JPH0671185A - Metal catalyst carrier excellent in catalyst adhesion and method for its production - Google Patents
Metal catalyst carrier excellent in catalyst adhesion and method for its productionInfo
- Publication number
- JPH0671185A JPH0671185A JP4229701A JP22970192A JPH0671185A JP H0671185 A JPH0671185 A JP H0671185A JP 4229701 A JP4229701 A JP 4229701A JP 22970192 A JP22970192 A JP 22970192A JP H0671185 A JPH0671185 A JP H0671185A
- Authority
- JP
- Japan
- Prior art keywords
- nitrogen
- metal
- catalyst carrier
- metal catalyst
- ppm
- 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.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 40
- 239000002184 metal Substances 0.000 title claims abstract description 40
- 239000003054 catalyst Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 title abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 24
- 239000001301 oxygen Substances 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 239000011888 foil Substances 0.000 claims abstract description 22
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 16
- 239000010935 stainless steel Substances 0.000 claims abstract description 15
- -1 nitrogen- aluminum compound Chemical class 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 21
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 241000264877 Hippospongia communis Species 0.000 claims 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 14
- 239000000463 material Substances 0.000 abstract description 4
- 230000003197 catalytic effect Effects 0.000 abstract description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000112 cooling gas Substances 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 238000005121 nitriding Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241001663154 Electron Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000000746 purification Methods 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
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
Landscapes
- Catalysts (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は自動車排ガス浄化装置用
の触媒コンバーター等で用いられる金属触媒担体に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal catalyst carrier used in a catalytic converter for an automobile exhaust gas purification apparatus.
【０００２】[0002]
【従来の技術】従来、この種の触媒コンバーターは、特
開昭５７−７１８９８号公報等によって開示されている
ように、アルミニウムを含むフェライト系ステンレス鋼
合金からなる素材表面に、耐スポーリング性を向上させ
るため、アルミニウム拡散によりアルミナウイスカ層を
形成させている。このアルミナウイスカ層はα−アルミ
ナである。さらにアルミナウイスカ層の上に白金やロジ
ウム等の金属触媒を含浸させたウォッシュコート層が形
成されており、このウォッシュコート層が触媒反応の媒
体となるものである。ここでウォッシュコート層には、
例えばγ−アルミナが用いられる。2. Description of the Related Art Conventionally, as disclosed in JP-A-57-71898, this type of catalytic converter has a spalling resistance on the surface of a material made of a ferritic stainless steel alloy containing aluminum. In order to improve, an alumina whisker layer is formed by aluminum diffusion. This alumina whisker layer is α-alumina. Further, a washcoat layer in which a metal catalyst such as platinum or rhodium is impregnated is formed on the alumina whisker layer, and this washcoat layer serves as a medium for the catalytic reaction. Here, in the washcoat layer,
For example, γ-alumina is used.
【０００３】上記のような金属触媒担体のアルミニウム
ウイスカ層はウォッシュコート層の付着性の向上を図る
ため、アンカー効果を表面に持たす狙いで針状酸化物の
形態をしている。しかしながら、このアルミナウイスカ
層はアンカー効果を持たせるのに十分な大きさに成長さ
せるためには長時間の酸化加熱処理を行う必要があり、
成長した酸化物は剥離し易いものであるため取扱いが非
常に難しいものである。The aluminum whisker layer of the metal catalyst carrier as described above is in the form of an acicular oxide for the purpose of providing an anchor effect on the surface in order to improve the adhesion of the washcoat layer. However, in order to grow the alumina whisker layer to a size large enough to have an anchor effect, it is necessary to carry out oxidation heat treatment for a long time,
