JP6874152B2 - Flavor suction goods - Google Patents

Description

The present invention relates to a flavor-sucking article.

As a suction article for the user to taste the tobacco flavor, a combustion-type smoking article that provides the user with the tobacco flavor by burning the tobacco flavor source, and a heating that provides the user with the tobacco flavor by heating the tobacco flavor source without burning it. There are known type flavor suction articles and non-heated flavor suction articles that provide the user with the tobacco flavor of the tobacco flavor source without heating or burning the tobacco flavor source. In the present specification, suction articles for which a user tastes a flavor such as tobacco flavor are collectively referred to as "flavor suction articles".

Flavor-sucking articles generally include a filter for filtering components derived from the flavor source, the filter containing activated carbon as an adsorbent (see, eg, WO 2008/146543). Filters containing activated carbon are called charcoal filters and are well known in the art. In the charcoal filter, the activated carbon adsorbs miscellaneous flavor components, but the amount of the activated carbon added is determined according to the product specifications so as not to adsorb too much the components that contribute to the flavor.

Activated carbon is known to have higher adsorption performance as the specific surface area and pore volume increase. However, as the specific surface area and pore volume of the activated carbon increase, the pores (fine pores) increase, so that the strength of the activated carbon decreases. Therefore, the present inventors have focused on the fact that it is difficult to achieve both the adsorption performance and the strength of activated carbon.

On the other hand, the production of flavor-sucking articles has been accelerated in recent years, and the load on activated carbon during the production process is increasing. When the load applied to the activated carbon increases, the activated carbon may be crushed and the amount added to the flavor-sucking article may become non-uniform. Keeping the amount of activated carbon added uniform is important for keeping the flavor of each article uniform.

In view of the above circumstances, an object of the present invention is to provide a flavor-sucking article containing activated carbon, which has excellent adsorption performance and is stable in shape.

According to one aspect of the present invention, ^{a flavor containing activated carbon having a BET specific surface area of 1050 m 2} / g or more and a ratio of the peak intensity of the G band to the peak intensity of the D band in the Raman spectrum being 0.85 or more. A suction article is provided.

According to the present invention, it is possible to provide a flavor suction article containing activated carbon which is excellent in adsorption performance and stable in shape.

Sectional drawing of the combustion-type smoking article which concerns on 1st Embodiment. Sectional drawing of the combustion-type smoking article which concerns on 2nd Embodiment. The graph which shows the pore distribution curve. The graph which shows the pore distribution curve. The graph which shows the measurement result of the Raman spectrum. The graph which shows the measurement result of the Raman spectrum. The graph which shows the G / D ratio calculated from the measurement result of the Raman spectrum. A graph showing the results of thermal weight / differential thermal analysis. The graph which shows the measurement result of the amount of oxygen-containing functional groups. The graph which shows the amount of ammonia adsorption. The graph which shows the physical adsorption amount of ammonia and the chemical adsorption amount of ammonia. The graph which showed the adsorption isotherm of FIG. 11 by DA plot. The graph which shows the reduction rate of ammonia in the mainstream cigarette smoke. The graph which shows the reduction rate of the vapor component in the mainstream cigarette smoke.

The applicant reported that when the activated carbon is subjected to liquid phase oxidation treatment, a high concentration of oxygen-containing functional groups can be introduced into the surface of the activated carbon, but the BET specific surface area of the activated carbon is reduced and the adsorptive capacity is lowered. (Japanese Patent Laid-Open No. 2010-193718). In this way, when an oxygen-containing functional group is introduced on the surface of activated carbon, the π-electron conjugated bond of carbon is broken and ^{the defect of SP 2} bond is increased, so that the peak intensity of the D band in the Raman spectrum (this is graphene of carbon). It is considered that the index of structural defects) will increase.

Contrary to such common general knowledge, when the present inventors performed a vapor phase oxidation treatment on activated carbon having a predetermined BET specific surface area, the BET specific surface area of the activated carbon increased in addition to the introduction of oxygen-containing functional groups. Furthermore, it was newly found that the peak intensity of the D band in the Raman spectrum is maintained or reduced. Based on such discoveries, the present inventors have completed a flavor-sucking article containing activated carbon, which has excellent adsorption performance and is stable in shape.

That is, in the present invention, the BET specific surface area is 1050 m ² / g or more, and the ratio of the peak intensity of the G band to the peak intensity of the D band in the Raman spectrum (hereinafter, also referred to as G / D ratio) is 0.85 or more. The present invention relates to a flavor suction article containing activated carbon.

In the present specification, the flavor suction article is an arbitrary suction article that includes a flavor source and allows the user to taste the flavor derived from the flavor source. Specifically, the flavor is provided to the user by burning the flavor source. Combustion-type smoking articles, heated flavor-sucking articles that provide the user with flavor by heating the flavor source without burning, and non-heated articles that provide the flavor of the flavor source to the user without heating or burning the flavor source. Examples include mold flavor suction articles.

Hereinafter, a cigarette, which is a typical example of a combustion-type smoking article containing a tobacco flavor source, will be described.

1. 1. Combustion-type smoking article An example of the combustion-type smoking article will be described with reference to FIG.
FIG. 1 is a cross-sectional view of the combustion type smoking article 1 according to the first embodiment. The combustion-type smoking article 1 shown in FIG. 1 is a cigarette.
The combustion-type smoking article 1 shown in FIG. 1 is
A tobacco rod 10 including a tobacco flavor source 10a and a tobacco wrapping paper 10b that wraps around the tobacco flavor source 10a.
Two filter plugs 21 are arranged apart from each other through a hollow portion, and each filter plug 21 is a filter plug 21 including a filter medium 21a and a plug winding paper 21b wound around the filter medium 21a, and two filter plugs 21. A filter 20 containing a filter-molded paper 22 wound around the filter plug 21 so as to form a hollow portion between the filter plugs 21 and an activated carbon 23 located in the hollow portion.
The tobacco rod 10 and the chip paper 30 wound on the filter 20 are included so as to connect the tobacco rod 10 and the filter 20.

In the combustion type smoking article 1 shown in FIG. 1, two filter plugs 21 are arranged via one hollow portion, but n (n-1) filter plugs (n is an integer of 2 or more) are arranged. It may be arranged through the hollow portion of the above, for example, n is 2 to 4, preferably n is 2 to 3, and more preferably n is 2.

In the combustion-type smoking article shown in FIG. 1, conventionally known ones can be used as the tobacco rod 10, the components of the filter 20 other than the activated carbon 23, and the chip paper 30. As the activated carbon 23, those described below can be used.

The activated carbon 23 has a BET specific surface area of 1050 m ² / g or more, and the ratio of the peak intensity of the G band to the peak intensity of the D band in the Raman spectrum is 0.85 or more.

