JPS5835739B2 - Catalyst structure and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a catalyst structure having a shaped and fired body of titanium oxide powder on the surface of a metal base material, and a method for producing the same.

Titanium oxide and molded products obtained by uniformly mixing and firing titanium oxide and various metal oxides are used as catalyst bodies for removing harmful substances from exhaust gas by a dry treatment method.

For example, various combustion furnace exhaust gases containing nitrogen oxides (hereinafter abbreviated as NOx) and sulfur oxides (hereinafter abbreviated as SOx), nitric acid plant exhaust gas, iron and steel plant exhaust gas, and Krausetail containing various malodorous substances such as hydrogen sulfide. It is used to treat gas, paper plant exhaust gas, and various other exhaust gases.

When carrying out the dry treatment method, a fixed bed reactor is usually used in which catalyst bodies in the form of pellets such as columnar, cylindrical, annular bispherical or granular shapes are randomly packed.

In this case, if the amount of exhaust gas to be treated is large, the size of the reactor filled with the catalyst must necessarily be increased.

As the size of the reactor increases, cross-linked states between catalyst particles are formed in some places within the catalyst layer.

Therefore, there is a risk that m flows of the gas to be treated will occur or that the catalyst body will be damaged by its own weight.

BACKGROUND OF THE INVENTION Exhaust gas from a combustion furnace using fossil fuels such as coal, double fuel oil, and crude oil contains a large amount of unburned substances such as oil smoke and non-combustible dust containing heavy metals.

In addition, the exhaust gas from coke ovens and combustion furnaces contains large amounts of dust such as heavy metals and ash, while the exhaust gas from glass melting furnaces and paper manufacturing plants contains a large amount of strongly adhesive mirabilite and alkali fume.

When exhaust gas containing a large amount of dust is supplied to the above-mentioned irregularly packed fixed bed reactor, the pressure loss in the reactor increases over time due to the accumulation of dust, which can sometimes clog the reactor. There is 1 udo.

As a small and lightweight reactor with low pressure loss in the reactor, there is a parallel flow reactor that uses a catalyst structure of various shapes such as a nicam type, a plate-shaped catalyst structure, or a wire mesh as a core material. .

When attempting to mold powder containing titanium oxide as a main component to produce fired bodies of various shapes for use in fixed bed or parallel flow reactors as described above, there are problems in moldability and strength.

Specifically, the fired body used as a catalyst must have a sufficiently large specific surface area, and the firing temperature must be low.

Naturally, if the firing temperature is lowered, the mechanical strength and the adhesion strength to the core material such as wire mesh will be extremely reduced.

When trying to make a large No. 2 cam type molded body using the wet method,
A large amount of water is required to knead titanium oxide powder, and it takes a long time to remove this water.

For these reasons, there has been a need for a titanium oxide powder raw material that has high strength and good formability.

The present inventors have searched for a binder that can reduce the amount of water when kneading titanium oxide powder and can also increase the mechanical strength of fired products.

Organic binders such as methyl cellulose and polyvinyl alcohol and glue have little effect on lowering the moisture content of contaminants during extrusion molding, and the mechanical strength of the molded product after firing actually decreases. .

It has also been found that alumina or silica-based inorganic binders do not reduce the amount of water in the mixed material during extrusion molding, and may have a negative effect on catalyst activity.

An object of the present invention is to provide a catalyst structure having a titanium oxide fired body having high mechanical strength and a large specific surface area, and a method for producing the same.

The catalyst structure of the present invention contains molybdenum oxide as a binder and has a core material made of a metal base material.

The amount of molybdenum oxide in the fired body is preferably 1 to 20% by weight as MoO3, and 3 to 20% by weight if the titanium oxide particles are fine.
20 weight more is desirable.

A characteristic feature of this fired body is that there is a molybdenum oxide layer with a thickness of at least several tens to hundreds of amps at the active sites on the surface of the titanium oxide particles, and the presence of this layer reduces the distance between the titanium oxide particles. They are closely spaced to form a mechanically strong fired body.

In conventional products made by mixing and sintering titanium oxide and molybdenum oxide powder, the titanium oxide and molybdenum oxide particles exist as separate particles, but in the fired product of the present invention, the surface of the titanium oxide particles is made of molybdenum oxide. covered with a thin film of

The fired body of the present invention uses as a raw material titanium oxide powder treated in a high vapor pressure atmosphere of molybdenum, specifically, in a vapor pressure of 10''6 to 10<-4 >atm.

