JP2005305373A - Honeycomb catalyst and production method therefor - Google Patents

Honeycomb catalyst and production method therefor Download PDF

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JP2005305373A
JP2005305373A JP2004129212A JP2004129212A JP2005305373A JP 2005305373 A JP2005305373 A JP 2005305373A JP 2004129212 A JP2004129212 A JP 2004129212A JP 2004129212 A JP2004129212 A JP 2004129212A JP 2005305373 A JP2005305373 A JP 2005305373A
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catalyst
honeycomb
honeycomb catalyst
flat plate
grooves
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JP4720101B2 (en
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Koji Hoshino
孝二 星野
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Mitsubishi Materials Corp
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    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

Abstract

<P>PROBLEM TO BE SOLVED: To produce a honeycomb catalyst having a high reaction efficiency and so easily producible as to lower the cost and a production method therefor. <P>SOLUTION: The honeycomb catalyst is produced by forming a large number of recessed grooves 2 in a flat sheet 1 made of a foamed metal for forming an uneven shape, packing a catalyst 3 in the projections 2a, and spirally rolling the flat sheet 1 having the uneven surface in a manner that the direction of the grooves 2 is coincident with the axial direction of the rolling. The projections 2a of the foamed metal have a function as a catalyst support and the recessed grooves 2 have a function as gas flow channels. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、触媒の反応効率が良く、且つ、容易に製造可能なハニカム触媒およびその製造方法に関するものである。   The present invention relates to a honeycomb catalyst which has a good reaction efficiency and can be easily manufactured, and a method for manufacturing the honeycomb catalyst.

従来より、触媒担持用のハニカム構造として、波板と平板の２枚を組み合わせたものが用いられており、その設置場所の制約や利用効率の点から円筒状や角形状のものが知られている。円筒状のメタルハニカムとして特許文献１が、角形状のメタルハニカムとして特許文献２が開示されている。   Conventionally, a honeycomb structure for supporting a catalyst is a combination of two corrugated plates and flat plates. Cylindrical and rectangular shapes are known in terms of installation location restrictions and utilization efficiency. Yes. Patent Document 1 is disclosed as a cylindrical metal honeycomb, and Patent Document 2 is disclosed as a square metal honeycomb.

特許文献１の触媒用メタルハニカムは、金属製の波板と平板を重ね合わせた後、螺旋状に巻き付けて構成したものであり、特許文献２の触媒用メタルハニカムは、金属製の波板と平板を交互に積層した積層体を角形の枠体に収納して構成したものである。
特開平１０−２８８７３号公報 特開２００１−２２５１３０号公報 The catalyst metal honeycomb of Patent Document 1 is configured by superimposing a metal corrugated plate and a flat plate and then winding them in a spiral shape. The catalyst metal honeycomb of Patent Document 2 is composed of a metal corrugated plate and A laminate in which flat plates are alternately laminated is housed in a rectangular frame.
JP 10-28873 A JP 2001-225130 A

ところで、特許文献１や特許文献２を含めて、上記のように平板と波板の組み合わせて構成したハニカム構造の触媒担持体では、触媒として使用する際、ハニカム構造体内部を通過するガス流の圧力や外部からの衝撃などによって相互に重ね合わせた平板と波板がずれたりばらけたりするという問題があり、これを防止するため、従来では、両者をスポット溶接やろう付けなどにより接合・固定するようにしていた。或いは、平板と波板の双方に係合機構を設けたり、積層体を収納する枠体にズレ止め用のストッパー機構を設けたりしていた。
従って、作業工数も多く、且つ、製造設備等も複雑化するため、コスト高となっていた。 By the way, including the patent document 1 and the patent document 2, in the catalyst support body of the honeycomb structure configured by combining the flat plate and the corrugated sheet as described above, the gas flow passing through the inside of the honeycomb structure body is used when used as a catalyst. In order to prevent this problem, the plates and corrugated plates that are stacked on top of each other may be displaced or scattered due to pressure or external shocks. To prevent this, conventionally, they are joined and fixed by spot welding or brazing. I was trying to do it. Alternatively, an engagement mechanism is provided on both the flat plate and the corrugated plate, or a stopper mechanism for preventing misalignment is provided on the frame body that houses the laminated body.
Therefore, the number of work steps is large, and the manufacturing equipment and the like are complicated, resulting in high costs.

