JP5483077B2 - Air cleaning apparatus and air cleaning method - Google Patents

Description

  The present invention relates to an air cleaning device and an air cleaning method for chemically decomposing pollutants in air with a catalyst material.

It is known that ethylene is generated from fruits and vegetables in the storage and long-distance transportation of fruits and vegetables. This ethylene acts as a food hormone that promotes the ripening of fruits and vegetables and fruits, and if the ripening is promoted, it will rot. For this reason, removing the generated ethylene quickly is effective for long-term preservation of fruits and vegetables. In particular, in container ship transportation, aircraft transportation, and truck transportation from a distance, rapid removal and decomposition of ethylene is important in order to maintain freshness.
Techniques for quickly cleaning air contaminated with various pollutants such as ethylene are demanded in various fields.

  As one of such techniques, a technique using a photocatalyst (see Patent Document 1) has been proposed. However, the photocatalyst has a problem that the decomposition rate is slow, the decomposition of pollutants is not complete, a harmful intermediate decomposition product is generated, and the decomposition product deteriorates the performance of the photocatalyst.

  As another technique, a method of decomposing with ozone has been proposed (see Patent Document 2). However, ozone has problems such as being harmful in itself and concern about the influence of substances after decomposition on the human body. Furthermore, since ozone has a bleaching action, for example, when ethylene generated from fruits and fruits as described above is to be decomposed, there is a problem that the color of fruits and fruits changes and the commercial value decreases.

  Yet another technique is decomposition by a catalyst, but a high temperature is necessary for the catalyst to function. For example, since the storage and transportation of fruits and vegetables and fruits are often performed in a frozen or refrigerated state, an increase in air temperature associated with air purification leads to an increase in energy costs required for freezing and refrigeration. For air purification in such an environment, a method that can be performed at a lower temperature is desired.

  Patent Document 3 proposes an air purifier using microwaves, but this technique also heats unnecessary portions other than the catalyst, and thus has a problem in terms of suppressing an increase in air temperature. In addition, microwave irradiation is likely to cause uneven heating. In the air cleaner described in Patent Document 3, the heating element is rotated by a motor in order to suppress this unevenness.

JP 2006-158313 A JP 2005-261428 A JP 2006-158947 A

As described above, when performing air cleaning, first, the decomposition rate must be fast, low-concentration pollutants can be decomposed, no harmful substances should be used, and no decomposition products or intermediate substances should be harmful. It is required that the performance does not deteriorate.
An object of the present invention is to provide an air cleaning device and an air cleaning method that satisfy these requirements and further reduce an increase in air temperature.

