KR0154982B1 - Catalyst for oxidation or decomposition of gas containing odor components - Google Patents

Abstract

The present invention relates to a catalyst for oxidizing or decomposing gas containing an odor component in the presence of oxygen, and more specifically, an active component is supported on a carrier, and silver and manganese in an atomic ratio as an active component. Silver: manganese = 5: 95-50: 50, containing at least one selected from the group consisting of iron, cobalt, nickel, copper, vanadium, zinc and precious metals of group VIII of the Periodic Table of Elements; Containing atomic percent, silver in the form of a compound with oxygen, a compound with oxygen and manganese, or a mixture thereof; manganese in the form of a compound with oxygen, a compound with oxygen and silver, or a mixture thereof; Contains manganese oxides of less than 4, contains iron, cobalt, nickel, copper, vanadium and zinc in the form of oxides, and precious metals of Group VIII of the Periodic Table of Elements It relates to a catalyst for oxidation and decomposition of a gas containing an odor component, characterized in that it comprises in the form of.

This catalyst is an extremely effective catalyst for oxidizing or decomposing gas containing an odor component at a low temperature below 300 ° C.

Description

Catalyst for oxidative decomposition of gas containing odor component

1 is a graph showing the relationship between the removal rate of acetaldehyde and the silver content in the active ingredient when catalytic combustion of acetaldehyde using the catalyst according to Example 1 and the catalyst according to the comparative example of the present invention,

2 is a graph showing the relationship between the acetaldehyde removal rate and the silver content in the active ingredient when catalytically burning acetaldehyde using the catalysts of Examples 3, 4, 5 and Comparative Example 1,

3 to 7 are X-ray diffraction patterns of the catalysts according to Examples and Comparative Examples of the present invention,

8 is a graph showing the removal rate of acetaldehyde and trimethylamine at each reaction temperature of Examples 6, 7, 8 and Comparative Examples 4, 5, 6 catalyst,

9 is a diffraction diagram showing an X-ray diffraction pann of the catalyst of Example 9,

10 is a graph showing the relationship between the acetaldehyde removal rate and the reaction temperature when the catalytic combustion of acetaldehyde using the catalysts of Examples 7, 11 and the catalyst of Comparative Example 7,

11 is a graph showing the relationship between the methylmercatan removal rate and the reaction temperature when methylmercaptan is catalytically burned using the catalyst of Example 7. FIG.

The present invention relates to a catalyst for oxidation and decomposition having a novel active ingredient, and more particularly to a catalyst for oxidizing and decomposing gas containing an odor component generated from industrial exhaust or home appliance equipment at a low temperature below 300 ° C. will be.

Difficult circumstances and problems concerning the living environment, such as gas harmful to the human body discharged from factories, odor gas, pollution of rivers, and noise from traffic engines, have been constantly occurring for decades. Techniques for detoxifying plant exhaust or automobile exhaust gas by catalytic combustion on a catalyst have been conducted since the 1970s, and precious metals such as Pt, Pd, and Rh are generally used as active components of catalysts. In addition, such a catalytic combustion method is a clean combustion method that does not generate NOx, and is applied to various combustors, heaters, and the like, and the active component of the catalyst is similarly a noble metal. However, there is a demand for an oxide catalyst having a high cost and, therefore, a low cost and high performance catalyst. In order to meet such demands, a binary oxide catalyst for catalytic combustion of hydrogen oxide consisting of silver oxide and manganese oxide (Japanese Patent Application Laid-Open No. 55-88850), and a three-way catalytic contact combustion of carbon monoxide and hydrocarbons from oxides of silver, cobalt and manganese Inventions such as an oxide catalyst (Japanese Patent Laid-Open No. 55-88853, 56-40433) have been made. In recent years, with the reinforcement of the flue gas regulation value and the change of the lifestyle which seeks a comfortable living space, the demand of the removal of the gas which is harmful to a human body and odor gas especially generated indoors is increasing. Sources of harmful gases and odorous gases in the room are domestic combustors such as heating, cookers, kitchen appliances, naturally occurring dust, and toilets. Gases emitted from equipment used in the home are not only unburned carbon monoxide and hydrocarbons but also odorous and harmful components such as aldehydes, amines, alcohols, mercaptans, and the like. It is low as about 300 degreeC from normal temperature. Therefore, as a catalyst for exhaust gas treatment, it is desired to exhibit high activity at low temperatures and to have low production costs. However, the above known catalysts are for catalytic combustion of hydrogen, carbon monoxide and hydrocarbons, and are insufficient for treatment of exhaust gas containing various kinds of other odorous components.

