JP3206107B2 - Air purifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifying agent particularly useful for removing harmful substances and odors.

[0002]

2. Description of the Related Art Harmful substances such as nitrogen oxides and sulfur oxides have an adverse effect on the human body and are important factors in environmental destruction such as acid rain. In addition to these harmful substances, in terms of air purification, measures to remove various odors represented by gases specified by the Odor Control Law are urgently required.

Conventional methods for removing nitrogen oxides and sulfur oxides include a wet cleaning method using a water / alkali solution or an oxidizing agent and an alkali solution, a catalytic reduction method using various combustible gases, and a catalyst. For example, a catalytic cracking method using thiol has been proposed. For the removal of offensive odors, a method using an adsorbent such as activated carbon as a deodorant, a method using a catalyst, a method using a chemical reaction, and the like have been proposed.

[0004]

As described above, in the prior art, the removal of harmful substances such as nitrogen oxides and sulfur oxides,
Odor elimination is carried out by different methods.The odor elimination method cannot remove harmful substances sufficiently, and the harmful substance elimination method cannot remove odors enough. It required a means.

In the prior art, the removal of nitrogen oxides, particularly nitric oxide, is often not in practical use in terms of characteristics, and requires extensive treatment such as wastewater treatment, exhaust gas treatment, and high temperatures. There are many problems in practical use, such as the need for equipment. Therefore, the present invention simultaneously removes harmful substances such as nitrogen oxides and sulfur oxides and malodorous substances,
Moreover, it is an object of the present invention to provide a removing means which can be realized both in terms of characteristics and economy.

[0006]

According to the present invention, a phenol resin having a molecular weight of 3000 or more is used as a raw material, and the specific surface area is from 1,000 m ² / g to 2500.
m ² / g of activated carbon by homogeneous precipitation
An air purification agent carrying an iron compound.

[0007]

According to the above-mentioned means, activated carbon carrying an iron compound has a large number of micropores, and these micropores adsorb harmful substances such as nitrogen oxides and sulfur oxides and many substances that emit a bad smell. It is to be removed. In other words, it acts to remove both harmful substances and odors by one means.

[0008]

An embodiment of the present invention will be described below with reference to FIG. Reference numeral 1 denotes a remover body, which is an air cleaner in this embodiment. Reference numeral 2 denotes an adsorption layer containing activated carbon supporting an iron compound, and reference numeral 3 denotes a fan for forcibly passing air through the adsorption layer 2. Arrows in the figure indicate the flow of air.

First, the activated carbon used in this embodiment will be described in detail. As a raw material, a self-curing phenol resin, in which primary and secondary particles are spherical (particle diameter: 0.1 to 150
μm) of resin (Belle Pearl manufactured by Kanebo Co., Ltd.). Since this resin has a molecular weight of 3,000 or more, a long molecular chain and a short side chain, it is tenacious and has self-curing properties. This resin powder is tumbled, granulated, formed into a spherical shape, carbonized, and subsequently activated at about 900 ° C. with steam.
The activated carbon thus produced has a particle size of 1.0 to 1.0.
It is 2.0 mm, and some irregular shaped articles such as flat ones are observed.

FIG. 2 is a partially enlarged view of the activated carbon. 4 is a primary particle. When the spherically shaped product is heated, it is first softened and the adjacent particles adhere to each other and then hardened, and the spherical particles are sintered. As a result, continuous voids 5 of several μm to 10 μm are formed between the spherical primary particles 4. The water vapor at the time of activation spreads to every corner of the primary particles 4 through the continuous voids 5. For this reason, many micropores having a radius of about 10 angstroms are formed, and the activated carbon has a large specific surface area.

In this embodiment, a phenol resin having a molecular weight of 3,000 or more is used as a raw material. However, if the molecular weight is smaller than this, self-curing property is lost and it is necessary to mix and cure a curing agent such as hexamethylenetetramine. There is. In this case, when activated carbon is obtained by carbonizing and activating the activated carbon, the resin has a short and weak molecular chain. Further, since the curing agent causes cracks or the like during curing or firing, it becomes extremely brittle activated carbon. Also,
Since the curing agent remains as an impurity, it may be a cause of impairing the adsorption performance and the like.