The above object has been achieved by the following invention.
(1) An air cleaning apparatus for chemically decomposing pollutants in the air, which generates heat by electromagnetic waves generating means for generating electromagnetic waves that promote the chemical reaction and a support that transmits contaminated air. Having a catalytic material with a particle size of 1 μm or less,
The electromagnetic wave is a microwave having a wavelength of 0.8 to 28 GHz,
The support is an absorbs less support of the electromagnetic waves, that said catalytic material is supported on the inside or on the surface of the thin film having a thickness 10nm~1mm by easily absorbing material the electromagnetic wave from the support An air purifier characterized by.
(2) The catalyst material is at least one selected from the group consisting of palladium, platinum, nickel, copper, vanadium, ruthenium, titanium, tungsten, gold, silver, and oxides thereof ( The air purifier according to 1).
(3) The support is porous glass, alumina, silica, zeolite, quartz, polyetheretherketone resin, fluororesin, Teflon (registered trademark) or a composite thereof (1) or The air purifier according to (2).
(4) The thin film material carrying the catalyst material is oxide particles, metal particles having a particle diameter of 1 μm or less, or SiC, wherein any one of (1) to (3) Air purification equipment.
(5) The air according to any one of (1) to (3), wherein the material of the thin film supporting the catalyst material is oxide particles or metal particles having a particle diameter of 1 μm or less. Cleaning device.
(6) The support is a hollow cylindrical support, and the thin film carrying the catalyst substance is formed on the outer surface or the inner surface of the support (1) to ( The air purifier according to any one of 5).
(7) Contaminated air is supplied from the inside of the cylindrical support, and clean air in which contaminants are decomposed by contact with the thin film on which the catalyst material is supported is transmitted to the outside of the support. The air purifier according to (6).
(8) Contaminated air is supplied from the outside of the cylindrical support, and clean air in which the contaminant is decomposed by contact with the thin film carrying the catalyst material is transmitted to the inside of the support. The air purifier according to (6).
(9) The air cleaning device according to any one of (1) to (8), wherein the electromagnetic wave irradiation means can concentrate and irradiate electromagnetic waves on the surface of the catalyst material.
(10) The electromagnetic wave irradiation means has an electromagnetic wave irradiation space capable of forming a standing wave in a single mode, and the catalytic substance is disposed in a portion where an electric field or a magnetic field is concentrated. The air purifier according to (9).
(11) The electromagnetic wave irradiation space has a hollow cylindrical structure, and a TM _mn0 mode standing wave (m is an integer of 0 or more and n is an integer of 1 or more) can be formed therein, and an electric field or a magnetic field is concentrated. The air purifier according to (10), wherein a hollow cylindrical support body in which the thin film of the catalyst material is formed on an outer surface or an inner surface of the thin film is disposed in a portion to be formed.
(12) the _{contaminants, C x1 H y1, C x2} H y2 O z2, C x3 H y3 O z3 M and _{C x4 H y4 M (x1,} y1, x2, y2, z2, x3, y3, z3, x4 and y4 each represents an integer of 1 or more, and M represents at least one organic compound selected from the group consisting of N, S, Cl and F) (1 The air purifier according to any one of (11) to (11).
(13) An air cleaning method in which contaminants in the air are chemically decomposed by a catalyst substance that generates heat by irradiating electromagnetic waves, and the catalyst substance having a particle size of 1 μm or less is present on a support that is permeable to contaminated air. and, said electromagnetic wave, a microwave wavelength 0.8～28GHz, the support is a absorbs less support of the electromagnetic wave, the catalyst material to absorb the electromagnetic wave from the support An air cleaning method characterized by being supported on the surface or inside of a thin film having a thickness of 10 nm to 1 mm made of an easy substance.
(14) The support is porous glass, alumina, silica, zeolite, quartz, polyetheretherketone resin, fluororesin, Teflon (registered trademark) or a composite thereof, and a thin film carrying the catalyst substance The air cleaning method according to (13), wherein the substance is oxide particles, metal particles having a particle diameter of 1 μm or less, or SiC.
(15) The contaminants are C _x1 H _y1 , C _x2 H _y2 O _z2 , C _x3 H _y3 O _z3 M and C _x4 H _y4 M (x1, y1, x2, y2, z2, x3, y3, z3, x4 and y4 each represents an integer of 1 or more, and M represents at least one organic compound selected from the group consisting of N, S, Cl and F) (13 ) Or (14).

  In the present invention, since air pollutants are oxidatively decomposed with a catalyst, the decomposition rate is high and no harmful product substances are generated. Furthermore, since the catalyst portion is selectively heated by electromagnetic wave irradiation, the temperature rise of the air can be reduced and cleaning can be performed.

It is explanatory drawing which showed typically one Embodiment of the apparatus of invention with sectional drawing. As an Example and a comparative example, it is a graph which shows the conversion rate of ethylene (5ppm, total flow rate 50ml / min) with respect to temperature at the time of heating with a microwave and a heater. It is a graph which shows the temperature which becomes 50% of conversion with respect to each total flow rate when ethylene 5ppm is made into the total flow rate 50-1000 ml / min. It is a graph which shows the temperature which decomposes | disassembles ethylene with the catalyst prepared with the palladium solution of each concentration, and a conversion rate becomes 50%. It is explanatory drawing which shows electric field strength distribution in a cylindrical cavity resonator.