また、触媒担持体として、しばしば発泡金属が用いられるが、触媒担持の発泡金属はガスの流通性が悪く、通過ガスの圧損が大きくなるという欠点があった。   Further, foam metal is often used as the catalyst carrier, but the catalyst-supported foam metal has the disadvantage that the gas flowability is poor and the pressure loss of the passing gas increases.

本発明は、このような問題点に鑑み成されたもので、触媒の反応効率が良く、且つ、容易に製造可能でコスト低減できるハニカム触媒とその製造方法を提供することを目的としている。   The present invention has been made in view of such problems, and an object of the present invention is to provide a honeycomb catalyst that has a high catalyst reaction efficiency, can be easily manufactured, and can be reduced in cost, and a manufacturing method thereof.

すなわち、請求項１に記載の本発明は、多数の溝を形成した多孔質金属板を渦巻状に巻回して構成したハニカム状の触媒担持体に触媒が担持されていることを特徴としている。   That is, the present invention described in claim 1 is characterized in that the catalyst is supported on a honeycomb-shaped catalyst support formed by spirally winding a porous metal plate having a large number of grooves.

また、請求項２に記載の本発明は、多孔質金属製の平板に多数の溝を設けて凹凸状に形成すると共に、その凸状部分に触媒を充填した後、この凹凸状の平板を溝方向を巻き軸方向として渦巻状に巻回することを特徴としている。   Further, in the present invention according to claim 2, the flat plate made of porous metal is provided with a number of grooves to form a concavo-convex shape, and after the convex portion is filled with a catalyst, the concavo-convex plate is formed into a groove. It is characterized by winding in a spiral shape with the direction as the winding axis direction.

また、請求項３に記載の本発明は、多孔質金属製の平板に触媒を充填した後、多数の溝を設けて凹凸状に形成すると共に、この凹凸状の平板を溝方向を巻き軸方向として渦巻状に巻回することを特徴としている。   According to the third aspect of the present invention, after a porous metal flat plate is filled with a catalyst, a large number of grooves are provided to form a concavo-convex shape. It is characterized by winding as a spiral.

また、請求項４に記載の本発明は、請求項２または請求項３の何れかに記載のハニカム触媒の製造方法において、前記溝が押し潰し加工により形成されることを特徴としている。   Further, according to a fourth aspect of the present invention, in the method for manufacturing a honeycomb catalyst according to the second or third aspect, the groove is formed by a crushing process.

ここで、請求項１に記載のハニカム触媒では、筒状体を構成する多孔質金属板の凸状部分が触媒の担体として機能し、凹状部分（すなわち、溝部）がガス流路として機能する。多孔質金属の空孔に触媒を担持することにより触媒の充填量を多くできると共に、ガス通路となる溝部にガス流の妨げとなる触媒が配置されていないため、背圧が低く良好なガス流通性を有するガス通路を確保することができ、よって、触媒反応が効率良く行われる。
また、請求項２から請求項４に記載のハニカム触媒の製造方法では、製造工程は極めて単純化され容易に製造可能であるから、低コストのハニカム触媒を提供することができる。 Here, in the honeycomb catalyst according to the first aspect, the convex portion of the porous metal plate constituting the cylindrical body functions as a carrier for the catalyst, and the concave portion (that is, the groove portion) functions as a gas flow path. By supporting the catalyst in the pores of the porous metal, the filling amount of the catalyst can be increased, and since the catalyst that hinders the gas flow is not arranged in the groove portion serving as the gas passage, the back pressure is low and the gas flow is good. The gas passage having the property can be secured, and thus the catalytic reaction is efficiently performed.
Further, in the method for manufacturing a honeycomb catalyst according to any one of claims 2 to 4, the manufacturing process is extremely simplified and can be easily manufactured, so that a low-cost honeycomb catalyst can be provided.