[0012] On the other hand, coconut shell activated carbon is obtained by pulverizing and crushing the coconut shell as a raw material. When activated by steam, the activated carbon has a branched shape in which the entrance is a hole of several μm, and the hole becomes narrower as it goes deeper. Form pores. However, as compared with the activated carbon of the phenol resin raw material used in the present example, the ratio of fine pores is small, the uniformity of pore distribution is small, and the specific surface area is slightly small.

3 and 4 show measurement data of the pore distribution (a) and the cumulative pore volume (b) of activated carbon using the self-curing phenol resin as a raw material. FIG. 5 shows measurement data of the pore distribution (a) and the cumulative pore volume (b) of the coconut shell activated carbon. These measurements are based on the H ₂ O adsorption method. On the other hand, according to the specific surface area measurement data by the BET method, the one in FIG. 3 is 1300 m ² / g,
Those of 1600 m ² / g, 1300 m those of FIG. 5 ² /
g. From these, when comparing the phenolic resin type and the coconut shell type with the same specific surface area, when the phenolic resin type has a smaller peak radius value of the pore radius distribution and the same peak radius value of the pore radius distribution, The surface area of the phenolic resin is larger.

The micropores of the activated carbon supporting the iron compound are as follows:
The carried iron compound adsorbs nitrogen oxides, sulfur oxides, malodorous substances and the like existing in the vicinity, and has a filling action of filling the adsorbed substance into the micropores. For the filling action, a material having a small pore radius and a uniform structure and a large specific surface area, such as activated carbon fiber, effectively acts. For this reason, in the present embodiment, the above-mentioned phenol resin having a molecular weight of 3000 or more is used as a raw material, and activated carbon having a specific surface area of 1500 m ² / g or more is used. If the specific surface area is larger than about 2500 m2 / g, the activated carbon becomes brittle, becomes powdery, and cannot be present as granular activated carbon. That is, when used as an air freshener, a large amount of fine powder is generated, which is inappropriate. For the above reasons, in this embodiment, the specific surface area is 1500 m ² /
g of activated carbon of 2000 m ² / g or less. Hereinafter, the phenolic resin-based activated carbon used in this example is collectively referred to as BP coal.

Next, a method of preparing activated carbon for supporting an iron compound will be described with reference to the flowchart of FIG.
First, as a pretreatment of activated carbon, BP carbon made from the above-mentioned phenol resin is maintained at a temperature of 110 ° C. and a degree of vacuum of 10-5 torr,
Leave for one hour. By this pretreatment of high temperature suction,
The water contained in the activated carbon is removed, and there is no one that blocks the pores of the activated carbon. Therefore, the iron compound can be supported around the entrance of the micropore.

Here, in order to improve the removal characteristics as described above, a high temperature suction pretreatment is performed, but even if this treatment is omitted, the micropores have a filling action. Ferric chloride is used as the iron salt to be added. The ferric chloride is dissolved in pure water to prepare a 0.2 mol / liter solution.

The activated carbon after the pretreatment is left to stand for 30 minutes, the temperature is lowered to room temperature, and the above prepared ferric chloride solution is added while maintaining the degree of vacuum. This addition was carried out in an amount of 0.2 mol prepared per 25 g of the activated carbon.
Per liter of ferric chloride solution at a rate of 500 ml. When the addition is completed, the mixture is allowed to stand at room temperature for 30 minutes while maintaining the degree of vacuum. After a predetermined time has elapsed, urea four times the weight of ferric chloride is added, and the mixture is stirred and dissolved. At this time, the degree of vacuum is broken. In this state, the mixture is heated at a rate of 1 ° C. per minute, and then left at 98 ° C. for 4 hours to ripen the iron compound. By this treatment, urea is hydrolyzed to produce ammonium ions, and as a result, precipitation of iron hydroxide occurs, and the activated carbon carries the iron compound. This method uses uniform precipitation.
This is called the sedimentation method.
Fine and fine sediment is obtained with little contamination
Things.

After the predetermined time has elapsed, the activated carbon is washed with ion-exchanged water to remove excess precipitate. 1 liter of this ion-exchanged water is used for 25 g of activated carbon. When the washing is completed, the activated carbon is passed through a sieve and left in a dryer at 110 ° C. for 3 hours or more to remove moisture and dry.

With the above processing, the operation of supporting the iron compound is completed. Hereinafter, the processing by the uniform method is referred to as β processing.