  The air cleaning device of the present invention has an electromagnetic wave irradiation means and a catalyst substance that generates heat by electromagnetic waves.

Heating methods other than electromagnetic waves include those using an external heat source, using a resistance heating element, and using an infrared heater. The heating by electromagnetic wave irradiation performed in the present invention has the following advantages.
First, since the catalyst substance itself absorbs electromagnetic waves and generates heat, the time required for heat generation is short, and the start-up time of the air cleaning device can be shortened. Moreover, since heat generation of the support, the member holding the support, and the piping member is suppressed, energy efficiency is good. Furthermore, since there is little heat_generation | fever other than a catalyst substance, the temperature rise of air can be suppressed. Another advantage is that the heat-resistant design of the air cleaning device is facilitated because the high temperature part can be reduced.

  Another advantage of electromagnetic wave irradiation is a reduction in reaction temperature. Many chemical reactions that can lower the reaction temperature by electromagnetic wave irradiation have been reported, and this effect can also be obtained in the air cleaning apparatus of the present invention. Lowering the reaction temperature not only suppresses the temperature rise of the air, but also has an energy saving effect because it requires less electromagnetic energy. Furthermore, there is an effect that the heat resistance design of the air purifier becomes easy.

A further advantage of electromagnetic wave irradiation is that it promotes the adsorption of chemical substances. Satoru Kobayashi, Junko Kin, Chihiro Kemizaki, Atsushi Kushiyama, Koichi Mizuno, “Control of adsorption by Microwave Irradiation”. Chemistry Letters 1996, Vol. 8, No. 8, pp. 769-770. The effect of promoting and suppressing the adsorption and desorption of these substances on the surface of solid substances has been reported. In this document, it is described that the adsorption of the organic substance existing in the air is promoted instead of the desorption of moisture adsorbed on the surface by the irradiation of the electromagnetic wave to the zeolite. Yes. In the catalytic reaction, the target substance is adsorbed on the surface of the catalyst, and the decomposition product is promptly desorbed from the catalyst. In the decomposition of an organic substance in the air, the adsorption of the organic substance to the catalyst is promoted by electromagnetic wave irradiation, and water (H ₂ O) and carbon dioxide (CO ₂ ), which are the main components of the decomposition product decomposed on the catalyst. ) Can facilitate the decomposing of pollutants.
As described above, heating of the catalyst material by electromagnetic waves has many advantages compared to other heating techniques.

The electromagnetic wave irradiation means in the air cleaning device of the present invention may be anything that can cause the catalyst material to generate heat, and the members other than the catalyst material generate little heat.
The electromagnetic wave irradiation means is preferably one that can irradiate electromagnetic waves concentrated on the surface of the catalyst material.
For example, as one of electromagnetic wave irradiation spaces having a structure capable of concentrating an electric field, there is a method of using a container that can stably form a specific standing wave using a space called a cavity resonator. FIG. 5 shows an example of the electric field strength distribution in the cylindrical cavity resonator. In the figure, 11 is a cavity resonator, 12 is a microwave irradiation port, and the lower graph shows the electric field strength in the radial direction of the cavity resonator 11 (the horizontal axis corresponds to the radius of the cavity resonator 11). . By disposing a support body supporting the catalyst material at a portion of the cavity resonator 11 corresponding to the position where the electric field is strong in the graph, the catalyst material can be selectively heated. Although described with reference to the electric field in FIG. 5, since the electromagnetic wave also has a heating action by the magnetic field, the same effect can be obtained even if a portion where the magnetic field becomes strong is used.