An object of the present invention is to provide a catalyst for oxidizing or decomposing malodorous gases, particularly exhaust gases containing various kinds of bad odor components generated indoors.

Another object of the present invention is to provide an oxidation and decomposition catalyst that exhibits high activity at a low temperature of 300 ° C. or lower and a room temperature or more in oxidizing and decomposing exhaust gas containing an odor component generated in a home.

The catalyst for oxidation and decomposition of the present invention is a catalyst for oxidizing or decomposing gas containing a bad odor component in the presence of oxygen and detoxifying it, and an active component is supported on a carrier, and silver and manganese are used as an active component in an atomic ratio. Silver: manganese = 5: 95 to 50:50, and silver is present in the form of a compound of oxygen, a compound of oxygen and manganese, or a mixture thereof, and manganese is a compound of oxygen, oxygen and silver And manganese oxide having a valence of less than 4 and present in the form of a compound or a mixture thereof.

In the oxidation and decomposition catalysts, a porous carrier having a specific surface area of 0.5 m 2 / g or more, which is represented by γ-alumina, TiO ₂ , zeolite or the like, is preferably used. This is because, if the specific surface area of the carrier is small, the supported deodorizing catalyst aggregates. It is desired that the upper limit of the specific surface area be 1000 m 2 / g. In particular, a preferable range is 50-1000 m <2> / g.

The deodorization catalyst may be coated on a ceramic or metal substrate to be used as a deodorization catalyst structure, and a honeycomb shape, a plate-like substrate, a gold mesh or the like is used as these substrates.

Next, the present invention will be described in detail.

The catalyst of the present invention is obtained by adding a solution of neutralizing agents such as ammonia, alkali carbonate and alkali hydroxide to a mixed aqueous solution of water-soluble manganese salts such as silver nitrate and manganese nitrate, followed by drying and heating and oxidizing the coprecipitate. Alternatively, silver and manganese precipitates may be separately produced by the above-described method, and these may be kneaded, dried and then heated and oxidized. Oxalic acid is also obtained by the method of mixing, kneading and thermally decomposing silver oxide, such as silver carbonate, silver nitrate, manganese salts such as manganese nitrate, manganese oxalate, and manganese nitrate, or by kneading and kneading.

These catalysts are finally obtained by heat-treating in the presence of air at 200 degreeC or more and 900 degrees C or less, Preferably it is 300-600 degreeC.

The catalyst of the present invention may contain at least one precious metal selected from the group VIII of the periodicity of elements, such as iron, cobalt, nickel, copper, vanadium, zinc, platinum, and palladium, in addition to silver and manganese as active ingredients. However, it is preferable that the content is 1 atom or more and 10 atom% or less of an active ingredient. This is because, for example, when cobalt is contained in an amount of 10 atomic% or more, AgCoO ₂ is formed in a crystallized state and the activity of the catalyst is lowered. There is no effect unless it contains 1 atomic% or more.

Co is CoO or Co ₃ O ₄ , Fe is Fe ₂ o ₃ , Ni is NiO, Cu is CuO or Cu ₂ O, V is V ₂ O ₅ , Zn is ZnO, Pd is PdO or Pd, Pt is Pt Mainly exists.

The silver element of the Ag / Mn bicomponent catalyst thus prepared forms oxygen or oxygen and manganese elements and compounds. That is, silver does not precipitate in a metal state, but is in an oxidized state as an electronic state. Usually, in the case of a single catalyst, since Ag ₂ O releases oxygen at about 350 ° C. or more, it precipitates as Ag at a preferable heat treatment temperature of 300 ° C. to 600 ° C. of the present invention. However, the catalyst of the present invention preserves this silver as an oxidized state because manganese oxide is in an oxide having a smaller number of oxidation than that of Mn0 ₂ , which is normally stable, that is, less than +4. As a result, it becomes highly active in the oxidation reaction, and silver is highly dispersed in the catalyst to suppress aggregation of the particles.

The compound form of silver and manganese element of a catalyst is identified by powder X-ray diffraction (XRD), and the electronic state (atomic state) is identified by general analysis methods, such as X-ray photoelectron spectroscopy (XPS).