For comparison with the above β treatment, another iron compound loading operation will be described. FIG. 7 shows this flowchart. In this loading operation, ferric sulfate was used as the iron salt, and sodium hydroxide was used as the alkali for pH adjustment. The pretreatment of activated carbon is the same as that of β treatment.
Vacuum suction at ° C. The solution is prepared by dissolving ferric sulfate in pure water to 0.6 mol / liter. The method of adding the solution is the same as in the β treatment.

After standing for a predetermined time, the pH of the ferric sulfate solution in which activated carbon is immersed is adjusted to 13 with an aqueous solution of sodium hydroxide adjusted to 1 mol / liter. This treatment results in the precipitation of iron hydroxide. This is a homogeneous precipitation method
In comparison, sediment forms rapidly and can be impure
It is a thing. After adjusting the pH, the mixture is allowed to stand in a thermostat at 30 ° C. to ripen the iron compound. The standing time is 6 hours. The subsequent washing and drying steps are the same as in the β treatment. This processing is called α processing.

FIG. 8 shows an experimental configuration for examining the characteristics of the activated carbon that has been subjected to the above treatment. 10 is a 30 l glass container, 11 and 14 are Teflon circulation pipes, 1
Reference numeral 2 denotes a sample column provided between the gas flow paths by the circulation pipes 11 and 14. Reference numeral 13 denotes a storage container for the activated carbon stored in the sample column 12, which has been treated as described above. Reference numeral 15 denotes a pump for circulating the gas.

Hereinafter, the experimental method will be described. A sample gas of a predetermined concentration is sealed in the glass container 10, and the pump 15 is operated to forcibly circulate the gas in the direction of the arrow. At this time, when the sample gas flows into the sample column 12 from the pipe 11 and passes through the activated carbon layer in the storage container 13, the sample gas is captured by the micropore action of the activated carbon supporting the iron compound. Therefore, the sample gas circulated from the pipe 14 to the glass container 10 is diluted from the initial state.

Here, nitric oxide, which is particularly difficult to remove among nitrogen oxides, is selected as the sample gas. The initial concentration of the sample gas is about 20 ppm, which is a mixture with air. 2.8 g of the activated carbon treated as described above is used in the storage container 13. The flow rate of the sample gas is
It is set to 27 l / min. Therefore, the flow velocity when passing through the activated carbon layer is set to 36
mm, it is 45 cm / sec. These setting conditions are based on the assumption of an indoor air purifier.

For comparison, the results are shown for coconut shell activated carbon in addition to BP charcoal. Here, the diameter is 1.8 mm.
A cylindrical granulated activated carbon having a length of 2 to 5 mm is employed.
This activated carbon has a peak pore radius of 10.4 angstroms measured by the H ₂ O adsorption method, a specific surface area measured by the BET method of 1350 m ² / g, and a benzene adsorption amount based on JIS K1474 of 42 wt%. Hereinafter, this coconut shell activated carbon is referred to as 2GS.

Thus, the following 11 types of measurements were performed. (1) Specific was β treatment surface area of 2500 m ² / g of BP charcoal (2) the ratio was β treatment surface area of 2000 m ² / g of BP charcoal (3) a specific surface area subjected to β treatment 1500 m ² / g BP coal (4) β-treated BP coal with a specific surface area of 1200 m ² / g (5) β-treated BP coal with a specific surface area of 1000 m ² / g (6) β-treated specific surface area Is 800 m ² / g of B
P coal (7) α-treated BP coal with a specific surface area of 2000 m ² / g (8) Untreated BP coal with a specific surface area of 2000 m ² / g (9) β-treated 2GS (10) α-treatment (11) Unprocessed 2GS FIG. 9 shows the measurement results. The horizontal axis indicates time, and the vertical axis indicates the residual rate of nitric oxide. For the measurement of the residual rate, the detector tube No. of Gastech Co., Ltd. was used. 10, No9
L, No. 11L is used. Hereinafter, the specific surface area is 20
00 m ² / g BP coal is BP-20, specific surface area is 150
0 m ² / g BP coal is BP-15, and the specific surface area is 800 m ²
/ G of BP coal is denoted as BP-8.

