JPWO2017010472A1 - Odor reducing agent - Google Patents

Abstract

An agent for decomposing odorous substances in which platinum or a platinum-containing compound is supported on porous silica, wherein the odorous substance is at least one volatile selected from aldehydes, fatty acids, sulfur compounds, and nitrogen compounds. A decomposition agent comprising a compound and used in an atmosphere of 80 to -40 ° C in the presence of oxygen. The present invention is useful in decomposing volatile odorous substances released from fish and meat.

Description

  The present invention relates to an odor substance decomposing agent, a deodorizing agent, a freshness keeping agent, and an article provided with these.

  In recent years, various odorous substances such as sulfur compounds, nitrogen compounds, aldehydes, hydrocarbons, and lower fatty acids have become a problem. For example, when transporting and storing food and drink, odorous substances such as acetaldehyde, methyl mercaptan, and trimethylamine may be generated as the freshness of fish and meat decreases. In order to deodorize these odorous substances, adsorption by activated carbon or oxidative decomposition using a photocatalyst is performed.

  Patent Document 1 discloses an adsorbent for deodorization in a sewage treatment plant, in which bromine, sulfuric acid, and alkali metal halide are uniformly supported on activated carbon.

  In Patent Document 2, a layer containing at least two kinds of photocatalyst particles of titanium oxide and zinc oxide is formed on a base material, and the 50% particle diameter of zinc oxide is larger than the 50% particle diameter of the titanium oxide. An indoor space deodorizing material characterized in that is larger is disclosed.

Japanese Patent No. 3766771 JP 2003-126234 A

  However, in the invention described in Patent Document 1, the adsorptive capacity decreases with time and is difficult to use for a long time. The invention described in Patent Document 2 requires a device for irradiating light, and therefore cannot be easily implemented, and the resolution of odorous substances is not sufficient.

  The subject of the present invention is an odor substance decomposing agent, a decomposing method using the decomposing agent, a deodorizing agent and a deodorizing method using the deodorizing agent, which can be used easily and has an excellent resolution. It is providing the freshness preservation agent of food-drinks, the freshness-keeping method of food-drinks using this freshness-keeping agent, and articles | goods provided with these.

The present invention
[1] An odor substance decomposing agent comprising platinum or a platinum-containing compound supported on porous silica, wherein the odor substance is selected from aldehydes, fatty acids, sulfur compounds, and nitrogen compounds. A decomposing agent used in an atmosphere of 80 to −40 ° C. in the presence of oxygen,
[2] A method of decomposing the odorous substance by bringing the odorous substance and the decomposing agent according to [1] into contact with each other in the presence of oxygen in an atmosphere of 80 to −40 ° C. A decomposition method comprising at least one volatile compound selected from aldehydes, fatty acids, sulfur compounds, and nitrogen compounds;
[3] A deodorant for decomposing odorous substances, comprising platinum or a platinum-containing compound supported on porous silica, wherein the odorous substances are selected from aldehydes, fatty acids, sulfur compounds, and nitrogen compounds. A deodorant, which is used in an atmosphere of 80 to -40 ° C in the presence of oxygen, comprising at least one volatile compound
[4] A method of deodorizing by decomposing the odorous substance by contacting the odorous substance with the deodorant described in [3] in an atmosphere of 80 to −40 ° C. in the presence of oxygen, The deodorizing method, wherein the odor substance contains at least one volatile compound selected from aldehydes, fatty acids, sulfur compounds, and nitrogen compounds,
[5] A freshness-preserving agent for foods and beverages or flower buds that decomposes odorous substances by supporting platinum or a platinum-containing compound on porous silica, wherein the odorous substances are aldehydes, fatty acids, sulfur compounds, and A freshness-preserving agent comprising at least one volatile compound selected from nitrogen compounds and used in an atmosphere of 80 to -40 ° C in the presence of oxygen,
[6] The odorous substance and the freshness-preserving agent according to [5] are brought into contact with each other in the presence of oxygen in an atmosphere of 80 to -40 ° C to decompose the odorous substance and maintain the freshness of the food or drink or the floret. A method for maintaining freshness, wherein the odor substance includes at least one volatile compound selected from aldehydes, fatty acids, sulfur compounds, and nitrogen compounds, and
[7] An article comprising the decomposing agent according to [1], the deodorizing agent according to [3], or the freshness maintaining agent according to [5].