In the present specification, the "BET specific surface area" means the specific surface area obtained by using the BET adsorption isotherm equation (Brunauer, Emmet and Teller's equation). BET specific surface area of the activated carbon 23 is preferably 1050~1600m ² / g, more preferably 1150~1600m ² / g, more preferably from 1150~1300m ² / g. If the BET specific surface area is too small, it is difficult for the activated carbon 23 to exhibit excellent adsorption performance. Further, if the BET specific surface area is too large, the adsorption performance of the activated carbon 23 is improved, but the shape stability may be lowered.

In the present specification, the "G band" is ^{a peak detected near 1600 cm -1} in the Raman spectrum obtained by Raman spectroscopy, and the G band is derived from the graphene structure of carbon. ^{The "D band" is a peak detected near 1300 cm -1} in the Raman spectrum obtained by Raman spectroscopy, and the D band is derived from a defect in the graphene structure of carbon. Therefore, activated carbon having a large ratio of the peak intensity of the G band to the peak intensity of the D band in the Raman spectrum (hereinafter, also referred to as G / D ratio) is highly crystallized, has few structural defects, and is stable in shape. There is a tendency. The Raman spectrum can be obtained using, for example, a microlaser Raman Nicolet Almega XR (manufactured by Thermo Fisher Scientific Co., Ltd.).

The G / D ratio of the activated carbon 23 is preferably 0.85 to 1.1, more preferably 0.9 to 1.1. If the G / D ratio is too small, it is difficult for the activated carbon 23 to achieve excellent shape stability. The upper limit of the G / D ratio is set by the production limit of activated carbon.

The activated carbon 23 has, for example, an average particle size of 200 μm to 1000 μm, preferably an average particle size of 300 μm to 700 μm, and more preferably an average particle size of 400 μm to 600 μm. Here, the "average particle size" means the particle size (d50) at which the volume integrated value is 50% in the particle size distribution obtained by the laser diffraction / scattering method.

The pore volume of the activated carbon 23 is preferably 0.5 cm ³ / g or more, more preferably in the range of 0.5~0.8cm ³ / g, 0.52~0.74cm ³ / It is more preferably in the range of g. If the pore volume is too small, it is difficult for the activated carbon 23 to exhibit excellent adsorption performance. If the pore volume is too large, the adsorption performance of the activated carbon 23 is improved, but the shape stability may be lowered.

As used herein, "pore volume" means the total volume of pores having a pore diameter of about 40 nm or less. The pore volume is a value calculated from the amount of nitrogen adsorbed when the _{relative pressure P / P 0} is 0.95 on the nitrogen adsorption isotherm measured at a temperature of 77 K.

The nitrogen adsorption isotherm can be obtained as follows. First, in 77K (boiling point of nitrogen) nitrogen gas, the nitrogen gas adsorption amount (mL / mL) of activated carbon is measured for each pressure P while gradually increasing the pressure P (mmHg) of the nitrogen gas. Next, the value obtained by dividing the pressure P (mmHg) by the saturated vapor pressure P ₀ (mmHg) of nitrogen gas is defined as the relative pressure P / P ₀ , and the amount of nitrogen gas adsorbed for each relative pressure P / P _{0 is plotted for adsorption.} An isotherm can be obtained. The nitrogen adsorption isotherm can be obtained by using, for example, a gas adsorption amount measuring device AutoSorb-1 (manufactured by Quantachrome).

Of the pore volumes of the activated carbon 23, the volume of pores having a pore diameter of less than 2 nm (that is, the volume of micropores) is ^{preferably 0.4 cm 3} / g or more, and is ^{0.4 to 0.7 cm 3} /. It is more preferably in the range of g, and even more preferably in ^{the range of 0.4 to 0.6 cm 3 / g.} When the activated carbon 23 has the above-mentioned size and micropore volume, it is particularly advantageous in achieving excellent adsorption performance.

In the present specification, the "micropore volume" is a value calculated from the nitrogen adsorption isotherm by performing pore distribution analysis by the quenching solid density functional theory (QSDFT) method.

In order to reduce the unpleasant taste of flavor-sucking articles such as combustion-type smoking articles, the activated carbon 23 maintains the adsorption performance of activated carbon (hereinafter, also referred to as current charcoal) currently used as an adsorbent for flavor-sucking articles. However, it is desired to specifically adsorb the basic component. Therefore, among the total oxygen-containing functional groups measured by the Boehm method, the activated carbon 23 preferably has the following oxygen-containing functional groups on its surface. That is, the activated carbon 23 contains a carboxyl group (and carboxylic acid anhydride group) (Group I), a lactone-type carboxyl group (and a lactone group) (Group II), a phenolic hydroxyl group (Group III) and a carbonyl group, which are measured by the Boehm method. It preferably has an oxygen-containing functional group consisting of a group or a quinone group (Group IV).

In order for the activated carbon 23 to specifically adsorb the basic component, it is desirable that the amount of total oxygen-containing functional groups is large while maintaining the pore structure of the current carbon, but carboxyl groups (and carboxylic acid anhydride groups) (and carboxylic acid anhydride groups) Since Group I) is strongly acidic, there is a concern that undesired acid-base reactions and catalytic actions may occur in the filter during storage or smoking of burnable smoking articles, resulting in by-products. Therefore, it is particularly preferable that the activated carbon 23 has a weakly acidic oxygen-containing functional group that contributes to the adsorption of basic components.

The amount of the oxygen-containing functional group consisting of a carboxyl group, a lactone-type carboxyl group, a phenolic hydroxyl group and a carbonyl group, which is measured by the Boehm method, is preferably 0.6 mmol / g or more in the activated carbon 23, preferably 0.6 to 0.6 to g. It is more preferably 2.0 mmol / g, and even more preferably 1.0 to 2.0 mmol / g. In the present specification, the amount of oxygen-containing functional groups is represented by the molar amount per 1 g of activated carbon. When the activated carbon 23 contains an oxygen-containing functional group in the above-mentioned amount, it is advantageous in selectively adsorbing and removing a basic component (for example, ammonia) from the fluid sucked by the user at the time of suction by the flavor aspirator. ..

The Boehm method is a known acid-base titration method, and details thereof will be described in Examples described later.

Further, the activated carbon 23 preferably has a total amount of lactone-type carboxyl groups and phenolic hydroxyl groups of 0.3 mmol / g or more, and preferably 0.3 to 2.0 mmol / g, as measured by the Boehm method. More preferably, it is 0.4 to 2.0 mmol / g.

Further, the activated carbon 23 preferably has a carboxyl group amount of 0.12 mmol / g or less, and more preferably 0.01 to 0.12 mmol / g, as measured by the Boehm method.

As will be described later, the activated carbon 23 can be produced by subjecting the raw material activated carbon having a predetermined BET specific surface area to a vapor phase oxidation treatment. The activated charcoal 23 produced in this manner has a large amount of oxygen-containing functional groups on the surface of the activated charcoal, but has a relatively large amount of lactone-type carboxyl groups (Group II) and phenolic hydroxyl groups (Group III) among the oxygen-containing functional groups. It has a characteristic that it has a relatively small amount of a carboxyl group (Group I) among oxygen-containing functional groups.