The grown oxide is easy to peel off, and is very difficult to handle.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、従来のアル
ミナウイスカ層形成処理によりウォッシュコート層の付
着性の向上を図る方法とは異なる方法により、ウォッシ
ュ層の密着性を向上させたメタル触媒担体およびその製
造方法を提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention provides a metal catalyst carrier having improved wash layer adhesion by a method different from the conventional method for improving the adhesion of the wash coat layer by the alumina whisker layer forming treatment. And a method for manufacturing the same.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記目的のた
めに成分および熱処理の条件を検討した結果構成された
もので、その要旨とするところは以下のとおりである。
すなわち、 （１）Ａｌ含有ステンレス鋼製の平らな箔と波付け加工
した箔を交互に重ね合わせ、これらを多重に巻いた金属
ハニカムとこれらを囲む金属外筒からなるメタル触媒担
体において、前記箔の両表面が窒素−アルミニウムの化
合物を含有する皮膜で被覆されていること。 （２）（１）記載の皮膜中の窒素濃度の最高値が１０原
子％以上であること。 （３）（１）記載のＡｌ含有ステンレス鋼製の箔が重量
％でＣｒ：１０〜４０wt％、Ａｌ：１〜１０wt％を含有
し、残部がＦｅと不可避不純物からなる組成であるこ
と。 （４）Ａｌ含有ステンレス鋼製の平らな箔と波付け加工
した箔を交互に巻き込んだ金属ハニカムを金属外筒内に
装填してメタル触媒担体を形成した後、続いて酸素濃度
が１００ppm 以下の窒素ガスの加熱雰囲気ガス中で８０
０℃〜１３００℃に加熱し、続いて冷却を行うこと。 （５）（４）記載の加熱雰囲気ガスが （Ａ）酸素濃度が１００ppm 以下の窒素と水素の混合ガ
ス （Ｂ）酸素濃度が１００ppm 以下の窒素とアルゴンの混
合ガスのいずれかであること。 （６）Ａｌ含有ステンレス鋼製の平らな箔と波付け加工
した箔を交互に重ね合わせ、これらを多重に巻いた金属
ハニカムとこれらを囲む金属外筒からなるメタル触媒担
体の製造において、０．１torr以下の減圧下で８００℃
〜１３００℃で加熱処理を行い、続いて （Ａ）酸素濃度が１００ppm 以下の窒素ガス （Ｂ）酸素濃度が１００ppm 以下の窒素と水素の混合ガ
ス （Ｃ）酸素濃度が１００ppm 以下の窒素とアルゴンの混
合ガスのいずれかの雰囲気ガス中で冷却すること。 （７）（４）あるいは（６）に記載のＡｌ含有ステンレ
ス鋼製の箔が重量％でＣｒ：１０〜４０wt％、Ａｌ：１
〜１０wt％を含有し、残部がＦｅと不可避不純物からな
る組成であること。The present invention has been constructed as a result of examining the components and the conditions of heat treatment for the above purpose, and the gist thereof is as follows.
That is, (1) a metal catalyst carrier composed of a metal honeycomb in which Al-containing stainless steel flat foils and corrugated foils are alternately laminated and wound in multiple layers, and a metal outer cylinder surrounding these, Both surfaces of are coated with a film containing a nitrogen-aluminum compound. (2) The maximum value of the nitrogen concentration in the film described in (1) is 10 atomic% or more. (3) The Al-containing stainless steel foil according to (1) contains Cr: 10 to 40 wt% and Al: 1 to 10 wt% by weight, and the balance is Fe and inevitable impurities. (4) After loading a metal honeycomb in which a flat foil made of Al-containing stainless steel and a corrugated foil are alternately wound into a metal outer cylinder to form a metal catalyst carrier, subsequently, the oxygen concentration is 100 ppm or less. 80 in a heated atmosphere of nitrogen gas
Heating to 0 ° C to 1300 ° C followed by cooling. (5) The heating atmosphere gas described in (4) is either (A) a mixed gas of nitrogen and hydrogen having an oxygen concentration of 100 ppm or less, and (B) a mixed gas of nitrogen and argon having an oxygen concentration of 100 ppm or less. (6) In the production of a metal catalyst carrier comprising a metal honeycomb in which flat foils made of Al-containing stainless steel and corrugated foils are alternately superposed and wound in multiple layers and a metal outer cylinder surrounding these, 800 ° C under reduced pressure of 1 torr or less
Heat treatment at ~ 1300 ° C, then (A) Nitrogen gas with an oxygen concentration of 100 ppm or less (B) Mixed gas of nitrogen and hydrogen with an oxygen concentration of 100 ppm or less (C) Nitrogen and argon with an oxygen concentration of 100 ppm or less Cool in one of the mixed gas atmospheres. (7) The Al-containing stainless steel foil described in (4) or (6) is Cr: 10 to 40 wt% in weight%, Al: 1
10 to 10 wt% and the balance is Fe and inevitable impurities.
