JPH044042A - Production of metal catalyst carrying noble metal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a precious metal-supported metal catalyst in which a precious metal is supported on a metal material having a shape such as a plate, honeycomb, ribbon, ring, net, or line. Relating to a manufacturing method.

[Prior Art] Catalysts supporting precious metals exhibit excellent catalytic activity at low temperatures with respect to various oxidation properties, and therefore have been used to purify various pollutants and bad odors discharged from factories, automobiles, and the like.

Conventionally, this precious metal-supported catalyst has been made by supporting precious metals on microparticles such as alumina wash-coated on a honeycomb-shaped or foam-shaped ceramic carrier having an integral structure, or by supporting precious metals on a ceramic carrier such as spherical or pellet-shaped ceramic carriers. Directly supported materials have been used.

However, none of these ceramic carriers can withstand rapid temperature increases, decreases, or vibrations, resulting in cracks, abrasion, etc., and the formation of voids due to misfires or long-term use, through which exhaust gases can escape. The atrium caused some of the various pollutants and odors to be scattered outside.

Furthermore, ceramic carriers having a monolithic structure, such as honeycomb or foam, become brittle and easily break when used for a long period of time when unburned deposits such as dust are removed from the catalyst by cleaning.

In order to overcome these drawbacks, attention has begun to be paid to metal carriers, which have the advantage of not being damaged by repeated rapid temperature increases and decreases, and unaffected by vibrations, cleaning, etc. In particular, with recent advances in processing technology, the thickness of metal plates has become thinner.
When made into a nicam shape, the wall thickness can be made thinner than that of a ceramic product, which has the advantage of reducing back pressure. For this reason, recently, taking advantage of these advantages, /X Unicam-shaped metal carriers have begun to be used as carriers for automatic military exhaust gas purification catalysts that are constantly exposed to rapid temperature increases and decreases and constantly vibrate. Ta.

[Problem to be Solved by the Present Invention 1] By the way, as a method for supporting noble metals on a ceramic honeycomb carrier, fine particles such as γ-alumina are milled for several hours to more than ten hours to form a slurry, and then the ceramic honeycomb carrier is washed coated. Then, the noble metal is supported by a dipping method, a water absorption method, etc., or the precious metal is supported on fine particles such as γ-alumina by a dipping method, a water absorption method, etc., and then subjected to IJ for several to ten hours. Generally, a method is adopted in which the slurry is made into a slurry and then washed coated on the ceramic honeycomb support. This method was also applied to metal honeycomb carriers;
The manufacturing process was long, leading to high prices. Therefore,
There was a need for a simple and inexpensive manufacturing method.

As a method of supporting precious metals on metals that shortens the manufacturing process, Japanese Patent Application Laid-Open Nos. 113292-1982 and 1982-
No. 159848 discloses an electroplating method. However, as will be described later, the activity of the catalyst prepared by electroplating immediately decreased during the oxidation test, making it unsuitable for practical use.

Furthermore, Japanese Patent Publication No. 51-26913 discloses a dipping method in which a noble metal is directly supported on a metal surface. but,
This method also involves the elution of heavy metals such as chromium that make up the metal, and the pollution prevention treatment is very expensive.
It was unsuitable for industrial manufacturing.

In addition, JP-A-59-123535 discloses a mixed solution in which a fine powder of a noble metal and its ions are made to coexist in an organic solvent such as monoethanolamine or ethylenediamine, and an organic binder such as an aqueous solution of calpitol of ethyl cellulose is added. After being attached to the ceramic honeycomb carrier,
A method for supporting a noble metal catalyst characterized by heating and heat treatment was disclosed, and it was suggested that it could also be applied to a metal honeycomb carrier. However, as will be described later, this method was not suitable for practical use in the case of metal honeycomb because of its large peeling.

In fact, in the case of exhaust gas purification catalysts for factories, cleaning treatment is performed to prevent catalyst activity from decreasing due to adhesion of dust, unburned organic matter, etc., so it was desired that the catalyst would not peel off at that time.

