JPH10290933A - Deodorization catalyst, deodorization filter using the same and deodorizer using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance deodorizing efficiency for a malodorous gas and to improve durability by carrying a specified amt. of a mixture of oxides of Mn and Cu as catalytically active components on the surface of a powdery carrier contg. one or more among aluminum silicate contg. γ-alumina, silica and zeolite, silica, titania, etc. SOLUTION: A powdery carrier contg. one or more among aluminum silicate contg. γ-alumina, silica and zeolite, silica, titania, etc., is dispersed in water and mixed to prepare a slurry. An Mn salt such as manganese nitrate, manganese sulfate or manganese chloride and a Cu salt such as copper nitrate or copper chloride are added to the slurry by 1-20 pts.wt. (expressed in terms of oxides) based on 100 pts.wt. of the carrier and they are mixed and dried. The resultant dry powder is heat-treated at a prescribed temp. to obtain the objective deodorization catalyst. When this catalyst is used, high deodorizing ability is ensured at a low temp. of about <=100 deg.C, SOx and NOx are not generated, environmental pollution is prevented and energy is saved. High deodorizing ability can be ensured immediately after the beginning of deodorization.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst for deodorizing and purifying odors and exhaust gas (odors from toilets, garbage, etc.) discharged from homes and factories, a deodorizing catalyst-supporting filter using the catalyst, and a filter therefor. The present invention relates to a deodorizer using a filter.

[0002]

2. Description of the Related Art In recent years, with the modernization of buildings, the spread of air conditioning, and the advancement of technology, as airtightness in rooms and interiors of automobiles has advanced, trace amounts of materials such as body odor, bad breath, and building materials that have not been noticed before have been generated. It has a problem that it is sensitive to odor and gives discomfort. In addition, at present, as environmental problems are social problems, there is a strong demand for a more comfortable and safe air quality environment, especially a smell-free living environment, in order to realize a comfortable and rich living environment. Furthermore, many women, especially women, have a strong aversion to the smell of the toilet after using it.

[0003] In order to solve these problems, various deodorizing techniques and deodorizing apparatuses have been developed mainly for toilet deodorizers and put on the market. For example, many household deodorizers that are widely used at home use physical adsorption methods and ozone oxidation methods. The physical adsorption method is a method of deodorizing by adsorbing odor molecules on activated carbon or the like. The ozone oxidation method is a method of decomposing odor molecules using ozone and an ozone decomposition catalyst. Industrial deodorizers include a catalytic oxidation method in addition to the above methods. In the catalytic oxidation method, a deodorizing catalyst is heated by an external heater or the like to activate the catalyst and decompose odor molecules.

[0004] Recently, in order to decompose malodors at low temperatures, developments have been made to increase the activity of the catalyst. JP-A-4-135623 and JP-A-4-150945 disclose that MnO ₂ contains 70 to 90% by weight and CuO contains 10 to 90% by weight.
A single deodorizing catalyst consisting of 30% by weight is disclosed.
It describes a method of decomposing malodor by applying a temperature of preferably 105 to 150 ° C. to the catalyst.

[0005]

However, the above-mentioned conventional deodorizing catalyst, deodorizing catalyst filter, and deodorizer have the following problems. 1) A deodorizer using the physical adsorption method has a fatal defect of lack of durability because it deodorizes by adsorbing odor molecules on activated carbon or the like, and further lacks a removal ability for removing nitrogen-based odor. There is.

2) A deodorizer using the ozone oxidation method uses ozone that is harmful to the human body and thus lacks safety. Further, since an ozone generator (ozonizer) is required, the device cannot be made large and compact. There was a problem that the life of the ozone decomposition catalyst was short and labor was required for maintenance. Further, the deodorizing ability is affected by humidity, and it is difficult to stably deodorize.

[0007] 3) The deodorizer using the oxidation catalyst method heats the deodorization catalyst with an external heater or the like to activate the catalyst and decompose odor molecules.
It requires a large amount of heat to heat the catalyst, lacks energy savings, and takes a long time to heat the catalyst, resulting in low initial deodorizing ability.

Further, since a high temperature is added, SOx and NOx
Occurs. Further, since the control section of the heater is complicated, the shape of the apparatus becomes large and it is difficult to make the apparatus compact.

4) In addition, the deodorizing catalyst and the deodorizing method using the same disclosed in JP-A-4-135623 and JP-A-4-150945 require that the deodorizing catalyst be heated to 100 ° C. or higher. The heater capacity is large and lacks energy saving, and the heat-resistant structure requires many man-hours for manufacturing, and it is difficult to reduce the size.

The present invention solves the above-mentioned conventional problems, and provides a deodorizing catalyst having high deodorizing efficiency and excellent durability against malodorous gas having various components, and has high catalytic activity and excellent energy saving and safety. It is an object of the present invention to provide a deodorizing filter having excellent deodorization properties and a deodorizer using the deodorizing filter, which is compact, has high deodorizing efficiency, and can be mass-produced at low cost.

