JP5305724B2 - Alkaline activated charcoal and method for producing the same - Google Patents

Description

  The present invention relates to alkali activated carbon and a method for producing the same.

  Conventionally, activated carbon has been used for applications such as polarizable electrodes and adsorbents of electric double layer capacitors because of its high specific surface area. Such activated carbon is generally produced by steam activation or chemical activation of raw materials such as coconut shell carbide, phenol resin carbide, and coal (for example, Patent Documents 1 and 2).

  In addition, the electric double layer capacitor is known as a large-capacity capacitor having an electric double layer generated at the interface between the polarizable electrode and the electrolyte as a storage principle, and is expected to have high performance as the electronics field advances. . In order to realize high performance of the electric double layer capacitor, it is necessary to further increase the specific surface area and increase the pore diameter of the activated carbon used as the electrode material.

  Thus, various activated carbons with a higher specific surface area and increased pore diameter and methods for producing such activated carbons have been proposed. For example, Patent Documents 3 to 6 disclose from nitrogen-containing compounds and sulfur-containing compounds. An activated carbon produced by steam activation using a specific raw material such as a reaction product of at least one selected compound and a condensed polycyclic compound, protein or protein-containing sludge, and a method for producing the same are disclosed.

Further, Patent Document 7 discloses activated carbon that further activates an alkali having a ratio of the specific surface area with a pore diameter of 20 mm (2.0 nm) or more and the total specific surface area of 0.30 or more after steam activation of the carbonaceous raw material. A manufacturing method is disclosed.
JP 2000-344508 A JP 2003-203829 A JP-A-5-811 JP-A-8-81210 Japanese Patent Laid-Open No. 2001-319837 JP 2002-33249 A JP-A-8-119614

In steam activation as described in Patent Documents 3 to 6, it was difficult to obtain activated carbon having a specific surface area of 2000 m ² / g or more even when the specific surface area was increased. On the other hand, in the alkali activation as described in Patent Document 7, although activated carbon having a specific surface area of 2000 m ² / g or more is obtained, it has such a high specific surface area of 2000 m ² / g and It was difficult to obtain activated carbon having an average pore diameter of 2.0 nm or more.

  This invention is made | formed in view of the said subject, Comprising: It aims at providing the alkali activated carbon which has a high specific surface area and a large diameter pore.

  The alkali activated carbon of the present invention is characterized by being obtained by alkali activating a nitrogen-containing material. By using a nitrogen-containing material as a raw material, an alkali activated carbon having a high specific surface area and large pores can be obtained.

  The alkali activated carbon is preferably obtained by carbonizing a nitrogen-containing material and alkali-activating the obtained carbide. The nitrogen content of the carbide of the nitrogen-containing material is preferably 4% by mass to 50% by mass. The nitrogen-containing material used in the production method is preferably a triazine compound or a triazine resin, more preferably a melamine or a derivative thereof, or a melamine resin.

The alkali activation charcoal, BET specific surface area of 2000m ² / g~3500m ² / g, an average pore diameter of the total pore volume is determined by 1.0cm ³ /g~3.0cm ³ / g, BJH method 2. It is preferable that it is 0 nm-4.0 nm.

  The present invention also includes a method for producing alkali-activated charcoal, characterized by alkali-activating a nitrogen-containing material.

  According to the present invention, an alkali activated carbon having a high specific surface area and large pores can be obtained.

  The alkali activated carbon of the present invention is characterized by being obtained by alkali activating a nitrogen-containing material.

  The nitrogen-containing material used for the alkali activated carbon of the present invention will be described.