In addition, the metal honeycomb carrier itself has a high price,
It had the disadvantage of being heavy. For example, when comparing the same capacity, the price is 20% lower than that of a general ceramic honeycomb carrier.
~3 times as much, and the weight was almost twice as much with the 400 cell specification. Therefore, there has been a demand for the development of inexpensive and lightweight metal carriers.

As described above, a method for producing a practical, simple and inexpensive noble metal-supported metal catalyst has not yet been found, and a lightweight and inexpensive metal carrier has not yet been found.

In order to spread the use of metal carriers as exhaust gas purification catalysts in factories, automobiles, motorcycles, etc. in the future, there is a need to develop inexpensive and non-peeling precious metal supported metal catalysts. There was also a need to develop carriers.

[Object of the present invention] The object of the present invention is to solve the above-mentioned problems of the prior art and to develop a method for manufacturing a noble metal-supported metal catalyst that is simple, inexpensive, and does not peel off, and to provide an inexpensive and lightweight metal catalyst. The objective is to develop a method for manufacturing the carrier.

[Means for Solving the Problems] As a result of intensive research to solve the above-mentioned problems, the present inventors have developed a compound containing a halogen-free noble metal, a halogen-free refractory metal compound, and an alkyl alcohol. The solution (which may be a suspension) has excellent adhesion to metal materials (metal carriers) having shapes such as plates, honeycombs, ribbons, rings, nets, and lines, and has a high catalytic activity. found that it is an effective material for producing noble metal-supported metal catalysts that can support precious metals in one step.
The present invention has now been completed.

The purpose of the present invention is to provide a solution (suspension) for producing a noble metal-supported metal catalyst in which a precious metal is supported on a metal material having a shape such as a plate, honeycomb, ribbon, ring, net, or line. ) is attached to the metal material,
This is achieved by a method for producing a noble metal-supported metal catalyst, which is characterized by heat-treating the metal material. Further, an object of the present invention is to provide a honeycomb-like shape obtained by rolling the above-mentioned solution (which may be a suspension) over two metal plates, at least one of which is a corrugated plate. This is achieved by a method for producing a noble metal-supported metal catalyst in which a noble metal is supported on a metal material having a ribbon-like shape, which is characterized in that the metal material is adhered to the material and heat-treated, and then the metal material is unraveled and cut into ribbons.

The present invention will be explained in detail below.

The type of noble metal compound used in the present invention is not particularly limited, but examples include palladium, platinum, rhodium, gold, silver,
Examples include compounds such as ruthenium, iridium, and rhenium. However, as will be described later, if the noble metal compound contains halogen, the halogen will corrode the metal carrier itself during heat treatment, so it must be a noble metal compound that does not contain halogen. Examples of halogen-free noble metal compounds include ammine salts, acetates, and nitrates. In the noble metal-supported metal catalyst obtained by the method of the present invention, the noble metal may be used alone or in combination;
can exist as an alloy, oxide, etc. of two or more noble metals.

The amount of noble metal supported may be any amount as long as the necessary catalytic activity is obtained, but in order to maintain good catalytic activity,
Usually, a supported amount of 0.1-109 per 112 catalysts is desirable.

The type of refractory metal compound used in the present invention is not particularly limited. However, for the same reason as above, it must be a refractory metal compound that does not contain halogen. Examples of halogen-free refractory metal compounds include alumina sol,
Examples include aluminum nitrate, silica sol, zirconyl acetate, zirconyl nitrate, titanic acid, and titanium nitrate.

These refractory metals can be present in the noble metal-supported metal catalyst obtained by the present invention as a single substance, or as oxides of two or more refractory metals.

Further, when a refractory metal compound is added to a noble metal compound, it is desirable to match the liquid properties of the refractory metal compound to the liquid properties of the noble metal compound so that precipitation does not occur.

The supported amount of the refractory metal may be any amount as long as the necessary catalytic activity is obtained, but in order to maintain good catalytic activity and prevent peeling, the amount of the refractory metal supported is usually 112
Hit 0. A supported amount of O1 to O52 is desirable.