【０００６】[0006]
【作用】本発明のメタル触媒担体およびその製造方法
は、特定量のアルミニウムを含有するステンレス鋼に対
し、熱処理により表面に窒素とアルミニウムの化合物を
含有する皮膜を形成させ、その化合物とウォッシュコー
ト層（γ−アルミナ）との親和性の良さを利用して、ウ
ォッシュコート層の付着性を向上させることを特徴とし
ている。The metal catalyst carrier and the method for producing the same according to the present invention form a film containing a compound of nitrogen and aluminum on the surface of a stainless steel containing a specific amount of aluminum by heat treatment, and the compound and washcoat layer. The adhesiveness of the washcoat layer is improved by utilizing the good affinity with (γ-alumina).
【０００７】本発明の限定理由を以下に説明する。本発
明のメタル触媒担体の箔表面における皮膜とその成分に
ついて説明する。窒素−アルミニウムの化合物はα−ア
ルミナに比べ活性であり、γ−アルミナを付着させる際
に酸化物から窒化物に変化するため、メタル表面とウォ
ッシュコート層との間には強い親和力が生じると考えら
れる。このことから、メタル触媒担体の箔表面は窒素と
アルミニウムの化合物を含む皮膜でなければならない。
また、皮膜中の成分としては窒素、アルミニウム以外に
酸素があるが、酸素とアルミニウムの化合物は窒素−ア
ルミニウムの化合物のような親和性を持たない。そのた
め箔表面の皮膜が十分な親和性を発揮するためには一定
濃度以上の窒素が皮膜中に含有している必要があり、皮
膜中の窒素濃度の最高値を１０原子％以上と定めた。The reasons for limiting the present invention will be described below. The film on the foil surface of the metal catalyst carrier of the present invention and its components will be described. The nitrogen-aluminum compound is more active than α-alumina, and changes from an oxide to a nitride when γ-alumina is attached, so it is considered that a strong affinity is generated between the metal surface and the washcoat layer. To be Therefore, the foil surface of the metal catalyst carrier must be a film containing a compound of nitrogen and aluminum.
In addition to nitrogen and aluminum, oxygen is contained as a component in the film, but the oxygen-aluminum compound does not have the same affinity as the nitrogen-aluminum compound. Therefore, in order for the film on the foil surface to exhibit sufficient affinity, it is necessary for the film to contain at least a certain concentration of nitrogen, and the maximum value of nitrogen concentration in the film was set at 10 atom% or more.
【０００８】本発明のメタル触媒担体は耐食性および耐
酸化性に優れたものでなければならず、Ｃｒは重量％で
１０％以上必要であり、４０％を超えるとその効果が飽
和するばかりでなく、板の靭性が低下し製造性が著しく
困難になる。またＡｌは耐酸化性向上に有効であり、触
媒担持性を向上させる窒素−アルミニウムの化合物を表
面皮膜として形成させるためのＡｌの供給源であるため
重量％として１％以上含有する必要がある。しかしなが
らステンレス鋼中に多くのＡｌを含有させることは、鋼
の靭性を低下させ冷間圧延等の塑性加工性に悪影響をお
よぼすため、上限として１０％と定めた。The metal catalyst carrier of the present invention must have excellent corrosion resistance and oxidation resistance, and Cr must be 10% by weight or more. If it exceeds 40%, not only the effect is saturated. However, the toughness of the plate is lowered and the productivity becomes extremely difficult. Further, Al is effective for improving the oxidation resistance and is a source of Al for forming a nitrogen-aluminum compound for improving the catalyst-supporting property as a surface film, so it is necessary to contain 1% by weight or more. However, if a large amount of Al is contained in the stainless steel, the toughness of the steel is reduced and the plastic workability such as cold rolling is adversely affected. Therefore, the upper limit was set to 10%.