[0011]

In order to solve this problem, a deodorizing catalyst of the present invention comprises a catalyst on a surface of a carrier powder containing at least one of γ-alumina, aluminum silicate containing zeolite, silica, titania and the like. Mn and C as active ingredients
has a configuration in which 1 to 20 parts by weight of the oxide of u is supported, whereby an appropriate amount of the active component Mn-Cu oxide is supported on a carrier powder having a high specific surface area such as γ-alumina and zeolite. By doing so, a strong deodorizing ability can be provided at a low temperature of 100 ° C. or less. In addition, Mn-Cu oxides can be manufactured at lower cost and higher quality than platinum-based catalysts. Further, Mn
When ZrO ₂ is added to the —Cu oxide, it has the effect of increasing the supply amount of oxygen, improving the deodorizing efficiency, and improving the resistance to sulfur compounds.

A deodorizing filter according to the present invention is characterized in that the deodorizing catalyst according to any one of claims 1 to 3 is applied to a fibrous honeycomb structure mainly made of inorganic fibers or a honeycomb structure mainly made of PTC ceramics. It has a configuration in which it is carried. This makes it easy to carry many catalysts,
Since the contact area with the odorous gas increases, the deodorizing efficiency can be increased. Further, since the fibrous honeycomb structure has a high porosity, the number of deodorizing filters can be reduced. PTC
When using a honeycomb structure made of ceramics,
With a simple structure, the temperature of the catalyst can be raised to a certain temperature in a short period of time, so that the catalyst characteristics can be improved.

The deodorizer of the present invention comprises a container having a gas inlet and a gas outlet, a fibrous pre-filter disposed downstream of the gas inlet in the container, and a downstream of the pre-filter. A deodorizing catalyst filter according to claim 4 or 5, and a fan disposed downstream of the deodorizing catalyst filter. As a result, it is possible to efficiently decompose and remove odors emitted from homes, reduce manufacturing costs, and reduce the size.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The deodorizing catalyst according to the first aspect of the present invention is characterized in that a carrier powder containing at least one of γ-alumina, silica, aluminum silicate salt containing zeolite, silica, titania and the like is used. It has a configuration in which 1 to 20 parts by weight of a combined oxide of Mn and Cu as a catalytically active component is supported on 100 parts by weight of the powder.

Thus, a carrier powder having a high specific surface area, such as γ-alumina or zeolite, is added to the active ingredient Mn-C.
By carrying an appropriate amount of u, a strong deodorizing ability can be provided at a low temperature of 100 ° C. or lower. This has the effect of realizing a deodorizing catalyst having a high deodorizing ability at a lower cost than a platinum-based catalyst.

According to a second aspect of the present invention, there is provided the deodorizing catalyst according to the first aspect, wherein the catalytically active component comprises Mn and Mn ₂ O _3.
10 to 70 wt%, preferably 20 to 60 wt%
%, And 30 to 90 wt%, preferably 80 to 40 wt% in terms of Cu converted to CuO.

This has the effect that a high deodorizing efficiency can be obtained by the synergistic effect of both catalytically active components.

Here, Mn is 10 wt% or less and Cu is 9 wt%.
0 wt% or more, Mn is 70 wt% or more, Cu is 30 w
When the content is less than t%, the deodorizing efficiency tends to decrease, which is not preferable.

Next, a method for producing a Mn—Cu-based oxide deodorizing catalyst will be described. Alumina, silica, aluminum silicate salt containing zeolite, a step of adding and dispersing and adding water to at least one or more carrier powders such as titania,
Manganese nitrate, manganese sulfate, manganese chloride and other Mn salts and copper nitrate and copper salts such as manganese chloride are converted into oxides and 1-20 parts by weight of the dispersion slurry are added to the carrier powder and dispersed and mixed. , A step of drying water and a step of heat-treating the obtained dry powder at 350 to 550 ° C.

Here, as the heat treatment temperature becomes lower than 350 ° C., it tends to be difficult to bend out as Mn—Cu oxide. As the heat treatment temperature exceeds 550 ° C., the surface area of the carrier powder becomes smaller and the deodorizing efficiency decreases. Any of these tend to be undesirable.

It is desirable to select a carrier powder having a large specific surface area in order to widely and uniformly disperse and support catalytically active components such as Mn and Cu and to increase a reaction area. In addition, in order to form a catalytically active component layer on the surface of the carrier powder, the carrier powder is immersed in an aqueous solution of the catalytically active component or the like and supported on the surface. By making the catalytically active component fine, the specific surface area as a catalyst increases,
The catalyst activity increases. 1-20 parts by weight, preferably 3-20 parts by weight of the oxide of the catalytically active components Mn and Cu with respect to the carrier powder
Deodorizing effect appears by adding 15 parts by weight. If the amount is less than 1 part by weight, a sufficient deodorizing effect cannot be obtained. If the amount exceeds 20 parts by weight, the catalytically active component tends to be saturated with respect to the surface of the carrier powder.