Titanium oxide powder treated in a high vapor pressure atmosphere of molybdenum oxide as described above can be kneaded with an extremely small amount of water, and by molding and firing it, a fired product with high density, high strength, and high specific surface area can be produced. Obtainable.

The specific treatment method for titanium oxide is to use titanium oxide or a titanium compound that produces titanium oxide by heat treatment, molybdenum oxide or a molybdenum compound that produces molybdenum oxide by heat treatment, and other active materials as necessary. 460 to 6 mixtures of component compounds
2 to 10 at 10°C, preferably 480 to 580°C
This is done by heating in a closed container for an hour.

As another treatment method, the titanium monoxide powder may be passed through a furnace with a temperature gradient, and molybdenum oxide vapor may be introduced into the furnace to impregnate the surface of the titanium oxide powder with molybdenum oxide.

The following experiment revealed that the surface of titanium oxide powder was covered with molybdenum oxide by the above treatment method.

For the experiment, titanium oxide powder and molybdenum oxide powder were first prepared as follows.

Titanium oxide powder: Metatitanic acid slurry was heated and kneaded to reduce water content to 30 to 35 weight φ, and then dried at 120°C for 5 hours.

Molybdenum oxide powder; ammonium molybdate 10
450° after pulverizing finely enough to pass through a mesh sieve.
Bake at G for 2 hours.

These powders were mixed in a mortar and the atomic ratio of titanium and molybdenum was 95:5, 90:10, 85:15.80:20.
, 70:30 mixture was obtained.

Each mixture was measured by X-ray diffraction, and the diffraction angle was 233 degrees (Cu-
The peak intensity of molybdenum oxide was confirmed at the position of α ray).

This revealed that molybdenum oxide was MoO3.

Next, each mixture was baked at 530° C. for 2 hours and measured by X-ray diffraction.

In this case as well, the peak intensity of molybdenum oxide was observed at the position of the diffraction angle 2θ = 23.3 degrees (α rays in Cu-), but the value of the peak intensity was significantly lower than the value measured before firing.

The peak intensity of MoO3 before and after firing is corrected by the sample packing density during X-ray diffraction and shown in relation to the MoO3 content.
It will look like the figure.

The white circles are the properties of the powder mixture before firing, and the black circles are the properties after firing.

When the powder is mixed and then fired, the peak intensity of the diffraction line based on the MoO3 crystal decreases significantly, and even if MoO3 is added at an atomic ratio of titanium and molybdenum of 80:20, the intensity of the diffraction line is very weak.

However, when the amount of MoO3 added is further increased, MoO3
The intensity of the diffraction lines increases.

At this time, when the molybdenum content of the sample at the time of the above measurement is analyzed by a chemical analysis method, it almost matches the atomic ratio of each sample.

Furthermore, the diffraction lines based on the crystals of titanium oxide powder hardly change before and after firing.

This can be interpreted as follows.

That is, after powder mixing, titanium oxide and MoO3 were in a mixed state, and at least MoO3 was a crystal large enough to give X-ray diffraction, but by firing, MoO3 was dispersed and precipitated on the surface of the titania particles. It is small enough that X-ray diffraction does not occur.

Therefore, when the powder is mixed and then fired, the surface of the titanium oxide powder is covered with fine molybdenum oxide particles.

The lower limit of the preferred amount of molybdenum oxide (1) to 20% by weight is selected as an amount suitable for kneading with a small amount of water, and the upper limit is not particularly limited.

If molybdenum oxide is effective as an active component of the catalyst in the fired product, a larger amount can be contained.

However, in order to exhibit the characteristics of a titanium-based fired body, it is desirable that the content of titanium oxide be 50 weight φ or more, and it is desirable that the amount of molybdenum oxide not exceed 50 weight φ.

Titanium oxide powder impregnated with molybdenum oxide is approximately 2
By adding and kneading 5 to 6 parts of water or less, the mixture becomes slurry and can be easily molded or applied to base materials such as porous bodies and wire meshes.

It is not clear why the titanium oxide powder turns into a slurry at such a very low moisture content, forming a cross-contaminant that can be coated onto an extruded or colored substrate.

However, since a low moisture contaminant is obtained and the mechanical strength of the final fired body is high, molybdenum oxide repeatedly evaporates and condenses on the surface of titanium oxide and forms on the surface active sites of titanium oxide fine particles. It is thought that the precipitation of molybdenum oxide enabled the formation of a low water content capillary region.

