JP2002336653A - Plasma catalytic reactor, air cleaning apparatus, nitrogen oxide cleaning apparatus, waste combustion gas cleaning apparatus, dioxine decomposing apparatus and fluorocarbon gas decomposing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reaction acitivity in the presence of a catalyst in a plasma catalytic reactor (20) in which a chemical reaction is accelerated by combining a low temperature plasma with the catalyst. SOLUTION: An active species generated from the low temperature plasma is utilized for the chemical reaction on the catalyst by using as a catalytic material a mixture or a multiple oxide of manganese oxide with at least one kind of oxide of iron, cerium, europium, lanthanum and copper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma catalyst reactor for promoting a chemical reaction of a fluid to be treated by combining a low-temperature plasma generated by electric discharge with a catalyst, and an air purification apparatus using the plasma catalyst reactor. The present invention relates to a nitrogen oxide purifying device, a combustion exhaust gas purifying device, a dioxin decomposing device, and a CFC decomposing device, and particularly relates to a composition of a catalyst used in a plasma catalytic reactor.

[0002]

2. Description of the Related Art Conventionally, various kinds of catalysts have been used to promote a chemical reaction in the treatment of a fluid to be treated such as air purification. As a treatment using a catalyst, first, there is a thermocatalytic method in which the catalyst is activated by heating. In this method, a noble metal-based catalyst such as platinum is generally used to promote the oxidation reaction of the component to be treated in the air. This method has a higher ability to promote a chemical reaction than the following methods using a photocatalyst or ozone gas. However, in general, the catalyst is used by heating it to a high temperature of 300 ° C. or more (however, the temperature of the reaction Because the running cost is relatively high.

Next, a photocatalytic method for promoting a chemical reaction using a photocatalyst is also known. Since this method is a reaction at room temperature, it can be easily installed in an air purification device or the like. However, since the life of the ultraviolet lamp required to sufficiently activate the photocatalyst is short, the ultraviolet lamp is periodically used (for example, every few months). ), The operation cannot be continued for a long period of time, and a great deal of labor and cost are required for the replacement. Furthermore, the photocatalytic method generally has a disadvantage that the ability to advance a chemical reaction is inferior to the thermal catalytic method.

[0004] As a method of accelerating a chemical reaction,
In addition to the above, an ozone method using ozone gas is also known. This method is also a reaction at room temperature, but in addition to a device for generating ozone gas, a device for decomposing residual ozone gas into oxygen due to the harmfulness of ozone gas is also required. Therefore, in the case of the ozone method, the configuration of the apparatus tends to be complicated, and sufficient safety measures are required. In addition, this ozone method also has a disadvantage that the ability to promote a chemical reaction is inferior to the thermal catalyst method.

[0005] On the other hand, as another method for promoting a chemical reaction, there is a plasma catalytic method in which a treatment is performed by combining plasma generated by electric discharge with a catalyst. In this method, conventionally, a catalyst is activated using heat, light, ozone, or the like when plasma is generated by electric discharge, thereby promoting a chemical reaction. In particular, when low-temperature plasma is used, high-speed electrons and low-speed ions are generated, and the energy of the high-speed electrons is 10 eV or more (100,000 ° C. or more in terms of temperature). Since the thermodynamic temperature of the space hardly increases, the running cost can be reduced as compared with the thermocatalytic method. In addition, this method has a high ability to promote a chemical reaction because the activity of the catalyst can be greatly increased as compared with the photocatalytic method and the ozone method.

As this plasma catalytic method, for example, Japanese Patent Application Laid-Open No. Hei 8-266854 describes a technique for purifying air by deodorizing or detoxifying odorous or harmful components. According to the technology described in this publication, a manganese-based catalyst having a property of decomposing ozone into oxygen and active oxygen, a platinum catalyst activated by heat, a titanium oxide catalyst activated by light, and the like are used to generate plasma by discharge. Ozone, heat and light generated at the time are used.

[0007]

However, in the plasma catalysis method disclosed in the above publication, ozone,
Only heat and light are used, and various active species generated together with ozone, heat, and light when generating plasma by electric discharge (eg, hydroxy radical, excited oxygen molecule, excited nitrogen molecule, excited water molecule, etc.) Is not used. It is thought that if these active species are used effectively, the reaction of the fluid to be treated can be promoted. However, since the above-mentioned conventional plasma catalyst method does not use any of these active species, the reactivity of the fluid to be treated is reduced. It has not been raised enough.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a plasma catalytic reactor which promotes a chemical reaction by combining a low-temperature plasma and a catalyst. To increase the throughput of the reactor.

[0009]

Means for Solving the Problems The present invention specifies the components of a catalyst used in a plasma catalytic reactor (20) and effectively utilizes various active species generated by plasma for the treatment of a fluid to be treated. In this case, the reaction at the time of gas treatment or the like can be promoted.

Specifically, the first solution taken by the present invention is a discharge means (21, 22) for generating low-temperature plasma by discharge in a flow space of a fluid to be treated, and the discharge means (21, 22) And a catalyst means (23) arranged in the discharge field (D) or downstream of the discharge field (D). And this plasma catalytic reactor (20)
The catalyst means (23) is characterized in that manganese oxide (hereinafter, referred to as Mn oxide) and at least one oxide of iron, cerium, europium, lanthanum, and copper (hereinafter, specified as (Hereinafter referred to as oxide) or a composite oxide.

In the first solution, the discharging means (2
When the fluid to be processed passes through the discharge field (D) formed by (1,22), low-temperature plasma is generated. Various active species are generated by the low-temperature plasma, and these active species include, in addition to ozone, radicals such as hydroxy radicals,
Excited oxygen molecules, excited nitrogen molecules, excited water molecules and the like are included. Then, these various active species efficiently react with harmful components and odor components in a highly active state by the action of a catalyst to decompose and remove these substances.

More specifically, Mn contained in the catalyst
The oxide decomposes ozone generated by discharge into oxygen and active oxygen. This active oxygen oxidizes harmful components and odor components of the fluid to be treated and decomposes them into harmless components and odorless components. In addition, active oxygen obtained by decomposition of ozone, radicals such as hydroxy radicals contained in low-temperature plasma gas, and various activities such as excited oxygen molecules (active oxygen), excited nitrogen molecules, and excited water molecules. The species is adsorbed on the surface of the specific oxide contained in the catalyst means (23) or on the interface between the Mn oxide and the specific oxide in a radical or excited state.
For this reason, many active species having high activity are present as active groups on the surface of the catalyst, and harmful components and odor components in the fluid to be treated are decomposed faster than in the case where a conventional catalyst is used.

[0013] The second solution taken by the present invention is:
In the plasma catalytic reactor (20) according to the first solution, the catalyst (23) has a composition ratio of manganese oxide in the catalyst substance of 20% to 50%. . In this case, the specific oxide is M
Since it occupies the rest of the n oxide, its composition ratio is 80% to 5%.
0%.

In the second solution, the composition ratio of the Mn oxide in the catalyst material is set to 20% to 50%, so that the Mn oxide and the specific oxide are dispersed and miniaturized. The specific surface area of the catalyst increases. As a result, the interface between the Mn oxide and the specific oxide increases, so that the catalyst adsorbs more active species and the activity is further improved.