The type of alkyl alcohol used in the present invention is also not particularly limited. Examples of the alkyl alcohol used in the present invention include methanol, ethanol, propatool, butanol, and the like.

The content of noble metal compounds, refractory metal compounds and alkyl alcohol in the solution (which may also be a suspension) is:
Considering the amount of supported noble metals and refractory metal oxides, the dispersibility of noble metals, and the improvement of adhesion with metal materials, the amount of noble metal compounds is usually 0.5 to 20% by weight in terms of precious metals, and the amount of refractory metals is Compound is 0.05 to IO in terms of refractory metal oxide
It is desirable that the amount of alkyl alcohol is 1 to 50% by weight.

The material of the metal material is not particularly important, but it is often exposed to high temperatures due to usage conditions, so it is desirable to use a material with high heat resistance.
Examples include refractory iron-based alloys (stainless steel, feclaroy, etc.), refractory nickel-based alloys, refractory chromium-based alloys, and the like.

Note that in order to further increase the adhesion with noble metals, the metal material is chemically treated by soaking it in acid etc. before applying the solution (which may be a suspension) disclosed in the present invention. or physically by spraying fine powder such as corundum with compressed air.
It is preferable to thermally treat the metal by exposing it to air at a high temperature of 1200° C. for 30 minutes to 10 hours to make the metal surface uneven.

The method of applying the solution (which may be a suspension) to the metal material is not particularly limited, but for example, the metal material may be immersed in the solution (which may be a suspension), or the solution may be applied with a brush, roller, etc. Apply or spray a solution (suspension may also be used)
Examples include spraying.

The heat treatment temperature after the solution (which may be a suspension) disclosed in the present invention is attached to the metal material is 300 to 800℃.
°C is preferred. At temperatures lower than that, decomposition of noble metal compounds into precious metals is difficult to occur, and at temperatures higher than that, sintering of noble metals tends to occur. The heat treatment time is preferably 5 minutes to 5 hours.

The shape of the metal material is not particularly limited, and examples thereof include a plate shape, a honeycomb shape, a ribbon shape, a ring shape, a net shape, and a wire shape.

Among these, particularly when manufacturing a ribbon-shaped precious metal-supported metal catalyst, it is preferable to first catalyze a honeycomb-shaped metal material and then cut it. Specifically, the metal material is made by winding two metal plates, at least one of which is a corrugated plate, to have a honeycomb shape, and the height of the waves on one of the corrugated plates is 0.5 to 5 mm. ,
The other one is preferably 0 to 0.5 mm. If the height of the waves of the corrugated sheet is smaller than this, it is difficult for air to flow, and if it is too large, the filling amount of the metal material is low, so the amount of ribbon-shaped catalyst obtained after cutting is small.
The advantage of going to the trouble of creating a honeycomb shape disappears. The thickness of the metal plate is preferably 10 to 100 microns. If two metal plates, at least one of which is a corrugated plate, are rolled together to form a single comb shape, it is preferable to wrap a wire or the like around the center to prevent it from unraveling during work.

Further, after the honeycomb-shaped metal material is unraveled into two metal plates, it is desirable to cut the metal material into a width of 1 to 10 mm using a shredder or the like. If it is narrower than this, the metal pieces will be tightly packed and it will be difficult for gas to flow, and if it is wider than this, the gap will be too open and gas will often easily blow out.

When storing the precious metal-supported metal catalyst cut into a ribbon shape into a metal storage case, it is preferable to use a machine such as a press in order to pack the catalyst as uniformly as possible.

Further, the amount of the ribbon-shaped precious metal-supported metal catalyst stored in the storage case may be any amount as long as the necessary catalytic activity is obtained, but in order to maintain good catalytic activity, the filling amount should be 1/1 of the original metal honeycomb. 6 to 1/3 is desirable. If it is smaller than this, exhaust gas blow-by occurs and the purification rate decreases, and if it is larger than this, the back pressure becomes too large.