【０００９】表面の皮膜が窒素−アルミニウムの化合物
からなるステンレス鋼箔の製造方法は過去において研究
されていない技術である。これはＡｌは酸化アルミニウ
ム（アルミナ）の状態が非常に安定であるため、大気
（窒素約７９vol.％、酸素約２１vol.％）中での加熱や
気密性の良くない容器による窒素ガス中での加熱で酸化
しただけでは酸化物のみが生成され窒化物は全く生成さ
れないことから工業的にはあまり注目されなかったため
である。本発明者らはこのようなステンレス鋼箔の製造
方法として、酸化を極力防止しながら窒化を促進させる
熱処理の観点から研究を行い最適な方法および条件を見
出した。A method for producing a stainless steel foil whose surface film is composed of a nitrogen-aluminum compound is a technique that has not been studied in the past. This is because Al is in a very stable state as aluminum oxide (alumina), so heating in air (about 79 vol.% Nitrogen, about 21 vol.% Oxygen) or nitrogen gas in a container with poor airtightness This is because the oxide was not produced at all because only the oxide was produced and the nitride was not produced at all by only oxidizing it by heating. As a method for producing such a stainless steel foil, the present inventors have conducted research from the viewpoint of heat treatment that promotes nitriding while preventing oxidation as much as possible, and has found the optimum method and conditions.
【００１０】本発明の熱処理雰囲気としては窒素−アル
ミニウムの化合物を生成させるために窒素ガス中で行わ
れなければならない。更に酸化を抑制するため窒素ガス
の酸素成分は酸素濃度で１００ppm 以下でなければなら
ない。またこの時の雰囲気ガスとして窒素ガス以外に水
素と窒素の混合ガスを用いた場合水素がＣｒ，Ａｌの酸
化を著しく抑制することから、窒素−アルミニウムの化
合物生成に効果的であった。但しこの場合も酸素濃度は
１００ppm 以下でなければならない。不活性ガスと窒素
ガスの混合ガスを用いた場合でも酸素濃度を１００ppm
以下に制御しておけば同様の効果を持つ。不活性ガスと
してはヘリウム、ネオン、アルゴン等があるが、工業的
に用いる場合コスト的に有利なアルゴンを採用した。The heat treatment atmosphere of the present invention must be performed in nitrogen gas in order to form a nitrogen-aluminum compound. Furthermore, in order to suppress oxidation, the oxygen component of nitrogen gas must be 100 ppm or less in oxygen concentration. Further, when a mixed gas of hydrogen and nitrogen other than nitrogen gas was used as the atmosphere gas at this time, hydrogen remarkably suppressed the oxidation of Cr and Al, and thus it was effective in forming a nitrogen-aluminum compound. However, in this case as well, the oxygen concentration must be 100 ppm or less. Even when using a mixed gas of inert gas and nitrogen gas, the oxygen concentration is 100 ppm.
The same effect can be obtained if controlled below. Examples of the inert gas include helium, neon, argon, etc., but when industrially used, argon was used because of its cost advantage.
【００１１】また、減圧下で一定温度まで加熱を行い窒
素ガスで冷却を行う方法も有効である。これは、酸化を
抑制しながら加熱された状態から窒素冷却中に一挙に窒
素−アルミニウムの化合物を生成させるもので本発明の
皮膜生成方法としては効果的である。Further, a method of heating to a constant temperature under reduced pressure and cooling with nitrogen gas is also effective. This is a method of generating a nitrogen-aluminum compound all at once during cooling of nitrogen from a heated state while suppressing oxidation, and is effective as a film forming method of the present invention.
【００１２】この時加熱は０．１torr以下で行う必要が
あり、０．１torrを超えると残留酸素のために酸化が起
こり、冷却中に窒化が起こり難くなる。一方、減圧を行
う前に予め窒素、不活性ガス等で置換した後に減圧を行
えば多少高い圧力下でも酸化が起き難くなる。At this time, it is necessary to perform heating at 0.1 torr or less, and if it exceeds 0.1 torr, oxidation occurs due to residual oxygen and nitriding does not easily occur during cooling. On the other hand, if the pressure is reduced after substituting with nitrogen, an inert gas or the like before the pressure is reduced, the oxidation hardly occurs even under a slightly high pressure.