The catalyst which consists of an oxide containing silver and manganese as the main component of the present invention can be used alone, but is used by being supported on a porous carrier such as alumina, titanium, zeolite, ceramic carrier such as cordierite, and metal carrier such as SUS. It is preferable to make it, and thereby, the catalyst performance is fully exhibited. Moreover, after supporting on the said support | carrier, you may carry this again on a base material, such as ceramics and a metal, by coating or the like.

These catalysts are prepared by mixing the silver and manganese precipitates obtained by the above-described method, or the oxides or silver and manganese salts after heat treatment with a carrier or precursor precursor such as alumina, titanium or the like, followed by heat treatment or alumina. And heat treatment after coating on a ceramic carrier or metal carrier such as titanium. The mixed aqueous solution of water-soluble silver salt and manganese salt may be impregnated or applied to a ceramic carrier or a metal carrier, followed by drying and heat treatment to precipitate a catalyst containing silver and manganese as a main component.

As the shape of the catalyst produced by the above method, pellets, honeycomb phases, sheet phases, plate shapes, three-dimensional foams or the like in which the powder is molded are applied.

The catalyst of the present invention is a catalyst containing silver and manganese as a main component, containing silver in the form of silver oxide or oxide of silver and manganese, containing manganese in the form of manganese oxide or oxide of manganese and silver, It also contains manganese oxides with valences less than four. Manganese oxide is mainly present in the form of Mn ₂ O ₃ , MN ₃ O ₄ or mixtures thereof. Some of the silver in the catalyst forms complex oxides with manganese. The shape of the complex oxide depends on the heat treatment temperature, and may be any one of AgMn ₂ O ₄ , AgMnO ₂ , AgMnO ₄ , AgMnO, Ag ₂ MnO, Ag ₂ MnO ₂ , Ag ₂ Mn ₈ O ₁₆ , or a mixture thereof. . In particular, it is preferred that the form of AgMn ₂ O _4, AgMnO _2.

By the combination of silver and manganese, the oxidation state of silver can be preserved, silver is highly dispersed, aggregation is suppressed, and a complex oxide is mixed with manganese oxide thereon, and silver is highly dispersed, so that the catalyst exhibits high activity. The oxidation state of silver is preserve | saved by making manganese oxide into the oxidation state less than four. Since the composite oxide of silver and manganese is mixed with manganese oxide, crystal growth of the composite oxide can also be suppressed.

Not all of the silver in the catalyst is in the form of a compound, and some of the silver may be present in the form of silver. This is because they are mixed in manganese oxide and they are thermally saddleed and highly active than are present alone.

The catalyst of the present invention is particularly effective for deodorizing low concentrations of harmful and odorous gases containing various components generated when cooking food in an oven, grill, or microwave oven.

In the case of using the catalyst of the present invention for such a purpose, foods such as gas exhaust passages, their inlets and outlets, where gas containing odorous components generated during cooking are in contact with each other, such as ovens, grills, and stoves. It is desirable to install in places where there is no problem in cooking.

The catalyst of the present invention acts effectively at reaction temperatures of room temperature or higher, preferably 100 ° C. or higher and 300 ° C. or lower. Depending on the cooking temperature, there may be times when the gas temperature containing the odor generated does not correspond to this temperature, but in such a case, it is desirable to preserve the temperature range in which the catalyst works effectively by installing a heater or the like.

Referring to the drawings of the present invention, FIG. 1 shows the relationship between the removal rate of acetaldehyde and the silver content in the active component when catalytic combustion of acetaldehyde using the catalyst according to Example 1 and the catalyst according to the comparative example of the present invention. FIG. 2 is a graph showing the relationship between the acetaldehyde removal rate of catalytically burning acetaldehyde using the catalysts of Examples 3, 4, 5 and Comparative Example 1 and the silver content in the active ingredient, and FIG. 7 to 7 are X-ray diffraction patterns of the catalysts according to the examples and comparisons of the present invention, and FIG. 8 is acetaldehyde at the reaction temperatures of Examples 6, 7, 8 and Comparative Examples 4, 5 and 6 catalysts. And trimethylamine removal rate, FIG. 9 is a diffractogram showing the X-ray diffraction pattern of the catalyst of Example 9, and FIG. 10 is acetal using the catalyst of Examples 7, 11 and the catalyst of Comparative Example 7. It is a graph which shows the relationship between the acetaldehyde removal rate and reaction temperature at the time of catalytic combustion of a hydroxide, and FIG. 11 is the methyl mercaptan removal rate and reaction temperature at the time of catalytic combustion of methyl mercaptan using the catalyst of Example 7. This graph shows the relationship with.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited to these Examples.