  According to the present invention, an odorous substance decomposing agent that can be used easily and has an excellent resolution, a decomposing method using the decomposing agent, a deodorizing agent, and a deodorizing method using the deodorizing agent, A freshness-preserving agent for foods and beverages, a method for keeping freshness of foods and beverages using the freshness-keeping agent, and articles equipped with these can be provided.

  As a deodorizing method other than adsorption by activated carbon or the like and oxidative decomposition using a photocatalyst, a catalytic combustion method using a platinum catalyst or the like can be mentioned. It is known that specific odorous substances (for example, volatile organic compounds such as acetaldehyde, methyl mercaptan, and trimethylamine) can be oxidatively decomposed at a high temperature of 150 to 350 ° C. by this method. However, a technique for decomposing these at a low temperature using a platinum catalyst or the like is not known.

  However, when the above-mentioned problem solution was examined, when a specific odor substance was brought into contact with a porous silica carrying platinum or a platinum-containing compound, surprisingly, a temperature of less than 150 ° C. (for example, It has been newly found that these odorous substances can be decomposed even at room temperature or at a low temperature such as −40 ° C.

  The inventors of the present invention have made extensive studies based on such knowledge and have completed the present invention.

  As one embodiment of the present invention, a decomposing agent for odorous substances can be given. This decomposing agent is formed by supporting platinum or a platinum-containing compound on porous silica.

  As one embodiment of the present invention, a method of decomposing an odorous substance by bringing a odorous substance into contact with a decomposing agent obtained by supporting platinum or a platinum-containing compound on porous silica can be mentioned. Thereby, an odor substance can be removed.

  This decomposing agent and decomposing method can be used in various applications where it is beneficial to decompose odorous substances.

  As one embodiment of the present invention, a deodorant that decomposes odorous substances can be given. This deodorant is obtained by supporting platinum or a platinum-containing compound on porous silica.

  As one embodiment of the present invention, there is a method in which an odor substance is contacted with a deodorant obtained by supporting platinum or a platinum-containing compound on porous silica to decompose and deodorize the odor substance. Thereby, an odor substance can be removed.

  The deodorant and the deodorizing method are not particularly limited. For example, odorous substances generated during transportation and storage of food and drink, odorous substances generated from garbage, odorous substances generated from factories, animal remains Deodorize by decomposing odorous substances generated from

  As one embodiment of the present invention, a freshness-preserving agent such as a food or drink that decomposes odorous substances can be given. This freshness-keeping agent is obtained by supporting platinum or a platinum-containing compound on porous silica.

  As one embodiment of the present invention, a method for maintaining the freshness of a food or drink or a flower bud by decomposing the odorous substance by bringing the odorous substance into contact with a freshness-keeping agent formed by supporting platinum or a platinum-containing compound on porous silica. Is mentioned. This also removes odorous substances.

  The freshness-keeping agent and the freshness-keeping method are not particularly limited. For example, the freshness can be maintained by decomposing odorous substances generated during transportation and storage of food and drink or florets. In addition, food / beverage products refer to what contains both a drink and solid food.

  As one embodiment of the present invention, an article including these decomposing agent, deodorant, and freshness-keeping agent (hereinafter, also referred to as “decomposing agent or the like”) can be given.

  Although it does not specifically limit as this article | item, For example, a bag, a container, a filter, a refrigerator, a freezer, a container, an air conditioner, a vehicle, a ship, an aircraft etc. are mentioned.