【００１３】冷却ガスは窒素−アルミニウムの化合物を
生成させる目的から、窒素を含むガスであり、酸素濃度
が低いものでなければならず、従って、雰囲気ガスとし
ては窒素ガス、窒素と水素の混合ガス、窒素とアルゴン
の混合ガスのいずれかであり、酸素濃度としては１００
ppm 以下でなければならない。For the purpose of producing a nitrogen-aluminum compound, the cooling gas must be a gas containing nitrogen and having a low oxygen concentration. Therefore, the atmosphere gas is nitrogen gas or a mixed gas of nitrogen and hydrogen. , A mixed gas of nitrogen and argon, with an oxygen concentration of 100
Must be below ppm.
【００１４】熱処理温度は化合物の生成に大きく寄与し
ており、低過ぎると反応が遅く本発明の窒素−アルミニ
ウムの化合物を含む皮膜が生成されない。即ち、反応が
十分進行する温度としては８００℃以上必要である。ま
た温度が余り高いと材料強度が極端に低下し成形した金
属ハニカムの形が崩れてしまうため上限は１３００℃で
ある。The heat treatment temperature greatly contributes to the formation of the compound. If it is too low, the reaction is slow and the film containing the nitrogen-aluminum compound of the present invention is not formed. That is, the temperature at which the reaction proceeds sufficiently needs to be 800 ° C. or higher. On the other hand, if the temperature is too high, the material strength will be extremely reduced and the shape of the formed metal honeycomb will be destroyed, so the upper limit is 1300 ° C.
【００１５】[0015]
【実施例】表１に本発明例および表２に比較例を示す。
合金系としてＣｒ，Ａｌの成分を記載しており残部はＦ
ｅと不可避不純物からなっている。加熱処理条件として
は雰囲気ガスの主成分と酸素濃度および加熱温度を記し
ており、減圧下の熱処理の場合（本発明例No．１１〜１
５、比較例No．２３〜２５）は真空度を記載している。
減圧下加熱では冷却条件として冷却ガスの成分、酸素濃
度を示しており、他は加熱雰囲気ガスで冷却を行ってい
る。皮膜中の窒素濃度はＡＥＳ（Auger ele-ctron spec
troscopy) 装置を用いて測定しており、例えば本発明例
No．４とNo．１１の材料についてＡＥＳの深さ方向分析
結果を図１，図２に示しているが、この結果からNo．４
の皮膜中の窒素濃度は２５原子％、No．１１は３８原子
％と読み取れる。また比較例No．１９は図３に示すよう
に窒素濃度が７原子％と低い値となっている。ウォッシ
ュコート付着性は付着量および外観を総合的に判断して
決定し、その結果、本発明例No．１〜１８はウォッシュ
コート付着性が良好であり、比較例No．１９〜２６は付
着性が悪い。EXAMPLES Table 1 shows examples of the present invention and Table 2 shows comparative examples.
The alloy system contains Cr and Al components, and the balance is F
e and inevitable impurities. As the heat treatment conditions, the main component of the atmospheric gas, the oxygen concentration, and the heating temperature are described. In the case of heat treatment under reduced pressure (invention examples Nos. 11 to 1).
5, Comparative Example No. 23 to 25) describe the degree of vacuum.
In the heating under reduced pressure, the components of the cooling gas and the oxygen concentration are shown as cooling conditions, and the others are cooled by the heating atmosphere gas. The nitrogen concentration in the coating is AES (Auger ele-ctron spec.
troscopy) device, for example, the present invention example
No. 4 and No. The results of AES analysis in the depth direction for the material of No. 11 are shown in FIGS. 1 and 2. Four
Nitrogen concentration in the film of No. 11 can be read as 38 atom%. Comparative example No. 19, the nitrogen concentration is as low as 7 atomic% as shown in FIG. The washcoat adhesion was determined by comprehensively judging the adhesion amount and appearance, and as a result, the invention example No. Nos. 1 to 18 have good washcoat adhesion, and Comparative Example No. 19 to 26 have poor adhesion.