  As another electric field concentration method, there is a method using a mirror that reflects electromagnetic waves. A method using an elliptical electromagnetic wave reflection space as described in JP-A Nos. 2006-173069 and 2006-286588 can be used. If electromagnetic waves are supplied from one focal point of the ellipse, the electromagnetic waves can be concentrated on the other focal point. A similar effect can be obtained by arranging a support carrying a catalyst substance at the focal portion.

In the present invention, the electromagnetic wave irradiation means preferably has an electromagnetic wave irradiation space capable of forming a standing wave in a single mode. It is more preferable that the electromagnetic wave irradiation space is a hollow cylindrical type. As will be described later, an electric field or a magnetic field is generated by coaxially arranging a hollow cylindrical support carrying a catalytic substance in the space. It can be concentrated on the catalytic material. The electromagnetic wave irradiation means in the present invention is in the M _mn0 mode (m is an integer of 0 or more, n is an integer of 1 or more, preferably m = 0, n = 1) in the cylindrical electromagnetic wave irradiation space. Those capable of forming waves are particularly preferred.
It is preferable that the irradiation amount of the electromagnetic wave is automatically adjusted according to the temperature of the catalyst substance. The temperature of the catalyst material varies depending on the type of catalyst and the contaminant to be decomposed, but for example, when ethylene is decomposed, 50 to 300 ° C. is preferable. Wavelength 0.8～28GHz is rather preferable in the present invention, as an electromagnetic wave, using a microwave of wavelength 0.8～28GHz.
In the apparatus of the present invention, it is preferable to control the heating by detecting the temperature of the catalyst substance and adjusting the output of the electromagnetic wave irradiation means based on this.

  The catalytic substance included in the air cleaning device of the present invention generates heat when irradiated with electromagnetic waves by the electromagnetic wave irradiation means, and exhibits activity in decomposing pollutants in the air. Examples thereof include palladium, platinum, nickel, vanadium, copper, ruthenium, tungsten, titanium, gold, silver, oxides thereof, and composites thereof, but are not limited thereto. Preferably, at least one selected from the group consisting of palladium, platinum, nickel, vanadium, copper, gold, silver, oxides thereof, and titanium oxide is used.

The catalyst material is preferably one that can absorb electromagnetic waves. The use of catalyst material as fine particles is one of the most suitable methods for this purpose. The particle size of the fine particles varies depending on the type of catalytic material, in the present invention has at 1μm or less, good Mashiku is 5 to 200 nm. By using such fine particles, the catalyst substance itself absorbs electromagnetic waves and generates heat, so that the catalyst substance can be brought to a necessary temperature without separately providing a heating element or the like. If the electromagnetic wave of the catalytic substance is not sufficiently absorbed, a catalyst layer mixed with a substance that absorbs a large amount of electromagnetic wave may be formed, or the catalytic substance may be supported on the surface or inside of a thin film that easily absorbs electromagnetic waves. and rather it may also, in the present invention, the catalytic material is supported on the inside or the surface of the thin film of the electromagnetic wave absorbing material susceptible than support.
Specific structures using catalytic materials as the members of the apparatus of the present invention, a sheet-like or, that or is supported on a support described below elevation Gerare, support on as described above in the present invention Is supported on a thin film .

When using a support body, it is preferable that it is a porous material which permeate | transmits gas (air). Moreover, it is preferable that there is little absorption of electromagnetic waves.
Specific examples include, but are not limited to, porous glass, alumina, silica, zeolite, quartz, polyetheretherketone resin, fluororesin, Teflon (registered trademark) or a composite thereof. It is not a thing.

Catalytic material only in the surface layer of the support, Ru was supported to form a thin film. The thickness direction of the thin film and the direction in which air permeates the support are set to the same direction. By doing in this way, the time which contaminated air contacts with the heat-generated catalyst substance layer can be shortened, and the temperature rise of air can be suppressed. A thin film of catalytic material may be formed only on the catalytic material, but in the present invention, you also produced, such as by supporting the catalyst material on the surface of or inside of the thin film of absorbent material susceptible to electromagnetic waves as described above . The absorbing material susceptible to electromagnetic waves, oxide particles, metal particles having a particle diameter 1 [mu] m, such as SiC can be mentioned up. The thickness of the thin film is 10nm~1mm, 10nm~50μm virtuous preferable.