Example 1

2.276 g of silver nitrate and 40.436 g of manganese nitrate hexahydrate were dissolved in distilled water to obtain 300 ml. This mixed aqueous solution is uniformly absorbed into 500 g of γ-alumina of granular (2-4 ψ). After drying this at 120 degreeC, it heat-processed at 500 degreeC for 2 hours in air atmosphere, and it was set as (gamma) -alumina support Ag / Mn catalyst. At this time, the composition ratio of the active ingredient Ag / Mn is Ag: Mn = 10: 90 (silver content of 10 atomic%), and the supporting amount of the active ingredient is 2% by weight based on the carrier after 500 ° C heat treatment. In the same manner, a gamma -alumina-supported Ag / Mn catalyst having an Ag / Mn composition ratio (atomic ratio) of Ag: Mn = 20: 80, 30:70, 40:60, 50:50, and 70:30 was prepared. In the same manner, a γ-alumina dodge catalyst of 100% Mn and 100% Ag was also prepared. In FIG. 1, the odor component acetaldehyde reaction rate is shown in reaction temperature 200 and 250 degreeC with respect to the silver content of these catalysts. The composite effect of silver and manganese is expressed in the range of silver content of 50% or less, and the activity of a manganese single catalyst increases by addition of a small amount of silver.

Example 2

8.4935 g of nitric acid and 129.168 g of manganese nitrate hexahydrate were dissolved in distilled water to obtain 1500 ml. To this mixed aqueous solution was added dropwise to pH = 9 while stirring ammonia water diluted with distilled water of twice the volume. The produced precipitate was gradient filtered, washed, suction filtered and dried at 120 ° C. This was baked at 500 ° C. for 2 hours. The powder was press-molded and classified into 10-20 meshes to obtain an Ag / Mn binary catalyst. The composition ratio (atomic ratio) of this catalyst is Ag: Mn = 10: 90.

Example 3

Except for using 16.987 g of nitric acid and 114.816 g of manganese nitrate hexahydrate, all were prepared in the same manner as in Example 2 to obtain an Ag / Mn binary catalyst having a composition ratio (atomic ratio) of Ag: Mn = 20: 80.

Example 4

Except for using 24.4805 g of nitric acid and 100.464 g of manganese nitrate hexahydrate, all were prepared in the same manner as in Example 2 to obtain an Ag / Mn bicomponent catalyst having a composition ratio (atomic ratio) of Ag: Mn = 30: 70.

Example 5

Except for using 33.974 g of nitric acid and 114.816 g of manganese nitrate hexahydrate, all were prepared in the same manner as in Example 2 to obtain an Ag / Mn binary catalyst having a composition ratio (atomic ratio) of Ag: Mn = 50: 50.

Example 6

29.3 g of silver nitrate and 97.6 g of manganese nitrate hexahydrate were dissolved in distilled water to obtain a mixed aqueous solution of 400 cc. (Gamma) -alumina honeycomb with a specific surface area of 150 m <2> / g and 100 cell / inch <^2> was precipitated in this mixed aqueous solution for 2 minutes, and it dried at 120 degreeC, and heat-processed at 500 degreeC for 1 hour. This operation was performed twice to obtain a catalyst finished product. Ag: Mn (atomic ratio) of this catalyst is 30:70.

Example 7

A catalyst was prepared in exactly the same manner as in Example 6 except that 8.90 g of nitric acid and 134.4 g of manganese nitrate hexahydrate were used. Ag: Mn of this catalyst is 10:90.

Example 8

5.31 g of nitric acid, 80.4 g of manganese nitrate hexahydrate, 250 m 2 / g of specific surface area, 100 g of gamma -alumina powder, and 400 cc of distilled water were kneaded for about 1 hour. This slurry was dried at 120 degreeC, and then baked at 500 degreeC for 2 hours.