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【表２】 [Table 2]
【００１８】[0018]
【発明の効果】以上のことから明らかな如く、本発明に
よれば、アルミナウイスカ層を形成させることなく、ウ
ォッシュコート層の付着性を向上させることが可能とな
る。As is apparent from the above, according to the present invention, it is possible to improve the adhesion of the washcoat layer without forming the alumina whisker layer.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明例No．４の熱処理後の表面の皮膜組成を
ＡＥＳによって分析した図である。1 is an example of the present invention. It is the figure which analyzed the film composition of the surface after the heat processing of 4 by AES.
【図２】本発明例No．１１の熱処理後の表面の皮膜組成
をＡＥＳによって分析した図である。FIG. 2 is an example of the present invention. It is the figure which analyzed the film composition of the surface after the heat processing of 11 by AES.
【図３】本発明例No．１９の熱処理後の表面の皮膜組成
をＡＥＳによって分析した図である。FIG. 3 shows an example No. of the present invention. It is the figure which analyzed the film composition of the surface after the heat processing of 19 by AES.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 伊藤 功 東京都千代田区大手町２−６−３ 新日本 製鐵株式会社内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Isao Ito 2-6-3 Otemachi, Chiyoda-ku, Tokyo Shin Nippon Steel Corporation
Claims (7)
付け加工した箔を交互に重ね合わせ、これらを多重に巻
いた金属ハニカムとこれらを囲む金属外筒からなるメタ
ル触媒担体において、前記箔の両表面が窒素−アルミニ
ウムの化合物を含有する皮膜で被覆されていることを特
徴とする触媒付着性に優れたメタル触媒担体。1. A metal catalyst carrier comprising a metal honeycomb in which flat foils made of Al-containing stainless steel and corrugated foils are alternately superposed, and these are wound in multiple layers, and a metal outer cylinder enclosing the metal honeycombs. Both surfaces of are coated with a film containing a nitrogen-aluminum compound, which is a metal catalyst carrier having excellent catalyst adhesion.
以上であることを特徴とする請求項１記載の触媒付着性
に優れたメタル触媒担体。2. The maximum value of nitrogen concentration in the film is 10 atom%.
The metal catalyst carrier according to claim 1, which is excellent in catalyst adhesion.
０〜４０wt％、Ａｌ：１〜１０wt％を含有し、残部がＦ
ｅと不可避不純物からなる組成であることを特徴とする
請求項１記載の触媒付着性に優れたメタル触媒担体。3. A stainless steel foil containing Cr: 1 by weight%.
0-40 wt%, Al: 1-10 wt%, balance F
The metal catalyst carrier according to claim 1, which has a composition comprising e and inevitable impurities.
付け加工した箔を交互に巻き込んだ金属ハニカムを金属
外筒内に装填してメタル触媒担体を形成した後、続いて
酸素濃度が１００ppm 以下の窒素ガスの雰囲気ガス中で
８００℃〜１３００℃に加熱し、続いて冷却を行うこと
を特徴とする触媒付着性に優れたメタル触媒担体の製造
方法。4. A metal honeycomb carrier, in which a flat foil made of Al-containing stainless steel and a corrugated foil are alternately wound, is loaded into a metal outer cylinder to form a metal catalyst carrier, and then the oxygen concentration is 100 ppm. A method for producing a metal catalyst carrier having excellent catalyst adhesion, which comprises heating to 800 ° C. to 1300 ° C. in the following atmosphere of nitrogen gas and then cooling.
ス （Ｂ）酸素濃度が１００ppm 以下の窒素とアルゴンの混
合ガスのいずれかであることを特徴とする請求項４記載
の触媒付着性に優れたメタル触媒担体の製造方法。5. The heating atmosphere gas is any one of (A) a mixed gas of nitrogen and hydrogen having an oxygen concentration of 100 ppm or less, and (B) a mixed gas of nitrogen and argon having an oxygen concentration of 100 ppm or less. Item 5. A method for producing a metal catalyst carrier having excellent catalyst adhesion according to Item 4.