Activated carbon 23
To obtain activated carbon as a raw material by carbonizing and activating organic materials,
It can be produced by a method including oxidizing the raw material activated carbon by a vapor phase oxidation method.

As the organic material, a known organic material used as a raw material for activated carbon can be used, and for example, a vegetable material can be used. The plant material is, for example, fruit husks such as coconut husks and walnut husks, wood, charcoal, bamboo and the like, typically coconut husks.

First, the above-mentioned organic material is carbonized and activated to obtain a raw material activated carbon. The raw material activated carbon can be produced according to a known method for producing activated carbon. Specifically, the raw material activated carbon, BET specific surface area, preferably 400~1400m ² / g, more preferably produced to an 1000~1400m ² / g. When the BET specific surface area of the raw material activated carbon is within the above range, the produced activated carbon 23 has high adsorption performance and high shape stability.

The raw material activated carbon may be produced by carbonizing the organic material and then activating the carbonized organic material by the gas activation method, or carbonizing the organic material by activating the organic material by the chemical activation method. And activation may be performed at the same time, or the organic material may be activated by a microwave heating method to be carbonized and activated at the same time.

Alternatively, as the raw material activated carbon described above, commercially available activated carbon may be used. In this case, the activated carbon 23 can be produced by a method including oxidizing the raw material activated carbon by a vapor phase oxidation method.

The oxidation treatment by the vapor phase oxidation method can be carried out, for example, by treating the raw material activated carbon in air or steam at a temperature of, for example, 500 ° C. or lower, preferably 300 to 500 ° C. for 1 to 2 hours. .. The oxidation treatment may be carried out by a continuous oxidation treatment or a batch oxidation treatment as described in Examples described later. If the temperature of the oxidation treatment is too high, excessive activation of the raw material activated carbon proceeds and the strength of the activated carbon decreases, which is not preferable.

As described above, the activated carbon 23 is preferably under mild conditions as compared with the conditions of the oxidation treatment by the liquid phase oxidation method, specifically, under the condition that further activation of the raw material activated carbon does not proceed remarkably. , It can be produced by subjecting the raw material activated carbon to vapor phase oxidation treatment.

In a preferred embodiment, the activated carbon 23 is
By carbonizing and activating the organic material, a raw material activated carbon having a BET specific surface area of ^{1000 to 1400 m 2 / g can be obtained.}
The raw material activated carbon can be produced by a method including oxidation treatment in air or steam at a temperature of 500 ° C. or lower, preferably 300 to 500 ° C. for 1 to 2 hours.

Alternatively, when commercially available activated carbon is used as the raw material activated carbon, the activated carbon 23 is preferably a raw material activated carbon having a BET specific surface area of 1000 to ^{1400 m 2 / g in air or steam at 500 ° C. or lower.} Can be produced by a method comprising oxidizing treatment at a temperature of 300 to 500 ° C. for 1 to 2 hours.

The activated carbon 23 can be incorporated into the filter 20 with an addition amount adopted in the conventional charcoal filter. If the filter 20 has a length of 17-31 mm and a circumference of 14.7-25.8 mm, the activated carbon 23 can be incorporated into the filter 20 in an amount of, for example, 20-80 mg per filter.

The portion where the activated carbon 23 is incorporated can be a flow path of a fluid (for example, mainstream smoke, aerosol, air, etc.) sucked by the user at the time of suction of the flavor aspirator. Preferably, the flavor suction article comprises a filter and the activated carbon 23 is incorporated into the filter. More preferably, the flavor-sucking article comprises a flavor source, preferably a tobacco flavor source, and a filter located downstream of the flavor source, with the activated carbon 23 incorporated into the filter.

In the case of the combustion type smoking article 1, the portion where the activated carbon 23 is incorporated is the flow path of the mainstream smoke generated by the combustion of the tobacco flavor source 10a, that is, between the tobacco rod 10 and the end portion on the mouthpiece side of the filter 20. Can be done. Preferably, the activated carbon 23 is incorporated into the filter 20, as shown in FIGS. 1 and 2.

In addition to the activated carbon 23, the flavor aspirator uses known adsorbents such as cellulose particles and cellulose acetate particles, or known flavor modifiers such as flavor capsules containing a fragrance in a film. Further may be included.

In the combustion-type smoking article according to the first embodiment, a hollow portion is formed between the two filter plugs 21 and the activated carbon 23 is arranged in the hollow portion, but a filter is created so as to connect the two filter plugs. The activated carbon 23 can also be arranged so as to be embedded in one of the filter plugs. The activated carbon 23 is preferably incorporated in the filter plug on the upstream side of the two filter plugs. Such a combustion-type smoking article is shown in FIG. 2 as a second embodiment.

FIG. 2 is a cross-sectional view of the combustion type smoking article 1 according to the second embodiment. The combustion-type smoking article 1 shown in FIG. 2 is a cigarette. In FIG. 2, the same components as those in FIG. 1 are designated by the same reference numerals.

The combustion-type smoking article 1 shown in FIG. 2 is
A tobacco rod 10 including a tobacco flavor source 10a and a tobacco wrapping paper 10b that wraps around the tobacco flavor source 10a.
An activated carbon-containing filter plug 24 including a filter medium 21a, an activated carbon 23 embedded in the filter medium 21a, and a plug winding paper 21b wound around the filter medium 21a, and a filter medium 21a and a filter medium connected to the downstream side of the activated carbon-containing filter plug. A filter 20 including a filter plug 21 including a plug winding paper 21b wound around 21a, and a filter 20
The tobacco rod 10 and the chip paper 30 wound on the filter 20 are included so as to connect the tobacco rod 10 and the filter 20.

In the combustion type smoking article 1 shown in FIG. 2, two filter plugs are arranged so as to be connected, but n filter plugs (n is an integer of 2 or more) may be arranged so as to be connected. For example, n is 2 to 4, preferably n is 2 to 3, and more preferably n is 2.

Also in the second embodiment, conventionally known ones can be used as the tobacco rod 10, the components of the filter 20 other than the activated carbon 23, and the chip paper 30. The activated carbon 23 used in the second embodiment is the same as the activated carbon 23 described in the first embodiment.

2. Other Examples of Flavor Suction Articles The cigarette, which is a typical example of the combustion type smoking article, has been described above. However, as described above, the flavor suction article according to the present invention contains a flavor source, and the user can use the flavor derived from the flavor source. Is any suction item that you can taste. Further, as the flavor source, in addition to the tobacco flavor source such as tobacco chopped, a flavor such as menthol, a plant extract or an essential oil can be used.

More specifically, the flavor-sucking article may be a known burning smoking article other than a cigarette, such as a pipe, a kiseru, a cigar, or a cigarette.

Further, as described above, the flavor suction article may be a heated flavor suction article that provides the user with a flavor by heating the flavor source without burning it.