This oxide was classified into 200 mesh or less, the binder and distilled water were added, and it was set as the slurry. This slurry was coated on 100 cells / inch ² of cordierite honeycomb, dried at 120 ° C, and calcined at 500 ° C for 2 hours.

Comparative Example 1

Except for using silver nitrate and using 143.52 g of manganese nitrate hexahydrate, all were prepared in the same manner as in Example 2 to obtain a manganese oxide single catalyst.

Comparative Example 2

85 g of silver nitrate was calcined at 500 ° C. for 2 hours, the powder obtained was pulverized, press-molded and classified into 10-20 mesh to obtain an Ag single catalyst.

The malodor component acetaldehyde reaction rates of the catalysts of Examples 3, 4, 5 and Comparative Example 1 were measured. 2 shows a reaction rate of 100 and 125 ° C. with respect to the silver content. As in the case of FIG. 1, the activity compared to the manganese single catalyst of Comparative Example 1 was significantly increased at a silver content of 50 atomic% or less, and showed a maximum at a silver content of 10 atomic%.

Comparative Example 3

Except for using 67.94 g of nitric acid and 57.40 g of manganese nitrate hexahydrate, all were prepared in the same manner as in Example 2 to obtain an Ag / Mn binary catalyst having a composition ratio (atomic ratio) of Ag: Mn = 67: 33.

The powder X-ray diffraction patterns of Comparative Examples 1, 2, 3 and Examples 2, 4 are shown in FIGS. 3 to 7. FIG. 3 is that of the catalyst of Comparative Example 1, FIG. 4 is of Comparative Example 2, FIG. 5 is of Comparative Example 3, FIG. 6 is of Example 2, and FIG. 7 is of Example 3. The manganese single catalyst shown in Comparative Example 1 is MnO ₃ , and the silver single catalyst shown in Comparative Example 2 is a crystalline form of Ag (metal state). In this embodiment from the XRD pattern of Example 3 it was recognized for some of the peaks of Mn ₃ O ₄ of the peak and Ag ₂ O. In the Ag / Mn bicomponent storage, it has a crystalline form different from that of a single catalyst due to a complex effect. In order to know the detailed valence state, the binding energy of silver and manganese atoms was measured by X-ray photoelectron spectroscopy. Example 2 The manganese atoms of the catalyst are in a slightly lower energy state than Mn ₂ O ₃ and lower than hydrogen oxide +3 as the whole catalyst. In addition, it can be described as the +1 from that of the energy state such as atomic Ag ₂ O oxidation number. However, since the peak intensity of Ag ₂ O in the XRD pattern of FIG. 3 is weak, it is also assumed that the silver atom forms a complex oxide with manganese. In the XRD pattern of Example 4 shown in FIG. 3, the peaks of Mn ₃ O ₄ and AgMn ₂ O ₄ were recognized, and the presence of the complex oxide predicted in Example 2 was confirmed. According to the XRD pattern of Comparative Example 3 shown in FIG. 3, silver is precipitated in the metal state in the composition with many silver content rates in which the composite effect is not expressed in the result of Example 1 of FIG. Being in an oxidized state is one of the reasons for high activation.

[Comparative Example 4]

A silver catalyst was produced in exactly the same manner as in Example 6 except that 79.41 g of nitric acid was used and no manganese nitrate hexahydrate was used.

[Comparative Example 5]

A manganese oxide catalyst was prepared in the same manner as in Example 7 except that silver nitrate was not used and 183.27 g of manganese nitrate hexahydrate was used.

Comparative Example 6

Ammonia water was added dropwise to a solution in which 47.2 g of silver nitric acid was dissolved in 1 L of distilled water, and the resulting sol was filtered, dried, and calcined at 500 ° C. for 2 hours to obtain a catalyst powder. Further, ammonia water was added dropwise to a solution in which 75.6 g of manganese nitrate hexahydrate was dissolved in 1 L of distilled water, and the resulting sol was filtered and dried and calcined at 500 ° C. for 2 hours to obtain manganese oxide. Γ-alumina powder having a specific surface area of 250 m 2 / g between the silver catalyst and manganese oxide was mixed and wet kneaded in a weight ratio of 3: 7: 90. It was press-molded after drying, it classified into 40-68 mesh, and it was set as the catalyst. From the X-ray diffraction of the catalyst was recognized that the peak of γ- alumina, Ag, MnO _2.