以上説明したように、本発明によれば、製造工程は極めて単純化され、ハニカム触媒を容易に製造することができるため、低コストのハニカム触媒を提供することができる。
また、ハニカム触媒担持体は、伝熱性に優れ、且つ、内部には、良好なガス流性が得られるガス通路が確保されているため、反応用の熱を効率良く吸収して触媒反応が効率良く行われる。 As described above, according to the present invention, the manufacturing process is extremely simplified, and the honeycomb catalyst can be easily manufactured. Therefore, a low-cost honeycomb catalyst can be provided.
In addition, since the honeycomb catalyst carrier is excellent in heat transfer and has a gas passage in the inside to obtain good gas flow, the heat for reaction is efficiently absorbed and the catalytic reaction is efficient. Well done.

以下、図面に基づいて本発明の実施形態を説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は本実施形態によるハニカム触媒（例えば、炭化水素改質触媒）の製造工程を示している。
図１（ａ）に示すように、触媒担体の素材となる多孔質金属体として、例えば、Ｎｉ発泡金属で成る横長帯状の角形平板１を用いている。
先ず、図１（ｂ）に示すように、押し潰し加工により、この帯状体の長手方向に縦方向の凹溝２をほぼ等間隔にて多数形成し、凹凸状にする。発泡金属はスポンジ状であるから加工性は良く、押し潰し加工も極めて容易に行え、溝部分は発泡金属内部の空孔が押し潰されて単板状となっている。尚、溝加工は斜めや市松模様等に押し潰しても良い。
次に、図１（ｃ）に示すように、発泡金属の凸状部分２ａに触媒３を充填する。触媒３は、アルミナ粉（例えば、γ−Ａｌ2 Ｏ3 粉 ）にＮｉやＲｕを担持させた粉末を用いることができる。多孔質金属体として上記発泡金属の他、メッシュ、フェルト、エキスパンドメタル等が使用可能であり、何れも、この触媒３の粉末を凸状部分２ａの空孔内部や繊維金属質表面に満遍なく分散した状態で付着・担持させる。これらの多孔質金属体もＮｉで構成するのが好ましい。
次に、図１（ｄ）に示すように、この触媒３を充填した横長帯状の平板１を長手方向に、すなわち、溝２方向（縦方向）を巻き軸方向として渦巻状に巻回し、円筒状のハニカム触媒１０を得る。 FIG. 1 shows a manufacturing process of a honeycomb catalyst (for example, a hydrocarbon reforming catalyst) according to the present embodiment.
As shown in FIG. 1A, for example, a horizontally long strip-shaped rectangular flat plate 1 made of Ni foam metal is used as a porous metal body as a material of the catalyst carrier.
First, as shown in FIG. 1 (b), a number of longitudinal grooves 2 are formed at substantially equal intervals in the longitudinal direction of the band-like body by a crushing process so as to be uneven. Since the foam metal is in the form of a sponge, the workability is good and the crushing process can be performed very easily. The groove portion is formed into a single plate by crushing the voids inside the foam metal. In addition, the groove processing may be crushed obliquely or in a checkered pattern.
Next, as shown in FIG.1 (c), the convex part 2a of a metal foam is filled with the catalyst 3. As shown in FIG. As the catalyst 3, powder in which Ni or Ru is supported on alumina powder (for example, γ-Al 2 O 3 powder) can be used. In addition to the above foam metal, mesh, felt, expanded metal, etc. can be used as the porous metal body. In any case, the powder of the catalyst 3 is evenly dispersed inside the pores of the convex portion 2a and the surface of the fiber metal. Adhere and carry in the state. These porous metal bodies are also preferably made of Ni.
Next, as shown in FIG. 1 (d), the horizontally long strip-shaped flat plate 1 filled with the catalyst 3 is wound in a spiral shape in the longitudinal direction, that is, in the groove 2 direction (longitudinal direction) as the winding axis direction. A honeycomb catalyst 10 is obtained.