[0015] A third solution taken by the present invention is:
In the plasma catalytic reactor (20) according to the first or second solution, the catalyst means (23) is used as a catalyst substance, for example, a plurality of manganese oxides having different oxidation numbers such as MnO ₂ and Mn ₂ O _3. It is characterized by containing things.

In the third solution, since the catalyst contains Mn oxides having different oxidation numbers, Mn oxide is used.
Compared to the case where only one type of oxide is used, more active species can be adsorbed and used for the reaction in the treatment reaction of the fluid to be treated.

A fourth solution taken by the present invention is:
In the plasma catalytic reactor (20) according to the first, second or third solution, the discharging means (21, 22) comprises a streamer discharge, a pulse corona discharge, a corona discharge, a creeping discharge, a silent discharge, a partial discharge. Alternatively, a low-temperature plasma is generated by glow discharge. Various high-voltage power supplies such as direct current, alternating current, and pulse can be used as a power supply for causing these discharges according to a discharge method.

In the fourth solution, the discharging means
At (21,22), various discharges generate low-temperature plasma, and various active species contained in the gas are used to promote a chemical reaction of the fluid to be treated in the presence of the catalyst.

The fifth solution taken by the present invention is:
In the plasma catalytic reactor (20) according to the first, second, third or fourth solution means, in the discharge field (D) of the discharge means (21, 22) or downstream of the discharge field (D). The adsorption means (23) for adsorbing the components to be treated contained in the fluid to be treated is a catalyst means.
It is characterized by being arranged together with (23).

In the fifth solution, since the component to be treated contained in the fluid to be treated is adsorbed by the adsorption means (23), the active species contained in the low-temperature plasma-like gas are reduced in the presence of the catalyst. In addition to the components to be treated contained in the fluid to be treated and suspended, they act on the components to be treated adsorbed by the adsorption means (23) to decompose and remove these components. That is,
The various active species generated in the discharge field (D) act not only on the components to be processed floating in the fluid to be processed, but also on the components to be processed adsorbed by the adsorption means (23).

A sixth solution taken by the present invention is:
The present invention relates to an air purifier (deodorizer or air purifier) (1) using a plasma catalytic reactor (20) according to the first, second, third, fourth or fifth solution means. The air purifying apparatus (1) includes a casing (10) in which the plasma catalytic reactor (20) is housed, and introduces air to be treated into the casing (10) to discharge means (21, 22). ) Through the discharge field (D) and the catalyst means (23) to treat odorous or harmful components in the air to be treated.

In the sixth solution, the odor component or the harmful component in the air to be treated is converted into the low-temperature plasma and the catalyst means (23).
Thus, the air to be treated is purified by performing a process such as oxidative decomposition.

A seventh solution taken by the present invention is:
Nitrogen oxide purifying apparatus using a plasma catalytic reactor (20) according to the first, second, third, fourth or fifth solving means.
It is related to (2). This nitrogen oxide purifier (2)
Is provided with a casing (10) in which the plasma catalytic reactor (20) is housed, and a gas to be treated is introduced into the casing (10) to discharge a discharge field (D) of discharge means (21, 22). And catalyst means
By passing through (23), nitrogen oxides in the gas to be treated are treated.

In the seventh solution, the gas to be treated is purified by subjecting nitrogen oxides in the non-treatment gas to a process such as reductive decomposition using low-temperature plasma and the catalyst means (23).

The eighth solution taken by the present invention is:
A flue gas purifying apparatus using a plasma catalytic reactor (20) according to the first, second, third, fourth or fifth solving means.
It is related to (3). This flue gas purifier (3)
Has a casing (10) in which the plasma catalytic reactor (20) is housed, and discharges the combustion exhaust gas into the casing (10) to discharge fields (D) and (D) of discharge means (21, 22). Catalytic means
By passing through (23), nitrogen oxides in the combustion exhaust gas are treated, and unburned fuel and hydrocarbons are treated.

In the eighth solution, low-temperature plasma and catalyst means (23) are used in combination to treat nitrogen oxides in the combustion exhaust gas by reductive decomposition and the like, and to convert unburned fuel and hydrocarbons by oxidative decomposition and the like. The treatment purifies the combustion exhaust gas.

Further, a ninth solution taken by the present invention is as follows.
The present invention relates to a dioxin decomposer (4) using a plasma catalytic reactor (20) according to the first, second, third, fourth or fifth solution means. This dioxin decomposer
(4) is provided with a casing (10) in which the plasma catalytic reactor (20) is housed, and a combustion exhaust gas is introduced into the casing (10) to discharge electric field (21, 22) of discharge means (21, 22). D) and the catalyst means (23) so as to treat dioxin in the combustion exhaust gas.

In the ninth solution, the combustion exhaust gas is purified by subjecting dioxin in the combustion exhaust gas to a treatment such as oxidative decomposition using low-temperature plasma and the catalyst means (23).

Further, a tenth solution taken by the present invention is a device for decomposing freon gas using a plasma catalytic reactor (20) according to the first, second, third, fourth or fifth solution. (5). This freon gas decomposer
(5) is provided with a casing (10) in which the plasma catalytic reactor (20) is housed, and a discharge field (D) of discharge means (21, 22) by introducing Freon gas into the casing (10). ) And the catalyst means (23) to decompose the chlorofluorocarbon gas.

In the tenth solution, the use of low-temperature plasma and the catalyst means (23) allows the CFC gas to be reliably decomposed.

[0031]

According to the first aspect of the present invention, since the catalytic substance is specified, various active species generated by the low-temperature plasma can be effectively used when processing the fluid to be processed such as air purification. In this case, the chemical reaction at that time can be drastically promoted. Therefore, the processing capacity of the plasma catalytic reactor (20) can be increased. Further, since the processing capacity can be increased in this way, it is possible to reduce the size of the reactor (20).

According to the second solution, by setting the composition ratio of the Mn oxide in the catalyst material to 20% to 50% to increase the specific surface area of the catalyst, the catalyst can have more active species. Is absorbed, so that a chemical reaction in treating the fluid to be treated can be further promoted. Therefore, it is possible to further increase the processing capacity of the plasma catalytic reactor (20).

According to the third solution, the catalyst contains Mn oxides having different oxidation numbers, so that more kinds of active species can be used in the treatment of the fluid to be treated. Therefore, the reaction can be further promoted. Therefore, the processing capacity of the plasma catalytic reactor (20) can be further increased.

According to the fourth solution, the discharge means (21, 22) for generating a streamer discharge, a pulse corona discharge, a corona discharge, a creeping discharge, a silent discharge, a partial discharge, or a glow discharge is used. Since the plasma is generated and various active species contained in the gas are used to promote the chemical reaction of the fluid to be processed, various types of discharge type plasma catalytic reactors (20) can be put to practical use.