As a heating type flavor aspirator, for example,
A carbon heat source type aspirator that heats a tobacco flavor source with the combustion heat of a carbon heat source to generate an aerosol containing a flavor component (see, for example, International Publication No. 2006/073065);
An electric heating type that includes a suction device body containing a capsule containing a liquid flavor source and a heating device for electrically heating the suction device body, and melts the outer coating of the capsule by electric heating to release a liquid flavor source. Aspirator (see, eg, WO2010 / 110226); or a refillable tobacco pod containing a tobacco flavor source with an aerosol source (propylene glycol or glycerin) and an aspirator body that heats the tobacco pod by electrical heating to generate an aerosol. Electric heating type aspirator equipped with (see, for example, WO2013 / 025921)
Can be mentioned.

Further, as described above, the flavor suction article may be a non-heated flavor suction article that provides the user with the flavor of the flavor source without heating or burning the flavor source. As a non-heated flavor suction article, a refillable cartridge containing a tobacco flavor source is provided in the suction holder, and a non-heated tobacco flavor suction device (for example, a non-heated tobacco flavor suction device) in which the user sucks the tobacco flavor derived from the tobacco flavor source at room temperature. WO2010 / 110226).

3. 3. Effect As described above, the flavor-sucking article contains activated carbon having the following properties (i) and (ii):
(I) BET specific surface area is 1050 m ² / g or more;
(Ii) The G / D ratio is 0.85 or more. As described above, the flavor suction article contains activated carbon that simultaneously satisfies excellent adsorption performance and shape stability. Thanks to the excellent adsorption performance of activated carbon, the flavor-sucking article can provide the user with excellent flavor. In addition, thanks to the shape stability of the activated carbon, the flavor-sucking article uniformly blends the activated carbon for each lot without causing the activated carbon to crush in the manufacturing process, thereby making the flavor of each article uniform. Can be kept.

Further, the flavor suction article preferably contains activated carbon having the following characteristics (iii) in addition to the above characteristics (i) and (ii):
(Iii) The oxygen-containing functional group composed of a carboxyl group, a lactone-type carboxyl group, a phenolic hydroxyl group and a carbonyl group, as measured by the Boehm method, is 0.6 mmol / g or more.

In such a flavor suction article, the basic component can be specifically adsorbed and removed due to the presence of the oxygen-containing functional group while maintaining the adsorption performance of the activated carbon having no oxygen-containing functional group. Can provide even better flavor.

In the conventional activated carbon, as shown in Example 2 described later, when the activation degree of the activated carbon is increased to increase the BET specific surface area, the G / D ratio decreases (the low activated carbon and the current charcoal shown in FIG. 7). And highly activated carbon). As described above, the conventional activated carbon could not achieve both the above-mentioned characteristics (i) and (ii).

4. Preferred Embodiments The preferred embodiments of the present invention are summarized below.
As described above, according to one embodiment, the flavored article has a BET specific surface area of 1050 m ² / g or more and the ratio of the peak intensity of the G band to the peak intensity of the D band in the Raman spectrum (ie, G / D). Includes activated carbon with a specific surface area of 0.85 or higher.

According to a preferred embodiment, in the above embodiment, the flavor-sucking article further comprises a flavor source, preferably a tobacco flavor source.
According to a preferred embodiment, in any one of the above embodiments, the BET specific surface area is a 1050~1600m ² / g, preferably 1150~1600m ² / g, more preferably 1150~1300m ² / g.

According to a preferred embodiment, in any one of the above embodiments, the G / D ratio is 0.85 to 1.1, preferably 0.9 to 1.1.
According to a preferred embodiment, in any one of the above embodiments, the activated carbon has an average particle size of 200 μm to 1000 μm, preferably an average particle size of 300 μm to 700 μm, more preferably 400 μm to 600 μm. ..

According to a preferred embodiment, in any one of the above embodiments, the activated carbon, 0.5 cm ³ / g or more pore volume, pore volume of preferably 0.5~0.8cm ³ / g, more It preferably has a pore volume of 0.52 to 0.74 cm ^{3 / g.}
According to a preferred embodiment, in any one of the above embodiments, the activated carbon, 0.4 cm ³ / g or more micropore volume, micropore volume of preferably 0.4~0.7cm ³ / g, more It preferably has a ^{micropore volume of 0.4-0.6 cm 3} / g.

According to a preferred embodiment, in any one of the above embodiments, the activated charcoal has an amount of an oxygen-containing functional group consisting of a carboxyl group, a lactone-type carboxyl group, a phenolic hydroxyl group and a carbonyl group as measured by the Boehm method. , 0.6 mmol / g or more, preferably 0.6 to 2.0 mmol / g, and more preferably 1.0 to 2.0 mmol / g.

According to a preferred embodiment, in any one of the above embodiments, the activated carbon has a total amount of lactone-type carboxyl groups and phenolic hydroxyl groups measured by the Boehm method of 0.3 mmol / g or more, which is preferable. Is 0.3 to 2.0 mmol / g, more preferably 0.4 to 2.0 mmol / g.

According to a preferred embodiment, in any one of the above embodiments, the activated carbon has a carboxyl group amount of 0.12 mmol / g or less, preferably 0.01 to 0.12 mmol, as measured by the Boehm method. / G.

According to a preferred embodiment, in any one of the above embodiments, the activated carbon is a plant-based activated carbon derived from a plant material.
According to a preferred embodiment, in any one of the above embodiments, the activated carbon is a coconut shell-based activated carbon derived from coconut shell.

According to a preferred embodiment, in any one of the above embodiments, the activated carbon
To obtain activated carbon as a raw material by carbonizing and activating organic materials,
It is produced by a method including oxidizing the raw material activated carbon by a vapor phase oxidation method. In this embodiment, the organic material is preferably a plant material, more preferably fruit shells such as coconut shells and walnut shells, wood, charcoal, or bamboo, and even more preferably coconut shells.

According to a preferred embodiment, in any one of the above embodiments, the activated carbon is produced by a method comprising oxidizing the raw material activated carbon by a vapor phase oxidation method. In this embodiment, the raw material activated carbon is preferably obtained by carbonization and activation of a vegetable material, more preferably fruit husks such as coconut husks and walnut husks, wood, charcoal or bamboo, and even more preferably coconut husks. ..

According to a preferred embodiment, in any one of the above embodiments, the raw material activated carbon, the BET specific surface area of 400~1400m ² / g are preferably has a BET specific surface area of 1000~1400m ² / g.
According to a preferred embodiment, in any one of the above embodiments, the oxidation involves the raw material activated carbon in air or steam at a temperature of 500 ° C. or lower, preferably 300-500 ° C. for 1-2 hours. It is done by processing over.

