JP2870376B2 - High frequency heating element with catalytic function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses high-frequency energy to heat and raise the temperature to catalytically decompose harmful substances such as hydrocarbons and carbon monoxide in exhaust gas discharged from internal combustion engines such as automobiles. The present invention relates to a high-frequency heating element.

[0002]

2. Description of the Related Art In automobiles that use gasoline as fuel, there is a movement to tighten regulations on the emission of hydrocarbons, carbon monoxide, and nitrogen oxides contained in exhaust gas. One of the purification methods of these pollutants is a post-treatment system using a catalyst. A typical catalyst is to control the air-fuel ratio to near the stoichiometric air-fuel ratio to oxidize hydrocarbons and carbon monoxide and reduce nitrogen oxides. At the same time, there is a catalytic body (three-way catalyst) that converts it into harmless carbon dioxide, water vapor, and nitrogen.

[0003] This catalyst is made of cordierite having a main component of silica, alumina and magnesia of 300 to 400 ce.
ll / inch ² monolithic carrier, or a metallic carrier (called a metal carrier) obtained by corrugating an iron-chromium-aluminum alloy, and a coating layer called a wash coat composed of fine particles such as alumina with a large surface area Or providing an oxide film layer of the metal carrier,
The coating layer or the oxide film layer is formed by supporting noble metal fine particles such as platinum, palladium and rhodium, and the catalytic function is exerted by heating the exhaust gas.

Recently, an electric heater system has been studied in which an electric current is directly applied to the metal carrier to rapidly heat the catalyst body in order to exert a catalytic function in a short time.

[0005]

However, in the above-mentioned conventional structure, the catalyst requires a catalyst layer temperature of 350 ° C. or higher to exhibit the catalytic function. It takes about one minute to reach the temperature at which the catalyst functions as a catalyst, and until then, there has been a problem that harmful exhaust gas is directly discharged to the atmosphere.

[0006] A heater-type catalyst body that heats rapidly by energizing a metal carrier improves the temperature rising speed as compared with a catalyst body that is heated only by exhaust gas. In addition, there is a problem that large power is required to raise the temperature, and there is a problem that reliability such as electrical insulation is lacking.

The present invention solves the above-mentioned problems, and has a catalytic function of reducing harmful substances such as hydrocarbons and carbon monoxide in exhaust gas discharged when starting an engine of an automobile or the like by using high-frequency heating. It is intended to provide a high-frequency heating element.

In order to achieve the above object, the high-frequency heating element having a catalytic function of the present invention is formed by adding an organic porous body to a ceramic.
A high-frequency absorber formed by forming a high-frequency absorbing layer made of at least one whisker of silicon carbide or zinc oxide that absorbs high-frequency energy and generates heat in a porous ceramic obtained by coating and firing a material ; A catalyst layer is formed by forming a carrier layer made of ceramic fine particles and carrying a catalyst on the carrier layer.

The high-frequency heating element having a catalytic function of the present invention comprises a high-frequency absorber obtained by coating and firing silicon carbide , which absorbs high-frequency energy and generates heat, on an organic porous body, and ceramic fine particles on a ceramic support. And a catalyst body that forms a carrier layer and carries a catalyst on the carrier layer.

[0010] High frequency to further absorb high frequency absorbing layer or high-frequency energy absorbing and heat-generating high-frequency energy heating
The wave absorber carries at least one kind of metal fine particles made of platinum, palladium, and rhodium.

[0011]

In the above construction, when high-frequency energy is supplied to the high-frequency heating element (high-frequency absorber and catalyst body) having the catalytic function of the present invention, the high-frequency absorber is heated by absorption of high-frequency energy and heat conversion. You. At the same time, the catalyst disposed adjacent to the high frequency absorber is heated to a temperature at which it functions as a catalyst, and carbon monoxide and hydrocarbons in exhaust gas discharged from automobiles and the like are converted into harmless carbon dioxide by the heated catalyst. It is converted to gas and water vapor and released to the atmosphere.

[0012] The high-frequency absorber has an organic skeleton.
It is obtained by coating the porous body with a ceramic material and firing it.
High-frequency energy can be applied to porous ceramics or organic porous materials.
Coating and firing silicon carbide that absorbs and generates heat
It is made of a porous material obtained by
Has a honeycomb structure made of ceramic powder
Molded body or honeycomb made from ceramic fiber
It is lighter in weight and can have a smaller heat capacity than a structure made of a molded body having a cam structure . Therefore, the high-frequency absorber can be rapidly heated by high-frequency energy and the heat energy is applied to the flow of exhaust gas or the like.
The catalyst can be efficiently transmitted to the catalyst body disposed downstream, and the temperature can be raised to a temperature that functions as a catalyst in a short time.