The deodorizing catalyst according to claim 3 of the present invention is the deodorizing catalyst according to claim 1 or 2, wherein
The composition is such that 5 to ₂₀₀ parts by weight, preferably 30 to 150 parts by weight, is added when r is converted to ZrO2.

As a result, the supply of oxygen is activated by the catalytic action, and the oxidation reaction proceeds smoothly, and at the same time, the deodorizing efficiency is improved and the sulfur resistance can be improved.

Here, when Zr is converted to ZrO ₂ , the catalyst activity tends to be hardly obtained as the amount becomes less than 30 parts by weight, and the deodorizing efficiency tends to decrease as the amount exceeds 150 parts by weight. Both are not preferred because they are recognized. Below, the addition amount is small, no effect is exhibited and 2
If the amount is more than 00 parts by weight, the deodorizing efficiency tends to decrease, which is not preferable.

Next, the method for producing the Mn-Cu-Zr-based oxide deodorizing catalyst of the present invention will be described below.

A step of adding at least one kind of carrier powder such as alumina, silica, zeolite-containing aluminum silicate salt, or titania to water and dispersing and mixing; and adding Mn such as manganese nitrate, manganese sulfate and manganese chloride to the dispersion slurry. The salt is converted to Mn ₂ O ₃ at 10 to 70 wt%, and the Cu salt such as copper nitrate or copper chloride is converted to CuO at 90 to 30 watts.
a step of mixing and dispersing added t%, 5 in outer percentage relative to the catalytically active component of the conversion to claims 1 and 2, wherein the Zr salt such as zirconium nitrate to the slurry to _{ZrO 2 (Mn 2 O 3 -CuO} ) To 200 parts by weight, mixing and dispersing, drying the water, and drying the dried powder obtained in the above step for 350 minutes.
Obtained in the step of heat treatment at で 550 ° C.

[0027] The deodorizing filter according to claim 4 of the present invention provides a fibrous honeycomb structure mainly composed of inorganic fibers,
A deodorizing catalyst according to any one of claims 1 to 3 is supported.

Thus, since the fibrous honeycomb structure is used as a skeleton, the porosity and the surface area of the structure itself are large, so that the deodorizing catalyst can be easily carried, and a large number of deodorizing catalyst components can be uniformly carried. This has the effect that a high-performance deodorizing filter can be obtained. In addition, since the porosity is large, there is an effect that the weight can be reduced.

Next, a method for producing the deodorizing filter according to the present invention will be described below. Alumina, alumina-silica, a step of preparing a ceramic sheet using inorganic fibers such as silica and inorganic binder such as clay using a papermaking method, and corrugating the ceramic sheet in the same manner as in the production of corrugated paper, Forming a corrugated sheet and alternately stacking the flat and corrugated sheets to obtain a honeycomb formed body; heat treating the honeycomb formed body at a temperature at which the inorganic binder is sintered to obtain a honeycomb structure; 3) a step of dispersing the deodorizing catalyst according to any one of (1) to (3) in water, a step of impregnating the honeycomb structure with the deodorizing catalyst dispersion and supporting the deodorizing catalyst, and drying the honeycomb structure after impregnation Obtained.

The deodorizing filter according to claim 5 of the present invention is a porous PTC ceramic honeycomb structure mainly made of PTC ceramics, and has an insulating layer made of at least one of alumina and silica on its surface. Is formed, and the deodorizing catalyst according to any one of claims 1 to 3 is supported on the surface of the insulating layer.

Thus, a constant temperature can be quickly added to the deodorizing catalyst filter with a compact structure, and the deodorizing characteristics can be improved.

Here, the PTC ceramic structure was used.
The material composition of PTC ceramics
-It is almost the same as that used for the
Barium titanate (BaO / TiO_Two) As the main raw material
Yttrium oxide (Y_TwoO _ThreeOxidation of rare earth elements such as
And barium in barium titanate
Part of (Ba) is strontium (Sr) or lead (Pb)
A solid solution obtained by partially displacing the solid solution is used. Titanic acid
The addition amount of barium additive is PTC ceramic structure.
Depending on the purpose of use of the structure, it is one of the additives
Some Y_TwoO_Three0.1 to 0.3 mol% is preferable
Used. Y_TwoO_ThreeWithin the above-mentioned range
Greatly improves the rate of change of the specific resistance of the PTC structure
be able to. In addition, a predetermined amount of the Sr compound is added.
Lowers the Curie temperature (Tc) (from 120 to -30).
° C). Further, a Pb compound is added.
High Tc (120-250 ° C)
Can be. When the deodorizing catalyst of the present invention is used, Tc is
PTC ceramics below 100 ° C are suitable
Used.