  For example, in the case of a refrigerator or freezer, odorous substances such as methyl mercaptan and trimethylamine are generated from fish and meat (stored objects) stored in the refrigerator, and these cause odor in the refrigerator. If the refrigerator and freezer of this aspect are used, the odor substance generated from the material to be stored in the warehouse is decomposed, so that the odor can be reduced.

  In addition, if the surface of the object to be preserved is made weakly acidic by, for example, causing carbon dioxide gas generated during the decomposition of odorous substances to the object to be preserved, it can suppress the action of enzymes that degrade proteins and increase the number of bacteria. The freshness can be maintained by suppressing. However, if some odorous substance remains around the object to be preserved, the action of carbon dioxide gas on the object to be preserved is inhibited by the odorous substance, making it difficult to maintain freshness. If the refrigerator or freezer of this aspect is used, since the resolution of the odorous substance is high, there is little inhibition by the odorous substance, and the freshness of the stored object can be suitably maintained.

  Each of the above embodiments is used in an atmosphere of 80 to -40 ° C in the presence of oxygen. For example, it may be used at 15 to 0 ° C. in the case of a refrigerator and −5 to −25 ° C. in the case of a freezer.

  Hereafter, each element in each said aspect is demonstrated.

  The odor substance includes at least one volatile compound selected from aldehydes, fatty acids, sulfur compounds, and nitrogen compounds.

  The aldehyde is not particularly limited as long as it is a compound having an aldehyde group, and examples include formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, crotonaldehyde, hexanal, nonenal and the like.

  Fatty acids are not particularly limited as long as they are chain-like organic acids having a carboxy group, and examples include formic acid, acetic acid, propionic acid, butyric acid, valeric acid, and caproic acid.

  Examples of the sulfur compound include methyl mercaptan and mercaptoethanol.

  Examples of the nitrogen compound include trimethylamine, triethylamine, ethylamine, ethylenediamine, and ammonia.

  In this specification, the porous silica means a substance mainly composed of silicon oxide having a porous structure.

  The average pore diameter of the porous silica is preferably 0.5 nm or more from the viewpoint of promoting the progress of the decomposition reaction, and preferably 15 nm or less from the viewpoint of supporting platinum in the form of particles. From these viewpoints, the average pore diameter of the porous silica is preferably 0.5 to 15 nm, more preferably 0.5 to 10 nm, still more preferably 0.5 to 7 nm, still more preferably 0.5 to 5 nm. is there. The average pore diameter of the porous silica in this specification can be calculated by the NL-DFT method by nitrogen adsorption / desorption.

The specific surface area of the porous silica is preferably 300 m ² / g or more from the viewpoint of increasing the supported amount of platinum, and preferably 2000 m ² / g or less from the viewpoint of realizing the production. From these viewpoints, the specific surface area of the porous silica is preferably 300 to 2000 m ² / g, more preferably 600 to 1500 m ² / g. The specific surface area of the porous silica in this specification can be calculated by the BET method based on nitrogen adsorption / desorption.

  Furthermore, the porous silica preferably has at least one peak at a position where the d-spacing of X-ray diffraction is larger than 2.0 nm. The X-ray diffraction peak means that there is a periodic structure having a d value corresponding to the peak angle in the sample. Therefore, the presence of one or more peaks at the diffraction angle corresponding to a d value of 2.0 nm or more means that the pores are regularly arranged at intervals of 2.0 nm or more. Such porous silica having regularly arranged pores is also referred to as mesoporous silica in the present specification. The d interval is preferably 2.0 to 25 nm, more preferably 3.0 to 20 nm. The X-ray diffraction pattern of porous silica can be measured by a powder X-ray diffractometer.

  Although it does not specifically limit as a manufacturing method of porous silica, For example, it can manufacture as follows. First, an inorganic raw material and an organic raw material are mixed and reacted to form an organic matter-inorganic matter composite in which an inorganic matter skeleton is formed around the organic matter as a template. Subsequently, porous silica is obtained by removing organic substances from the obtained composite.