このように、本実施形態の製造方法では、従来のようなスポット溶接やろう付け等の煩雑な作業は不要であり、製造工程は極めて単純であるため、ハニカム触媒１０の製造は容易であり、よって、低コストのハニカム触媒１０を提供することができる。   As described above, in the manufacturing method of the present embodiment, conventional work such as spot welding and brazing is not necessary, and the manufacturing process is extremely simple, so that the honeycomb catalyst 10 can be easily manufactured. Therefore, the low-cost honeycomb catalyst 10 can be provided.

また、上記製造方法で得たハニカム触媒１０は、発泡金属製平板１の凸状部分２ａが触媒３の担体として機能しており、これを巻回することにより、前工程の押し潰し加工により形成された凹溝２が縦方向に沿った多数の空洞部を形成し、これら空洞部がガス通路として機能している。   Further, the honeycomb catalyst 10 obtained by the above manufacturing method is formed by the crushing process in the previous step by winding the convex portion 2a of the foamed metal flat plate 1 as a carrier of the catalyst 3 and winding it. The formed concave grooves 2 form a large number of cavities along the vertical direction, and these cavities function as gas passages.

触媒担持体として伝熱性に優れるＮｉ発泡金属を用い、その内部空孔に粉末の触媒３を分散的に満遍なく担持することにより、触媒３の充填量を多くできると共に、ガス流路（凹溝２）にはガスの流れを妨げる触媒３が配置されていないため、ハニカム構造体内に背圧の小さい良好なガス流通性を備えたガス通路を確保することができ、反応用の熱を効率良く吸収して優れた改質能を得ることができる。   By using Ni foam metal having excellent heat conductivity as the catalyst support and supporting the powdered catalyst 3 uniformly in its internal pores in a dispersed manner, the filling amount of the catalyst 3 can be increased and the gas flow path (concave groove 2) can be increased. ) Is not provided with a catalyst 3 that obstructs the gas flow, it is possible to secure a gas passage with good gas flowability with low back pressure in the honeycomb structure, and efficiently absorb the heat for reaction. Thus, an excellent reforming ability can be obtained.

尚、図１の本実施形態では、発泡金属製平板１への触媒３の充填を押し潰し加工後に行うようにしたが、発泡金属製平板１に触媒３を充填した後に押し潰し加工により凹溝２を設けるようにしても構わない。この場合は、潰された溝部分にも触媒３が存在するが、ガスの流通性に影響はなく、良好なガス通路は確保されている。   In the present embodiment shown in FIG. 1, the filling of the catalyst 3 into the metal foam flat plate 1 is performed after the crushing process. 2 may be provided. In this case, although the catalyst 3 exists also in the crushed groove part, there is no influence on the gas flowability and a good gas passage is ensured.

次に、図２、図３は上記した円筒状のハニカム触媒１０を用いて構成した炭化水素改質触媒装置２０の構成例を示している。   Next, FIG. 2 and FIG. 3 show a configuration example of a hydrocarbon reforming catalyst device 20 configured using the above-described cylindrical honeycomb catalyst 10.

