、コスト低減も図る
ことが出来、更には、上記中間層であるアルミニウム・
アルカリ金属皮膜が凹凸を有し、微細な気孔も有する皮
膜であり、又、水濡れ性に優れているため、白金、パラ
ジウム、ロジウム等の貴金属の担持、例えば浸漬含浸法
で実施した場合、貴金属液の浸透が良くなる等の効果が
得られる。As described above, according to the present invention, in the catalyst carrier for exhaust gas purification, which is formed by alternately winding flat plates and corrugated plates formed of a base material made of stainless steel or heat-resistant steel, the flat plate and the corrugated plate are An aluminum alkali metal compound having a thickness of 2 to 5 μm is prepared by baking an aluminum alkali metal compound on the surface of a base material made of stainless steel or heat-resistant steel in an inert gas atmosphere with a dew point of -20°C or less. In addition to having a compound film, a coating layer made of an alumina-based porous material is also provided on the surface of this aluminum/alkali metal compound film. Whereas peeling of the coat layer from the substrate occurred in some cases, the peeling of the coat layer from the substrate was prevented, and the manufacturing method was simple, so costs could be reduced.Furthermore, the intermediate layer described above Some aluminum
Since the alkali metal film has irregularities and fine pores, and has excellent water wettability, it is possible to support noble metals such as platinum, palladium, rhodium, etc., for example, by immersion impregnation. Effects such as improved liquid penetration can be obtained.
第１図は本発明の一例に係るメタルハニカム担体の斜視
図である。
第２図は第１図の担体を正面から見た部分拡大図である
。
第３図は実施例、比較例に於けるメタルハニカム担体の
ヒートサイクル試験結果を示すグラフである。
〔主要な部分の符号の説明］
■・・・メタルハニカム担体
２・・・金属基材
３・・・アルミニウム・カリウム皮膜
４・・・アルミナコート層。FIG. 1 is a perspective view of a metal honeycomb carrier according to an example of the present invention. FIG. 2 is a partially enlarged front view of the carrier shown in FIG. 1. FIG. 3 is a graph showing the heat cycle test results of metal honeycomb carriers in Examples and Comparative Examples. [Description of symbols of main parts] ■...Metal honeycomb carrier 2...Metal base material 3...Aluminum/potassium coating 4...Alumina coat layer.
Claims (2)
た平板と波板とを交互に巻回して成る排気ガス浄化用触
媒担体に於て、上記平板と波板とが、ステンレス鋼又は
耐熱鋼から成る基材の表面部にアルミニウム・アルカリ
金属化合物を−２０℃以下の不活性ガス雰囲気中で焼成
して、２〜５μｍの厚さを有するアルミニウム・アルカ
リ金属化合物皮膜を備えると共に、このアルミニウム・
アルカリ金属化合物皮膜の表面にアルミナ系の多孔質材
から成るコート層を備えて成ることを特徴とする排気ガ
ス浄化用触媒担体。(1) In an exhaust gas purification catalyst carrier formed by alternately winding flat plates and corrugated plates made of a base material made of stainless steel or heat-resistant steel, the flat plates and corrugated plates are made of stainless steel or heat-resistant steel. By baking an aluminum/alkali metal compound in an inert gas atmosphere at -20°C or lower on the surface of a base material made of steel, an aluminum/alkali metal compound film having a thickness of 2 to 5 μm is provided, and this aluminum・
A catalyst carrier for exhaust gas purification, comprising a coating layer made of an alumina-based porous material on the surface of an alkali metal compound film.
・アルミン酸カリウム錯体であることを特徴とする特許
請求の範囲第１項記載の排気ガス浄化用触媒担体。(2) The catalyst carrier for exhaust gas purification according to claim 1, wherein the aluminum/alkali metal compound is a fluoro/potassium aluminate complex.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62322586A JPH01164444A (en) | 1987-12-18 | 1987-12-18 | Carrier for exhaust gas purification catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62322586A JPH01164444A (en) | 1987-12-18 | 1987-12-18 | Carrier for exhaust gas purification catalyst |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01164444A true JPH01164444A (en) | 1989-06-28 |
Family
ID=18145347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62322586A Pending JPH01164444A (en) | 1987-12-18 | 1987-12-18 | Carrier for exhaust gas purification catalyst |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01164444A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0450897A2 (en) * | 1990-04-03 | 1991-10-09 | Ngk Insulators, Ltd. | Heat-resistant metal monolith and manufacturing method therefor |
| JPH07194980A (en) * | 1993-12-10 | 1995-08-01 | Solvay & Cie | Catalyst system containing hydrogenation catalyst on carrier and hydrogen dechlorination method for chlorofluorohydrocarbon |
| KR100435339B1 (en) * | 2001-09-27 | 2004-06-10 | 현대자동차주식회사 | Catalyst of De-NOx for diesel automobile |
-
1987
- 1987-12-18 JP JP62322586A patent/JPH01164444A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0450897A2 (en) * | 1990-04-03 | 1991-10-09 | Ngk Insulators, Ltd. | Heat-resistant metal monolith and manufacturing method therefor |
| AU653713B2 (en) * | 1990-04-03 | 1994-10-13 | Ngk Insulators, Ltd. | Heat-resistant metal monolith and manufacturing method therefor |
| JPH07194980A (en) * | 1993-12-10 | 1995-08-01 | Solvay & Cie | Catalyst system containing hydrogenation catalyst on carrier and hydrogen dechlorination method for chlorofluorohydrocarbon |
| KR100435339B1 (en) * | 2001-09-27 | 2004-06-10 | 현대자동차주식회사 | Catalyst of De-NOx for diesel automobile |
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