By supporting fine metal particles such as platinum on the high-frequency absorber, the high-frequency absorber can be more uniformly heated, and the fine metal particles have a catalytic function. Can be done.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partial sectional view of a high-frequency heating element having a catalytic function according to an embodiment of the present invention. In FIG. 1A, reference numeral 1 denotes a high-frequency absorber, which is a silicon carbide that absorbs high-frequency energy in the porous ceramic body 2 and generates heat.
A high-frequency absorption layer 3 made of at least one whisker of silicon or zinc oxide is formed. As shown in the figure,
The wave absorbing layer 3 is made of a plurality of silicon carbide or zinc oxide
Parts of the car overlap each other to create a continuous connection
It is formed with. The ceramic porous body 2 has a three-dimensional net-like skeleton structure having uniform continuous pores as shown in FIG. Also, in FIG.
Is a catalyst body, a carrier layer 6 made of ceramic fine particles for increasing the specific surface area is formed on a ceramic support 5 and a catalyst 7 is carried on the carrier layer 6. The high-frequency heating element having a catalytic function according to the present invention includes both the high-frequency absorber 1 and the catalyst 4.

The ceramic porous body 2 is obtained by coating an organic porous body such as polyurethane (for example, polyurethane foam) as a base material with a ceramic material and firing it. At least one of alumina, silica, magnesia, and zirconia having excellent mechanical strength is applied.

[0017] Zinc as a material for forming the high frequency absorbing layer 3 is an excellent semiconductor material to the high frequency absorption properties, copper, manganese, cobalt, iron, tin, oxide mainly composed of titanium, silicon, carbide, the metal there is a composite oxide particularly silicon carbide and acids such as perovskite-type composite oxide containing
What consists of at least one kind of whisker of zinc oxide is applied. Why whiskers and silicon carbide zinc oxide is excellent in absorption and heat generation characteristics of the high frequency energy, conductive properties suitable for absorbing high-frequency, it is considered to have dielectric properties. Especially silicon carbide whis as a high frequency absorbing material
By using a car , it is possible to realize better absorption and heat generation characteristics of high-frequency energy, heat resistance in an exhaust gas atmosphere, and chemical stability.

On the other hand, the ceramic support 5 has the same material and structure as the ceramic porous body 2, and is a honeycomb formed by extruding a cordierite material mainly containing silica, alumina, and magnesia used in a conventional catalyst. A honeycomb structure obtained by corrugating a porous sheet made of a ceramic fiber such as silica, alumina, or zirconia is applied.

Carrier layer 6 formed on ceramic support 5
Is for improving the dispersibility of the supported catalyst 7 and increasing the catalytic activity (enlarging the specific surface area), and is made of at least one of silica, alumina, zirconia, and ceria excellent in heat resistance. Is applied.

Platinum is used as the catalyst 7 for decomposing harmful substances.
Palladium, noble metals of rhodium, copper, manganese, oxides of cobalt, perovskite-type composite oxides,
At least one of these applies.

The high-frequency absorbing material forming the porous ceramic body 2 and the high-frequency absorbing layer 3 and the ceramic fine particles forming the ceramic support 5 and the carrier layer 6 are bonded with an inorganic binder, and the catalyst 7 is formed of the inorganic binder. It is carried by adhesion or immersion and drying treatment of the catalyst solution. The inorganic binder is not particularly limited, but is preferably a colloidal particle of alumina, silica, zirconia or the like having excellent heat resistance and adhesiveness.

The high frequency absorber 1 is manufactured as follows. A slurry composed of an inorganic binder and a solvent (usually water) is prepared in the high frequency absorbing material, and the ceramic porous body 2 is immersed in the slurry, or the slurry is applied to the ceramic porous body 2 by brushing or spraying. Then, after the high-frequency absorbing material and the inorganic binder are attached to form the high-frequency absorbing layer 3, drying or firing is performed. The composition of the slurry is appropriately set depending on the amount of the required high frequency absorbing material to be adhered, the amount of the inorganic binder capable of maintaining the adhesive strength, the operation during the immersion treatment, and the like.