According to the fifth aspect, the adsorption means (23) for adsorbing the component to be treated of the fluid to be treated is provided with the catalyst means.
(23) together with (23) in the discharge field (D) or downstream of the discharge field (D) to adsorb the components to be treated contained in the fluid to be treated.
(23), the active species contained in the low-temperature plasma-like gas are not only absorbed by the adsorption means (23), but also by the active species contained in the low-temperature plasma gas. The components are also reliably decomposed. Therefore, the processing performance of the plasma catalytic reactor (23) can be further improved. In addition, if the components to be treated can be captured and decomposed by the adsorption means (23) in this manner, even if the discharge time is shortened, the processing performance can be prevented from lowering, so that energy saving can be improved. It is possible.

Further, according to the sixth to tenth solutions, the catalyst composition is changed to Mn in various devices for treating the fluid to be treated by using the low-temperature plasma and the catalyst means (23) together.
By specifying oxides and specific oxides, active species generated by discharge can be used effectively, so that air purification equipment (1), nitrogen oxide purification equipment (2), and combustion exhaust gas purification equipment (3), respectively , A dioxin decomposer (4), and a chlorofluorocarbon gas decomposer (5).

[0037]

Embodiment 1 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

This embodiment relates to an air purification device (1) for purifying air by treating odorous or harmful components in the air to be treated by oxidative decomposition. FIG. 1 shows a schematic configuration of the air purification device (1).

As shown in the figure, the air purifying apparatus (1) has a configuration in which various functional parts are housed in a casing (10). As the functional parts, a dust collecting filter (11) and a centrifugal fan (1) are provided.
2) and the plasma catalytic reactor (20) are housed in a casing (10). In FIG. 1, reference numeral (13) denotes an ozone decomposition catalyst for decomposing ozone generated by discharge in the plasma reactor (20).

An air inlet (15) for sucking air into the casing (10) is formed on one side (the right side in the figure) of the casing (10), and a purified air is blown on the upper surface. Air outlet (16) is formed. Air inlet
(15) is provided with a suction grill (15a) and an air outlet (16)
Is provided with an outlet grill (16a). The dust suction filter (11) is arranged in the air suction port (15) inside the suction grille (15a) so as to collect dust contained in the suction air.

The air outlet (16) is formed on the upper surface of the casing (10) at the edge opposite to the air inlet (15) (the left edge in FIG. 1). And this air outlet
Corresponding to (16), the centrifugal fan (12) is
Is provided within. The centrifugal fan (12) is connected to a fan power supply (12a). In the above configuration,
The inside of the casing (10) has an air inlet (15) and an air outlet
The space between (16) is the circulation space of the air to be treated. When the centrifugal fan (12) is started, air to be processed is sucked into the casing (10) through the suction grill (15a) of the air suction port (15) and the dust filter (11). The air to be treated is
After treatment in the reactor (20) detailed below, the air outlet (1
It is blown out of the casing (10) from the blowout grill (16a) of 6).

FIG. 2 is a sectional view showing a schematic configuration of the plasma reactor (20), and FIG. 3 is a perspective view. This plasma reactor (2
0) is a discharge electrode (21) and a counter electrode (22) as discharge means for generating low-temperature plasma, and these electrodes (21,
22) A processing member disposed in close proximity to the counter electrode (22)
(23). That is, the processing member (23)
(D).

This processing member (23) is composed of a honeycomb-shaped substrate (23a) having a number of small holes (23b) penetrating along the direction of air flow, and has a surface on which a catalytic substance is supported. I have. Specifically, the processing member (23) has, as a catalyst material, manganese oxide, iron, cerium, europium,
It contains a mixture or a composite oxide with lanthanum and at least one oxide of copper (hereinafter, referred to as a specific oxide). The processing member (23) is set so that the composition ratio of the Mn oxide in the catalyst substance is 20% to 50%, and the composition ratio of the specific oxide is 80% to 50%. In addition, catalyst materials include MnO ₂ , Mn ₂ O _{3 and the} like.
Contains multiple types of manganese oxides with different oxidation numbers.

The catalyst of this embodiment is made of manganese, iron or cerium, and is prepared as follows. That is, first, an aqueous solution of manganese nitrate hexahydrate was prepared as a manganese compound, cerium nitrate hexahydrate as a cerium compound was added thereto, and iron nitrate nonahydrate was further added as an iron compound to obtain a liquid A. . On the other hand, a liquid B in which an alkali compound was dissolved in water was prepared as a precipitating reagent. Then, a coprecipitate was generated by pouring the solution A while stirring the solution B. Thereafter, aging is performed for 1 hour, and the above-mentioned coprecipitate is washed and dried.
By calcining at a temperature of 00 ° C. for 5 hours, a catalyst composed of manganese, iron, and cerium was obtained, and this was used for the honeycomb-shaped treatment member (23).

The treatment member (23) has an adsorbent carried on the surface of the base material (23a) together with the catalyst substance. The adsorbent adsorbs components to be treated such as odorous substances and harmful substances contained in the air to be treated, and for example, activated carbon or zeolite is used. As the adsorbent, porous ceramics, activated carbon fiber, mordenite, ferrierite, silicalite, or the like may be used, and at least one of them may be used.

As described above, since the processing member (23) has the catalytic substance and the adsorbent, in the present embodiment, the processing member (23) performs the processing for purifying the air to be processed. In addition to being a catalyst means for accelerating, it is also an adsorption means for adsorbing components to be treated contained in the air to be treated.

The discharge electrode (21) is composed of an electrode plate (21b) and a plurality of needle electrodes (21a) fixed substantially perpendicular to the electrode plate (21b). The electrode plate (21b)
It is made of a mesh material, punched metal, or the like, and has a number of openings (21c) through which air passes in a direction perpendicular to the plane. Also, an electrode plate having a large number of openings (22a) through which air passes in a direction perpendicular to the plane, such as a mesh material or a punched metal, is used for the counter electrode (22). And
The discharge electrode (21) is arranged such that the electrode plate (21b) is substantially parallel to the counter electrode (22), and the needle electrode (21a) is substantially perpendicular to the counter electrode (22).

A DC high voltage power supply (power supply means) (24) is connected to both electrodes (21, 22) so that a streamer discharge is generated between the discharge electrode (21) and the counter electrode (22). ing.
This streamer discharge generates a low-temperature plasma-like gas in the discharge field (D). This gas contains, as active species,
Includes fast electrons, ions, radicals such as ozone and hydroxyl radicals, and other excited molecules (excited oxygen molecules, excited nitrogen molecules, excited water molecules, and the like).

In the streamer discharge, a minute arc continues from the tip of the discharge electrode (21) to the counter electrode (22).
The small arc is formed as a plasma column with light emission, and develops continuously between the discharge electrode (21) and the counter electrode (21) where the distance between the equipotential surfaces is small. In this embodiment, the tip of the needle electrode (21a) is set at 60 ° (or 30 ° to 9 °).
(0 °), and has a slightly rounded spherical shape with a radius R of 0.5 mm at the forefront (see FIG. 13). And, since the tip angle (θ) of the discharge electrode (21) is specified to the above-mentioned angle, the minute arc spreads easily over a wide range and easily spreads, and a streamer discharge occurs over a wide range. That is, the streamer discharge in this case is generated in a region that spreads in a flared manner from the discharge electrode (21) toward the counter electrode (22). For this reason, in the streamer discharge using a DC high voltage, the discharge region for each needle electrode (21a) is widened, so that the plasma generation region can be expanded even if the number of needle electrodes (21a) is relatively small.