As can be seen from FIG. 9, when only BP-20 is used, it can be seen that the adsorption speed is higher in the order of ( 2 ), (7) and (8). Also, 2GS (9), (10),
In comparison with (11), it can be seen that in the same processing, the adsorption speed is lower in 2GS than in BP-20.

Further, only when the comparing specific surface area BP coal a peak BP charcoal 2500 m ² / g from 1500 m ² / g, or less 1200,1000 suction speed in the order of slower, the BP charcoal 800 m ² / g It can be seen that the adsorption speed becomes extremely slow.

As described above, the coconut shell activated carbon is a specific material having an extremely excellent adsorptivity as a non-polar adsorbent. However, in view of the adsorption performance of nitric oxide, ordinary untreated activated carbon is extremely adsorbed. Activated carbon made from phenolic resin has better adsorption performance because of poor performance.

[0030] However, phenolic resin poor adsorption performance in a normal untreated even with activated carbon as a raw material, must subjected to some kind of processing is used as an adsorbent for nitrogen monoxide, also process applied the uniform It can be seen that the β treatment, which is a precipitation method, has an overwhelmingly higher adsorption performance than the α treatment.

Further, even in the case of activated carbon using the same phenol resin as a raw material, the specific surface area has a great influence on the adsorption performance, and the specific surface area is from 2000 m ² / g to 1500 m ² / g.
Has the best adsorption performance and the specific surface area is 1000 m ²
/ G or less greatly degrades the performance.

When the specific surface area is greater than about 2500 m ² / g, the adsorption performance does not decrease, but the activated carbon itself becomes brittle and powdery, and cannot be present as granular activated carbon. Therefore, when used as an air freshener, a large amount of fine powder is generated and becomes unsuitable.

Next, the results of examining the removal characteristics of nitrogen dioxide will be reported. Similarly, the initial concentration of the sample gas is about 20 ppm
And a mixture with air.

Here, the following five types of measurements were performed. (1) BP-20 with β treatment (2) BP-15 with β treatment (3) BP-8 with β treatment (4) BP-20 with α treatment (5) No treatment BP-20 FIG. 10 shows the measurement results. The horizontal axis indicates time, and the vertical axis indicates the residual rate. For the measurement of the residual ratio, detection tubes No. 10, No. 9L and No. 11L of Gastech Co., Ltd. are used. As can be seen from FIG. 10, (1), (2),
It can be seen that there is no great difference between the suction speeds of (3), (4) and (5).

In view of the nitrogen dioxide adsorption performance, even ordinary untreated activated carbon has extremely excellent adsorption properties as compared with nitrogen monoxide.
It can be seen that the adsorption capacity of activated carbon is not weakened. In particular, it can be seen that in the β treatment, the adsorption capacity is higher than that of ordinary untreated activated carbon. In addition, it can be seen that the specific surface area does not affect the nitrogen dioxide adsorption performance.

Next, the results of examining the removal characteristics of sulfur dioxide will be reported. Similarly, the initial concentration of the sample gas is about 20 ppm, and is a mixture with air. Again, the following five types of measurements were performed.

(1) BP-20 subjected to β treatment (2) BP-15 subjected to β treatment (3) BP-8 subjected to β treatment (4) BP-20 subjected to α treatment (5) Unprocessed BP-20 FIG. 11 shows the measurement results. The horizontal axis indicates time, and the vertical axis indicates the residual rate. For the measurement of the residual ratio, a detector tube No. 5a of Gastech Co., Ltd. is used.

Similarly, as can be seen from FIG. 11, (1),
It can be seen that (2), (3), (4) and (5) do not differ greatly in the adsorption speed. Therefore, even from the viewpoint of the sulfur dioxide adsorption performance, it can be seen that ordinary untreated activated carbon has extremely excellent adsorption properties, and that the above-mentioned treatment does not weaken the adsorption ability of activated carbon. In particular, it can be seen that in the β treatment, the adsorption capacity is higher than that of ordinary untreated activated carbon. Further, it can be seen that the specific surface area does not affect the adsorption performance of sulfur dioxide.

Next, the results of examining the removal characteristics of hydrogen sulfide will be reported. In this case, the initial concentration of the sample gas is about 50 ppm
And a mixture with air. Other conditions are the same.
Again, the following five types of measurements were performed.