In the present invention, it is more preferable that the support has a hollow cylindrical shape and has a thin film of a catalytic substance on the outer surface or the inner surface thereof.
Contaminated air is supplied to the inside of the cylindrical support, and is brought into contact with a thin film of the catalyst material to decompose the pollutant, so that the purified air permeates outside the support. It is preferable. Or conversely, the configuration may be such that contaminated air is supplied to the outside of the cylindrical support, brought into contact with the catalyst substance to decompose the pollutant, and the clean air permeates into the support to be collected.
The catalytic material heated by electromagnetic waves activates the decomposition reaction of pollutants in the air by the action of heat and electromagnetic waves. The pollutants in the air are decomposed by contacting the catalyst while passing through the thin film catalyst material layer, are converted into harmless substances, and the air is cleaned.
As described above, the cylindrical support carrying the catalyst substance is used together with the electromagnetic wave irradiation means having the cylindrical electromagnetic wave irradiation space, and is arranged coaxially in the electromagnetic wave irradiation space to concentrate the electric field or the magnetic field, It is preferable to exotherm the catalyst material.
In the apparatus of the present invention, the catalytic substance is heated uniformly without rotating the member to be heated, and the pollutant can be sufficiently decomposed.

The contaminants that can be decomposed in the present _{invention, C x1 H y1, C x2} H y2 O z2, C x3 H y3 O z3 M and _{C x4 H y4 M (x1,} y1, x2, y2, z2, x3, y3, z3, x4, and y4 each represents an integer of 1 or more, and M represents at least one selected from the group consisting of N, S, Cl, and F, and may be a compound containing a plurality of types. Ethylene and formaldehyde are preferred, and ethylene is particularly preferred.

Next, the present invention will be described in more detail with reference to the drawings.
FIG. 1 is an explanatory view schematically showing a cross-sectional view of an embodiment of the apparatus of the present invention. The air cleaning device 1 has a microwave cavity 2 as electromagnetic wave irradiation means, and can irradiate microwaves from the upper part of the device 1. A hollow cylindrical support 3 on which a catalyst material thin film 4 is formed is disposed in the center of the inside of the microwave cavity 2. This apparatus 1 is of an electrolytic concentration type, and can selectively heat the catalyst material thin film 4 carried by the support 3 placed in the quartz tube 5.
The contaminated air is introduced from the outside of the microwave cavity 2 into the cylindrical support 3 and contacts with the catalyst material thin film 4 when passing through the support 3 to decompose the contaminant. As a result, the contaminated air and the purified air are separated, and only the cleaned air can be taken out of the apparatus.

Hereinafter, the present invention will be described in more detail based on examples.
In the following description, “%” means “mol%” unless otherwise specified.

Ethylene in the contaminated air was decomposed using the air purifier shown in FIG.
As the electromagnetic wave irradiating means, using the cylindrical cavity resonator, so that it can form a standing wave of TM _010, to adjust the size of the cavity resonator. At this time, the central axis of the cylinder has the strongest electric field.
A cylindrical porous support 3 having an outer diameter of 10 mm and an inner diameter of 6 mm was installed along this central axis. The material of the porous support 3 is α-alumina, and the absorption of electromagnetic waves is small. Porous γ-alumina was applied to the outer surface of this porous support so as to have a thickness of 5 μm, and palladium fine particles having a particle diameter of about 0.01 μm were supported inside the γ-alumina layer to form a catalyst material thin film 4. . For supporting palladium, the support was immersed in a palladium acetate solution, dried, heated and fired at 550 ° C. in an air atmosphere, and then reduced in a hydrogen stream. At this time, the particle diameter of palladium was about 10 nm by TEM observation.
This microwave heating apparatus is of an electrolytic concentration type, and can selectively heat a palladium catalyst placed in a quartz tube. Ethylene flows from the inside of the catalyst thin film and permeates the outside. As it permeates, ethylene is decomposed by the heated palladium.