On the other hand, the catalyst body 4 is manufactured as follows. A slurry comprising ceramic fine particles such as silica and alumina, an inorganic binder and a solvent (usually water) is prepared, and the ceramic support 5 is immersed in the slurry,
Alternatively, the slurry is applied to a ceramic support 5 by a method such as brushing or spraying to form a carrier layer 6 made of ceramic fine particles, and then dried or fired.
Next, a catalyst solution in which a metal catalyst 7 or a metal compound containing the catalyst 7 is dispersed (or dissolved) is prepared, and the ceramic support 5 on which the carrier layer 6 is formed is immersed in the catalyst solution. Alternatively, the catalyst solution is applied to the carrier layer 6 by spraying or the like, and then dried or fired. Alternatively, a predetermined amount of the catalyst 7 may be added in advance to a slurry composed of the above-mentioned ceramic fine particles, an inorganic binder, and a solvent, and the catalyst 7 may be supported simultaneously with the formation of the carrier layer 6.
When the catalyst 7 is a metal oxide, the loading of the catalyst is performed as follows. A slurry comprising the catalyst 7, the inorganic binder, and the solvent is prepared, and the ceramic support 5 is immersed in the slurry or applied by brushing or spraying, and then dried or fired.

Next, the operation of the high-frequency heating element having a catalytic function of the present invention will be described with reference to an exhaust gas purifying apparatus as an example.

FIG. 2 shows the high-frequency absorber 1 and the catalyst 4 of the present invention.
1 shows an example of an apparatus for purifying exhaust gas discharged from an automobile provided with a high-frequency heating element 8 having a catalytic function constituted by the following. In the figure, reference numeral 9 denotes an exhaust pipe for discharging exhaust gas of an internal combustion engine, 10 denotes a heating chamber provided in the middle of the exhaust pipe, and a high-frequency heating element 8 having a catalytic function of the present invention is housed in the heating chamber 10. You. At this time, the high-frequency heating element 8 having the catalytic function is disposed so as to be the high-frequency absorber 1 on the upstream side of the flow of the exhaust gas and the catalyst 4 on the downstream side. Reference numeral 11 denotes a support member for supporting the high-frequency heating element 8 having a catalytic function accommodated in the heating chamber 10, and the supporting member 11 includes an outer periphery of the high-frequency heating element 8 having the catalytic function, an inner wall of the heating chamber 10, and It also has a thermal insulation function between the two. Reference numeral 12 denotes a high-frequency oscillator that generates high-frequency energy to supply power to the heating chamber 10, and 13 denotes a waveguide that transmits high-frequency energy generated by the high-frequency oscillator 12 to the heating chamber 10. Reference numerals 14 and 15 denote high-frequency shielding means for limiting the heating chamber 10, which is formed of a metal plate having a large number of punched holes or a metal honeycomb structure having a large number of through holes.

When the engine of a gasoline-powered vehicle starts, the exhaust gas discharged from the engine and containing harmful substances such as carbon monoxide and hydrocarbons passes through an exhaust pipe 9 and flows into a high-frequency heating element 8 having a catalytic function. On the other hand, at the same time as or immediately before the start of the engine, the high-frequency oscillator 12 generates high-frequency energy according to a command from a control unit (not shown). When this high-frequency energy is transmitted to the heating chamber 10 through the waveguide 13, it is absorbed by the high-frequency absorber 1 (actually, the high-frequency absorption layer 3 formed on the ceramic porous body 2) and converted into heat. Is done. At the same time, the catalyst 4 disposed adjacent to and behind the flow of the exhaust gas of the high frequency absorber 1 is heated by the heat transfer from the high frequency absorber 1. When the temperature of the catalyst 7 supported on the carrier layer 6 of the catalyst body 4 reaches a temperature at which the catalyst 7 functions as a catalyst, carbon monoxide and hydrocarbons, which are harmful substances in the exhaust gas, react with oxygen contained in the exhaust gas. It is decomposed into harmless water vapor and carbon dioxide gas. The harmless exhaust gas passes through the muffler and is exhausted to the atmosphere through the exhaust pipe 9.