According to a preferred embodiment, in any one of the above embodiments, the activated carbon
By carbonizing and activating the organic material, a raw material activated carbon having a BET specific surface area of ^{1000 to 1400 m 2 / g can be obtained.}
The raw material activated carbon is produced by a method including oxidation treatment in air or steam at a temperature of 500 ° C. or lower, preferably 300 to 500 ° C. for 1 to 2 hours. In this embodiment, the organic material is preferably a plant material, more preferably fruit shells such as coconut shells and walnut shells, wood, charcoal, or bamboo, and even more preferably coconut shells.

According to a preferred embodiment, in any one of the above embodiments, the activated carbon is ^{a raw material activated carbon having a BET specific surface area of 1000 to 1400 m 2} / g in air or steam at 500 ° C. or lower, preferably 300. Manufactured by a method comprising oxidizing treatment at a temperature of ~ 500 ° C. for 1-2 hours. In this embodiment, the raw material activated carbon is preferably obtained by carbonization and activation of a vegetable material, more preferably fruit husks such as coconut husks and walnut husks, wood, charcoal or bamboo, and even more preferably coconut husks. ..

According to a preferred embodiment, in any one of the above embodiments, the flavor-sucking article comprises a filter and the activated carbon is included in the filter.
According to a preferred embodiment, in any one of the embodiments, the flavor-sucking article comprises a flavor source, preferably a tobacco flavor source, and a filter located downstream of the flavor source, the activated carbon being said filter. Is incorporated into.

According to a preferred embodiment, in any one of the above embodiments, the flavor-sucking article has n (n-1) filter plugs arranged through (n-1) hollow portions. A multi-segment filter is included, and the activated carbon is contained in at least one of the hollow portions. In this embodiment, n is, for example, 2-4, preferably 2-3, more preferably 2.

According to a preferred embodiment, in any one of the above embodiments, the flavor-sucking article comprises a multi-segment filter arranged such that n (n is an integer of 2 or more) filter plugs are connected. Activated carbon is embedded in at least one of the filter plugs. In this embodiment, n is, for example, 2-4, preferably 2-3, more preferably 2.

According to a preferred embodiment, in any one of the above embodiments, the flavor-sucking article is a combustion-type smoking article, preferably a cigarette. In this embodiment, the cigarette preferably comprises a tobacco rod, a filter, the tobacco rod and a chip paper wound on the filter so as to connect the tobacco rod and the filter.

According to a preferred embodiment, in any one of the above embodiments, the flavor-sucking article is a heated flavor-sucking article that provides the user with a flavor by heating the flavor source without burning it.
According to a preferred embodiment, in any one of the above embodiments, the flavor-sucking article is a non-heated flavor-sucking article that provides the user with the flavor of the flavor source without heating or burning the flavor source.

[Example 1] Evaluation of pore structure 1-1. Sample preparation (carbonized carbonization)
The coconut shell activated carbon was crushed and sieved with a 30-60 mesh sieve to prepare carbonized carbon.

(Low activated coal)
As a low activation carbon, coconut shell activated carbon (manufactured by Futamura Chemical Co., Ltd., product name: CW360BL) having an average particle size of 0.34 mm was prepared.

(Weak acid charcoal)
The low-activated coal was subjected to a vapor phase oxidation treatment at a low degree of oxidation as described below to prepare a weakly-activated coal (hereinafter, also referred to as "weak-oxidized coal"). That is, 200 g of low-activated charcoal was put into the rotary kiln and the temperature was raised to 300 ° C. to maintain the same temperature. Air at 30 ° C. humidified to about 90% relative humidity was introduced into the rotary kiln at a flow rate of 24 L / min while being pressurized, and heated for 2 hours while maintaining 300 ° C. Then, the treated activated carbon was taken out and cooled to prepare a weakly oxidized carbon.

(Oxidized charcoal)
The low-activated coal was subjected to vapor phase oxidation treatment at a moderate degree of oxidation as described below to prepare a low-activated coal oxide (hereinafter, also referred to as “oxidized coal”). That is, 200 g of low-activated charcoal was put into the rotary kiln and the temperature was raised to 500 ° C. to maintain the same temperature. Air at 30 ° C., which was humidified to a relative humidity of about 90%, was introduced into the rotary kiln at a flow rate of 24 L / min while being pressurized, and heated for 1 hour while maintaining 500 ° C. Then, the treated activated carbon was taken out and cooled to prepare an oxidized carbon.

(Strong oxide charcoal)
The low-activated coal was subjected to vapor phase oxidation treatment at a high degree of oxidation as described below to prepare a low-activated coal strongly oxidized coal (hereinafter, also referred to as “strongly oxidized coal”). That is, 200 g of low-activated charcoal was put into the rotary kiln and the temperature was raised to 500 ° C. to maintain the same temperature. Air at 30 ° C. humidified to about 90% relative humidity was introduced into the rotary kiln at a flow rate of 24 L / min while being pressurized, and heated for 2 hours while maintaining 500 ° C. Then, the treated activated carbon was taken out and cooled to prepare a strong oxide charcoal.

(Current charcoal)
As the current charcoal, coconut shell activated carbon with an average particle size of 0.34 mm (manufactured by Futamura Chemical Co., Ltd., product name: CW360B was prepared. The current charcoal is a typical example of activated carbon currently used as an adsorbent for combustible smoking articles. Is.

(Oxidized charcoal of current charcoal)
The current coal was subjected to vapor phase oxidation treatment in the same manner as the above-mentioned preparation of the oxidized coal to prepare the current coal oxide.

(Highly activated coal)
Highly activated coal was prepared by subjecting the current coal to activation treatment with a high degree of activation as follows. That is, 200 g of the current charcoal was put into the rotary kiln and the temperature was raised to 900 ° C. to maintain the same temperature. Water was introduced into the rotary kiln at a flow rate of 0.3 mL / min and heated for 20 hours while maintaining 900 ° C. Then, the treated activated carbon was taken out and cooled to prepare highly activated carbon.

1-2. Method The pore structure of the sample prepared as described above was evaluated using nitrogen gas adsorption measurement. Specifically, AutoSorb-1 (manufactured by Quantachrome) was used as a measuring device to evaluate the BET specific surface area, pore volume, micropore volume, and pore distribution.

The details of the experiment are as follows.
As a pretreatment of the sample, vacuum degassing was performed at 300 ° C. for 3 hours at 10 ^{-1 Pa or less.}
To determine the range of the BET plot, see Roqueral et al. The method proposed by

The pore volume was calculated from the amount of nitrogen adsorbed when the _{relative pressure (P / P 0} ) was 0.95 on the nitrogen adsorption isotherm measured at a temperature of 77 K. The pore volume represents the total volume of pores having a pore diameter of about 40 nm or less.

The pore distribution was analyzed based on the quenching solid density functional theory (QSDFT). The "micropore volume" was calculated by performing pore distribution analysis by the QSDFT method from the nitrogen adsorption isotherm.

1-3. Results The results are shown in FIGS. 3 and 4 and Table 1.
FIG. 3 shows the pore distribution curves of carbonized coal, low activated coal, current coal, and highly activated coal. FIG. 4 shows the pore distribution curves of weakly oxidized coal, oxidized coal, strongly oxidized coal, and current coal. Table 1 shows the BET specific surface area, pore volume and micropore volume of each sample.