The additive of the pore-forming agent is selected depending on the strength, porosity, etc. of the PTC ceramic structure. The PTC ceramic carrier desirably has a large specific surface area and a porous cell wall. By increasing the specific surface area of the PTC ceramic structure, the amount of the catalytically active component carried can be increased. Further, by making the cell walls of the PTC ceramic structure porous, many catalytically active components can be supported. This deodorizing catalyst is P
The catalytic activity is increased by the heat generated by the TC ceramics, and a higher deodorizing effect (decomposition of malodor) than at room temperature is exhibited.

On the other hand, for the insulating layer, γ-alumina or amorphous silica is used. By coating these on the surface of the PTC honeycomb carrier, the specific surface area can be further increased, and the catalytic activity becomes higher by that amount.
Direct contact between the C ceramic structure and the catalytically active component can be prevented. If this insulating layer is not provided,
The catalytically active component directly contacts the PTC ceramic structure,
The catalytically active component penetrates to show conductivity and PTC
An increase in the resistance value near Tc of the ceramic is suppressed, the thermistor characteristics are not exhibited, and the temperature cannot be controlled.

Next, the method for producing the deodorizing catalyst filter of the present invention will be described below. Methylcellulose thickener, organic plasticizer, PTC ceramic powder
A step of adding and mixing water, an additive such as a polymer-based pore-forming agent, a step of kneading the mixture using a kneading machine, a step of forming the mixture using a vacuum extruder, and a step of drying. About 1250 ° C to 1380 ° C, preferably 1300 ° C
A step of obtaining a porous PTC honeycomb structure by firing before and after, a step of forming an insulating layer with alumina sol or the like,
A step of dispersing the deodorizing catalyst according to any one of claims 1 to 3 in water, a step of impregnating the catalyst dispersion with a PTC honeycomb structure, and supporting the catalyst; Drying the honeycomb structure, and then
It is obtained in the step of forming ohmic electrodes on both end surfaces of the opening of the PTC honeycomb structure.

A deodorizer according to claim 6 of the present invention is a container having a gas inlet and a gas outlet, a fibrous prefilter disposed downstream of the gas inlet in the container, and a prefilter. A deodorizing catalyst filter according to claim 4 disposed downstream of the deodorizing catalyst filter, and a fan disposed downstream of the deodorizing catalyst filter. This has the effect that a deodorizer having extremely high deodorization efficiency, light weight and excellent durability can be realized.

Hereinafter, embodiments of the present invention will be described in detail. (Embodiment 1) A deodorizing catalyst comprising a Mn-Cu-based oxide will be specifically described.

Manganese nitrate hexahydrate and copper nitrate trihydrate were added to 30 g of γ-alumina in terms of the respective oxides, Mn ₂ O ₃ and CuO, in a total amount of 0.5, 1, 2 ,
5, 10, 20, and 30 parts by weight were added. M
The mixing ratio of n ₂ O ₃ and CuO is CuO / (Mn ₂ O ₃ + Cu
O) = 50 wt% was set. Then add 50 to this mixture.
g of water was added, and the mixture was rotated and mixed in a 1 L alumina pot containing zirconia balls having a diameter of 10 mm. Next, the mixture was taken out into a porcelain crucible and heated in an electric furnace at a heating rate (for example, 50 ° C./h) at which water did not boil.
Heat treated for h hours. As a result, seven types of Mn-C which are denitrated and have Mn ₂ O ₃ and CuO supported on the surface of γ-alumina
A u-based oxide deodorizing catalyst was obtained.

(Embodiment 2) Manganese nitrate hexahydrate and copper nitrate trihydrate are converted to their respective oxides, Mn ₂ O ₃ and CuO, in a total amount of 1 g per 30 g of γ-alumina.
0 parts by weight were added. The mixing ratio of Mn ₂ O ₃ and CuO is CuO / (Mn ₂ O ₃ + CuO) = 5, 10, 2
5, 75, 90, and 100 wt% were set. The rest is post-treated by the method described in the first embodiment, and the six types of Mn-Cu
A system oxide deodorizing catalyst was obtained.

(Embodiment 3) Next, Mn-Cu-Zr
The deodorizing catalyst comprising a system oxide will be described.

Manganese nitrate hexahydrate and copper nitrate trihydrate were added to 30 g of γ-alumina in a total amount of 10 parts by weight in terms of the respective oxides, Mn ₂ O ₃ and CuO. Was added. The mixing ratio of Mn ₂ O ₃ and CuO is CuO /
(Mn ₂ O ₃ + CuO) = 50 wt% was set. To this catalytically active component, 1, 5, 30, 50, 100, 200, and 250 parts by weight of zirconium nitrate in terms of ZrO ₂ was added. Next, 500 g of water was added to this mixture, and the mixture was rotationally mixed in a 1 L alumina pot containing zirconia balls of φ10 mm. Next, the mixture was taken out into a magnetic crucible, heated in an electric furnace at a heating rate (for example, 50 ° C./h) at which water did not bump, and heat-treated at 500 ° C. for 1 hour. As a result, denitration is performed, and M
carrying n ₂ O ₃ and CuO and ZrO ₂ 7 kinds of Mn-C
A u-Zr-based oxide deodorizing catalyst was obtained.