(Example 1) A molded body (volume: 50 cc, 15 cells / inch2) made of alumina, silica, and magnesia as the ceramic porous body 2;
Silicon carbide is used as a high-frequency absorbing material forming the high-frequency absorbing layer 3.
Using the elementary whiskers, the high-frequency absorber 1 was produced. Further, the same ceramic porous body (capacity: 100 cc, 15 cells / inch2) as the above, alumina as the ceramic fine particles constituting the carrier layer 6, platinum as the catalyst 7 for decomposing harmful substances, and the catalyst body 4 were used as the ceramic support 5. Produced.
Note that alumina sol was used as the inorganic binder. The high-frequency absorber 1 and the catalyst 4 are housed in the heating chamber 10 of the exhaust gas purifying apparatus (high-frequency power consumption 1.5 kW) shown in FIG. 2 so that the high-frequency absorber 1 is on the upstream side of the exhaust gas. The engine (displacement amount: 2000 cc) was operated so that the exhaust gas temperature was 300 to 350 ° C. at an amount of about 300 l / min, and the purification performance of hydrocarbons by a hydrocarbon analyzer was evaluated. % Purification rate was obtained.

When noble metals such as rhodium and palladium and metal oxides of copper, manganese, iron and cobalt were used instead of platinum as the catalyst 4, a purification rate of 45 to 65% was obtained after 30 seconds of high frequency power supply. Was.

When no high-frequency energy was supplied in Example 1, the purification rate after 30 seconds was about 5%.

(Example 2) As a ceramic porous body 2, a formed body made of alumina and zirconia (volume: 50 cc, 15
cell / inch ² ) and a high frequency absorber 1 using zinc oxide whiskers as a high frequency absorbing material constituting the high frequency absorbing layer 3
Was prepared. Also, alumina as the ceramic support 5,
Using a honeycomb-shaped (cell having a square shape) of silica and magnesia (capacity 100 cc, 400 cells / inch ² ), zirconia as ceramic fine particles constituting the carrier layer 6, platinum as a catalyst 7 for decomposing harmful substances, 4 was produced. Note that alumina sol was used as the inorganic binder. The high-frequency absorber 1 and the catalyst 4 are housed in the heating chamber 10 of the exhaust gas purifying apparatus (high-frequency power consumption 1.5 kW) shown in FIG. 2 so that the high-frequency absorber 1 is on the upstream side of the exhaust gas. Approximately 300 l / min, exhaust gas temperature 300-350
When the engine (displacement: 2000 cc) was operated at a temperature of ° C. and the purification performance of hydrocarbons by a hydrocarbon analyzer was evaluated, a purification rate of about 60% was obtained 30 seconds after high-frequency power supply.

[0031]

When silica or ceria was used instead of zirconia as the ceramic fine particles constituting the carrier layer 6, a purification rate of about 60% was obtained after 30 seconds of high-frequency power supply.

As described above, the high-frequency heating element 8 having the catalytic function of the present invention (the high-frequency absorber 1 and the catalyst 4) is applied to an exhaust gas purification apparatus, and an excellent purification performance is obtained by supplying a high frequency. be able to. This is high frequency absorber 1
Coating ceramic material on organic porous body with skeleton
And a ceramic porous body obtained by firing and firing.
And the skeleton was made from ceramic powder as before
Molded body with honeycomb structure or ceramic fiber
Consisting of a molded body having a honeycomb structure manufactured from
It can reduce the weight compared to the body, by high-frequency energy of the high frequency absorber 1 because the resulting heat capacity is reduced
Rapid heating is possible and the heat energy is
Efficient transmission to the catalyst placed downstream of the flow
This is because the temperature can be raised more quickly to the temperature that functions as a catalyst.

Further, since the catalyst body 4 is disposed downstream of the flow of the exhaust gas from the high frequency absorber 1, adhesion of sulfur and the like contained in the exhaust gas is suppressed, and deterioration of the catalyst due to poisoning is prevented. be able to.

In Embodiment 2 described above, the ceramic support 5 constituting the catalyst body 4 is a honeycomb-shaped (cell having a rectangular shape) of alumina, silica, and magnesia. However, the temperature of the catalyst body 4 is increased more quickly. It is preferable to use a ceramic porous body 2 or a structure made of a porous sheet made of ceramic fibers used in Example 1, which can reduce the weight.

Although the high-frequency absorber 1 and the catalyst 4 are arranged in the same heating chamber 10 in the above embodiment, the present invention is not limited to this configuration. May be arranged.