As the inorganic material, tetramethoxysilane, tetraethoxysilane, alkoxysilane, such as tetra propoxy silane, sodium silicate, kanemite _{(kanemite, NaHSi 2 O 5 ·} 3H 2 O), silica, silica - like metal composite oxide and the like It is done. These inorganic raw materials form a silicate skeleton. These can be used alone or in admixture of two or more.

  Although the organic raw material used as a casting_mold | template is not specifically limited, For example, surfactant etc. are mentioned. The surfactant may be any of cationic, anionic, and nonionic, specifically, alkyltrimethylammonium (preferably alkyltrimethylammonium having an alkyl group having 8 to 18 carbon atoms). , Alkylammonium, dialkyldimethylammonium, benzylammonium chloride, bromide, iodide or hydroxide, fatty acid salt, alkylsulfonate, alkylphosphate, polyethylene oxide nonionic surfactant, primary alkyl Examples include amines, triblock copolymer type polyalkylene oxides, glycerin fatty acid esters, and polyglycerin fatty acid esters. These can be used alone or in admixture of two or more.

  When mixing an inorganic raw material and an organic raw material, a suitable solvent can be used. Although it does not specifically limit as a solvent, For example, water, an organic solvent, the mixture of water and an organic solvent, etc. are mentioned.

  The formation method of the complex of the inorganic substance and the organic substance is not particularly limited. For example, after dissolving the organic raw material in a solvent, adding the inorganic raw material and adjusting to a predetermined pH, the reaction mixture is then heated to a predetermined temperature. And a method in which the condensation polymerization reaction is carried out. The reaction temperature of the polycondensation reaction varies depending on the type and concentration of the organic raw material and inorganic raw material used, but is preferably about 0 to 100 ° C, more preferably 35 to 80 ° C.

  The reaction time for the condensation polymerization reaction is not particularly limited, but is preferably 1 to 24 hours. In addition, the above condensation polymerization reaction may be performed either in a stationary state or in a stirring state, or may be performed in combination.

  By removing the organic raw material from the composite obtained after the polycondensation reaction, porous silica can be obtained. The removal of the organic substance from the complex of the organic substance and the inorganic substance can be performed by a method such as a method of baking at 400 to 800 ° C. or a method of treating with a solvent such as water or alcohol.

  The porous silica is preferably mesoporous silica in which pores are regularly arranged from the viewpoint of pore volume. For example, mesoporous silica is obtained by dispersing sodium silicate in an aqueous solution containing a surfactant, adding hydrochloric acid while heating and stirring to adjust the pH of the dispersion, and washing and drying the obtained solid product. It is obtained by firing at about 400 to 800 ° C.

  Examples of the platinum-containing compound supported on the porous silica include platinum chloride, platinum oxide, platinum hydroxide, chloroplatinate, and alloys with other metals.

  From the viewpoint of catalytic activity, the particles of platinum or platinum-containing compounds supported on porous silica are preferably 0.5 to 7 nm, more preferably 1 to 4 nm.

  The content of platinum or a platinum-containing compound in the decomposing agent or the like is preferably 0.1% by mass or more from the viewpoint of catalytic activity, and preferably 5% by mass or less from the viewpoint of production cost. From these viewpoints, the content of platinum or the platinum-containing compound is preferably 0.1 to 5% by mass, more preferably 0.1 to 3% by mass, and further preferably 0.1 to 2% by mass in the decomposition agent or the like. It is.

  A decomposition agent or the like in which platinum or a platinum-containing compound is supported on porous silica can be obtained, for example, by reducing a mixture of a platinum raw material such as a platinum compound or platinum complex containing a platinum atom and porous silica. Specifically, for example, an aqueous solution containing a platinum raw material is prepared, impregnated with porous silica, dried, and then reduced to obtain a decomposition agent in which platinum or a platinum-containing compound is supported on porous silica. Can do.