図２は、上記構成のハニカム触媒１０を両端を開放した円筒状の管体４に収納したもので、管体４の一端側より燃料ガス（メタンと水蒸気の混合ガス）を導入し、燃料ガスが管内の多数の凹溝２内を下方より上方へ流通する過程で触媒３に接触し、改質反応で生じた水素豊富な改質ガスを管体４の他端より得ることができる。
図３は、図１（ｄ）において、触媒３を充填した平板１を円筒状の内管５に巻き付けたものを円筒状の外管６に収納したもので、内管５による中心孔５ａ内には改質反応のための熱源Ｑが供給されるようになっている。 FIG. 2 shows a honeycomb catalyst 10 having the above-described structure housed in a cylindrical tube 4 with both ends open. A fuel gas (mixed gas of methane and water vapor) is introduced from one end of the tube 4 to thereby produce a fuel gas. However, the hydrogen-rich reformed gas generated in the reforming reaction can be obtained from the other end of the tube body 4 by contacting the catalyst 3 in the process of flowing from the lower side to the upper side in the numerous concave grooves 2 in the tube.
FIG. 3 shows a state in which the flat plate 1 filled with the catalyst 3 in FIG. 1 (d) is wound around a cylindrical inner tube 5 and accommodated in a cylindrical outer tube 6. Is supplied with a heat source Q for the reforming reaction.

これらの改質触媒装置２０は改質能に優れ、且つ安価であり、燃料電池の燃料改質等に用いて好適である。   These reforming catalyst devices 20 are excellent in reforming ability and inexpensive, and are suitable for use in fuel reforming of fuel cells.

本発明に係るハニカム触媒の製造工程を示す図。The figure which shows the manufacturing process of the honeycomb catalyst which concerns on this invention. 本発明のハニカム触媒を用いた炭化水素改質装置の構造を示す斜視図。The perspective view which shows the structure of the hydrocarbon reforming apparatus using the honeycomb catalyst of this invention. 本発明のハニカム触媒を用いた図２とは別の炭化水素改質装置の構造を示す斜視図。The perspective view which shows the structure of the hydrocarbon reformer different from FIG. 2 using the honeycomb catalyst of this invention.

符号の説明Explanation of symbols

１ 平板
２ 凹溝
２ａ 凸状部
３ 触媒
１０ ハニカム触媒 DESCRIPTION OF SYMBOLS 1 Flat plate 2 Concave groove 2a Convex part 3 Catalyst 10 Honeycomb catalyst

Claims (4)

多数の溝を形成した多孔質金属板を渦巻状に巻回して構成したハニカム状の触媒担持体に触媒が担持されていることを特徴とするハニカム触媒。 A honeycomb catalyst, wherein a catalyst is supported on a honeycomb-shaped catalyst support formed by spirally winding a porous metal plate having a large number of grooves. 多孔質金属製の平板に多数の溝を設けて凹凸状に形成すると共に、その凸状部分に触媒を充填した後、この凹凸状の平板を溝方向を巻き軸方向として渦巻状に巻回することを特徴とするハニカム触媒の製造方法。 A number of grooves are provided on a porous metal flat plate to form a concavo-convex shape, and the convex portion is filled with a catalyst, and then the concavo-convex flat plate is wound in a spiral shape with the groove direction as a winding axis direction. A method for manufacturing a honeycomb catalyst. 多孔質金属製の平板に触媒を充填した後、多数の溝を設けて凹凸状に形成すると共に、この凹凸状の平板を溝方向を巻き軸方向として渦巻状に巻回することを特徴とするハニカム触媒の製造方法。 After filling a porous metal flat plate with a catalyst, a plurality of grooves are provided to form an uneven shape, and the uneven flat plate is wound in a spiral shape with the groove direction as a winding axis direction. A method for manufacturing a honeycomb catalyst. 前記溝が押し潰し加工により形成されることを特徴とする請求項２または請求項３の何れかに記載のハニカム触媒の製造方法。 The method for manufacturing a honeycomb catalyst according to any one of claims 2 and 3, wherein the groove is formed by a crushing process.
JP2004129212A 2004-04-26 2004-04-26 Method for manufacturing honeycomb catalyst Expired - Fee Related JP4720101B2 (en)

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