  The nitrogen-containing material is not particularly limited as long as it has a nitrogen atom. For example, methylol melamine, dimethylol melamine, trimethylol melamine, melamine, guanamine, guanidine, urea, aniline, aromatic or aliphatic sulfonamide Amino compounds such as 4,4'-diphenylmethane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, triphenylmethane triisocyanate, etc .; nitrile compounds such as acetonitrile, propionitrile, butyronitrile, isobutyronitrile, acrylonitrile Nitro compounds such as dinitronaphthalene; imidazole compounds such as imidazole and benzimidazole; carbazole compounds such as carbazole and N-methylcarbazole Acridine compounds such as acridine and 9-methylacridine; pyridine compounds such as pyridine and aminopyridine; pyrrole compounds such as pyrrole and methylpyrrole; nitrogen-containing compounds such as melamine resins; guanidine resins; urea resins; aniline resins; Examples thereof include sulfonamide resins; imide resins; urethane resins; nitrile resins such as polyacrylonitrile; polybenzimidazole resins; carbazole resins; acridine resins; pyridine resins; These nitrogen-containing materials may be used alone or in combination of two or more.

  Among the nitrogen-containing materials, those used in the present invention are preferably triazine compounds or triazine resins having a triazine ring structure in the molecule or resin structure. As the triazine compound, for example, melamine and its derivatives are suitable. As said triazine resin, a melamine resin is suitable, for example.

  As said melamine and its derivative (s), the compound represented by following General formula (1) is mentioned, for example.

[Wherein, R ^{1 to} R ⁶ are the same or different and each represents a hydrogen atom, an acryloyl group, an epoxy group, an acryloyl group and / or an epoxy group, and an alkyl group having 1 to 12 carbon atoms and a carbon number Represents a hydroxyalkyl group having 1 to 12 carbon atoms and an alkyl ether group having 1 to 12 carbon atoms. ]

In the general formula (1), examples of the alkyl group having 1 to 12 carbon atoms that may have an acryloyl group and / or an epoxy group represented by R ^{1 to} R ⁶ include, for example, a methyl group, an ethyl group, and a propyl group. Group, butyl group, pentyl group, hexyl group, hepsyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, glycidyl group and the like. In the general formula (1), the hydroxyalkyl group having 1 to 12 carbon atoms represented by R ¹ to R ^6, for example, methylol group, ethylol group, pro pyrrole group, Buchiroru group, pliers roll group, Hekishiroru group , Heptylol group, octylol group, nonylol group, decanol group, undecanol group, dodecanol group and the like. In the general formula (1), examples of the alkyl ether group having 1 to 12 carbon atoms represented by R ^{1 to} R ⁶ include a methyl ether group, an ethyl ether group, a propyl ether group, a butyl ether group, a pentyl ether group, Examples include a hexyl ether group, a hepsyl ether group, an octyl ether group, a nonyl ether group, a decyl ether group, an undecyl ether group, and a dodecyl ether group.

  Specific examples of the melamine represented by the general formula (1) or a derivative thereof include, for example, melamine; alkyl melamine such as trimethyl melamine and triethyl melamine; hydroxyalkyl melamine such as methylol melamine and ethylol melamine; methyl ether melamine; Examples include alkyl ether melamines such as ethyl ether melamine; acrylic-modified melamines such as melamine triacrylate; and epoxy-modified melamines such as trisglycidyl melamine. These melamines or derivatives thereof may be used alone or in combination of two or more. Among these, hydroxyalkyl melamines such as methylol melamine and ethylol melamine; alkyl ether melamines such as ethyl ether melamine are preferable. In particular, methylol melamine and methyl ether melamine capable of constituting a network structure in which triazine rings are crosslinked are suitable.

  The melamine resin is not particularly limited, and examples thereof include those obtained from methylol melamine, methyl ether melamine, acrylic modified melamine, epoxy modified melamine and / or melamine resin prepolymer. As the melamine resin, those into which various functional groups are introduced can be used, for example, amino group-containing melamine resin, imino group-containing melamine resin, methylol group-containing melamine resin, hydroxyalkyl group-containing melamine resin, alkyl ether group-containing Melamine resins, acryloyl group-containing melamine resins, epoxy group-containing melamine resins and the like can also be used, and alkylated melamine resins in which these functional groups are modified with alkyl groups can also be used. The melamine resin includes a melamine resin prepolymer that is a precursor of the melamine resin.