Raw materials for titanium oxide include anatase and rutile titanium oxide as well as orthotitanic acid.

Various materials are used, such as metatitanic acid and compounds that produce titanium oxide when heated.

Preferred molybdenum raw materials include molybdenum oxide, molybdic acid, and ammonium molybdate.

The raw material titanium oxide and molybdenum oxide powder are mixed well,
Add about 30 to 60% water as needed, mix well with a mixer to make it homogeneous, and then extrude into granules.

After going through processes such as drying and pulverization, it enters a preliminary firing process to bring out the binder effect of molybdenum oxide.

The particle size at the time of pre-punishment is not particularly limited, but it is better to have a preferable particle size for the wet kneading process after the pre-combustion process, and specifically, powder with a volume of at least 80
It is best to have something that can pass a 0 mesh sieve.

The pre-firing treatment may be carried out in a gas furnace or an electric furnace under a normal air atmosphere, but it is preferably carried out in a container with a lid at 460 to 610°C as described above.
The heat treatment is preferably carried out at a temperature of 480 to 580°C.

This makes it possible to increase the partial pressure of molybdenum oxide vapor in the container and quickly exhibit the binder effect of molybdenum oxide.

The raw material obtained by this treatment is again pulverized, a small amount of water is added, and other ingredients are added as necessary, and then kneaded in a mixing machine for 1 to 5 hours to compact it. As a result, a kneaded material for a nicham molded product or a kneaded material for coating on various substrates such as a wire mesh is obtained.

The fine wire mesh is preferably 20 meshes or more, preferably 40 meshes or more.

If the wire mesh is coarser than this, it will be difficult to attach the catalyst, and even if it is attached, the contact area between the wire mesh and the catalyst will be small, so the bonding force will be weak and it will be easy to peel off.

The material of the wire mesh is titanium and nickel. Heat resistant materials such as molybdenum, chromium, and tungsten.

Corrosion-resistant metals or steel alloys thereof are desirable.

Stainless steel is particularly desirable from a cost standpoint. A titanium oxide catalyst using molybdenum oxide as a binder can provide strong bonding strength just by applying it and firing it, but it is possible to obtain an even stronger bonding strength by compressing it with a punch-out or press after application and then firing it. can.

When adding active ingredients other than titanium oxide and molybdenum oxide to the fired body, it is preferable to add them to the kneading and compaction process or to mix them with the titanium and molybdenum compounds from the beginning before proceeding with the subsequent steps.

The same applies to the case where molybdenum salt is added as a catalytically active component.

FIG. 1 shows the relationship between the optimum moisture content and the amount of molybdenum oxide added for forming a fired body containing a wire mesh base material using the mixed wire obtained as described above.

These are actual measured values when applied to a wire mesh of SUS 304 stainless steel with 45 mesh.

It can be seen that the amount of water required is significantly lower than the amount required when no molybdenum oxide is added.

FIG. 2 shows the relationship between the required optimum moisture content and pre-calcination temperature.

The mechanical strength of the final fired body obtained by completing the drying and firing steps is also significantly improved as the binder effect of molybdenum oxide is improved.

Figure 3 shows the amount of molybdenum added and the firing rate determined from the cellophane tape beer test (a test method in which cellophane tape is attached to the surface of the fired product and then peeled off to determine the amount of catalyst peeled off) of the fired product applied to a 45-mesh stainless steel wire mesh. As shown in the relationship between the peeling rate of the fired body, it can be seen that as the amount of molybdenum added increases and its binder effect increases, the bonding strength of the fired body increases.

Examples of molybdenum oxide catalyst components having a binder effect according to the present invention include those shown below.

Titanium oxide and Fe, Co, Ni, Cu, Cr.

A catalyst for reducing nitrogen oxides in exhaust gas from various fixed sources with ammonia, including one or more of the oxides of Mo, W, V, Ce, and Sn.

A catalyst for oxidizing carbon monoxide and hydrocarbons in automobile exhaust gas, combustion exhaust gas, etc., which is made by adding a small amount of at least one of platinum metal elements such as Pt, Pd, Rh, and Ru to titanium oxide.

A catalyst for oxidizing hydrogen sulfide, comprising titanium oxide and one or more types of oxides of Mo>W, V, and Fe.

When configuring the catalyst structure formed in Example 1 of the present invention as a parallel flow reactor, the catalyst structure may be appropriately configured to facilitate inspection, repair, replacement, regeneration, etc. of the device and the catalyst structure. Can be made into units of unit size.