The palladium catalyst is a thin film of palladium supported on a porous α-alumina tube as a support. In order to support palladium, the porous alumina tube was immersed in a palladium solution (Pd (CH ₃ COO) ₂ solute, CCl ₄ solvent), and then reduced at 550 ° C. for 1 hour in a hydrogen atmosphere.

  Ethylene standard gas was used as contaminated air. A simulated pollutant gas diluted with nitrogen gas so that the ethylene concentration becomes 5 ppm and 50 ppm and the oxygen concentration becomes 20% is supplied from the inside of the support, and the gas discharged to the outside is Fourier transformed. Analysis was performed by infrared spectroscopy (FTIR) and gas chromatography.

  When an electromagnetic wave of 2.45 GHz is supplied to the cavity resonator, only the palladium catalyst layer is heated. The catalyst surface temperature at this time was measured with a radiation thermometer. The temperature of the gas that has passed through the catalyst layer is measured with a thermocouple. The temperature of the catalyst layer surface is controlled by adjusting the intensity of the electromagnetic wave.

  For comparison, an experiment was also conducted in the case where a ribbon heater was wound around the outside instead of electromagnetic wave irradiation, and heating was performed by heat conduction by an external heat supply.

  We examined whether or not the promotion of ethylene decomposition by microwaves was observed. FIG. 2 is a graph showing the conversion rate of ethylene (5 ppm, total flow rate 50 ml / min) with respect to temperature when heated by a microwave and a heater. From FIG. 2, it was found that the conversion rate increased with microwave heating rather than with heater heating. This seems to have been promoted chemical reaction by microwave. It was also found that ethylene at 5 ppm (total flow rate 50 ml / min) could be completely decomposed at 230 ° C. Only carbon dioxide was produced by decomposing ethylene. Thereby, it turned out that the product of the ethylene decomposition | disassembly using a microwave is harmless.

  As an air cleaning device, it is desired that ethylene can be decomposed even at a large flow rate. Therefore, the change in the conversion rate was examined by setting 5 ppm of ethylene to a total flow rate of 50 to 1000 ml / min. The temperature at which the conversion rate is 50% for each total flow rate is shown in FIG. In heater heating, the temperature at which the conversion rate becomes 50% increases as the total flow rate increases. On the other hand, in microwave heating, even when the total flow rate was changed, the temperature at which the conversion was 50% changed only to 150 to 170 ° C.

In order to decompose more ethylene, it is required to increase the amount of catalyst supported on the support. Therefore, ethylene decomposition was carried out with a palladium catalyst prepared as shown in Table 1 with palladium solution concentrations of 0.1%, 0.2% and 1.0%.
FIG. 4 shows the temperatures at which ethylene is decomposed with catalysts prepared with palladium solutions of various concentrations and the conversion is 50%. FIG. 4 shows that the temperature at which the conversion rate becomes 50% can be lowered by increasing the palladium solution concentration.

DESCRIPTION OF SYMBOLS 1 Air cleaning apparatus 2 Microwave cavity 3 Cylindrical support body 4 Catalyst material thin film 5 Quartz tube 11 Cavity resonator 12 Microwave irradiation port

Claims (15)