Hereinafter, the method of the present invention will be explained in more detail with reference to Examples, but the method of the present invention is not limited to these Examples.

Example 1 Wave height 1.2 mm, length 60 cm, radius 10 cm, thickness 50
μm ferritic stainless steel corrugated plate and wave height 0°2mm
Then, after rolling the otherwise identical corrugated sheets into a 400-cell honeycomb shape, I tied the center part with wire to prevent it from unraveling. This was calcined in a tube furnace at 950° C. for 3 hours in a stream of air.

Commercially available alumina sol (alumina concentration: 10% by weight) 302 was added to tetraamine palladium (I[) acetate solution (palladium concentration: 10% by weight) 2707, and the mixture was stirred well with a magnetic stirrer.

Furthermore, methanol 452 was added and stirred well using the same Magfuchi Sox stirrer. After the metal honeycomb-wound product was completely immersed in this liquid, excess liquid was removed with an air stream. Thereafter, it was fired in a Matsufuru furnace at 400° C. for 30 minutes in an air atmosphere. The amount of palladium supported was 1.25% by weight.

Example 2 Commercially available silica sol (silica concentration: 10.li mass %) 301 was added to 270.9 of a tetraammine palladium (I[) acetate solution (palladium concentration: 10% by weight) and stirred well with a magnetic stirrer. Furthermore, methanol 4
5. ? was added and stirred well using the same magnetic stirrer. After completely immersing a metal honeycomb-wound product prepared in the same manner as in Example 1 in this liquid, excess liquid was removed with an air stream. Then, at 400°C for 30 minutes in an air atmosphere.
Fired in a Matsufuru furnace. The amount of palladium supported is 1.2
It was 5% by weight.

Example 3 Commercially available zirconyl acetate (zirconium oxide concentration: 10% by weight) 302 was added to tetraamine palladium Cm) acetate solution (palladium concentration: 10% by weight) 270j,
Stir well with a magnetic stirrer. Furthermore, methanol 452 was added and stirred well using the same magnetic cooler. After completely immersing a metal honeycomb-wound product prepared in the same manner as in Example 1 in this liquid, excess liquid was removed with an air stream. Thereafter, it was fired in a Matsufuru furnace at 400°C for 30 minutes in an air atmosphere. The amount of palladium supported is 1
．． It was 25% by weight.

Example 4 Commercially available titanic acid (titanium oxide concentration: 10% by weight) 302 was added to a tetraamine palladium (II) acetate solution (palladium concentration: 10% by weight) 2702, and the mixture was stirred well with a magnetic stirrer.

Furthermore, methanol 45I was added and stirred well using the same magnetic stirrer. After completely immersing a metal honeycomb-wound product prepared in the same manner as in Example 1 in this liquid, excess liquid was removed with an air stream. Thereafter, it was fired in a Matsufuru furnace at 400°C for 30 minutes in an air atmosphere. The amount of palladium supported was 1.25% by weight.

Example 5 Commercially available alumina sol (alumina concentration: 10% by weight) 302 was added to 27M of tetraamminepalladium(n) acetate solution (palladium concentration: 10% by weight) and stirred well with a magnetic stirrer.

Furthermore, ethanol 452 was added and stirred well using the same magnetic cooler. After completely immersing a metal honeycomb-wound product prepared in the same manner as in Example 1 in this liquid, excess liquid was removed with an air stream. Thereafter, it was fired in a Matsufuru furnace at 400°C for 30 minutes in an air atmosphere. The amount of palladium supported was l, 25% by weight.

Example 6 Commercially available alumina sol (
Alumina concentration: 10% by weight) 301 was added and stirred well with a magnetic stirrer.

Furthermore, PropaTool 452 was added, and the mixture was well stirred using the same magnetic stirrer. After completely immersing a metal honeycomb-wound product prepared in the same manner as in Example 1 in this liquid, excess liquid was removed with an air stream. Thereafter, it was fired in a Matsufuru furnace at 400° C. for 30 minutes in an air atmosphere. The amount of palladium supported was 1.25% by weight.