The following can be seen from the pore distribution curves of FIGS. 3 and 4.
Weakly oxidized coal, oxidized coal, and strongly oxidized coal are coal oxides obtained by subjecting low activated coal to vapor phase oxidation treatment, but these oxidized coals have a pore distribution curve similar to that of low activated coal. Was shown, and the pores of the low-activated coal were maintained without being blocked by the vapor phase oxidation treatment.

In addition, the following can be seen from the detailed numerical data in Table 1:
The BET specific surface areas of the weakly oxidized coal, the oxidized coal, and the strongly oxidized coal were increased as compared with the low activated coal. In addition, the pore volumes of the weakly oxidized coal, the oxidized coal, and the strongly oxidized coal were increased as compared with the low activated coal. The micropore volume of the weakly oxidized coal, the oxidized coal, and the strongly oxidized coal was also increased as compared with the low activated coal.

Similarly, the oxidized coal of the current coal is the oxidized coal obtained by subjecting the current coal to a vapor phase oxidation treatment, but the BET specific surface area of this oxidized coal was increased as compared with the current coal. In addition, both the pore volume and the micropore volume of this oxidized coal were increased as compared with the current coal.

It has been reported that when activated carbon is subjected to liquid phase oxidation treatment, the BET specific surface area of the raw material activated carbon is reduced and the adsorptive capacity is lowered (Japanese Patent Laid-Open No. 2010-193718). In this case, the BET specific surface area, pore volume and micropore volume of the raw material activated carbon were rather increased.

[Example 2] Evaluation of carbon surface structure 2-1. Method The Raman spectrum of the sample prepared in Example 1 was measured by the following method.

As a measuring device, a microlaser Raman Nicolet Almega XR (manufactured by Thermo Fisher Scientific Co., Ltd.) was used. The measurement conditions were as follows.
Laser: 532 nm, 5 mW output Exposure time: 30 seconds, number of exposures: 2 times Grating: 672 lines / mm
Spectrometer aperture: Pinhole peak separation with a diameter of 100 μm was performed using a Voigt function.

The ratio of the peak intensity of the G band to the peak intensity of the D band (G / D ratio) was calculated from the peak intensity of the D band and the peak intensity of the G band in the Raman spectrum.

2-2. Results The measurement results of the Raman spectrum are shown in FIGS. 5 to 7 and Table 2.
FIG. 5 is a graph showing the measurement results of Raman spectra of carbonized coal, low-activated coal, current coal, and high-activated coal. FIG. 6 is a graph showing the measurement results of the Raman spectrum of the low-activated coal, the current coal, the oxidized coal of the low-activated coal, and the oxidized coal of the current coal. FIG. 7 is a graph showing the G / D ratio calculated from the measurement result of the Raman spectrum. Table 2 shows the numerical data of the G / D ratio.

As shown in FIGS. 5 and 7, as the degree of activation progresses (that is, carbonized coal, low activated coal, current coal, and high activated coal in that order), the peak of the D band increases with respect to the peak of the G band, and the peak of the D band increases. The G / D ratio decreased. This indicates that the defects in the carbon structure increase as the degree of activation increases.

As shown in FIGS. 6 and 7, in the oxidized coal of the current coal, the peak of the D band decreased as compared with the current coal, and the value of the G / D ratio increased accordingly. In addition, the peak intensity of the D band of the low activated coal is maintained in all of the weakly oxidized coal, the oxidized coal and the strongly oxidized coal (these are the oxidized coals of the low activated coal), and the G / D ratio of the low activated coal is maintained. The value of was almost maintained. These results suggest that if the carbon structure defects caused by activation are large, the defects are removed by the gas phase oxidation treatment.

From the results of Examples 1 and 2, the following can be considered. Highly activated coal with a high degree of activation has excellent adsorption performance, but has large defects in the carbon structure and is unstable in shape. On the other hand, when vapor phase oxidation treatment is applied to low activated carbon or existing coal, which has a lower activation rate than high activated carbon, the BET specific surface area and pore volume are slightly increased, and defects in the carbon structure are removed. As a result, an activated carbon that simultaneously satisfies excellent adsorption performance and shape stability can be obtained.

[Example 3] Effect of heating of vapor phase oxidation treatment on activated carbon 3-1. Method Regarding the current charcoal prepared in Example 1, the effect of heating in the vapor phase oxidation treatment on the activated carbon was investigated. Specifically, a 6 mg sample was placed in a platinum pan and subjected to thermogravimetric-differential thermal analysis (TG-DTA) under air flow conditions of 200 mL / min. The temperature was raised to 100 ° C. at a rate of 10 ° C./min, maintained at that temperature for a period of 30 minutes or more, and then further raised to 650 ° C. at a rate of 1 ° C./min. As the apparatus, TG / DTA6200 (manufactured by SII Nanotechnology Co., Ltd.) was used.

3-2. Results The results are shown in FIG. FIG. 8 is a graph showing the results of thermogravimetric / differential thermal analysis. FIG. 8 shows the weight change (% by weight) that occurs with the temperature rise.

As shown in FIG. 8, when the current charcoal was heated at a temperature exceeding 500 ° C., a rapid weight loss occurred and activation proceeded. This indicates that when the activated carbon that has already been activated is subjected to additional heat treatment, the activation further proceeds. Therefore, this result indicates that when the activated carbon is subjected to the vapor phase oxidation treatment, it is preferably carried out at a heating temperature of 500 ° C. or lower.

[Example 4] Evaluation of oxygen-containing functional group amount 4-1. Method The amount of oxygen-containing functional groups was measured for the current charcoal, weakly oxidized charcoal, oxidized charcoal, and strongly oxidized charcoal prepared in Example 1.

The oxygen-containing functional group is H.I. P. Quantification was performed according to the quantification method proposed by Boehm (Boehm method). That is, the oxygen-containing functional group was quantified by dividing it into a carboxyl group (Group I), a lactone-type carboxyl group (Group II), a phenolic hydroxyl group (Group III), and a carbonyl group (Group IV).

In the Boehm method, an excess amount of Reaction base (sodium hydrogen carbonate, sodium carbonate, sodium hydroxide, or sodium ethoxide) is reacted with an oxygen-containing functional group, and an excess amount of acid (hydrochloric acid) is added to the base remaining in the reaction. Is added and then neutralized and titrated with a base (sodium hydroxide).

From the neutralization titration of sodium hydrogen carbonate, the amount of oxygen-containing functional groups of Group I is measured. From the neutralization titration of sodium carbonate, the total amount of Group I and Group II is measured. From the neutralization titration of sodium hydroxide, the total amount of Group I, II and III is measured. From the neutralization titration of sodium ethoxide, the total amount of Group I, II, III and IV is measured.