-Operating operation- Next, the operating operation of the air purification device (1) will be described.

When the operation of the air purification device (1) is started and the centrifugal fan (12) is started, first, air to be treated is sucked from the air suction port (15), and dust contained in the air is collected. The dust is collected by the dust filter (11). During operation of the device (1), streamer discharge occurred between the discharge electrode (21) and the counter electrode (22) of the plasma catalytic reactor (20), and dust was removed by the dust collection filter (11). The air passes through a discharge field (D) between the electrodes (21, 22).

When the air to be treated passes through the discharge field (D), it is activated by the action of the streamer discharge, and the processing member is activated.
On the catalyst of (23), the harmful substances and odor substances similarly activated and the active species efficiently react to decompose and remove these substances. Therefore, harmful substances and odorous substances in the air are quickly decomposed by a synergistic effect of the plasma and the catalyst.

Specifically, the Mn oxide contained in the catalyst decomposes ozone generated by discharge into oxygen and active oxygen. This active oxygen oxidizes harmful components and odor components of the fluid to be treated and decomposes them into harmless components and odorless components. Also,
Including active oxygen obtained by the decomposition of ozone, radicals such as hydroxyl radicals, and various active species such as excited oxygen molecules (active oxygen), excited nitrogen molecules, and excited water molecules,
The surface of the specific oxide contained in the catalyst means (23), M
The active species is adsorbed on the interface between the n-oxide and the specific oxide. As a result, many active species with high activity are present as active groups on the surface of the catalyst, and harmful components and odor components in the air to be treated are decomposed faster than when a conventional catalyst is used. become.

Furthermore, since the treatment member (23) also contains an adsorbent, harmful substances and odorous substances in the air to be treated are adsorbed by the adsorbent, and active species generated by low-temperature plasma are included in these components. Acts reliably to accelerate the decomposition process. In other words, by including the catalyst and the adsorbent in one processing member (23), more stable processing is performed.

-Effects of Embodiment 1- According to Embodiment 1, the manganese oxide and at least one of the above-mentioned specific oxides of iron, cerium, europium, lanthanum and copper are used. By using a catalyst containing a mixture or a composite oxide,
Various active species generated by the low-temperature plasma are effectively used for processing when purifying air, and can greatly promote a chemical reaction when processing air to be processed. Also,
Since the streamer discharge is caused to occur in a wide range to generate a large amount of active species in a wide range, the treatment can be promoted. Therefore, since the processing capacity of the plasma catalytic reactor (20) can be increased, the capacity of the air purification device (1) can also be increased.

By setting the composition ratio of Mn oxide in the catalyst material to 20% to 50%, the Mn oxide and other specific oxides are dispersed and refined, and the specific surface area of the catalyst increases. Therefore, the interface between the Mn oxide and the specific oxide increases, and the catalyst adsorbs more active species. Further, Mn
By preparing a catalyst containing an oxide and a specific oxide by a coprecipitation method, the Mn oxide and the specific oxide have an effect of refining and increasing the specific surface area of the catalyst. Increases the number of active species to be adsorbed, and the activity is further improved.

By preparing the catalyst by the coprecipitation method, in addition to MnO ₂ , manganese oxides having different oxidation numbers, such as Mn ₂ O _3, are included in the catalyst. Active species can be used,
Activity is further improved. Further, by preparing the catalyst by the coprecipitation method, a large amount of the composite oxide of the Mn oxide and the specific oxide is generated particularly at the interface between the Mn oxide and the specific oxide, so that the Mn oxide (MnO ₂ , A composite oxide (MnCeFe ₂ O ₄ ) having an oxidation number different from that of Mn ₂ O ₃ ) or the specific oxide (Fe ₂ O ₃ , CeO ₂ ) can be obtained, and more radicals can be used.

When cerium is used as a substance other than manganese, its oxide CeO2 has an oxygen storage capacity, so that the amount of oxygen available for reaction on the catalyst increases. For this reason, the activity during the reaction can be increased as compared with the case where Ce is not used. Further, even when europium, lanthanum, copper, or the like is added, more kinds of active species can be used, so that the activity is further increased and the reaction can be promoted.

[0059]

Second Embodiment The first embodiment is directed to a plasma catalytic reactor (20) in which a low-temperature plasma generated by a streamer discharge is combined with a catalyst containing a manganese oxide and a specific oxide such as iron or cerium. The air purification device (1) that purifies the air by processing odorous or harmful components in the air to be treated by oxidative decomposition using
The plasma catalytic reactor (20) of the present invention can also be applied to a nitrogen oxide purifying apparatus (2) for treating nitrogen oxides in a gas to be treated by reductive decomposition or the like. In this case, a catalyst suitable for treating nitrogen oxides is selected from the catalyst materials described in the first embodiment.

FIG. 4 schematically shows a cross-sectional structure of the nitrogen oxide purifying apparatus (2). This nitrogen oxide purifier
(2) has a gas inlet (corresponding to the air inlet of Embodiment 1) (15) and a gas outlet (corresponding to the air outlet) (16) on the pair of side walls of the casing (10). In the casing (10), a dust collection filter (1
1) is located. In addition, plasma catalytic reactor (20)
As described above, between the discharge electrode (21) and the counter electrode (22),
The honeycomb-shaped processing member (23) supporting a catalyst containing a manganese oxide and a specific oxide is arranged.

In this device (2), no fan is provided in the casing (10). And in this device (2)
By arranging the casing (10) with the direction of the gas inlet (15) and the gas outlet (16) in the flow path of the gas to be treated containing nitrogen oxides as the component to be treated, the gas to be treated is It passes through the discharge field (D).

In this nitrogen oxide purifying apparatus (2), the gas to be treated containing nitrogen oxide is introduced into the casing (10) from the gas inlet (15), and the discharge field by the streamer discharge is discharged.
Go through (D). Therefore, the gas to be processed is activated by the plasma, and when the active species contained in the gas passes through the processing member (23), the nitrogen oxides are reduced to nitrogen gas on the catalyst.

Also in the second embodiment, since the catalytic substance is specified, various active species generated by the low-temperature plasma are effectively used in the process of purifying the air, and the chemical species in the process of processing the gas to be processed is also effective. The reaction can be drastically promoted. Therefore, since the processing capacity of the plasma catalytic reactor (20) can be increased, the nitrogen oxide purifying device (2)
Ability can also be enhanced.

-Modification of Embodiment 2- (Modification 1) Embodiment 2 is an example in which a plasma catalytic reactor (20) using discharge plasma by streamer discharge is applied to a nitrogen oxide purifying apparatus (2). However, the plasma catalytic reactor (20) can also be applied to a flue gas purifying device (3). The flue gas purifying device (3) treats nitrogen oxides in flue gas by reductive decomposition and the like, and treats unburned fuel and hydrocarbons by oxidative decomposition. In this case, a catalyst suitable for reduction of nitrogen oxides and oxidation of unburned fuel and hydrocarbons is selected from the catalyst materials described in the first embodiment.