As mentioned above, with respect to the catalyst of Example 6, Example 7, Example 8, Comparative Example 4, Comparative Example 5, and Comparative Example 6, SV: 3000h- ¹ , Reaction gas: 60 ppm of acetaldehyde, 60 ppm of trimethylamine, air bass Under the conditions, the removal rate in reaction temperature 100, 200, and 300 degreeC was measured. The result is shown in FIG.

The catalysts of Examples 6, 7, and 8 have a higher removal rate than the catalysts of Comparative Examples 4, 5, and 6, and particularly have a high performance between 100 and 300 ° C. Therefore, even if the temperature of the malodorous gas generated is low, it shows effective catalyst performance. In addition, in the case of a system in which a malodorous gas or a catalyst body is heated by a heater or the like and the reaction temperature is kept high, the gas may not be slipped even in the case of a low temperature during the heat raising, and the effect can be exerted.

Example 9

25.48 g of nitric acid and 43.06 g of manganese nitrate hexahydrate were dissolved in 2 L of distilled water to obtain a mixed aqueous solution. The ammonia water diluted with distilled water of 2 times volume was dripped at the said mixed aqueous solution, stirring, and precipitation was produced | generated. The precipitate was washed twice by gradient filtration, suction filtered, and dried at 120 ° C. This was calcined at 300 ° C. for 2 hours to obtain a catalyst.

The obtained catalyst was analyzed by powder X-ray diffraction. The result is shown in FIG. 9 as an X-ray diffraction pattern. In FIG. 9, X represents a peak peculiar to Mn ₂ O ₃ , and ▼ represents a peak peculiar to AgMn ₂ O ₄ . This shows that this catalyst contains manganese oxide, a complex oxide of silver, and manganese.

Example 10

Coating slurry was prepared as in Example 9, using 68.66 g of manganese nitrate tetrahydrate instead of manganese nitrate hexahydrate. This was coated on a gold network of SUS sprayed with alumina, dried, and calcined at 500 ° C. for 2 hours. 22 sheets of this gold network catalyst were piled up and the removal rate in reaction temperature 250 degreeC was measured on condition of SV: 30000h <^-1> , reaction gas: 50 ppm of acetaldehyde, 50 ppm of trimethylamine, and an air base. At this time, acetaldehyde was 80% and trimethylamine was 90% removal. Since the gold-type catalyst has a higher thermal conductivity than a catalyst composed only of oxide, it is also effective in a system type in which the temperature of the catalyst layer rises rapidly by the reaction gas, the heater or the like.

Example 11

A catalyst was prepared in the same manner as in Example 6 except that 8.9 g of nitric acid, 134.4 g of manganese nitrate, and 13.265 g of cobalt nitrate were used. The atomic ratio of Ag: Mn of this catalyst was 10:90 and the% of Co atom in the total atoms of Ag, Mn, and Co was 8%.

Comparative Example 7

A catalyst was prepared in the same manner as in Example 6 except that 8.9 g of nitric acid, 134.4 g of manganese nitrate, and 138.472 g of cobalt nitrate were used. The atomic ratio of Ag: Mn of this catalyst was 10:90, and the percentage of Co atoms in the total atoms of Ag, Mn, and Co was 50%.

Fig. 10 shows the results of measuring the acetaldehyde removal rate under the same experimental conditions in which the data of Fig. 8 were obtained for the catalysts of Examples 7, 11 and Comparative Example 7. In Example 11, which is a catalyst containing 8 atomic% of Co mixed in Example 7, the activity is almost unchanged as compared with Example 7. By the way, in Comparative Example 7, in which Co atoms were mixed in Example 7, and the content thereof was 50 atomic%, the activity was inferior to that in Example 7. Performed using the catalyst of Example 7 were measured in SV = 30000h ^-1, reaction gas methyl mercaptan (CH ₃ SH) removal rate in the reaction temperatures 100, 200, 300 ℃ under the conditions of 60ppm air base. The result is shown in FIG.

The removal rate is 80% at the reaction temperature of 100 ° C., and high activity is exhibited at low temperature.