  Specific examples of the nitrogen-containing material are trade names, for example, “Nikarak MW-30M”, “Nikarak MW-30”, “Nikarak MX-45”, “Nikarak MX-302” manufactured by Sanwa Chemical Co., Ltd. Melamine resin such as “Super Fall (registered trademark) Double King” manufactured by Lek; Urethane resin such as “Urethane” manufactured by Sampleratec; “ABS (acrylonitrile-butadiene-styrene copolymer manufactured by Sampleratech) Nitrile resin such as “)”.

  The nitrogen-containing material may include a compound that does not contain nitrogen or a resin that does not contain nitrogen as long as the effects of the present invention are not impaired.

  The nitrogen content of the nitrogen-containing material is preferably 4% by mass or more, more preferably 10% by mass or more, further preferably 20% by mass or more, preferably 90% by mass or less, more preferably 80% by mass or less, More preferably, it is 70 mass% or less. If the nitrogen content is 4% by mass or more, it becomes easy to produce alkali activated carbon having mesopores and a high specific surface area, and if it is 90% by mass or less, it has mesopores, And the alkali activated carbon which has a high specific surface area can be produced with a high activation yield.

  In the present invention, the nitrogen-containing material may be used as it is, but a nitrogen-containing material carbide obtained by carbonizing the nitrogen-containing material (hereinafter sometimes referred to as “nitrogen-containing carbide”) may be used. preferable. A method for carbonizing the nitrogen-containing material will be described later.

  When using the nitrogen-containing carbide, the nitrogen content of the nitrogen-containing carbide is preferably 4% by mass or more, more preferably 5% by mass or more, preferably 50% by mass or less, more preferably 40% by mass or less. is there. If the nitrogen content of the nitrogen-containing carbide is 4% by mass or more, it becomes easy to produce alkali activated carbon having mesopores and a high specific surface area. Alkaline activated carbon having a high specific surface area can be produced with a high activation yield.

  The alkali activation employed in the present invention will be described.

  Alkaline activation is an activation method in which the nitrogen-containing material or nitrogen-containing carbide and an alkali activator are mixed and heated to perform activation treatment. Here, the “activation process” is a process of forming pores in the nitrogen-containing material to increase the specific surface area and the pore volume.

  As an alkali activator used for alkali activation, an alkali metal compound is preferable. Examples of the alkali metal compound include hydroxides such as sodium hydroxide, potassium hydroxide, and lithium hydroxide; carbonates such as sodium carbonate, potassium carbonate, and lithium carbonate. These alkali activators may be used alone or in combination of two or more. Of these, potassium hydroxide is preferred.

  The amount of the alkali activator used is preferably such that the mass ratio of the activated nitrogen-containing material or nitrogen-containing carbide to the alkali activator (alkali activator / nitrogen-containing material or nitrogen-containing carbide) is 1 or more. More preferably, it is 1.5 or more, More preferably, it is 2.0 or more, It is preferable to set it as 4.5 or less, More preferably, it is 4.0 or less, More preferably, it is 3.5 or less.

  Moreover, when adding an alkali activator, you may use an alkali activator as aqueous solution in order to fully mix with a nitrogen-containing material or nitrogen-containing carbide | carbonized_material. The amount of water used at this time is preferably 0.05 times by mass to 10 times by mass of the alkali activator. In addition, when using an alkali activator as an aqueous solution, before performing the heating for the activation treatment, heating at a temperature lower than the heating temperature in the activation treatment is performed for the purpose of removing moisture for preventing bumping of moisture. It is preferable.

  The heating temperature for performing the activation treatment is preferably 600 ° C. or higher, more preferably 650 ° C. or higher, preferably 950 ° C. or lower, more preferably 900 ° C. or lower. In addition, the heating time in performing the activation treatment is preferably 0.1 hour or longer, more preferably 1.5 hours or longer, 3.5 hours or shorter, more preferably 3 hours or shorter. The atmosphere during heating is preferably an inert gas atmosphere such as argon, helium, or nitrogen.

The specific surface area of the alkali activated carbon of the present invention is preferably 2000 m ² / g or more, more preferably 2100 m ² / g or more, preferably 3500 m ² / g or less, more preferably 3300 m ² / g or less. Here, in the present invention, the specific surface area is a value determined by the BET method for measuring the nitrogen adsorption isotherm of porous carbon.