The structure of the flue gas purifying device (3) is shown in FIG. 4 together with the nitrogen oxide purifying device (2).
The configuration is the same and only the application is different. For this reason,
Although a detailed description of the configuration of the flue gas purifying device (3) is omitted, this device (3) also uses the active species contained in the low-temperature plasma-like gas effectively by specifying the catalyst substance. As a result, the chemical reaction is promoted, so that the processing performance of the gas to be treated can be greatly improved.

(Modification 2) The plasma catalytic reactor of the present invention
(20) is an air purification device (1), a nitrogen oxide purification device (2),
In addition to the combustion exhaust gas purifying device (3), the present invention can be applied to a dioxin decomposing device (4). The dioxin decomposer (4) treats dioxin in combustion exhaust gas by oxidative decomposition. In this case, a catalyst suitable for the oxidative decomposition of dioxin is employed from the catalyst materials described in the first embodiment.

The dioxin decomposing device (4) can have the same constitution as the nitrogen oxide purifying device (2). Also in this device (4), by using the catalyst characterized by the present invention, the active species contained in the low-temperature plasma-like gas are effectively used to promote the chemical reaction, thereby improving the processing performance of the gas to be treated. Can be greatly enhanced.

(Modification 3) Further, the plasma catalytic reactor (20) of the present invention comprises an air purifying device (1), a nitrogen oxide purifying device,
(2) In addition to the flue gas purifying device (3) and the dioxin decomposing device (4), the present invention can be applied to a chlorofluorocarbon gas decomposing device (5). The fluorocarbon gas decomposing device (5) decomposes the fluorocarbon gas by passing the fluorocarbon gas through the discharge field (D) of the discharge means (21, 22) and the processing member (23). In this case, a catalyst suitable for decomposing the chlorofluorocarbon gas is employed as the catalyst from the catalyst materials described in the first embodiment.

The chlorofluorocarbon gas decomposer (5) can have the same constitution as the nitrogen oxide purifier (2) and the like. Also in this device (5), the use of the catalyst characterized by the present invention makes it possible to effectively utilize the active species generated by the low-temperature plasma to promote the chemical reaction. Can be greatly enhanced.

[0070]

Embodiment 3 In Embodiment 3 of the present invention, in the plasma catalytic reactor (20), the discharge method is changed from that of each of the above embodiments to generate low-temperature plasma by pulse corona discharge. Things. That is, in the first and second embodiments, the streamer discharge is caused to occur in a wide conical area between the electrodes (21, 22), whereas in the third embodiment, the streamer discharge is narrower. Pulse corona discharge is caused in the columnar region. Note that the pulse corona discharge is also a kind of streamer discharge, but is referred to as a pulse corona discharge here in order to distinguish it from the first and second embodiments. In the third embodiment, only the structure of the discharging means (21, 22) will be described with reference to FIG.

In the third embodiment, a rod-shaped electrode is used as the discharge electrode (21). As shown by phantom lines, a plurality of the rod-shaped electrodes are fixed to an electrode plate such as a mesh material or a punched metal as in the first embodiment. As the counter electrode (22), a plate-like electrode having an opening such as a mesh material or a punched metal is used as in the first embodiment. A pulse power supply (24) (not shown) is connected to both electrodes (21, 22), and a discharge electrode (21)
A pulse corona discharge is generated between the electrode and the counter electrode (22).

Since the discharge field (D) by the pulse corona discharge of the present embodiment is a columnar area narrower than the discharge field (D) of the streamer discharge described in each of the above embodiments, the discharge electrode (D) The linear electrode as (21) may be arranged more densely than the needle electrode (21a) of the first embodiment.

Even if the pulse corona discharge is generated between the two electrodes (21, 22), active species are generated in the discharge field (D) by low-temperature plasma. This active species includes
It contains radicals such as fast electrons, ions, ozone, and hydroxyl radicals that promote the reaction in the plasma catalytic reactor, and other excited molecules (excited oxygen molecules, excited nitrogen molecules, excited water molecules, and the like).

As in the first embodiment, the processing member (23) is provided with a counter electrode in a discharge field (D) formed between the two electrodes (21, 22).
A catalyst similar to that of the first embodiment is used, which is arranged near (22). For this reason, various active species generated by the low-temperature plasma are effectively used in the process of purifying the air, so that the chemical reaction in treating the air to be treated can be drastically promoted. Therefore, since the processing capacity of the plasma catalytic reactor (20) can be increased, the capacity of the air purification device (1) and the like can also be increased.

As a discharge method for generating low-temperature plasma, a discharge method such as corona discharge, creeping discharge, silent discharge, partial discharge, or glow discharge is employed in addition to the streamer discharge and pulse corona discharge described above. You may. Therefore, these discharge methods will be briefly described below.

-Modification of Embodiment 3- (Modification 1) First, an example of corona discharge as a discharge method of the plasma catalytic reactor (20) will be described with reference to FIG. When this discharge method is adopted, for example, the air purification device (1) can be configured as shown in FIG.

In this example, the discharge electrode (21) and the counter electrode (22)
Are each used a plate-like electrode plate.
Although not shown, the (21, 22) has a large number of openings so that air can pass in a direction perpendicular to the plane. For example, a mesh material, a punching metal, or the like can be used for each of the electrodes (21, 22). Also, a DC or AC high voltage power supply (not shown) is connected to both electrodes (21, 22), and discharge electrodes are formed.
It is configured such that corona discharge occurs between (21) and the counter electrode (22).

It is preferable that the discharge electrode (21) has minute projections formed on the surface on the side of the counter electrode, so that the discharge can be stably generated.

Further, between the two electrodes (21, 22), a processing member (23) containing the same catalyst (the Mn oxide and the specific oxide) as in the above embodiments is arranged. Processing material (2
3) is arranged near the counter electrode (22) in the discharge field (D) formed between the electrodes (21, 22).

Also, as shown in FIG.
(1) has a plasma catalytic reactor (20) in a casing (10).
And a dust collection filter (11) and a centrifugal fan (12) are provided.
It is configured to blow out from (16).

Even when the corona discharge is employed, active species are generated in the discharge field (D) by low-temperature plasma. The active species include radicals such as electrons, ions, ozone, and hydroxyl radicals, and other excited molecules (excited oxygen molecules, excited nitrogen molecules, excited water molecules, and the like). Therefore, by using the catalyst characterized by the present invention, various active species generated by the low-temperature plasma can be effectively used for the treatment at the time of air purification, so that the chemical reaction at the time of treating the air to be treated is dramatically improved. The processing capacity of the plasma catalytic reactor (20), and thus the processing capacity of the air purification device (1), can be increased.

Although the air purifier (1) has been described in this example, the plasma catalytic reactor (20) for generating low-temperature plasma by corona discharge also has a nitrogen oxide purifier (2), It can be applied to a combustion exhaust gas purifying device (3), a dioxin decomposing device (4), a chlorofluorocarbon gas decomposing device (5), and the like.