(Embodiment 4) FIG. 1 is a perspective view of a deodorizing catalyst filter according to Embodiment 4 of the present invention, and FIG. 2 is an enlarged view of a main part of a portion A in FIG.

1 and 2, reference numeral 1 denotes a honeycomb structure obtained by a corrugating method, 2 denotes inorganic fibers,
3 is ceramics, 4 is a catalyst powder.

Next, a method for producing the deodorizing catalyst filter having the above structure will be described below. 1000 g of 50% alumina-50% silica fiber and 1000 g of sericite clay are put into 600 liters of water and mixed and dispersed. 100-200 g of pulp is put into this, and an organic bond such as vinyl acetate is added to fibers, pulp,
1 to 5 parts by weight based on the total solid content of the clay is added and mixed. Next, as an inorganic coagulant, aluminum chloride was added in an amount of 3 to 7 parts by weight based on the solid content, and a polymer coagulant such as polyacrylamide was added in an amount of 0.5 to 5 parts by weight based on the solid content. Agglomerated. This is made into a paper using a fourdrinier machine, and the width is 350 mm, the thickness is 0.5 mm, and the length is 25 m.
Was produced. This sheet was formed by a corrugating method to form a honeycomb formed body.
This molded body was heat-treated at 1250 ° C to 1350 ° C to obtain a honeycomb structure having a width of 50 mm x a length of 50 mm x a depth of 40 mm.

The porosity of this honeycomb structure was about 80%. Next, the catalyst component / γ obtained in the first embodiment was obtained.
-Alumina) = 10 parts by weight, CuO / Mn ₂ O ₃ + CuO
= 50 wt% of a catalyst powder was dispersed in 100 g of water to prepare a catalyst slurry. The above-mentioned honeycomb structure was impregnated several times into the catalyst slurry to support the catalyst.
Thereafter, it was dried to obtain a deodorizing catalyst filter shown in FIGS. At this time, the supported amount of the catalyst was 0.04 g / cc.

(Embodiment 5) FIG. 3 is a perspective view of a deodorizing catalyst filter according to Embodiment 5 of the present invention, and FIG. 4 is an enlarged view of a main part of a portion B in FIG. 3 and 4, reference numeral 10 denotes a PTC honeycomb structure made of PTC ceramics, 11 denotes a cell wall of the PTC honeycomb structure 10, 12 denotes a cell through hole of the PTC honeycomb structure 10, 1
Reference numeral 3 denotes an insulating layer made of alumina, silica, or the like, which is wash-coated on the surface of the PTC honeycomb structure 10.

The method for producing the catalyst filter for deodorization of the present embodiment configured as described above will be described below. First, Tc = barium titanate as a main raw material
For 10kg of PTC ceramic powder of 120 ° C material,
20 to 30 parts by weight of a polymer-based pore-forming agent, 15 parts by weight of a methylcellulose-based thickener, 1 part by weight of an organic plasticizer,
25 to 30 parts by weight of water was added and dry mixed. Next, the compound mixed with the kneader was kneaded with a three-stage roller. Next, a honeycomb-shaped formed body was obtained using a vacuum extruder. The molded body is fired at 1300 ° C. for 1 hour, and is 50 mm wide × 5 mm long.
A honeycomb catalyst carrier having a size of 0 mm × a depth of 40 mm was obtained. The porosity of this honeycomb carrier was about 45%.

Next, the obtained PTC ceramic structure 1
Nine through-holes 20 were covered with resin to form a mask. This PTC ceramic structure 1 was subjected to a wash coat of alumina. Next, (catalyst component / γ-alumina) obtained in Example 3 = 10 parts by weight, CuO
/ (Mn ₂ O ₃ + CuO) = 50 wt%, ZrO ₂ 10%
10 g of the added catalyst powder was dispersed in 100 g of water to prepare a catalyst slurry. The above-mentioned honeycomb structure was impregnated several times into the catalyst slurry to support the catalyst. Thereafter, it was dried to obtain a deodorizing catalyst filter. At this time, the supported amount of the catalyst was 0.04 g / cc. Next, the resin mask was removed, an Ag paste was applied to both end faces of the honeycomb having openings, and silver was baked at 500 ° C. to obtain a deodorizing catalyst filter shown in FIG. When a direct current was passed through this filter, the temperature rose to about 150 ° C. within 10 seconds.