FIG. 3 is a partial sectional view of a high frequency absorber constituting a high frequency heating element having a catalytic function according to another embodiment of the present invention. The high frequency absorber 16 is made of a porous ceramic body having a function of absorbing high frequency energy and generating heat,
It has a structure similar to that of the porous ceramic body 2 described in FIG. That is, a three-dimensional net-like skeleton having uniform continuous pores obtained by coating an organic porous material such as polyurethane (for example, polyurethane foam) as a base material with silicon carbide particles that absorb high-frequency energy and generate heat and firing. The structure is applied. This structure is charcoal
Due to the sintering of individual particles of silicon carbide
Has a continuous connection.

The difference from the above-described high frequency absorber 1 is that the high frequency absorbing layer 3 is not required since the ceramic porous body itself absorbs high frequency and generates heat.

The high-frequency absorber 16 is used in combination with the catalyst 4 in the same manner as the high-frequency absorber 1 described above.

[0040]

Embodiment 3 As a ceramic porous body that absorbs high-frequency energy and generates heat
Molded body made of silicon carbide (volume 50 cc, 20 cell / inch
2) was prepared to obtain a high-frequency absorber 16. Further, as the ceramic support 5, alumina, silica,
Magnesia compact (volume 100cc, 15cell / inch2)
A catalyst 4 was prepared using alumina as the ceramic fine particles constituting the carrier layer 6 and platinum as the catalyst 7 for decomposing harmful substances. Note that alumina sol was used as the inorganic binder. The high-frequency absorber 16 and the catalyst 4 are housed in the heating chamber 10 of the exhaust gas purification device (high-frequency power consumption 1.5 kW) shown in FIG. 2 so that the high-frequency absorber 16 is on the upstream side of the exhaust gas. The engine (displacement 20
00 cc) was operated to evaluate the purification performance of hydrocarbons by a hydrocarbon analyzer.
% Purification rate was obtained.

As described above, excellent purification performance can be obtained even if a silicon carbide porous body that absorbs high-frequency energy and generates heat is used as the high-frequency absorber 16. Since the heat capacity can be reduced by using a ceramic porous body that absorbs high-frequency energy and generates heat as the high-frequency absorber 16 as in the first and second embodiments, rapid heating becomes possible and the heat is transferred to the catalyst 4. This is because heat can be efficiently transmitted to the catalyst and the temperature can be raised more quickly to the temperature at which the catalyst functions.

FIG. 4 is a partial sectional view of a high frequency absorber constituting a high frequency heating element having a catalytic function according to another embodiment of the present invention. The high-frequency absorber 17 is made of silicon carbide or zinc oxide which absorbs high-frequency energy into the ceramic porous body 2 and generates heat.
A high frequency absorbing layer 3 made of any whisker is formed, and the high frequency absorbing layer 3 is made of platinum, palladium, rhodium or the like.
Any heat-resistant metal fine particles 18 are supported.

The high-frequency absorber 17 is used in combination with the catalyst 4 in the same manner as the high-frequency absorber 1 described above.

(Example 4) As the ceramic porous body 2, a molded body (volume 50) made of alumina, silica, and magnesia was used.
cc, 15 cells / inch ² ), a silicon carbide whisker as a high frequency absorbing material constituting the high frequency absorbing layer 3, and platinum as metal fine particles were used to produce a high frequency absorber 17. The same ceramic porous body (capacity: 100 cc, 15 cells / inch ² ) as the above, alumina as the ceramic fine particles constituting the carrier layer 6, and platinum as the catalyst 7 for decomposing harmful substances were used as the ceramic support 5. Was prepared. Note that alumina sol was used as the inorganic binder. The high-frequency absorber 17 and the catalyst 4 are housed in the heating chamber 10 of the exhaust gas purifying apparatus (high-frequency power consumption 1.5 kW) shown in FIG. 2 so that the high-frequency absorber 17 is on the upstream side of the exhaust gas. Approximately 300 l / min, exhaust gas temperature 300 ~
When the engine (displacement: 2000 cc) was operated at 350 ° C. and the purification performance of hydrocarbons by a hydrocarbon analyzer was evaluated, a purification rate of about 75% was obtained after 30 seconds of high-frequency power supply.

When noble metals such as rhodium and palladium were used as the metal fine particles 18 instead of platinum, the same performance as described above was obtained.