As the power supply, a pulse high voltage power supply may be used instead of a DC or AC high voltage power supply. When a pulsed high voltage power supply is used, discharge can be generated with higher energy, so that the activity of low-temperature plasma generated in the discharge field (D) can be further increased. Then, since these active species react with harmful components of the air to be treated in the presence of the catalyst and decompose these components, higher treatment performance can be obtained.

As described above, when the low-temperature plasma is generated by using the pulsed high voltage, and the catalyst to be processed is processed by combining the catalyst characterized by the present invention with the low-temperature plasma, the chemical reaction when processing the air to be processed is performed. Can be drastically promoted. And, by effectively utilizing the active species, the processing capacity of the plasma catalytic reactor (20) can be greatly increased, so that the capacity of the air purification device (1) and the like can also be greatly increased.

(Modification 2) Next, a plasma catalytic reactor (2
As a discharge method for generating low-temperature plasma in 0), a creeping discharge may be adopted. An example of this discharge method will be described with reference to FIG.

In this modified example 2, an electrode plate made of a dielectric substrate (25a) such as ceramic is used as the discharging means (21, 22).
(25) is used. The electrode plate (25) is provided with a discharge electrode (21) and a counter electrode (22) inside and on the surface of the dielectric substrate (25a). Then, a high-frequency AC voltage (or a high-frequency pulse voltage) is applied between the two electrodes (21, 22) from a power source (not shown) to generate a creeping discharge, and the air to be processed and the gas to be processed are turned into plasma. .

In this case, the entire surface around the electrode plate (25)
(D), a low-temperature plasma is generated in this discharge field (D), and active species are released. Then, on the downstream side of the electrode plate (25), the treatment member (2
3) is arranged so that active species generated by the plasma are supplied to the processing member (23).

Also in this modified example 2, since the same catalytic substance as in the above embodiments is used for the processing member (23), the air to be processed is effectively used by effectively utilizing the active species generated by the low-temperature plasma. (Or the gas to be treated) can be treated, and the chemical reaction during the treatment can be drastically promoted. Therefore, since the processing capacity of the plasma catalytic reactor (20) can be increased, the capacity of the air purification device (1) and the like to which the reactor (20) is applied can be greatly increased.

(Modification 3) Modification 3 of Embodiment 3 employs silent discharge as a discharge method in the plasma catalytic reactor (20). In the third modification, only the configuration of the discharging means (21, 22) will be described with reference to FIG.

In this plasma catalytic reactor (20), the discharge electrode (21) and the counter electrode (22) are each constituted by a plate-like electrode. An insulating plate (26) is laminated on each of the discharge electrode (21) and the counter electrode (22), and both electrodes (21, 22) are
26) They are arranged facing each other with the inside. And both electrodes
A high-voltage power supply (not shown) for applying a high-frequency AC voltage (or a high-frequency pulse voltage) is connected to (21, 22).

The discharge electrode (21) and the counter electrode (22) are arranged substantially parallel to the flow direction of the fluid to be processed so that the fluid to be processed flows between them. And, on the downstream side of the discharge field (D) formed between the discharge electrode (21) and the counter electrode (22),
Processing member (23) containing the catalyst substance described in each of the above embodiments
Is arranged.

In this configuration, when a high-frequency AC voltage or a high-frequency pulse voltage is applied between both electrodes (21, 22),
A discharge field (D) of silent discharge is formed via the insulating plate (26). Then, various active species are generated by the silent discharge, and the active species flow to the processing member (23). Therefore,
The active species efficiently reacts with harmful components of the air to be treated in the presence of the catalyst to decompose these components.

Also in this example, since the same catalytic substance as described above is used, the air (or the gas to be processed) can be treated by effectively utilizing the active species generated by the low-temperature plasma. And the chemical reaction at that time can be drastically promoted. Therefore, since the processing capacity of the plasma catalytic reactor (20) can be increased, the capacity of the air purification device (1) and the like to which the reactor (20) is applied can be greatly increased.

(Modification 4) Modification 4 of Embodiment 3 employs partial discharge as a discharge method in the plasma catalytic reactor (20). In this example, only the structure of the discharging means (21, 22) will be described with reference to FIG.

In this plasma catalytic reactor (20), the discharge electrode (21) is constituted by a linear electrode, and the counter electrode (22) is a cylindrical (cylindrical) electrode arranged around the discharge electrode (21). It consists of. A high-voltage power supply (not shown) for applying a high-frequency AC voltage (or a high-frequency pulse voltage) is connected to both electrodes (21, 22). In this configuration, a discharge field (D) is formed inside the cylindrical counter electrode (22). Note that a cylindrical (or rod-shaped) electrode thicker than the linear electrode shown in the figure may be used as the discharge electrode (21).

The inside of the counter electrode (22) is filled with catalyst particles (23) containing the above-mentioned catalyst substance (manganese oxide and specific oxides such as iron and cerium), which is a feature of the present invention. I have. That is, the catalyst particles (23) are arranged in the discharge field (D), and the plasma catalyst reactor (20) takes the form of a so-called packed bed reactor. Catalyst particles (23)
Is the one in which the above-mentioned catalyst substance is supported on the surface of ferroelectric particles such as barium titanate.

In this configuration, when a high-frequency AC voltage or a high-frequency pulse voltage is applied between the two electrodes (21, 22), the discharge electrode (21) moves from the counter electrode (22) through the ferroelectric catalyst particles (23). , A partial discharge is generated, and various active species are generated in the discharge field (D). The generated active species reacts with harmful components of the air to be treated in a highly active state in the presence of the catalyst substance contained in the catalyst particles (23) to decompose these components.

Also in this example, since the same catalytic substance as described above is used, the air (or the gas to be treated) can be treated by effectively utilizing the active species generated by the low-temperature plasma. And the chemical reaction at that time can be drastically promoted. Therefore, since the processing capacity of the plasma catalytic reactor (20) can be increased, the capacity when the reactor (20) is applied to the air purification device (1) and the like can be greatly increased.

(Modification 5) Modification 5 of Embodiment 3 employs glow discharge as a discharge method in the plasma catalytic reactor (20). In this example, only the configuration of the discharging means (21, 22) will be described with reference to FIG.

In this example, a rod-shaped electrode is used as the discharge electrode (21), and a plate-shaped electrode having an opening such as a mesh material or a punched metal is used as the counter electrode (22). A high-voltage power supply (not shown) is connected to both electrodes (21, 22) so that a glow discharge is generated at an end of the discharge electrode (21) near the counter electrode (22). In this case, a discharge field (D) is formed at the tip of the discharge electrode (21) on the side of the counter electrode (22).

Even if glow discharge is generated by the two electrodes (21, 22), active species are generated in the discharge field (D). Like the above-described discharge methods, the active species include high-speed electrons, ions, ozone, hydroxyl radicals, and other radicals that promote the treatment reaction of the fluid to be treated in the plasma catalytic reactor (20), and other excited species. Molecules (excited oxygen molecules, excited nitrogen molecules, excited water molecules, etc.).