(Embodiment 6) FIG. 5 is a schematic sectional view of a deodorizer using a deodorizing catalyst filter produced in Embodiment 5 of the present invention. Reference numeral 20 denotes a deodorizer according to the present embodiment, 21 denotes a cylindrical container made of metal, synthetic resin, wood, or the like, 22 denotes a gas inlet provided in the container 21, and 23 denotes a gas inlet. A gas outlet port opened in the container body 21 in communication with 22, and a vertical width 24 m is disposed in the container body 21 at a distance of about 10 mm from the gas inlet port 22.
m, a width of 50 mm and a depth of 2 to 3 mm, a fibrous prefilter formed in a substantially rectangular parallelepiped shape, and 25 is disposed within the container body 21 at a distance of about 10 mm from the prefilter 24 according to the above-described embodiment of the present invention. The deodorizing filter in the fifth embodiment, 26 is approximately 3
A suction fan disposed at a distance of 0 mm, 27 is a control unit for controlling the deodorizing catalyst filter 25 and the fan 26, 28 is a malodorous component contained in the air, and 29 is a deodorizer 22 which is purified by the deodorizer 22 to remove gas. It is an odorless component contained in the purified gas discharged from the outlet 23b. Here, the deodorizing catalyst filter 25 is set at about 120 ° C. after inputting a switch (not shown) provided at a predetermined portion of the deodorizer 20. Although not shown, a fibrous heat insulating material formed in a substantially rectangular parallelepiped shape having a width of 50 mm, a width of 60 mm, and a depth of 20 mm is wound around the deodorizing filter 25. Further, the shape of the container body 21 is not limited to the above-described tubular shape, and may be formed in a box shape or the like. Although not shown, the peripheral wall of the container body 21 includes:
A door for replacing the pre-filter 24 may be provided.

The operation of the deodorizer of the present embodiment configured as described above will be described below. First, the switch section is turned on. Next, the control unit 27 detects that the switch unit is turned on, and applies a predetermined DC current to the deodorizing filter 25 and the fan 26. Next, when the fan 26 is driven, air outside the deodorizer 20 is sucked from the gas suction port 22. Next, large air and cotton dust are collected by the pre-filter 24 from the air sucked from the gas inlet 22. Next, the deodorizing filter 25 decomposes and removes the malodorous component 28 contained in the air. Next, the purified gas purified by the deodorizing catalyst filter 25 is supplied to the fan 26.
Is discharged from the gas discharge port 23 to the outside.

Next, a deodorizing performance test was performed using the deodorizer of the present embodiment. Hereinafter, the results will be described. First, a deodorizer of the present embodiment was prepared. Next, the deodorizer of the present embodiment is placed in a 500 mm × 500 mm × 500 mm plastic container, and the inside of the container is filled with air containing 60 ppm of hydrogen sulfide as a target gas.
The deodorizing effect was confirmed. As a result, it was confirmed that 99% or more of hydrogen sulfide was decomposed within one minute. Further, similar results were confirmed when the gas in the container was changed to methyl disulfide, methyl mercaptan, or the like.

Further, an experiment was carried out in the same manner as above except that the deodorizing catalyst filter was replaced with the one prepared in Embodiment 4, and it was confirmed that 95% or more of hydrogen sulfide was decomposed within one minute. .

[0053]

【Example】

(Example 1) The deodorizing efficiency of the deodorizing catalyst obtained in Embodiment 1 was evaluated.

FIG. 6 is a schematic sectional view of an apparatus for evaluating a deodorizing catalyst. Reference numeral 30 denotes an evaluation device for a deodorizing catalyst, 31 denotes an evaluation box having a capacity of 10 L, 32 denotes a petri dish installed in the evaluation box 31, 33 denotes a deodorizing catalyst powder, 34 denotes a gas supply port,
5 is a gas discharge port, 36 is a fan, and 37 is a detection tube insertion port.

Using the deodorizing catalyst evaluating apparatus shown in FIG.
2 to 10 g of the deodorizing catalyst powder 3 obtained in Embodiment 1.
I put one of the three. Next, after opening the gas supply port 34 and the gas discharge port 35, 15 ppm of CH _{3 was} supplied from the gas supply port.
The air containing SH was blown, and the gas in the evaluation box 31 was replaced with the gas. After several minutes, the gas supply was stopped, and the gas supply port 34 and the gas discharge port 35 were closed.
Next, the switch of the fan 36 in the evaluation box 31 is turned on, and the fan 6 is turned under the condition of the air flow rate 10 (l / min) to generate a gas flow in the experimental box 31 and the petri dish 3
Odor gas was brought into contact with the catalyst powder in 2. The gas concentration was measured using a detection tube inserted from the detection tube insertion port 37. The relationship between the elapsed time and the gas concentration at this time was measured. The results are shown in (Table 1).

[0056]

[Table 1]

As is evident from Table 1, the concentration of the catalyst component was only about 25% of the initial concentration (15 ppm) even after 480 sec. In comparison, 240 sec for 1 to 20 parts by weight
As a result, it was found that a concentration reduction of about 90% or more with respect to the initial concentration, that is, a deodorizing effect was obtained. 20 for 30 parts by weight
A deodorizing effect almost equivalent to that of parts by weight was obtained. This proved that the addition of 20 parts by weight of the catalytically active component was sufficient.