The total pore volume of the alkali activated carbon of the present invention is preferably 1.0 cm ³ / g or more, more preferably 1.5 cm ³ / g or more, preferably 3.0 cm ³ / g or less, more preferably 2. 8 cm ³ / g or less. Here, in the present invention, the total pore volume means that the relative pressure P / P ₀ (P: pressure of the adsorbate gas in the adsorption equilibrium, P ₀ : saturated vapor pressure of the adsorbate at the adsorption temperature) is 0.93. It is a value calculated | required by BET method which measures the nitrogen adsorption amount until.

  The average pore diameter of the alkali activated carbon of the present invention is preferably 2.0 nm or more, more preferably 2.1 nm or more, preferably 4.0 nm or less, more preferably 3.5 nm or less. Here, in the present invention, the average pore diameter is based on the assumption that the pore shape is cylindrical using the specific surface area determined by the BET method of alkali activated carbon and the total pore volume determined by the BET method. This is a calculated value, which can be obtained by the following equation (1).

  The nitrogen content of the alkali activated carbon of the present invention is preferably 0.8% by mass or more, more preferably 1.0% by mass or more, still more preferably 1.2% by mass or more, and preferably 50% by mass or less, More preferably, it is 40 mass% or less, More preferably, it is 30 mass% or less. If the nitrogen content of the alkali activated carbon is 0.8 mass% or more, the surface of the alkali activated carbon can be made hydrophilic, and the capacitance of the electric double layer capacitor using the alkali activated carbon as an electrode material is improved. If it is 50 mass% or less, the thermal stability of alkali activated carbon can be improved.

  In addition, the specific surface area, total pore volume, average pore diameter, and the like of the alkali activated carbon of the present invention can be adjusted by appropriately selecting a nitrogen-containing material used for the raw material, heating conditions for alkali activation, and the like.

  Next, the manufacturing method of the alkali activated carbon of this invention is demonstrated.

  In the method for producing alkali activated carbon of the present invention, the mass ratio of the nitrogen-containing material and the alkali activator (alkali activator / nitrogen-containing material) is mixed in the range of 1 to 4.5, and the resulting mixture is 600 ° C. Heating at ˜950 ° C. to activate the alkali. In addition, what is necessary is just to perform alkali activation on the conditions mentioned above.

  Moreover, as a manufacturing method of the alkali activated carbon of this invention, before carrying out alkali activation, it is preferable to heat and carbonize a nitrogen containing compound at 500 to 900 degreeC.

  In the present invention, the nitrogen-containing material is carbonized by heating in an inert atmosphere. As an inert atmosphere, inert gas atmospheres, such as argon, helium, and nitrogen, are mentioned. The heating temperature when performing the carbonization treatment is preferably 500 ° C. or higher, more preferably 600 ° C. or higher, 900 ° C. or lower, more preferably 800 ° C. or lower. In addition, the heating time for performing the carbonization treatment is preferably 0 hour or longer, more preferably 1.0 hour or longer, preferably 10 hours or shorter, more preferably 5 hours or shorter.

  In addition, as a nitrogen-containing material, when using the nitrogen-containing compound which can be bridge | crosslinked by heating, such as methylol melamine, you may perform a thermosetting process before performing the said carbonization process. What is necessary is just to adjust the heating temperature and heating time of a thermosetting process suitably according to the nitrogen containing compound used. For example, when methylol melamine is used, the heating temperature is 200 ° C. or more and 400 ° C. or less, more preferably 250 ° C. or more and 350 ° C. or less, and the heating time is 0.5 hours or more and 10 hours or less, more preferably 1 hour or more and 5 hours. The following is preferable.

  In the method for producing alkali activated carbon of the present invention, in addition to the carbonization treatment and alkali activation, a washing treatment, a heat treatment, and a pulverization treatment may be performed.