When treating a large volume of shredded exhaust gas, it is preferable to form a unit because a plurality of reactors of a constant volume can be arranged to form the final reactor.

A plate-shaped catalyst structure based on wire mesh has a corrugated plate shape.

It can be formed into various shapes such as rolls,
Parallel flow reactors of various shapes can be manufactured, and a honeycomb type catalyst layer can be easily constructed.

For a parallel flow reactor, the gas passage cross-sectional area of one section is 4~
400mt? A range of b is appropriate.

When the cross-sectional area is smaller than 4 -, the pressure loss in the reactor is too high, making it unsuitable for treating exhaust gas containing a large amount of dust.

Also, 4007n7? When it is larger than t, the geometrical outer surface area of the catalyst structure per catalyst layer volume cannot be increased,
This is disadvantageous because sufficient harmful substance removal performance cannot be achieved and the reactor becomes larger.

The effects of the present invention can be summarized as follows.

(1) Due to the excellent binder effect of molybdenum oxide, a molded catalyst structure with excellent mechanical strength can be obtained, and can sufficiently withstand vibration, impact, friction, etc. during use.

Moreover, the moldability of the catalyst structure is also easy.

(2) The opening ratio of the cross-section of the catalyst layer (ratio of the gas flow area to the total cross-sectional area of the catalyst) can be increased, and a reactor with low pressure loss can be configured, and it can contain a large amount of dust and a large amount of exhaust gas. can be treated stably and efficiently over a long period of time.

Although the catalyst structure of the present invention is suitable as a honeycomb type or plate-shaped catalyst, the shape of the catalyst structure is not particularly limited when treating exhaust gas containing almost no dust. It can be molded into any shape such as columnar, cylindrical or bispherical.

EXAMPLES The content of the present invention will be explained in more detail with reference to Examples below.

Example 1 Titanium oxide and t? To 1000 g of metatitanic acid slurry containing 35% (by weight), 27.5 g of ammonium metavanadate (NH4VO3) and 70.8 g of ammonium molybdate ((NH4)a MO7024''4H20) were added.
g was added and kneaded in a kneader for 2 hours.

This kneaded material was dried at 150° C. for 5 hours and pulverized to the extent that it could pass through a 60-mesh sieve with a width of about 90 mm.

This mixture powder was preliminarily calcined at 530° C. for 3 hours to precipitate molybdenum oxide on the titanium oxide powder, and then mixed in a kneader again for 2 hours.

At this time, if the water content is 20 to 22%, a paste-like catalyst mixture is obtained.

A portion of this paste catalyst mixture was placed in a 200 mm x 10
001nrfL was applied to the entire surface of a 45-mesh wire mesh.

The wire mesh coated with the catalyst is made by arranging two stainless steel plates in a slit shape, each of which has a rectangular contact area with the wire mesh.
Excess catalyst paste was removed through a scraper with a spacing of 0.4 mm.

After the wire mesh coated with this catalyst was allowed to stand at room temperature for 10 to 20 minutes, it was pressed and bonded using a roller rolling machine coated with polytetrafluoroethylene.

After drying this molded product at 150°C for 3 hours, it was dried at 450°C for 2 hours.
Baked for an hour.

The resulting catalyst structure is titanium. Contains vanadium and molybdenum in an atomic ratio of 87.6 and 7, respectively.

The thickness of this plate-shaped catalyst structure was 0.5 mm.

The plate-shaped catalyst structure was cut into 50mm x 50mm pieces to be used as test pieces, and a beer test was conducted, and the peeling rate was 0.9 mm.

Moreover, the peeling rate when this test piece was dropped from a height of 1 m was 0.5φ or less.

Example 2 1.5 kg of titanium oxide and 1 ammonium metavanadate
Add 16g of ammonium molybdate and add 62g of ammonium molybdate.
Add 4 g (10 weight @ converted to MoO3 based on the total weight of the catalyst), add 21 g of water and mix well with a kneader,
After drying at °C, it was crushed and pre-calcined at 530 °C for 2 hours.

Add water to this powder and heat and knead it with a kneader to remove moisture by 22φ
A catalyst for impregnating a wire mesh was obtained as a sample.

The catalyst obtained in this way was applied with a brush to a 45-mesh stainless steel wire gauze, and then air-dried at -120°C day and night.
After drying for 5 hours, it was finally fired at 500° C. for 2 hours.

A beer test was conducted to evaluate the adhesion between the wire mesh and catalyst of the wire mesh impregnated catalyst structure produced by the above method.