The processing member (23) is disposed between the two electrodes (21, 22) in the vicinity of the counter electrode (22) in the same manner as in the respective examples described above. Used. For this reason, various active species generated by the low-temperature plasma are effectively used in the process of performing air purification, so that the chemical reaction in processing the air to be processed can be drastically promoted. Therefore, the plasma catalytic reactor (2
0), the air purification device
Capabilities such as (1) can also be improved.

[0103]

Next, in the plasma catalytic reactor (20), the treatment performance of the fluid to be treated was determined for the embodiment using the catalyst characteristic of the present invention and the comparative examples 1 and 2 using the conventional catalyst. Explanation will be made while comparing and contrasting.

First, as described in the first embodiment, a catalyst comprising manganese, iron and cerium was prepared by a coprecipitation method, and this was formed from a honeycomb substrate (23a). Used for processing member (23). The composition ratios of manganese, iron and cerium in the catalyst of this example were 30%, 60% and 10%, respectively.

As the catalyst of Comparative Example 1, a commercially available manganese oxide-based catalyst was used as a catalyst conventionally used in combination with low-temperature plasma. This catalyst contained manganese and aluminum, and the composition ratio of manganese and aluminum was 60% and 40%, respectively.

As the catalyst of Comparative Example 2, a commercially available platinum-based catalyst was used as a catalyst conventionally used in combination with low-temperature plasma. This catalyst contained platinum and aluminum, and the composition ratios of platinum and aluminum were 0.5% and 99.5%, respectively.

Next, experiments performed using the catalysts of the above-described example and comparative examples 1 and 2 will be described. First, in the experiment, an experimental apparatus having a reaction unit configured as shown in FIG. 12 was used. This experimental device is configured to generate a streamer discharge. In this device, the discharge electrode
(21) is a 2 mm diameter, 8 mm long brass needle electrode (21a),
Three needle electrodes (21a) were arranged horizontally at intervals of 17.5 mm, and two rows of needle electrodes (21a) were vertically arranged at intervals of 20 mm. A 61 × 80 mm stainless mesh material was used for the counter electrode (22). Then, the discharge electrode (21) and the counter electrode (22)
The gap of 22 mm, the needle electrode (21a) and the counter electrode (22) of stainless steel mesh material are arranged so as to be at right angles,
It was configured to apply a DC high voltage (20 Kv).

The catalysts of Examples and Comparative Examples 1 and 2 supported on a honeycomb-shaped treatment member (23) having a thickness of 10 mm were placed between a discharge electrode (21) and a counter electrode (22). With counter electrode
The gap between the tip of the needle electrode (21a) and the processing member (23) was set to 12 mm. Needle electrode (2
As shown in FIG. 13, the tip of 1a) is obtained by shaving the tip with a shaving angle (θ) of 60 °.
The spherical shape of mm was slightly rounded.

When the tip angle (θ) of the needle electrode (21a) is set to about 60 degrees, the flare from the discharge electrode (21) toward the counter electrode (22) as described in the first embodiment. Streamer discharge occurs in a wide range spreading like a circle.

In the above apparatus configuration, toluene 100
ppm of the fluid to be treated at three different space velocities (1000
h-1, 2000 h-1, 5000 h-1) and introduced into the experimental apparatus, and when a voltage of 20 Kv was applied, the amount of attenuation of the reactant and the amount of increase in the product were measured, and the amount of odor component of each catalyst was measured. The measurement results obtained by examining the oxidative decomposition characteristics (processing characteristics) are shown in the graph of FIG.

According to FIG. 14, the catalyst of this example has a higher decomposition efficiency than the comparative catalysts 1 and 2, which are conventional catalysts, and thus shows that the activity is very high. Specifically, the inventive catalyst is transient and has an oxidative decomposition performance of 70% or more when the space velocity is 1000 h-1, and is about 1.5 times that of a commercially available platinum-based catalyst and about 1.5 times that of a commercially available manganese-based catalyst. It has about twice the performance.

From the above, it can be seen that the use of the catalyst of this embodiment promotes the chemical reaction when treating the fluid to be treated in the plasma catalytic reactor (20), thereby greatly improving the treatment performance.

[0113]

Other Embodiments of the Invention The present invention may be configured as follows with respect to the above embodiment.

For example, Embodiment 1 (FIGS. 1 to 3), Embodiment 2 (FIG. 4), Embodiment 3 (FIG. 5), and Embodiment 3
In the first modification (FIG. 6), the processing member (23) is connected to the discharge electrode (21).
Although it is arranged near the counter electrode (22) in the discharge field (D) formed between the counter electrode (22) and the counter electrode (22), the processing member (23) is a modification example 2 of the third embodiment (FIG. 8). As in the third modification (FIG. 9) and the fifth modification (FIG. 11), they may be arranged downstream of the discharge field (D) as shown in FIG.

In the partial discharge method shown in FIG. 10, instead of filling the cylindrical counter electrode (22) with catalyst particles,
As shown in FIG. 16, a cylindrical honeycomb processing member (23) having the catalyst substance of the present invention may be mounted in the counter electrode (22). In this case, the ventilation resistance is smaller than in the example of FIG. 10, and the processing gas amount can be increased.

As shown in FIG. 17, catalyst particles or a honeycomb processing member (23), a cylindrical glass tube (insulating tube) (27), and a cylindrical electrode (discharge electrode) (21) as a center. The shape electrodes (counter electrodes) (22) may be arranged so as to be sequentially stacked from the inside. In this case, a ferroelectric is used as a base material of the processing member (23). With this configuration, the discharge electrodes (2
When the electrons emitted from 1) move radially outward through the honeycomb-shaped processing member (23) and accumulate charges on the inner surface of the glass tube (27), the charges act to reduce the potential difference. Thus, stable discharge can be generated without sparking.

Also in the case of FIGS. 16 and 17, the use of the catalyst characterized by the present invention as described above allows the active species generated by the low-temperature plasma to be effectively used to form the fluid to be treated. Since the chemical reaction can be promoted, the processing performance of the reactor (20) can be improved.

In the examples of FIGS. 16 and 17, a pulse power supply or an AC power supply may be used.

On the other hand, in the above embodiment, the processing member (23) is configured to have both functions of the catalyst means and the adsorption means.
These processing members may be separately arranged in the discharge field (D) or on the downstream side thereof, as a configuration in which the second processing member constituting the adsorption means is separated from the second processing member.

In each of the above embodiments, the plasma catalytic reactor (20) is replaced with the air purifying device (1), the nitrogen oxide purifying device,
(2) and an example in which the present invention is applied to a flue gas purifying device (3) and the like has been described.This plasma catalytic reactor (20) is used for processing other fluids such as an air conditioner and a garbage disposal machine. It is also possible to apply to the device.

Further, in the above embodiment, a catalyst composed of manganese, iron, and cerium is used as the catalyst. However, the catalyst used in the present invention is composed of manganese oxide, iron, cerium, europium, What is necessary is just to contain a mixture or complex oxide with lanthanum and at least one oxide of copper.

In the above embodiment, a high DC voltage is applied to generate a streamer discharge in a wide area in the electrode configuration in which the tip shape of the needle electrode (21) is specified. Regardless of the shape, the use of a pulsed high-voltage power supply makes it possible to generate a streamer discharge in a wide area.