  The washing treatment is a treatment for washing and drying the alkali activated carbon after alkali activation. Since the alkali activated metal used as the alkali activator adheres to the surface of the alkali activated charcoal after the alkali activation, the alkali activated charcoal is washed in order to remove such deposits. Examples of the washing of the alkali activated carbon include water washing and acid washing.

  The washing method is not particularly limited, but it is preferable to carry out, for example, by adding alkali activated charcoal to water, stirring and dispersing as necessary, and then filtering. The stirring and dispersion can be performed by mechanical stirring, gas blowing, and ultrasonic application, but can also be performed by heating and boiling. The water temperature during washing is preferably 30 ° C. or higher, more preferably 40 ° C. or higher, and further preferably 50 ° C. or higher. The stirring and dispersing time is preferably 0.5 hours or more, more preferably 1 hour or more, and further preferably 1.5 hours or more.

  The acid cleaning is cleaning performed using a cleaning liquid containing an inorganic acid, an organic acid, or the like. By performing the acid cleaning, the alkali metal hydroxide used as the alkali activator can be efficiently removed.

  Examples of the inorganic acid include hydrochloric acid, nitric acid, sulfuric acid, and phosphoric acid. These inorganic acids may be used alone or in combination of two or more. When the inorganic acid is used, the concentration of the inorganic acid in the cleaning liquid is preferably 0.5 mol / L or more, more preferably 1.0 mol / L or more, still more preferably 1.5 mol / L or more, and 3.5 mol / L. L or less is preferable, More preferably, it is 3.0 mol / L or less, More preferably, it is 2.5 mol / L or less. Although the method of acid cleaning using an inorganic acid is not particularly limited, for example, mesopore activated carbon and a cleaning liquid containing an inorganic acid are mixed and stirred at a temperature of 50 ° C. to 100 ° C. for 30 minutes to 120 minutes. It is preferable to do so.

  Examples of the organic acid include formic acid, oxalic acid, malonic acid, succinic acid, acetic acid, propionic acid, and the like. These organic acids may be used alone or in combination of two or more. The concentration of the organic acid in the cleaning liquid containing the organic acid is preferably 1 vol% or more, more preferably 2 vol% or more, further preferably 5 vol% or more, and preferably 100 vol% or less, more preferably 80 vol%, Preferably it is 60 vol% or less. By setting the concentration of the organic acid to 1 vol% or more, the effect of removing the metal component by the organic acid can be obtained. However, if the concentration is too high, the manufacturing cost increases, which is not preferable. The method of acid cleaning using an organic acid is, for example, mixing alkali activated charcoal and a cleaning solution containing an organic acid, and stirring the resulting mixture at a temperature of 20 ° C. to 80 ° C. for 1 minute to 120 minutes. It is preferable to carry out by doing. The alkali activated carbon after washing is preferably dried at 50 to 120 ° C. for 0.5 to 2.0 hours.

  In the manufacturing method of the alkali activated carbon of this invention, it is preferable to perform acid washing and water washing as a washing process, More preferably, after performing acid washing, it is the aspect which performs water washing several times.

  The heat treatment is a treatment in which the alkali activated charcoal after alkali activation or after the washing treatment is further heated in an inert gas atmosphere. By performing heat treatment on the alkali activated carbon, the amount of functional groups on the surface of the alkali activated carbon can be adjusted.

  As the heat treatment, an embodiment in which the alkali activated charcoal immediately after alkali activation is heat-treated in an inert gas atmosphere; an embodiment in which the alkali activated charcoal after alkali activation is heat-treated in an inert gas atmosphere after acid washing and / or water washing And so on. As said inert gas, argon, nitrogen, helium etc. can be used, for example. The heat treatment temperature is not particularly limited, but is preferably 400 ° C. or higher and 1000 ° C. or lower.