Example 7 Commercially available alumina sol (alumina concentration: 10% by weight) 301 was added to tetraamine palladium (I[) acetate solution (palladium concentration: 10% by weight) 2707, and stirred well with a magnetic stirrer.

Furthermore, butanol 451 was added and stirred well using the same magnetic stirrer. After completely immersing a metal honeycomb-wound product prepared in the same manner as in Example 1 in this liquid, excess liquid was removed with an air stream. Then, at 400℃ for 30 minutes,
It was fired in a manful furnace under an air atmosphere. The amount of palladium supported was 1.25% by weight.

Example 8 Palladium nitrate solution (palladium concentration: 10% by weight) 2
Commercially available alumina sol 302 (alumina concentration: 10% by weight) was added to 70I and stirred well with a magnetic stirrer. Furthermore, methanol 452 was added and stirred well using the same magnetic stirrer. After completely immersing a metal honeycomb-wound product prepared in the same manner as in Example 1 in this liquid, excess liquid was removed with an air stream. Then, at 400°C
It was fired in a Manofru furnace under an air atmosphere for 0 minutes.

The amount of palladium supported was 1.25% by weight.

Example 9 Tetraammineplatinum(II) acetate solution (platinum concentration: 1
Commercially available alumina sol (alumina concentration: 10% by weight) 302 was added to 270 & (0% by weight) and stirred well with a magnetic stirrer. Furthermore, methanol 452 was added and stirred well using the same magnetic stirrer. After completely immersing a metal honeycomb-wound product prepared in the same manner as in Example 1 in this liquid, excess liquid was removed with an air stream. After that, 4
It was fired at 000C for 30 minutes in an air atmosphere in a Matsufuru furnace. The amount of platinum supported was 1.25% by weight.

Example 10 Rhodium acetate solution (rhodium concentration: 10% by weight) 270
2. Commercially available alumina sol (alumina concentration: 10% by weight)
30I was added and stirred well with a magnetic stirrer. Furthermore, methanol 452 was added and stirred well using the same magnetic stirrer. After completely immersing a metal nicam-wound product prepared in the same manner as in Example 1 in this liquid, excess liquid was removed with an air stream. Then at 400°C for 30
It was baked in a Matsufuru furnace for 1 minute under an air atmosphere. The amount of rhodium supported was 1.25% by weight.

Comparative Example 1 Aqueous solution of palladium chloride in hydrochloric acid (palladium concentration: 1
0% by weight) 270. ? Commercially available alumina sol 302 (alumina concentration: 10% by weight) was added to the mixture and stirred well with a magnetic stirrer. Furthermore, add 45 liters of methanol,
It was also stirred well using a magnetic stirrer. After completely immersing a metal honeycomb-wound product prepared in the same manner as in Example 1 in this liquid, excess liquid was removed with an air stream. after that,
It was fired in a Matsufuru furnace at 400°C for 30 minutes in an air atmosphere.

Comparative Example 2 A metal honeycomb wound product prepared in the same manner as in Example 1 was completely immersed in a 300:l tetraamine palladium (n) acetate solution (palladium concentration: 10% by weight), and then the excess liquid was removed with an air stream. Ta. Thereafter, it was fired in a Matsufuru furnace at 400''C for 30 minutes in an air atmosphere.

Comparative Example 3 Tetraamine palladium (I[) acetate solution (palladium concentration: 10% by weight) 270. ? Commercially available alumina sol 302 (alumina concentration: 10% by weight) was added to the mixture and stirred well with a magnetic stirrer.

After completely immersing a metal honeycomb-wound product prepared in the same manner as in Example 1 in this liquid, excess liquid was removed with an air stream. Thereafter, it was fired at 4000C for 30 minutes in an air atmosphere in a Matsufuru furnace.