(Example 2) Next, the evaluation of the catalyst powder obtained in Embodiment 2 was performed using the apparatus shown in FIG.
Performed in the same manner as Incidentally, CuO / (Mn ₂ O ₃ + Cu
For O) = 50, the data of Example 1 was used. The results are shown in (Table 2).

[0059]

[Table 2]

As is clear from Table 2 above, at 10 to 90 wt%, 240 s was obtained due to the synergistic effect of both catalyst components.
At ec, it was found that a deodorizing effect of about 90% or more with respect to the initial concentration was obtained. At 5 wt% and 100 wt%, a good deodorizing effect could not be obtained.

Example 3 Evaluation of the catalyst powder obtained in Embodiment 3 was carried out in the same manner as in Example 1 using the apparatus shown in FIG. The data of ZrO ₂ wt% addition is shown in Example 1.
Was used.

The results are shown in Table 3.

[0063]

[Table 3]

As is apparent from Table 3 above, Mn ₂ O ₃
5 to 20 ZrO ₂ for the catalytically active component of CuO
The addition of 0 parts by weight improved the deodorizing properties. 1 and 2
The addition of 50 parts by weight did not show the behavior of improving the deodorizing characteristics.

Next, the gas supply port 34 and the gas discharge port 35 are opened, the switch of the experimental fan 36 is turned on, and an odorous gas (air dilution gas containing 15 ppm CH ₃ SH) continues to flow for 100 hours. A deterioration test (sulfur resistance evaluation test) was performed. As a result, the material to which ZrO ₂ was added in an amount of 5 parts by weight or more hardly deteriorated.

(Example 4) Next, the deodorizing ability of the deodorizing filter obtained in Embodiment 4 was confirmed using a flow-through experimental device.

FIG. 7 is a schematic diagram of a flow-type measuring device.
40 is a flow-type measuring device, 41 is a reaction tube, 42 is a deodorizing filter installed at the center of the reaction tube 41, 43 is an electric furnace, 44 is an inlet of the reaction tube, 45 is a gas before processing, and 46 is an outlet of the reaction tube. , 47 are processing gases.

The measuring method will be briefly described. First, the deodorizing filter 42 manufactured in the fourth embodiment is set in the reaction tube 41. Next, the reaction tube 41 is set in a catalyst ring type electric furnace 43. A pre-treatment gas 45 (CH ₃ SH gas diluted with air to 15 ppm) flows through an inlet 44 of the reaction tube 41, passes through a deodorizing catalyst filter 42, and flows out of an outlet 46 of the reaction tube. One hour after the start of the measurement, the concentration of the processing gas 47 at the outlet 46 of the reaction tube 41 was measured using a gas chromatograph. The measurement conditions were as follows: reaction temperature 25 ° C. to 150 ° C., space velocity SV (volume of gas per hour before treatment / volume of catalyst filter) = 2.
5000 and 50,000 were performed.

Table 4 shows the measurement results. The deodorizing efficiencies in the table were determined by the following equations. Deodorization efficiency (%) = [(Gas concentration before treatment−Gas concentration after treatment) / Gas concentration before treatment] × 100 As is clear from Table 4, even when the reaction temperature is 25 ° C., 95% or more. It was found that deodorizing efficiency was obtained.

Next, when an experiment was conducted at SV = 10000, it was found that the deodorizing efficiency was extremely high.

The space velocity SV varies depending on the target gas and the use conditions, but generally, the lower the catalyst, the more advantageous. However, the catalyst filter according to the present invention has a large specific surface area, so that by increasing the reaction temperature, the SV becomes 100%.
It turned out that it can be used even if it is 000 or more.

[0072]

[Table 4]

(Example 5) Next, with respect to the deodorizing filter obtained in the fifth embodiment, the deodorizing ability of the filter was measured in the same manner as in Example 4. The measurement conditions were: target gas: 15, 30, 45, 60 ppm H ₂ S / air dilution,
Reaction temperature 120 ° C, SV = 25000 (1 / H), 50
The temperature was controlled by applying a direct current to the deodorizing filter without applying a current to the electric furnace. The concentration was measured one hour after the start of the measurement in the same manner as in Example 4. The measurement results are shown in (Table 5).

As can be seen from Table 5, high deodorization efficiency of 97% or more was exhibited at any concentration.

[0075]

[Table 5]

[0076]

As described above, according to the present invention, a deodorizing catalyst having the following excellent effects, a deodorizing filter using the same, and a deodorizer using the same can be realized. That is,
According to the deodorizing catalyst of the first aspect, a strong deodorizing ability can be obtained at a low temperature of 100 ° C. or less, and the energy saving is excellent. In addition, a high deodorizing ability can be obtained immediately after the start of deodorizing. Furthermore, since the deodorization treatment temperature is low, SOx and NOx
No pollution and excellent pollution prevention.