Specifically, for example, when a pulse high voltage with a short pulse rise time of about 100 ns or less and a pulse width of about 1 μs or less is applied between both electrodes, the pulse spreads in a flare toward the counter electrode. Streamer discharge can be caused in a relatively wide range. The reason for specifying the pulse waveform in this way is that the streamer discharge is generated in a wide area because the voltage application time is short.
It is possible to instantaneously apply a high voltage that would cause a spark in normal discharge.It is easy to cause discharge at all places when the applied voltage is increased. And the fact that uniform discharge is likely to occur because of a short rise time.

[Brief description of the drawings]

FIG. 1 is a structural diagram of an air purification device provided with a plasma catalytic reactor according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view schematically showing a configuration of a plasma catalytic reactor and a discharge method (streamer discharge) in the air purification device of FIG.

FIG. 3 is a perspective view schematically showing a configuration of a plasma reactor in the air purification device of FIG.

FIG. 4 is a view schematically showing a configuration of a nitrogen oxide purifying apparatus according to a second embodiment.

FIG. 5 is a schematic diagram showing a discharge method (pulse corona discharge) of the plasma catalytic reactor according to Embodiment 3.

FIG. 6 is a schematic diagram showing a discharge method (corona discharge) of a plasma catalytic reactor according to a first modification of the third embodiment.

7 is a cross-sectional view schematically showing a configuration of an air purification device to which the plasma catalytic reactor of FIG. 6 is applied.

FIG. 8 is a schematic diagram illustrating a discharge method (creep discharge) of a plasma catalytic reactor according to a second modification of the third embodiment.

FIG. 9 is a schematic diagram showing a discharge method (silent discharge) of a plasma catalytic reactor according to a third modification of the third embodiment.

FIG. 10 is a schematic diagram showing a discharge method (partial discharge) of a plasma catalytic reactor according to a fourth modification of the third embodiment.

FIG. 11 is a schematic diagram showing a discharge method (glow discharge) of a plasma catalytic reactor according to a fifth modification of the third embodiment.

FIG. 12 is a schematic configuration diagram of an experimental apparatus in an example.

FIG. 13 is an enlarged view showing a tip shape of a discharge electrode in the experimental apparatus of FIG.

FIG. 14 is a graph showing experimental results of the example.

FIG. 15 is a view showing a modification in which a processing member is arranged downstream of a discharge field.

FIG. 16 is a diagram showing a modification of the partial discharge method of FIG.

FIG. 17 is a diagram showing a second modification of the partial discharge method of FIG.

[Explanation of symbols]

 (1) Air purifier (2) Nitrogen oxide purifier (3) Combustion exhaust gas purifier (4) Dioxin decomposer (5) Freon gas decomposer (10) Casing (11) Dust collection filter (12) Centrifugal fan (15 ) Air inlet (gas inlet) (16) Air outlet (gas outlet) (20) Plasma catalytic reactor (21) Discharge electrode (22) Counter electrode (23) Processing member (catalyst means, adsorption means) ( 24) High voltage power supply

────────────────────────────────────────────────── ─── of the front page continued (51) Int.Cl. ⁷ identification mark FI theme Court Bu (reference) C07D 319/24 B01D 53/36 B H05H 1/48 B01J 23/84 311A (72) inventor Kanji Mogi Osaka 1304 Kanaokacho, Sakai City Daikin Industries, Ltd. Sakai Seisakusho Kanaoka Factory F-term (reference) 4C080 AA07 BB02 BB10 CC01 HH05 JJ03 KK02 MM02 QQ01 4D048 AA06 AA11 AA18 AB03 BA18X BA19X BA28X BA35X BA36X BA42X BB02 AB03A03 A03B03A03A BC42A BC42B BC43A BC43B BC44A BC44B BC62A BC62B BC66A BC66B CA10 CA13 CA15 CA19 DA06 EA19 FB09 4G075 AA03 AA37 BA05 CA15 CA16 CA17 CA18 CA54 DA02 EB01 EB21 EB42 EB43 EC21 FA03 FA08 FC15

Claims (10)

[Claims] A discharge means for generating low-temperature plasma by discharge in a flow space of a fluid to be treated;
A catalyst means (23) disposed in the discharge field (D) or downstream of the discharge field (D) in (21, 22), wherein the catalyst means (23) comprises: A plasma catalytic reactor comprising, as a catalyst material, a mixture or a composite oxide of manganese oxide and at least one oxide of iron, cerium, europium, lanthanum, and copper. 2. The plasma catalytic reactor according to claim 1, wherein the catalyst means has a composition ratio of manganese oxide in the catalyst substance of 20% to 50%. 3. The plasma catalytic reactor according to claim 1, wherein the catalytic means includes a plurality of manganese oxides having different oxidation numbers as the catalytic substance. 4. The discharge means (21, 22) comprises a streamer discharge,
Pulse corona discharge, corona discharge, creeping discharge, silent discharge,
4. The plasma catalytic reactor according to claim 1, wherein the plasma catalytic reactor is configured to generate low-temperature plasma by partial discharge or glow discharge. 5. An adsorbing means (23) for adsorbing a component to be treated contained in a fluid to be treated, in the discharge field (D) of the discharge means (21, 22) or downstream of the discharge field (D). 5. A plasma catalytic reactor according to claim 1, 2, 3 or 4, which is arranged together with the catalyst means (23). 6. The plasma catalytic reactor according to claim 1, 2, 3, 4, or 5, further comprising: a casing (10) in which the plasma catalytic reactor (20) is housed. Discharge means by introducing air to be treated into casing (10)
(21, 22) through the discharge field (D) and the catalyst means (23) to treat odorous or harmful components in the air to be treated. apparatus. 7. A plasma catalytic reactor (20) according to claim 1, 2, 3, 4 or 5, and a casing (10) in which the plasma catalytic reactor (20) is housed. Discharge means by introducing the gas to be treated into the casing (10)
(21, 22) through a discharge field (D) and a catalyst means (23) to treat nitrogen oxides in the gas to be treated. apparatus. 8. A plasma catalytic reactor (20) according to claim 1, 2, 3, or 5, and a casing (10) in which the plasma catalytic reactor (20) is housed. Discharge means by introducing combustion exhaust gas into casing (10)
(21, 22) by passing through the discharge field (D) and the catalyst means (23) to treat nitrogen oxides in the flue gas and to treat unburned fuel and hydrocarbons. A flue gas purifying device characterized by the following. 9. A plasma catalytic reactor (20) according to claim 1, 2, 3, 4 or 5, further comprising: a casing (10) in which the plasma catalytic reactor (20) is housed. Discharge means by introducing combustion exhaust gas into casing (10)
A dioxin decomposer characterized in that dioxin in the combustion exhaust gas is treated by passing through a discharge field (D) of (21,22) and a catalyst means. 10. The plasma catalytic reactor according to claim 1, 2, 3, 4, or 5, further comprising: a casing (10) in which the plasma catalytic reactor (20) is housed. Discharge means by introducing Freon gas into casing (10)
A flon gas decomposer characterized in that the flon gas is decomposed by passing through a discharge field (D) of (21,22) and a catalyst means (23).