Claims (9)

A catalyst for oxidizing or decomposing a gas containing an odor component in the presence of oxygen to be harmless, wherein the active component is supported on a carrier, and silver and manganese are used in an atomic ratio of silver as the active component; manganese = 5: 95-50: Contained in a ratio of 50, silver in the form of a compound with oxygen, a compound with oxygen and manganese or a mixture thereof, manganese in the form of a compound with oxygen, a compound with oxygen and silver or a mixture thereof, A catalyst for oxidation and decomposition of a gas containing an odor component, characterized by containing manganese oxide having a valence of less than 4. The catalyst for oxidation and decomposition of a gas containing an odor component according to claim 1, wherein the specific surface area of said carrier is in the range of 0.5 to 1000 m 2 / g. The catalyst for oxidation and decomposition of a gas containing an odor component according to claim 1, wherein the carrier is one selected from gamma -alumina, TiO ₂ and zeolite. The catalyst for oxidation and decomposition of a gas containing an odor component according to claim 1, wherein the catalyst contains at least one of manganese oxides in the form of Mn ₂ O ₃ and Mn ₃ O ₄ . A catalyst for oxidizing or decomposing gas containing an odor component in the presence of oxygen and detoxifying it. The active component is supported on a carrier, and these are coated on a substrate having a honeycomb shape, a plate shape or a gold mesh shape, which are made of ceramics or metal. Containing silver and manganese in an atomic ratio of silver; manganese = 5: 95-50: 50 as the active ingredient, and silver is in the form of a compound with oxygen, a compound with oxygen and manganese, or a mixture thereof; Manganese is in the form of a compound with oxygen, a compound with oxygen and silver, or a mixture thereof, and contains a manganese oxide having a valence of less than four. A catalyst for oxidizing or decomposing a gas containing an odor component in the presence of oxygen, and detoxifying the carrier, and supporting the active ingredient on a carrier, whereby silver and manganese are used in an atomic ratio of silver; manganese = 5: 95-50: Contained in a ratio of 50, silver in the form of a compound with oxygen, a compound with oxygen and manganese or a mixture thereof, manganese in the form of a compound with oxygen, a compound with oxygen and silver or a mixture thereof, Containing a manganese oxide having a valence of less than 4, wherein the active ingredient is a mixture of silver salts, silver oxide or mixtures thereof with manganese salts, manganese oxides or mixtures thereof, and finally at the temperature of 200 ° C. to 900 ° C. A catalyst for oxidation and decomposition of a gas containing an odor component, which is obtained by heat treatment under the following conditions. A catalyst for oxidizing or decomposing gas containing an odor component in the presence of oxygen and detoxifying it. The active component is supported on a carrier, and these are made of ceramics or metals and coated on a substrate having a honeycomb shape or a plate shape or a gold mesh shape. Containing silver and manganese in an atomic ratio of silver; manganese = 5: 95-50: 50 as an active ingredient; and silver is in the form of a compound with oxygen, a compound with oxygen and manganese, or a mixture thereof , Manganese in the form of a compound with oxygen, a compound with oxygen and silver, or a mixture thereof, containing manganese oxide having a valence of less than 4, wherein the active ingredient is a silver salt, silver oxide or a mixture thereof and manganese salt, manganese oxide Or a mixture of these and finally obtained by heat treatment in the presence of air at a temperature of 200 ° C. or more and 900 ° C. or less. Oxidation of a gas containing a new component, the catalyst for the decomposition. A catalyst for oxidizing or decomposing a gas containing an odor component in the presence of oxygen and making it harmless, and containing silver and manganese in an atomic ratio of silver as an active component; manganese = 5: 95-50: 50; In the form of a compound with oxygen, a compound with oxygen and manganese, or a mixture thereof, manganese in the form of a compound with oxygen, a compound with oxygen and silver, or a mixture thereof, containing manganese oxide having a valence of less than 4 A catalyst for oxidation and decomposition of a gas containing an odor component. A catalyst for oxidizing or decomposing gas containing an odor component at a temperature of 300 ° C. or lower, or room temperature or higher in the presence of oxygen, and carrying an active ingredient on an inorganic oxide carrier, wherein silver and manganese are used as an active ingredient in an atomic ratio. Silver; manganese = 5: 95-50: 50, and silver is in the form of a compound of oxygen, a compound of oxygen and manganese, or a mixture thereof, and manganese of a compound of oxygen, of oxygen and silver A catalyst for oxidation and decomposition of a gas containing an odor component, which is in the form of a compound or a mixture thereof and contains manganese oxide having a valence of less than 4.