Comparative Example 4 Tetraamine palladium (I[) acetate solution (palladium concentration: 10% by weight) 270. ? methanol 452
was added and stirred with a magnetic stirrer. After completely immersing a metal honeycomb-wound product prepared in the same manner as in Example 1 in this liquid, excess liquid was removed with an air stream. After that, 4
It was fired in a Matsufuru furnace at 00°C for 30 minutes in an air atmosphere.

Comparative Example 5 1.25% by weight of palladium was supported on two corrugated plates obtained by unraveling a metal honeycomb wound product prepared in the same manner as in Example 1 by electroplating.

Comparative Example 6 Amine solution of hydroxyplatinic acid (platinum concentration: 10% by weight) 2
Calpitol aqueous solution of ethyl cellulose in 707 752
added. After mixing the two well and confirming that many fine particles of platinum were generated, the mixed solution was thoroughly applied to both sides of two corrugated plates made from unwound metal honeycomb products prepared in the same manner as in Example 1 with a brush. Ta. Thereafter, it was fired in a Matsufuru furnace at 400° C. for 30 minutes in an air atmosphere.

Comparative Example 7 A 400-cell ceramic honeycomb carrier was coated with γ-alumina slurry that had been milled for 6 hours using a ball mill.
After coating with O02 wash, 1 per liter at 600℃.
It was fired in a Matsufuru furnace under an air atmosphere for an hour. This ceramic honeycomb carrier is palladium chloride salt! [The carrier was completely immersed in an aqueous solution, and 22 palladium was supported per 1Q of carrier by an impregnation method. After reduction with hydrazine, it was washed with pure water to remove chlorine.

Effect of halogens When the catalyst using a precious metal compound containing chlorine (palladium chloride) obtained in Comparative Example 1 was taken out of the Matsufuru furnace, the surface of the ferritic stainless steel corrugated plate was corroded by chlorine and became crumbly. It had become. On the other hand, the surfaces of the ferritic stainless steel corrugated plates of the catalysts obtained in Examples 1 to 10 and Comparative Examples 2 to 6 other than Comparative Example 5 using the electroplating method without a firing process were When taken out, no corrosion was observed in either case. According to this result, if a halogen such as chlorine is contained in a solution (which may be a suspension) containing a noble metal compound, a refractory metal compound, and an alkyl alcohol, the prepared noble metal-supported metal catalyst It has become clear that the metal carrier itself corrodes and becomes unusable.

Peeling test The catalysts obtained in Examples 1-10 and Comparative Example 5 hardly caused any peeling of precious metals even when the wires were unwound to form two corrugated plates and then pounded or rubbed. .

On the other hand, when the catalysts obtained in Comparative Examples 2 to 4 and 6 were hit or rubbed, all the precious metals were peeled off.
When the weight was measured, it returned to the weight before supporting the precious metal.

JP-A-59-123535 discloses a method for supporting a noble metal characterized by the coexistence of a fine noble metal powder and its ions, but as is clear from the peel test of the catalyst obtained in Comparative Example 6. It was found that the organic binder (an aqueous solution of ethylcellulose in calpitol) disclosed in the same publication could not suppress the peeling of precious metals. On the other hand, if a halogen-free noble metal compound, a halogen-free refractory metal compound, and a solution (or suspension) of an alkyl alcohol are used according to the present invention, the noble metal can be peeled off from the metal material. I found that it almost never happens.

Conventional methods for manufacturing honeycomb type catalysts include a process of milling fine particles such as γ-alumina for several hours to several dozen hours to form a slurry, a process of coating γ-alumina, etc., and a method of immersing precious metals in γ-alumina etc. The method of the present invention requires only one step of supporting the precious metal on a metal carrier, which significantly reduces the cost required for production. Not only was it possible to remove the precious metal from the metal material, but there was also almost no peeling of the precious metal from the metal material.

Oxidation Activity Test The catalysts obtained in Examples 1 to 8 were each cut into two corrugated sheets with a shredder having a diameter of 3 mm and a length of 60 cm. The catalyst obtained in Comparative Example 5 was also shredded.
was cut.