As a result, the catalyst structure impregnated with a wire mesh according to the present invention had a peeling rate of 0.5 weight φ and exhibited very strong bonding strength.

Example 3 Titanium and vanadium obtained in the same manner as in Example 2.

The molybdenum kneaded material was coated on the entire surface of a 200-mesh stainless steel wire mesh with a size of 255 mm x 400 mm, and was pressed with a roll roll coated with boriadrafluoroethylene to support it on the wire mesh base material.

After drying this, it was calcined at 530° C. for 2 hours to obtain a plate-shaped catalyst structure.

The thickness of this plate-shaped catalyst structure was approximately 0.5 mm.

These plate-shaped catalyst structures were installed at 6 mm intervals so that their surfaces were parallel to the gas flow, and the length was 4001 m7 with an angle of 252 mm.
A unit reactor of rL was constructed.

These unit reactors were stacked in four stages to take over the entire catalytic reactor.

The aperture ratio of this reactor is 95.

The weight of the shredded plate-shaped catalyst is approximately 13 ky, which is approximately 1/10 of the weight of conventional pellet-shaped catalysts, and the amount of catalyst used is approximately 1/25 of that of conventional pellet-shaped catalysts. was able to be reduced to

A coal-fired boiler exhaust gas having the following composition was added to this reactor.
A denitrification experiment was conducted under operating conditions of supplying at a flow rate of 00ON'/h (SV"10000h-'), NH3/NO ratio of 1.1, and reaction temperature of 350°C.

The dust concentration was 22 g/Nm. As a result, the initial denitrification rate was about 89 mm, and the total reactor loss was 18 mm Aq.

Changes in denitrification rate and reactor pressure drop over time were investigated.

Even after peeling after 1000 hours, the denitrification rate was approximately 87φ, which was almost constant, and the reactor pressure loss was 23m1Aq.
There was almost no increase.

Furthermore, the denitrification catalyst structure with a wire mesh of this example was not poisoned by SOx in the gas and exhibited stable performance over a long period of time.

Examples 4 and 5 A catalyst for impregnating a wire mesh to which one of Fe and W was added was produced through the same steps as in Example 2.

The amount of MoO3 was set to 5 times maximum.

Ti:Fe (95:5) Example 4Ti:W
(95:5) Example 5 The thus obtained catalyst (Ti:Fe) was placed in a 100-mesh wire mesh, and (Ti:W
) was applied and pressure bonded to a 200 mesh wire mesh.

These were dried and baked in the same manner as in Example 2, and then subjected to a beer test.

The peeling rate was very low at 0.8 weight φ in both Examples 4 and 5.

Example 6 Ammonium molybdate ((NH4
) 6 MO7024" 4 H20) 85.8g was added and heated and kneaded in a kneader for 2 hours to reduce the water content to about 35 weight φ.
And so.

This kneaded material was dried at 150° C. for 5 hours and pulverized to the extent that about 90 times it passed through a 60 mesh sieve.

After preliminarily calcining this powder at 530° C. for 3 hours in an electric furnace, water was added in an amount of 21 to 23% by weight and kneaded again in a kneader to obtain a paste-like catalyst mixture.

A portion of this paste catalyst mixture was placed in a 200 mm x 50
It was applied to the entire surface of a 0 mm, 45 mesh wire mesh using a doctor blade method.

This was dried at room temperature for 5 hours, further dried at 150°C for 3 hours, and fired at 450°C for 3 hours.

The catalyst is an oxide catalyst containing titanium and molybdenum in an atomic ratio of 9:1.

The thickness of this plate-shaped catalyst structure was 0.5 mm.

The plate-shaped catalyst structure was cut into 50 rna x 50 mm test pieces and subjected to a beer test, and as a result, the peeling rate was the highest by 0.75 weight.

Example 7 Using the paste catalyst mixture obtained in Example 6, a plate-shaped catalyst structure was manufactured according to the method described in Example 3,
A denitrification experiment was conducted.

The initial denitrification rate was 83φ, and the reactor pressure drop was 19m.
It was mAq.

The denitrification rate after 1000 hours was 82%, and the reactor pressure loss was 20 mlAq.

Example 8 19 to 21 weight φ of water was added to a mixed powder of titanium and molybdenum that had been prefired through the same steps as in Example 6, and the mixture was kneaded in a kneader.

A portion of the obtained paste-like catalyst mixture was placed in a 50.0 mm×
It was dispersed on a stainless steel wire mesh of 1,000 mm and 45 mesh, and rolled with a roller rolling mill.