  The pulverization process is a process of performing pulverization for adjusting the particle size of the alkali activated carbon. The method for pulverizing the alkali activated carbon is not particularly limited, and may be performed using a disk mill, a ball mill, a bead mill or the like. The average particle diameter of the alkali activated carbon after pulverization is preferably 15 μm or less, more preferably 10 μm or less, preferably 1 μm or more, and more preferably 2 μm or more. When the average particle diameter is within the above range, when alkali activated carbon is used as the electrode material for the electric double layer capacitor, the binding property between the current collector plate and the electrode material layer in the electrode is improved, and the practical binding is achieved. It is possible to reduce the amount of the binder of the electrode material layer necessary for maintaining the property. Here, the average particle size is a volume-based median obtained by measuring a sample dispersed in water using a laser diffraction particle size distribution measuring apparatus (for example, “SALD (registered trademark) -2000” manufactured by Shimadzu Corporation). Is the diameter.

  The alkali activated carbon of the present invention can be used as an electrode material for an electric double layer capacitor, activated carbon, and an adsorbent. Since the alkali activated carbon of the present invention has a high specific surface area and large pores, it is particularly suitable as an electrode material for electric double layer capacitors.

  The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to the following examples, and may be appropriately modified and implemented within a range that can meet the purpose described above and below. All of which are within the scope of the present invention.

Evaluation method 1. Specific surface area, total pore volume and average pore diameter After heating 0.2 g of alkali activated carbon at 200 ° C. under vacuum, adsorption isotherm by N ₂ gas adsorption method using a nitrogen adsorption device (ASAP-2400, manufactured by Shimadzu Corporation) A line was determined, and the specific surface area and total pore volume were determined by the BET method. The average pore diameter was calculated based on the above formula (1) using the specific surface area and total pore volume determined by the BET method.

2. Nitrogen content Using an elemental analyzer (manufactured by Yanagimoto Seisakusho, model MT-700HCN), the sample was burned, the generated gas was analyzed, and the carbon, hydrogen, and nitrogen contents in the sample were determined.

Production Example 1
Melamine resin as a nitrogen-containing material (manufactured by Lek Co., Ltd., trade name “Super Decay (registered trademark) Double King” (nitrogen content: about 60% by mass)) is heated at 700 ° C. for 2 hours in a nitrogen atmosphere and carbonized. Went. The nitrogen content of the obtained nitrogen-containing carbide was 35% by mass. 20 g of nitrogen-containing carbide was weighed, and potassium hydroxide was added thereto as an alkali activator so that the mass ratio was 2.5 times, and mixed well. Next, the mixture of the nitrogen-containing carbide and the alkali activator was heated at 800 ° C. for 2 hours in a nitrogen atmosphere to perform alkali activation.

  The obtained activated material is put in a container, 1.7 L of pure water and 0.3 L of hydrochloric acid (concentration: 35% by mass) are added thereto, heated to 100 ° C. and boiled for 2 hours, and then the activated material is collected by filtration. This was washed with hydrochloric acid. Thereafter, 2 L of water was added to the activated product after washing with hydrochloric acid, heated to 100 ° C. and boiled for 2 hours, and then the activated product was filtered to perform warm water washing. The same operation was repeated, and washing with warm water was further performed once. The activated product that had been washed once with hydrochloric acid and washed twice with warm water was dried at 110 ° C. for 1 hour. The activated product after drying was pulverized using a disk mill and adjusted so that the average particle size was 8 μm, whereby alkali activated carbon 1 was obtained.

The obtained alkali activated carbon 1 had a specific surface area of 2605 m ² / g, a total pore volume of 2.025 cm ³ / g, and an average pore diameter of 2.64 nm. The results are shown in Table 1.

Production Example 2
Alkaline activated charcoal 2 in the same manner as in Production Example 1 except that methyl ether melamine (manufactured by Sanwa Chemical Co., Ltd., trade name “Nicarac MW-30M” (nitrogen content: about 40 mass%)) was used as the nitrogen-containing material. Got. The nitrogen content of the obtained nitrogen-containing carbide was 24% by mass. The obtained alkali activated carbon 2 had a specific surface area of 2452 m ² / g, a total pore volume of 1.671 cm ³ / g, and an average pore diameter of 2.37 nm. The results are shown in Table 1.