The catalysts cut into ribbons by a shredder were weighed in 82 pieces each, and 50 c
m” size (bottom 10cm2, height 5cm). Through this operation, the catalyst i having a ribbon-like shape was
The amount of palladium supported per ff was 22, and the packing density was reduced to 1/4 of that of the original 400-cell metal honeycomb carrier.

The ceramic honeycomb-supported catalyst obtained in Comparative Example 7 was also cored to a size of 50 cm' (same as above) and then cut with a diamond cutter.

The oxidation activity test was carried out using the oxidation reaction of n-hexane (catalyst amount = 50 cm", GH5V = 1200
0 hr-' n-hex7 = 340 ppm, air balance).

In the fresh state, the ribbon-shaped catalysts obtained in Examples 1 to 8 and Comparative Example 5 were heated at temperatures at which n-hexane was oxidized by 50% and 90% (50% reaction temperature, 90% reaction temperature) is 205-245℃, 2
40 to 265°C, and 50% reaction temperature of the catalyst using the ceramic honeycomb obtained in Comparative Example 7 as a carrier, 230°C, 9
The performance was almost the same as the 0% reaction temperature of 250°C.

Next, each of the catalysts obtained in Examples 1 to 8 and Comparative Example 5.7 was fired in a Matsufuru furnace at 1000°C for 10 hours in an air atmosphere. After heat treatment at 1000° C., only the catalyst of Comparative Example 5 in which palladium was supported by electroplating was deactivated. From this result, it can be said that the electroplated precious metal-supported metal catalyst has significantly inferior catalytic activity after heat treatment.

In contrast, the catalysts of Examples 1 to 8 had a reaction temperature of 50%,
90% reaction temperature is 270-318°C! , 29
0 to 350°C, 50% reaction temperature of catalyst with ceramic honeycomb as carrier 315°C 190% reaction temperature 345
The performance was equivalent to or better than that of °C.

As described above, the noble metal-supported metal catalyst having a ribbon-like shape prepared by the method according to the present invention can be used even if the amount of metal material used is reduced to 1/4 of the conventional No.
Catalytic properties comparable to those of ceramic honeycomb were maintained. As a result, the ribbon-shaped noble metal-supported metal catalyst disclosed in the present invention can reduce the cost of metal materials to 1/4 of that of conventional metal honeycomb supports, and
It has been found that the weight of the catalyst itself can be reduced to 1/4. Furthermore, it has been found that the price and weight of this ribbon-shaped metal carrier are considerably lower than those of conventional ceramic honeycomb carriers.

[Effect] As is clear from the above, the method of the present invention provides simple,
It has become possible to manufacture a noble metal-supported metal catalyst that is inexpensive and has excellent adhesion to the catalyst, and to manufacture an inexpensive and lightweight metal carrier.

Furthermore, the ribbon-shaped noble metal-supported metal catalyst obtained by the method of the present invention is not limited to a specific size or shape, and can be filled in any location such as a pipe, pipe, cylindrical or rectangular catalyst bed. It is.

Patent applicant: N.E. Chemcat Co., Ltd. and others 1
given name

Claims (2)

[Claims] (1) Plate-shaped, honeycomb-shaped, ribbon-shaped, ring-shaped, net-shaped,
When manufacturing a noble metal-supported metal catalyst in which a noble metal is supported on a metal material having a shape such as a line, a solution containing a halogen-free noble metal compound, a halogen-free refractory metal compound, and an alkyl alcohol is applied to the metal material. A method for producing a noble metal-supported metal catalyst, which comprises heat-treating the metal material after the metal material is deposited. (2) The solution according to claim 1 is attached to a metal material having a honeycomb shape obtained by stacking and winding two metal plates, at least one of which is a corrugated plate, and then heat-treated,
A method for producing a noble metal-supported metal catalyst in which a noble metal is supported on a metal material having a ribbon-like shape, the method comprising unraveling the metal material and cutting it into ribbons.