(1) BP-20 after β treatment (2) BP-15 after β treatment (3) BP-8 after β treatment (4) BP-20 after α treatment (5) Untreated BP-20 FIG. 12 shows the measurement results. The horizontal axis represents time, and the vertical axis represents the residual rate. For the measurement of the residual ratio, a Kitagawa gas detector tube SD type manufactured by Komei Rika Kogyo Co., Ltd. was used. Regarding the mechanism of removing hydrogen sulfide, activated carbon acts as a catalyst,
It is thought to be decomposing hydrogen sulfide. In terms of hydrogen sulfide removal performance, ordinary untreated activated carbon has extremely excellent removal performance. Also here (1)
(2), (3), (4), and (5) do not have much difference in removal speed. This indicates that the treatment does not reduce the catalytic ability of the activated carbon. In particular, it can be seen that in the β treatment, the catalytic ability is higher than that of ordinary untreated activated carbon. It can also be seen that the specific surface area has no effect here.

Next, the results of examining the benzene removal characteristics will be reported. Liquid benzene is dropped into the glass container 10 having a capacity of 30 l in FIG. 8 and adjusted so that the initial concentration becomes about 50 ppm. Other experimental conditions are the same.

Here, the following five types of measurements were performed. (1) BP-20 with β treatment (2) BP-15 with β treatment (3) BP-8 with β treatment (4) BP-20 with α treatment (5) No treatment BP-20 FIG. 13 shows the measurement results. The horizontal axis indicates time, and the vertical axis indicates the residual rate. FID (F
lame Ionization Detector)
High sensitivity gas chromatography is used. Benzene is a typical nonpolar molecule, and the adsorption mechanism of activated carbon is considered to be physical adsorption. In terms of benzene adsorption performance, ordinary untreated activated carbon has extremely excellent adsorption as shown in (5). Also,
In each of the cases (1), (2), (3), (4), and (5), there is little difference in the suction speed.
This shows that the β treatment and the α treatment do not weaken the physical adsorption ability of the activated carbon. It can also be seen that the specific surface area has no effect here.

Next, the adsorption isotherm is measured. The measuring method is as follows. First, 1 g of the treated activated carbon is put into a container having a known volume, the container is sealed, and a sample gas of a known concentration is injected. Thus, the amount of adsorption is determined from the initial concentration and the concentration after 24 hours.

Also in this case, the following five types of measurements were performed. (1) BP-20 with β treatment (2) BP-15 with β treatment (3) BP-8 with β treatment (4) BP-20 with α treatment (5) No treatment BP-20 FIGS. 14, 15, and 16 show adsorption isotherms of nitric oxide, sulfur dioxide, and benzene, respectively. Auxiliary means used for measurement used a detector tube for nitric oxide and sulfur dioxide and gas chromatography for benzene as in the above experiment.

As can be seen from the results of nitric oxide in FIG. 14, the adsorption line is located on the upper side in the order of (1), (4) and (5) in the case of BP-20. It can be seen that even if activated carbon as a raw material is used, the life performance is poor without ordinary treatment, and that the β treatment has a much higher life performance than the α treatment.

Further, BP-20, BP-15, BP-8
In comparison, BP-15 has almost the same life performance as BP-20, but the life performance of BP-8 is worse than these, and the specific surface area has a large influence.

As can be seen from FIGS. 15 and 16, the life performances of sulfur dioxide and benzene are (1), (2) and (3).
(4) and (5) show that there is no significant difference in the adsorption isotherm, and it can be seen that the life performance of the activated carbon is not weakened even if the β treatment and the α treatment are performed. Also, it can be seen that the specific surface area has no effect.

Next, an example of measuring the adsorption speed assuming the actual polluted atmosphere will be described. FIG. 17 shows the configuration used for this experiment. The measuring method is as follows. A vehicle air cleaner 21 containing the treated activated carbon is set in a container 20 having a volume of 2.5 m ³ , and after sealing the container 20, a sample gas of a known concentration is injected, and This is to determine a change with time. This assumes the inside of a car.

The amount of activated carbon was 150 g, and the air flow rate of the air purifier was 2.0 m3 / min. It is assumed that the inside of the container 20 is stirred by a fan 22 for stirring. The sample gas is set to be a mixed gas with air so as to be 1 ppm of nitrogen monoxide, 1 pm of nitrogen dioxide, 1 ppm of hydrogen sulfide, and 1 ppm of benzene. In this state, the on-vehicle air purifier is operated, and a change with time of each gas concentration is measured.