Production Example 3
Alkaline activated charcoal 3 was obtained in the same manner as in Production Example 1 except that delayed petroleum coke (trade name “delayed coke”, nitrogen content 3.1 to 3.3 mass%) was used as a raw material. . The obtained alkali activated carbon 3 had a specific surface area of 2815 m ² / g, a total pore volume of 1.423 cm ³ / g, and an average pore diameter of 1.60 nm. The results are shown in Table 1.

Production Example 4
Alkaline activated charcoal 4 is obtained in the same manner as in Production Example 1 except that phenol resin (trade name “Sumilite Resin (registered trademark)”, nitrogen content 2.1 mass%) manufactured by Sumitomo Bakelite Co., Ltd. is used as a raw material. It was. The obtained alkali activated carbon 4 had a specific surface area of 2686 m ² / g, a total pore volume of 1.265 cm ³ / g, and an average pore diameter of 1.43 nm. The results are shown in Table 1.

Production Example 5
Methyl ether melamine as a nitrogen-containing material (manufactured by Sanwa Chemical Co., Ltd., trade name “Nicalak MW-30M” (nitrogen content; approximately 40% by mass)) is heated at 700 ° C. for 2 hours in a nitrogen atmosphere to be carbonized. went. The nitrogen content of the obtained nitrogen-containing carbide was 24% by mass. 30 g of nitrogen-containing carbide was weighed and heated for 2 hours at 800 ° C. in a nitrogen atmosphere to activate steam.

  The obtained activated material was dried at 110 ° C. for 1 hour. The activated product after drying was pulverized using a disk mill and adjusted so that the average particle size was 6 μm, thereby obtaining steam activated charcoal.

The obtained steam activated charcoal had a specific surface area of 594 m ² / g, a total pore volume of 0.280 cm ³ / g, and an average pore diameter of 1.5 nm. The results are shown in Table 1.

The alkali activated carbons 1 and 2 are obtained by alkali activating nitrogen-containing materials. These alkali activation coal 1,2 has a specific surface area of 2605m ² / g, a 2452m ² / g and high specific surface area, and an average pore size was large 2.64Nm, and 2.37Nm. In contrast, Diredo petroleum coke as a raw material, the alkali activation coal 3,4 with phenol resin, a specific surface area of 2815m ² / g, is a 2686m ² / g and high specific surface area, average pore size of 1. They were as small as 60 nm and 1.43 nm.

  Further, the steam activated charcoal uses a nitrogen-containing material as a raw material. However, since the activation method is steam activation, the specific surface area and the average pore diameter are both small.

  The present invention is useful for alkali activated carbon having a high specific surface area and large pores.

Claims (7)

Nitrogen content, the nitrogen-containing material is 10 mass% or more, alkali activation coal, characterized in that it is obtained by alkali activation. Alkali activation coal according to claim 1 obtained by the nitrogen-containing nitrogen content that is obtained by carbonizing the material a nitrogen-containing carbide which is 5% by mass to 50% by the alkali activation.   The alkali activated carbon according to claim 1 or 2, wherein the nitrogen-containing material is a triazine compound or a triazine resin.   The alkali-activated charcoal according to any one of claims 1 to 3, wherein the nitrogen-containing material is melamine, a derivative thereof, or a melamine resin. BET specific surface area of 2000m ² / g~3500m ² / g, total pore volume 1.0cm ³ /g~3.0cm ³ / g, an average pore diameter determined by a BJH method in 2.0nm~4.0nm The alkali activated carbon as described in any one of Claims 1-4. The mass ratio of the nitrogen-containing material and the alkali activator (alkali activator / nitrogen-containing material) is mixed in the range of 2.0 to 4.5, and the resulting mixture is heated at 600 ° C. to 950 ° C. to activate the alkali. The manufacturing method of the alkali activated carbon as described in any one of Claims 1-5 characterized by the above-mentioned. A nitrogen-containing carbide having a nitrogen content of 5% by mass to 50% by mass obtained by heating and carbonizing the nitrogen-containing material at 500 ° C. to 900 ° C. and the alkali activator are mixed. Item 7. A method for producing alkali-activated charcoal according to Item 6.