As described above, it has been confirmed that the use of the fine metal particles 18 in the high frequency absorber 17 further improves the performance of purifying hydrocarbons. The reason for this is that since the temperature rise of the high-frequency absorber 17 is made uniform, by supporting the metal fine particles 18 on the high-frequency absorber layer 3, the electrical characteristics of the high-frequency absorber 17, such as the conductive characteristics and the dielectric characteristics, become higher. It is conceivable that the improvement has been made in the direction of improving the energy absorption, and further, since the fine metal particles 18 such as platinum have a catalytic function, a catalytic reaction may also occur in the high frequency absorber 17.

The fine metal particles 18 can also be applied to the high-frequency absorber 16 made of a porous silicon carbide material that absorbs high-frequency energy and generates heat, applied in the third embodiment.

The high-frequency heating element 8 having a catalytic function of the present invention can also be used as a means for decomposing oily smoke and odor discharged from a cooker such as an oven microwave oven.

[0050]

As described above, according to the high-frequency heating element having a catalytic function of the present invention, the following effects can be obtained.

(1) The high-frequency absorber has an organic skeleton
It is obtained by coating and firing a porous material with a ceramic material.
High frequency to ceramic porous material or organic porous material
Coating and firing silicon carbide, which absorbs energy and generates heat
It is made of porous material obtained by
The honeycomb structure whose skeleton was made from ceramic powder
Having a molded body or ceramic fiber
Weight compared to a structure consisting of a molded body with a honeycomb structure
Lighter, resulting in lower heat capacity and higher frequency energy
To raise the high-frequency absorber at a higher temperature more quickly.
Can be. And the heat is applied to the flow of exhaust gas
Since the heat is transmitted to the catalyst body disposed on the flow side, the temperature can be raised to a temperature that functions as a catalyst in a short time, and excellent exhaust gas purification performance can be obtained.

(2) By supporting the metal fine particles on the high-frequency absorber, it is possible to improve the temperature rising characteristics of the high-frequency absorber and exhibit a catalytic function, so that the purification performance of exhaust gas can be further improved. it can.

(3) Since the high-frequency heating element having a catalytic function can be heated to a temperature that functions as a catalyst in a very short time, it can be disposed at a position distant from the engine. Even in a situation where the temperature of the exhaust gas is high immediately below, a high-temperature environment can be avoided, so that deterioration of the high-frequency absorber and the catalyst body is significantly suppressed, and excellent durability can be realized.

(4) Since the catalyst is disposed downstream of the flow of the exhaust gas from the high frequency absorber, adhesion of sulfur and the like contained in the exhaust gas is suppressed, and deterioration of the catalyst due to poisoning is prevented. Therefore, the life of the catalyst can be improved.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a high-frequency heating element according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an exhaust gas purifying apparatus using the high-frequency heating element.

FIG. 3 is a partial cross-sectional view of a high-frequency absorber according to another embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of the high-frequency absorber.

[Explanation of symbols]

 Reference Signs List 1, 16, 17 High frequency absorber 2 Ceramic porous body 3 High frequency absorption layer 4 Catalyst 5 Ceramic support 6 Carrier layer 7 Catalyst 8 High frequency heating element having catalytic function 18 Metal fine particles

Claims (4)

(57) [Claims] A ceramic material is coated on an organic porous material.
A high-frequency absorber formed of at least one whisker of silicon carbide and zinc oxide that absorbs high-frequency energy and generates heat in a porous ceramic obtained by heating and firing ; and ceramic fine particles on a ceramic support. A high-frequency heating element having a catalytic function, comprising: a catalyst layer having a carrier layer formed of a catalyst and a catalyst supported on the carrier layer. 2. The high-frequency heating element having a catalytic function according to claim 1, wherein the high-frequency absorbing layer that absorbs high-frequency energy and generates heat carries at least one kind of fine metal particles made of platinum, palladium, and rhodium. 3. A high-frequency absorber obtained by coating and firing silicon carbide, which absorbs high-frequency energy and generates heat, on an organic porous body, and a carrier layer comprising ceramic fine particles is formed on a ceramic support. A high-frequency heating element having a catalytic function, comprising: a catalyst having a catalyst supported on the carrier layer. 4. A high-frequency heating element having a catalytic function according to claim 3, wherein the high-frequency absorbing element that absorbs high-frequency energy and generates heat carries at least one kind of metal fine particles made of platinum, palladium, and rhodium.