A specific measurement method will be described below.
First, 1.5 g of the sample was placed in 50 mL of 0.05 M Reaction base and shaken for 24 hours under the condition that the shape of the sample was not broken. Then, the sample was filtered through a filter paper, and 10 mL was separated from the filtrate.

When sodium carbonate was used as the reaction base with respect to 10 mL of the filtrate (separated solution), 30 mL of a 0.05 M HCl aqueous solution was added to prepare a reaction mixture. When other bases (sodium hydrogen carbonate, sodium hydroxide, or sodium ethoxide) are used as Reaction base for 10 mL of filtrate (separate solution), add 20 mL of 0.05 M HCl aqueous solution and mix the reaction. The solution was prepared.

Then, the container containing the reaction mixture was covered with PTFE / silicon septum. The N ₂ inlet needle was provided so as to reach below the liquid surface, and the N ₂ Outlet needle was provided so as not to touch the water surface, and nitrogen was circulated at a rate of 1 mL / min or less for 2 hours. As a result, CO ₂ dissolved in the reaction mixture was removed.

Then, nitrogen substitution was performed in advance, and the reaction mixture was transferred to a beaker covered with a parafilm, and one drop of the indicator phenolphthalein / ethanol solution (10 g / L) was added dropwise thereto. Then, the burette was inserted into the beaker with the parafilm lid closed, and the mixture was titrated with a 0.05 M NaOH aqueous solution while stirring with a stirrer.

The number of moles of oxygen-containing functional groups corresponding to each Reaction base can be calculated as follows.
Number of moles = [n (B) / n (HCl) x [B] x V (B)-{[HCl] x V (HCl)-[NaOH] x V (NaOH)}] x V (a) / V (B)
Here, a indicates the Reaction base used for the measurement. a refers to 50 mL of 0.05 M Reaction base in the above experiment. B indicates a separated Reaction base. B refers to 10 mL of filtrate in the above experiment.
[] Indicates the molar concentration used for titration. V indicates titration (volume). n (B) / n (HCl) indicates the valence ratio of Reaction base and hydrochloric acid.

Therefore, if the above-mentioned mol number value is divided by the sample weight, the oxygen-containing functional group amount per sample weight can be obtained, and if the above-mentioned mol number value is divided by the surface area, the oxygen-containing functional group amount per surface area can be obtained. Be done. Blank was also measured for each measurement, and the molar concentrations of other Reaction bases were determined from the molar concentrations of known HCl and NaOH.

4-2. Results The results are shown in FIG. 9 and Table 3. FIG. 9 is a graph showing the measurement results of the amount of oxygen-containing functional groups. Table 3 shows the numerical data of the amount of oxygen-containing functional groups. 9 and 3 show the amount of oxygen-containing functional groups per sample weight.

As shown in FIG. 9 and Table 3, the amount of oxygen-containing functional groups as a whole increased after the vapor phase oxidation treatment in all of the weakly oxidized coal, the oxidized coal, and the strongly oxidized coal. In particular, as the degree of oxidation of the vapor phase oxidation treatment increases (that is, weakly oxidized charcoal, oxidized charcoal, and strongly oxidized charcoal), the increase of lactone-type carboxyl group (Group II) and phenolic hydroxyl group (Group III) is remarkable. Was recognized by. Further, the carboxyl group (Group I) was not increased even if the degree of oxidation in the gas phase oxidation treatment was increased. This is considered to be due to the fact that the carboxyl group (Group I) is eliminated even if it is generated by the vapor phase oxidation treatment, as reported in the Revised Introduction to Carbon Materials (1984) of the Carbon Materials Society.

[Example 5] Evaluation of ammonia adsorption capacity 5-1. Method The adsorption amount of ammonia was measured for the current charcoal, weakly oxidized charcoal, oxidized charcoal, and strongly oxidized charcoal prepared in Example 1, and the adsorption ability of basic components was evaluated.

The adsorption equilibrium was measured at 25 ° C. within a gas pressure range of 2 to 800 mHg using an adsorption equilibrium apparatus Autosorb-1-c (manufactured by Quantachrome). Specifically, as a pretreatment of the sample, vacuum degassing was performed at ^{300 ° C. for 3 hours at 10 -1 Pa or less.} Then, the amount of ammonia adsorbed was measured at 25 ° C. The adsorption amount measured here is the total of the physical adsorption amount and the chemical adsorption amount.

Then, at 25 ° C., vacuum degassing was performed by a turbo molecular pump until the pressure became constant (over 2-3 hours), and the amount of ammonia adsorbed was measured again. The adsorption amount measured here is the physical adsorption amount. The difference between the adsorption amount measured in the first measurement and the adsorption amount measured in the second measurement is the chemical adsorption amount.

5-2. Results The results are shown in FIGS. 10-12. FIG. 10 is a graph showing the amount of ammonia adsorbed (that is, the total amount of physical adsorption and chemical adsorption). FIG. 11 is a graph showing the amount of physical adsorption of ammonia and the amount of chemical adsorption of ammonia. In the adsorption isotherms of FIGS. 10 and 11, the horizontal axis represents the relative pressure (P / P ₀ ), and the vertical axis represents the equilibrium adsorption amount (q). FIG. 12 is a graph showing the adsorption isotherm of FIG. 11 in a DA plot (Dubinin-Astakhov plot).

As shown in FIG. 10, the weakly oxidized coal showed the same level of ammonia adsorption capacity as the current coal, and the oxidized coal and the strongly oxidized coal showed higher ammonia adsorption capacity as compared with the current coal. In FIG. 10, the current charcoal is shown as an example of activated carbon having particularly excellent adsorption performance. Further, as shown in FIG. 11, weak oxide coal, oxidized coal and strong oxide coal mainly adsorb ammonia by physical adsorption, but as shown in FIG. 12, chemical adsorption occurs in a low concentration region of ammonia. Adsorption of ammonia was confirmed.

From the results of Examples 4 and 5, it can be seen that in the weakly oxidized charcoal, the oxidized charcoal, and the strongly oxidized charcoal, the oxygen-containing functional group functions to chemically adsorb basic components such as ammonia. Shown. Since chemical adsorption leads to specific adsorption, weakly oxidized coal, oxidized coal, and strongly oxidized coal can specifically remove basic components such as ammonia.

[Example 6] Evaluation of removal rate of tobacco smoke component 6-1. Preparation of Combustion Type Smoking Articles In this example, the current charcoal, weakly oxidized charcoal, oxidized charcoal, and strongly oxidized charcoal prepared in Example 1 were used as samples. As shown in FIG. 1, a combustion-type smoking article was prepared by incorporating the sample into the space (filter cavity portion) between the two filter plugs, and the removal rate of the tobacco smoke component was evaluated.

Specifically, after inserting a 5 mm acetate filter plug (5.5Y31000, 6% plasticizer) into a paper tube (outer diameter 7.7 mm), add 30 mg of a sample, and further insert a similar acetate filter plug. This made a filter. For the control cigarette, a filter was prepared in which a paper tube (outer diameter 7.7 mm) was filled with two 5 mm acetate filter plugs (5.5Y31000, 6% plasticizer). The obtained filter and a cigarette rod of a commercially available cigarette (Seven Stars: tar 14 mg, nicotine 1.2 mg) were joined to prepare a combustion-type smoking article.