  Examples of the platinum raw material include chloroplatinic acid, dinitrodiammine platinum, and tetraammineplatinum nitrate.

  The temperature condition for drying the porous silica impregnated in the aqueous solution containing the platinum raw material is not particularly limited, but is preferably about 50 to 200 ° C.

  As a reduction method, a method of treating with a reducing agent, heat, light, or the like can be used, and conditions for generating platinum particles by decomposition of the platinum raw material are appropriately set. Since excessive treatment may increase the particle diameter due to sintering of the generated platinum particles, it is necessary to set appropriate conditions.

  For example, when chloroplatinic acid is used, it is preferable to use hydrogen as a reducing agent and to perform the treatment under a temperature condition of 100 to 400 ° C.

  Platinum or platinum-containing compounds are preferably supported in the pores rather than outside the pores of the porous silica because the catalytic activity decreases when these become coarse particles due to particle growth. Platinum or platinum particles supported (attached) outside the pores can be removed by washing with running water or the like.

  According to the decomposition agent of each aspect described above, the decomposition of odorous substances by a conventional metal catalyst is performed at a high temperature of 150 ° C. or higher, while the technical common knowledge of those skilled in the art is that the room temperature and freezing point are adjusted. The odorous substance can be decomposed even in a temperature range below.

Preparation of decomposition agents Examples 1 and 2
1.0 g of the carrier shown in Table 1 was suspended in 50 mL of water, and an aqueous chloroplatinic acid solution [H ₂ PtCl ₆ aq. The solution was stirred overnight at room temperature. The solvent is distilled off by heating to 50 ° C. using an evaporator, and the obtained powder is vacuum-dried at 60 ° C. for 16 to 18 hours, and hydrogen gas is circulated at 30 mL / min for 2 hours at 150 ° C. By performing the reduction treatment, a decomposition agent having platinum supported on a carrier was obtained.

Preparation of Decomposing Agent Example 3
1.0 g of the carrier shown in Table 1 is suspended in 50 mL of water, and a dinitrodiammineplatinum nitrate aqueous solution [(NO ₂ ) ₂ (NH ₃ ) ₂ Pt · HNO ₃ aq so that the supported amount of Pt is 1.0 mass%. . The solution was stirred overnight at room temperature. The solvent is distilled off by heating to 50 ° C. using an evaporator, and the obtained powder is vacuum-dried at 60 ° C. for 16 to 18 hours, and hydrogen gas is circulated at 30 mL / min for 2 hours at 300 ° C. By performing the reduction treatment, a decomposition agent having platinum supported on a carrier was obtained.

Preparation of decomposition agent Comparative Example 1
The carrier as shown in Table 1 was used as the decomposition agent without supporting Pt.

The specific surface area (S _BET ) and total pore volume (V _tot ) of the carriers used in Examples 1 to 3 and Comparative Example 1 were measured by the BET method using the adsorption isotherm obtained from the nitrogen adsorption / desorption measurement. -Average pore diameter (D _meso ) was obtained by DFT method. The results are shown in Table 1.

  Further, when powder X-ray diffraction was performed on each carrier, the carrier used in Examples 1 and Comparative Example 1 was 9.4 nm, 5.8 nm, and 4.9 nm. The carriers used in Examples 2 and 3 had peaks at 4.9 nm, 2.9 nm, 2.5 nm, and 1.9 nm, respectively.

In addition, powder X-ray diffraction and nitrogen adsorption / desorption measurement were performed on the decomposition agents obtained in Examples 1 to 3, respectively. The Pt particle diameter (crystallite diameter, D _Pt ) was calculated from the diffraction peak obtained by powder X-ray diffraction using the Scherrer equation. Similarly to the support, the specific surface area (S _BET ) and the total pore volume (V _tot ) were determined by the BET method using the adsorption isotherm obtained from the nitrogen adsorption / desorption measurement, and the average pore diameter was determined by the NL-DFT method. (D _meso ) was obtained. The results are shown in Table 1.