The distance between the rollers was 0.4.

Thereafter, it was dried at room temperature for 5 hours, further dried at 1500G for 3 hours, and then fired at 450°C for 3 hours.

The catalyst is an oxide catalyst containing titanium and molybdenum in an atomic ratio of 9=1.

The thus obtained plate-shaped catalyst structure was cut out into 50 mm x 50 square pieces, used as test pieces, and subjected to a beer test. As a result, the peeling rate was 0.140 mm by weight.

Comparative Example 1 116 g of ammonium metavanadate was added to 1.5 kg of titanium oxide, and further 62 g of ammonium molybdate was added.
4 g (IO weight φ converted to MoO3 based on the total weight of the catalyst), 21 g of water was added, and Al□ was added as a binder.
Nasol (10% by weight based on the total weight of the catalyst) was added and then heated and kneaded in a kneader to form a paste-like mixture with a moisture content of 35 to 40% by weight.

The paste-like mixture thus obtained was applied with a brush to a 45-mesh stainless steel wire gauze, air-dried day and night, ■ dried at 20°C for 5 hours, and finally heated to 500°C x 2
Firing was performed in h.

The beer test result of the catalyst thus obtained was that the peeling rate was 6.
It was found that the adhesion was very poor.

Comparative Example 2 Ammonium molybdate ((NH
4) 85.8 g of 6Mo7024.4H20) was added and heated and kneaded in a kneader for about 2 hours to obtain a paste-like catalyst mixture with a moisture content of 35 to 40% by weight.

A part of this paste-like catalyst mixture was placed in a 200 mm x 500
It was applied to the entire surface of a wire mesh of 45 mm and 45 mesh using the dogtaflade method.

Thereafter, it was dried at room temperature for 5 hours, further dried at 150°C for 3 hours, and then fired at 450°C for 3 hours.

The obtained plate-shaped catalyst structure contains both titanium and molybdenum in the form of oxides, and the atomic ratio of titanium to molybdenum is 9 titanium: 2 molybdenum.

The thickness of the plate-like catalyst structure is approximately 0.5 mm. The plate-shaped catalyst structure thus obtained was 50 mm x 50 mm.
The catalyst structure was cut into test pieces and subjected to a beer test. As a result, the peeling rate was 25.5% by weight, and it was confirmed that the catalyst structure was significantly weaker than the catalyst structure of Example 6.

[Brief explanation of the drawing]

Figure 1 is a graph showing the relationship between the amount of molybdenum oxide added to molding moisture content, Figure 2 is a graph showing the relationship between molding moisture content and pre-firing temperature, and Figure 3 is a graph showing the effect of molybdenum content on peeling rate. FIG. 4 is a graph showing the relationship between the peak intensity of MoO3 and the amount of molybdenum in X-ray diffraction.

Claims (1)

[Scope of Claims] 1. A catalyst component formed by covering the surface of titanium oxide powder or a mixture powder of titanium oxide and other active components with molybdenum oxide is supported on the surface of a metal base material, and the catalyst component is A catalyst structure characterized in that the structure is fired and supported on the base material. 2. A catalyst structure according to claim 1, wherein the metallic base material is made of a wire mesh. 3 A step of precipitating molybdenum oxide on the surface of titanium oxide powder or a mixture powder of titanium oxide and other active ingredients in a molybdenum oxide gas phase to use it as a catalyst component, and adding water to the powder obtained in this step and kneading it. A method for producing a catalyst structure, comprising: a step of adhering the kneaded material obtained in the step to the surface of a metal base material; and a step of firing the catalyst component and supporting it on the base material. . 4. A method for producing a catalyst structure according to claim 3, characterized in that the step of precipitating the molybdenum oxide is carried out at a temperature of 40 to 610°C. 5 By clicking on claim 3 or 4, the step of precipitating the molybdenum oxide is performed by uniformly mixing molybdenum oxide powder and titanium oxide powder or a mixture powder of titanium oxide and other active ingredients. A method for producing a catalyst structure, characterized in that it is carried out from a state in which 6. A method for producing a catalyst structure according to claim 3, characterized in that the interfering material is attached by coating a metal base material. 7. A method for producing a catalyst structure according to claim 3, characterized in that the kneaded material is applied to a metal base material and adhered by pressure bonding. 8. A method for producing a catalyst structure according to claim 3, characterized in that a wire mesh is used as the metal base material.