6-2. Method (1) Smoking test Using an automatic smoker (CERULEAN, CERULEANS SM450RH), three same combustion type smoking articles are smoked with a smoke absorption capacity of 17.5 ml / sec, a smoke absorption time of 2 seconds / puff, a smoke absorption frequency of 1 puff / minute, and combustion. Automatically smokes under the condition of 49 mm in length, collects granular substances in tobacco smoke with a Cambridge filter (CM-133, manufactured by Borgwaldt KC Inc.), and smokes that have passed through the Cambridge filter with a refrigerant consisting of dry ice-isopropanol. It was collected in 10 mL of methanol (manufactured by Wako Pure Chemical Industries, Ltd., special grade reagent) cooled to −70 ° C.

The Cambridge filter after the smoking test was shaken in methanol used for collecting smoke components that passed through the Cambridge filter to obtain an analysis sample. 1 μL of the obtained analytical sample was collected in a microsyringe, and the model numbers used for gas chromatograph mass spectrometry (GC-MSD manufactured by Agilent, analysis of particle phase and steam phase were GC: 7890A, MS: 5975C and GC: 6890A, respectively. It was analyzed by MS: 5973). The experiment was repeated 3 times.

Ammonia analysis was performed as described in CORESTA Recommended Method, No. 83, DETERMINATION OF AMMONIA IN MAINSTREAM CIGARETTE SMOKE BY ION CHROMATOGRAPHY May 2017. In the experiment, a combustion-type smoking article was automatically smoked under the conditions of a smoke absorption capacity of 27.5 ml / sec, a smoke absorption time of 2 seconds / puff, a smoke absorption frequency of 1 puff / 30 seconds, and a combustion length of 49 mm, and 0.1 N with two impinger. It was collected in sulfuric acid and analyzed by ion chromatograph.

(2) Calculation of removal rate The removal rate of components in smoke for the control cigarette of each combustion type smoking article was calculated from the following formula.
(I) _A'control = A _control / S, _A'sample = A _sample / S
(II) T = 1- _A'sample / _A'control

Here, A _sample represents a quantitative value of a smoke component obtained from a combustion-type smoking article containing each activated carbon, and A _control is a quantitative value of a smoke component obtained from a control cigarette prepared as a comparison target. Represents.
S represents the quantitative value of the smoke component of the standard cigarette used to calibrate the error due to the work when the smoking test is performed on different dates. For standard cigarettes, quantification of smoke components was performed for each smoking test.

6-3. Results The results are shown in FIGS. 13 and 14. FIG. 13 is a graph showing the reduction rate of ammonia in the mainstream cigarette smoke. FIG. 14 is a graph showing the reduction rate of the vapor component in the mainstream tobacco smoke.

As shown in FIG. 13, when charcoal oxide and strong charcoal oxide were used, the removal of ammonia in the mainstream tobacco smoke was detected. The reduction rate of ammonia in the strong oxide coal is higher than that of the oxide coal, which is considered to be because the strong oxide coal has a larger amount of oxygen-containing functional groups than the oxide coal. In addition, the lactone-type carboxyl group (and lactone group) (Group II) and the phenolic hydroxyl group (Group III) contribute to the adsorption of ammonia, and since they have specific adsorption of ammonia, the carboxyl group (Group I) Is not always necessary.

When weakly oxidized charcoal was used, removal of ammonia in the mainstream cigarette smoke was not detected. This result is considered to be due to the detection accuracy of the detection method of Example 6 because it has been demonstrated in Example 5 that the weakly oxidized coal adsorbs ammonia by both physical adsorption and chemical adsorption. ..

Further, as shown in FIG. 14, when weakly oxidized charcoal, oxidized charcoal, and strongly oxidized charcoal were used, the vapor component in the mainstream cigarette smoke could be sufficiently removed. Although the data of the current charcoal is also shown in FIG. 14, the current charcoal is an activated carbon having particularly excellent adsorption performance. Therefore, in FIG. 14, it can be considered that the weakly oxidized coal, the oxidized coal, and the strongly oxidized coal show a sufficient removal rate even if they show a slightly lower removal rate than the current coal. Furthermore, it was shown that in the oxidized charcoal and the strongly oxidized charcoal, the adsorption rate of basic components such as pyridines and pyrazines is higher than that of the current charcoal, and can be specifically removed. This is because these oxidized coals have almost the same micropore volume as the current coals, so that the target base is formed by the interaction with the introduced surface oxygen-containing functional groups while maintaining the adsorption amount of the current coals. It is shown that the adsorption amount of the sex component is increased.

From the results of FIGS. 13 and 14, the combustion-type smoking article containing any of weakly oxidized charcoal, oxidized charcoal, and strongly oxidized charcoal can sufficiently adsorb and remove the steam component in the mainstream tobacco smoke, and ammonia. It was shown that such basic components can be specifically adsorbed and removed.

Claims (10)

A flavor-sucking article containing activated carbon having a BET specific surface area of 1050 m ² / g or more and a ratio of the peak intensity of the G band to the peak intensity of the D band in the Raman spectrum of 0.85 or more. The flavor suction according to claim 1, wherein the activated charcoal has an amount of an oxygen-containing functional group consisting of a carboxyl group, a lactone-type carboxyl group, a phenolic hydroxyl group and a carbonyl group, which is measured by the Boehm method, of 0.6 mmol / g or more. Goods. The flavor-sucking article according to claim 1 or 2, wherein the activated carbon has ^{a pore volume of 0.5 cm 3 / g or more.} The flavor-sucking article according to any one of claims 1 to 3, wherein the activated carbon has a total amount of lactone-type carboxyl groups and phenolic hydroxyl groups of 0.3 mmol / g or more, which is measured by the Boehm method. The flavor-sucking article according to any one of claims 1 to 4, wherein the activated carbon has a carboxyl group amount of 0.12 mmol / g or less as measured by the Boehm method. The flavor-sucking article according to any one of claims 1 to 5, wherein the activated carbon has a BET specific surface area of 1050 to 1600 m ^{2 / g.} The flavor-sucking article according to any one of claims 1 to 6, wherein the activated carbon is a plant-based activated carbon derived from a plant-based material. The flavor-sucking article according to any one of claims 1 to 7, wherein the activated carbon is a coconut shell-based activated carbon derived from coconut shell. The activated carbon is
To obtain activated carbon as a raw material by carbonizing and activating organic materials,
The flavor-sucking article according to any one of claims 1 to 8, which is produced by a method including oxidizing the raw material activated carbon by a vapor phase oxidation method. The flavor suction article according to any one of claims 1 to 9, wherein the flavor suction article includes a filter, and the activated carbon is contained in the filter.

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