Here, the following two types of measurements were performed. (1) BP-20 treated with β (2) Untreated BP-20 was measured by measuring the absorbance of nitrogen dioxide by the Salzman method,
Nitric oxide was oxidized with potassium permanganate and then subjected to absorbance analysis by the Salzman method. Hydrogen sulfide was analyzed by FPD (Flam
e High-sensitivity gas chromatography with Photometric Detector, benzene is FID (FI
ame Ionization Detector)
High sensitivity gas chromatography was used.

FIGS. 18, 19, 20, and 21 show the measurement results of nitrogen monoxide, nitrogen dioxide, hydrogen sulfide, and benzene, respectively.

As can be seen from FIG. 18, even when the initial concentration is low and the mixed gas is used, the adsorption performance is poor with a normal untreated filter, and the filter treated with the β treatment is overwhelming. It can be seen that the adsorptive performance becomes high in the end.

19, 20, and 21, it can be seen that even if the filter has been subjected to the β treatment, the adsorption capacity of the activated carbon can be reduced.
It can be seen that the catalytic ability does not weaken.

From the results of the above experiments, according to the structure of this embodiment, the gas containing nitric oxide was produced by the uniform precipitation method.
After passing through the adsorption layer 2 of activated carbon carrying the iron compound, the activated carbon is trapped by the active action on nitric oxide, filled into the micropores of the activated carbon, and the nitric oxide is diluted. Become. Furthermore, harmful substances and malodorous substances such as nitrogen dioxide, sulfur dioxide, hydrogen sulfide and benzene are also removed by the adsorption ability and catalytic ability of activated carbon.

[0055]

As described above, according to the present invention, a phenolic resin having a molecular weight of 3,000 or more is used as a raw material, and activated carbon having a specific surface area of 1,000 m ² / g to 2500 m ² / g is formed by a uniform precipitation method. By using an air purifying agent loaded with an iron compound, the ability to remove nitric oxide can be dramatically increased without reducing the adsorption capacity and catalytic capacity of activated carbon and without generating a large amount of fine powder of activated carbon. It can be used as an air purifier for air purifiers for homes and vehicles, and it can be used as an air purifier for household and in-vehicle air purifiers. It can also be used as an agent, making it extremely useful.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an air purification device according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of the activated carbon.

FIG. 3 is a diagram showing pore distribution and cumulative pore volume measurement data of the activated carbon.

FIG. 4 is a view showing pore distribution and cumulative pore volume measurement data of the activated carbon.

FIG. 5 is a diagram showing pore distribution and cumulative pore volume measurement data of the activated carbon.

FIG. 6 is a flowchart for the preparation of activated carbon carrying the same iron compound.

FIG. 7 is a flowchart for preparing activated carbon carrying the same iron compound.

FIG. 8 is an experimental configuration diagram for examining characteristics of the activated carbon.

FIG. 9 is a characteristic diagram of the activated carbon.

FIG. 10 is a characteristic diagram of the activated carbon.

FIG. 11 is a characteristic diagram of the activated carbon.

FIG. 12 is a characteristic diagram of the activated carbon.

FIG. 13 is a characteristic diagram of the activated carbon.

FIG. 14 is a characteristic diagram of the activated carbon.

FIG. 15 is a characteristic diagram of the activated carbon.

FIG. 16 is a characteristic diagram of the activated carbon.

FIG. 17 is an experimental configuration diagram for examining another characteristic of the activated carbon.

FIG. 18 is a characteristic diagram of the activated carbon.

FIG. 19 is a characteristic diagram of the activated carbon.

FIG. 20 is a characteristic diagram of the activated carbon.

FIG. 21 is a characteristic diagram of the activated carbon.

[Explanation of symbols]

 2 Adsorption layer containing activated carbon carrying iron compound

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01J 20/00-20/34

Claims (1)

(57) [Claims] 1. A phenol resin having a molecular weight of 3000 or more is used as a raw material and has a specific surface area of 1000 m ² / g to 250 m ^2.
0 m ² / g of activated carbon produced by the homogeneous precipitation method.
An air purifier that carries the iron compound.