According to the deodorizing catalyst of the second aspect, in addition to the effect obtained in the first aspect, the synergistic effect of the two catalytically active components can be obtained by using a predetermined range of oxides of Mn and Cu as the catalytically active components. It can be efficiently extracted and higher deodorization efficiency can be obtained. It can be produced at lower cost than conventional platinum-based catalysts, and can achieve high deodorizing ability.

According to the deodorizing catalyst of the third aspect, in addition to the effects obtained in the first or second aspect, by containing a predetermined amount of Zr oxide, it is possible to efficiently supply oxygen to the deodorizing reaction system. As a result, the deodorizing reaction rate can be increased, and the deodorizing efficiency can be significantly improved. Further, the sulfur resistance can be improved and the durability of the deodorizing catalyst can be significantly improved.

According to the deodorizing filter of the fourth aspect, since the above-mentioned excellent deodorizing catalyst is supported on the fibrous honeycomb structure having a large porosity and a large surface area, an extremely high deodorizing efficiency can be obtained at a low temperature. In addition, the deodorizing device can be made compact and the safety can be improved because of the low temperature.
Further, since the fibrous honeycomb structure can support a large amount of the catalyst uniformly, an extremely high deodorizing ability can be obtained. Further, it is excellent in sulfur resistance and the like, and can improve durability. Further, since the fibrous honeycomb structure has a high porosity, the weight of the deodorizer can be reduced.

According to the deodorizing filter of claim 5, PT
Since an insulating layer is provided on the C honeycomb structure to carry the above-described high-performance deodorizing catalyst, the entire structure can be extremely compact, and an extremely high deodorizing ability can be obtained at a constant temperature in a very short time.

According to the deodorizer of the sixth aspect, since the deodorizing filter having the above-mentioned excellent effects is built in, it is possible to obtain a compact, excellent energy saving and extremely high deodorizing ability.

[Brief description of the drawings]

FIG. 1 is a perspective view of a deodorizing catalyst filter according to Embodiment 4 of the present invention.

FIG. 2 is an enlarged view of a main part of part A in FIG.

FIG. 3 is a perspective view of a deodorizing catalyst filter according to Embodiment 5 of the present invention.

FIG. 4 is an enlarged view of a main part of a part B in FIG. 3;

FIG. 5 is a schematic cross-sectional view of a deodorizer using a deodorizing catalyst filter manufactured in Embodiment 5 of the present invention.

FIG. 6 is a schematic cross-sectional view of a device for evaluating a deodorizing catalyst.

FIG. 7 is a schematic diagram of a flow-type measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Honeycomb structure 2 Inorganic fiber 3 Ceramics 4 Catalyst powder layer 10 PTC honeycomb structure 11 Cell wall part 12 Cell through hole 13 Insulating layer 20 Deodorizer 21 Container body 22 Gas inlet 23 Gas outlet 24 Prefilter 25 Deodorizing filter 26 Fan 27 Control unit 28 Odor component 29 Odorless component 30 Evaluation device 31 Box 32 Petri dish 33 Deodorizing catalyst powder 34 Gas supply port 35 Gas outlet 36 Experimental fan 37 Detector tube insertion port 40 Flow-type measuring device 41 Reaction tube 42 Deodorizing catalyst Filter 43 Electric furnace 47 Inlet of reaction tube 45 Gas before processing 46 Outlet of reaction tube 47 Processing gas

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Yukinori Ikeda 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. A mixture of oxides of Mn and Cu as catalytically active components in 100 parts by weight of a carrier powder containing at least one of aluminum silicate salts including γ-alumina, silica, zeolite, silica, titania and the like. A deodorizing catalyst comprising 20 parts by weight. 2. The catalyst according to claim 1, wherein said catalytically active component comprises Mn ₂ O ₃ of 10 to 70 wt%, and Cu of CuO 3%.
The deodorizing catalyst according to claim 1, comprising 0 to 90 wt%. 3. The method according to claim 1, wherein the amount of Zr is ZrO.
The deodorizing catalyst according to claim 1 or 2, wherein 5 to 200 parts by weight in terms of ₂ is added. 4. A deodorizing filter comprising the fibrous honeycomb structure containing inorganic fibers as a main component and the deodorizing catalyst according to claim 1 supported thereon. 5. A PTC using PTC ceramics as a main raw material.
An insulating layer made of at least one of alumina and silica formed on the surface of the honeycomb structure, and the deodorizing catalyst according to any one of claims 1 to 3 supported on the surface of the insulating layer. A deodorizing filter comprising: 6. A container having a gas inlet and a gas outlet, a fibrous prefilter disposed downstream of the gas inlet in the container, and disposed downstream of the prefilter. A deodorizer comprising: the deodorizing filter according to claim 4 or 5; and a fan disposed downstream of the deodorizing filter.