付け加工した箔を交互に重ね合わせ、これらを多重に巻
いた金属ハニカムとこれらを囲む金属外筒からなるメタ
ル触媒担体の製造において、０．１torr以下の減圧下で
８００℃〜１３００℃で加熱処理を行い、続いて （Ａ）酸素濃度が１００ppm 以下の窒素ガス （Ｂ）酸素濃度が１００ppm 以下の窒素と水素の混合ガ
ス （Ｃ）酸素濃度が１００ppm 以下の窒素とアルゴンの混
合ガスのいずれかの雰囲気ガス中で冷却することを特徴
とする触媒付着性に優れたメタル触媒担体の製造方法。6. A method for producing a metal catalyst carrier comprising a metal honeycomb in which flat foils made of Al-containing stainless steel and corrugated foils are alternately stacked and wound in multiple layers, and a metal outer cylinder surrounding these, Heat treatment is performed at 800 ° C to 1300 ° C under a reduced pressure of 0.1 torr or less, and then (A) nitrogen gas having an oxygen concentration of 100 ppm or less (B) a mixed gas of nitrogen and hydrogen having an oxygen concentration of 100 ppm or less (C) A method for producing a metal catalyst carrier having excellent catalyst adhesion, which comprises cooling in an atmosphere gas of a mixed gas of nitrogen and argon having an oxygen concentration of 100 ppm or less.
Ｃｒ：１０〜４０wt％、Ａｌ：１〜１０wt％を含有し、
残部がＦｅと不可避不純物からなる組成であることを特
徴とする請求項４あるいは５記載の触媒付着性に優れた
メタル触媒担体。7. An Al-containing stainless steel foil contains Cr: 10 to 40 wt% and Al: 1 to 10 wt% by weight.
The metal catalyst carrier according to claim 4 or 5, wherein the balance is Fe and inevitable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4229701A JP2815764B2 (en) | 1992-08-28 | 1992-08-28 | Metal catalyst carrier excellent in catalyst adhesion and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4229701A JP2815764B2 (en) | 1992-08-28 | 1992-08-28 | Metal catalyst carrier excellent in catalyst adhesion and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0671185A true JPH0671185A (en) | 1994-03-15 |
| JP2815764B2 JP2815764B2 (en) | 1998-10-27 |
Family
ID=16896348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4229701A Expired - Fee Related JP2815764B2 (en) | 1992-08-28 | 1992-08-28 | Metal catalyst carrier excellent in catalyst adhesion and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2815764B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2542684A2 (en) * | 2010-03-04 | 2013-01-09 | Swift Fuels, LLC | Renewable engine fuel and method of producing same |
| DE112012001175T5 (en) | 2011-03-10 | 2013-12-05 | Kabushiki Kaisha F.C.C. | Catalyst device for exhaust gas purification |
| US9145566B2 (en) | 2007-07-27 | 2015-09-29 | Swift Fuels, Llc | Renewable engine fuel and method of producing same |
-
1992
- 1992-08-28 JP JP4229701A patent/JP2815764B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9145566B2 (en) | 2007-07-27 | 2015-09-29 | Swift Fuels, Llc | Renewable engine fuel and method of producing same |
| EP2542684A2 (en) * | 2010-03-04 | 2013-01-09 | Swift Fuels, LLC | Renewable engine fuel and method of producing same |
| EP2542684A4 (en) * | 2010-03-04 | 2015-02-25 | Swift Fuels Llc | Renewable engine fuel and method of producing same |
| DE112012001175T5 (en) | 2011-03-10 | 2013-12-05 | Kabushiki Kaisha F.C.C. | Catalyst device for exhaust gas purification |
| DE112012001175B4 (en) | 2011-03-10 | 2023-04-20 | Kabushiki Kaisha F.C.C. | Catalyst device for exhaust gas purification |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2815764B2 (en) | 1998-10-27 |
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