An air cleaning apparatus for chemically decomposing pollutants in the air, an electromagnetic wave generating means for generating an electromagnetic wave that promotes the chemical reaction, and a particle size of 1 μm that generates heat by the electromagnetic wave on a support that transmits the contaminated air. Having the following catalytic materials:
The electromagnetic wave is a microwave having a wavelength of 0.8 to 28 GHz,
The support is an absorbs less support of the electromagnetic waves, that said catalytic material is supported on the inside or on the surface of the thin film having a thickness 10nm~1mm by easily absorbing material the electromagnetic wave from the support An air purifier characterized by.   The catalyst material is at least one selected from the group consisting of palladium, platinum, nickel, copper, vanadium, ruthenium, titanium, tungsten, gold, silver, and oxides thereof. The air cleaning apparatus as described.   3. The support according to claim 1, wherein the support is porous glass, alumina, silica, zeolite, quartz, polyetheretherketone resin, fluororesin, Teflon (registered trademark) or a composite thereof. Air purification equipment.   The air cleaning apparatus according to any one of claims 1 to 3, wherein the thin film material carrying the catalyst material is oxide particles, metal particles having a particle diameter of 1 µm or less, or SiC.   The air cleaning apparatus according to any one of claims 1 to 3, wherein the material of the thin film supporting the catalyst material is oxide particles or metal particles having a particle diameter of 1 µm or less.   6. The support according to claim 1, wherein the support is a hollow cylindrical support, and the thin film carrying the catalyst substance is formed on an outer surface or an inner surface of the support. The air purifier according to claim 1.   The contaminated air is supplied from the inside of the cylindrical support, and clean air in which the contaminants are decomposed by contacting with the thin film on which the catalyst material is supported is transmitted to the outside of the support. Item 7. The air cleaning device according to Item 6.   The contaminated air is supplied from the outside of the cylindrical support, and the clean air in which the contaminant is decomposed by contacting with the thin film on which the catalyst material is supported permeates the inside of the support. Item 7. The air cleaning device according to Item 6.   The air cleaner according to any one of claims 1 to 8, wherein the electromagnetic wave irradiation means can irradiate the electromagnetic wave in a concentrated manner on the surface of the catalyst material.   The electromagnetic wave irradiation means has an electromagnetic wave irradiation space capable of forming a standing wave in a single mode, and the catalytic substance is disposed in a portion where an electric field or a magnetic field is concentrated. The air purifier according to claim 9. The electromagnetic wave irradiation space has a hollow cylindrical structure, and a TM _mn0 mode standing wave (m is an integer greater than or equal to 0 and n is an integer greater than or equal to 1) can be formed inside the area where the electric field or magnetic field is concentrated. 11. The air cleaning apparatus according to claim 10, wherein the catalyst material thin film has a structure in which a hollow cylindrical support is formed on an outer surface or an inner surface thereof. The _{contaminants, C x1 H y1, C x2} H y2 O z2, C x3 H y3 O z3 M and _{C x4 H y4 M (x1,} y1, x2, y2, z2, x3, y3, z3, x4, y4 12 represents an integer of 1 or more, and M represents at least one organic compound selected from the group consisting of N, S, Cl and F). The air purifier of any one of these. The contaminants in the air, a chemical decomposing air cleaning method by heating the catalyst material by electromagnetic radiation, on a support that transmits contaminated air has less of the catalyst material particle size 1 [mu] m, the electromagnetic waves, a microwave wavelength 0.8～28GHz, the support is a absorbs less support of the electromagnetic wave, the catalyst material, due to absorption material susceptible to the electromagnetic waves from the support An air cleaning method which is carried on the surface or inside of a thin film having a thickness of 10 nm to 1 mm.   The support is porous glass, alumina, silica, zeolite, quartz, polyetheretherketone resin, fluororesin, Teflon (registered trademark) or a composite thereof, and the thin film material supporting the catalyst material is: The air cleaning method according to claim 13, which is oxide particles, metal particles having a particle diameter of 1 μm or less, or SiC. The _{contaminants, C x1 H y1, C x2} H y2 O z2, C x3 H y3 O z3 M and _{C x4 H y4 M (x1,} y1, x2, y2, z2, x3, y3, z3, x4, y4 Each represents an integer of 1 or more, and M is at least one organic compound selected from the group consisting of N, S, Cl and F). The air cleaning method as described in 2.

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