  Except for Comparative Example 1, none of the decomposition agents showed any significant changes in structural characteristics before and after platinum loading. Moreover, the diffraction peak derived from platinum was observed from the XRD pattern from any of the decomposition agents.

Test Example 1 Aldehyde Decomposition Test The following aldehyde decomposition test was performed using the decomposing agents obtained in Examples 1 to 3. “Odor bag” (bag capacity: 3 L, containing 2.5 L of reaction gas (acetaldehyde concentration, about 100 ppm; oxygen, 20% by volume; nitrogen, balance: balance gas) containing aldehyde (acetaldehyde) in the amount shown in Table 2 Bag size: 250 × 250 mm, Material: Polyester film / manufactured by ASONE Co., Ltd.) 500 mg of decomposing agent was introduced and allowed to stand at 4 ° C. for 21 hours. (Measured by Gastec Co., Ltd.). The results are shown in Table 2.

Test Example 2 Ammonia decomposition test The following ammonia decomposition test was performed using the decomposition agents obtained in Examples 1 to 3. “Smell bag” (bag capacity: 3 L, bag size :) containing 2.5 L of a reaction gas (ammonia concentration, about 65 ppm; oxygen, 20 vol%; nitrogen, balance: balance gas) containing ammonia in the amount shown in Table 2 250 × 250 mm, material: polyester film / manufactured by ASONE Corporation), 500 mg of decomposing agent is added and left at 4 ° C. for 21 hours. Measured with The results are shown in Table 2.

Test Example 3 Trimethylamine degradation test The following trimethylamine degradation test was performed using the degradation agents obtained in Examples 1 to 3. “Smell bag” (bag capacity: 3 L, bag size: 2.5 L) containing 2.5 L of reaction gas (trimethylamine concentration, about 3 ppm; oxygen, 20% by volume; nitrogen, balance: balance gas) containing the amount of trimethylamine described in Table 2 250 × 250 mm, material: polyester film / manufactured by ASONE Corporation), 500 mg of decomposing agent is added and left at 4 ° C. for 21 hours. Measured with The results are shown in Table 2.

Test Example 4 Methyl mercaptan degradation test The following methyl mercaptan degradation test was conducted using the degradation agents obtained in Examples 1 to 3. “Odor bag” (bag capacity: 3 L) containing 2.5 L of reaction gas containing methyl mercaptan in the amount shown in Table 2 (methyl mercaptan concentration, about 1.5 ppm; oxygen, 20 vol%; nitrogen, balance: balance gas) , Bag size: 250 × 250 mm, material: polyester film / manufactured by ASONE Co., Ltd.), 500 mg of decomposing agent was added and left at 4 ° C. for 21 hours. (Measured by Gastech). The results are shown in Table 2.

Test Example 5 Ammonia decomposition test (room temperature)
The following ammonia decomposition tests were conducted using the decomposition agents obtained in Examples 1 and 2. “Smell bag” (bag capacity: 3 L, bag size: 250 ×) containing 2 L of reaction gas (ammonia concentration, about 50 ppm; oxygen, 20 vol%; helium, balance: balance gas) containing ammonia in the amount shown in Table 2 250 mm, material: polyester film / manufactured by ASONE Corporation), 500 mg of decomposition agent was added and allowed to stand at 25 ° C. for 21 hours. It was measured. The results are shown in Table 2.

Test Example 6 Methyl mercaptan degradation test (room temperature)
Using the decomposition agents obtained in Examples 1 and 2 and Comparative Example 1, the following methyl mercaptan decomposition test was performed. “Smell bag” containing 2 L of a reaction gas (methyl mercaptan concentration, about 15 ppm; oxygen, 20% by volume; helium, balance: balance gas) containing methyl mercaptan in the amount shown in Table 2 (bag capacity: 3 L, bag size: 400 × 250 mm, material: Polyester film / manufactured by ASONE Corporation), 400 mg of decomposing agent was added and left at 25 ° C. for 21 hours. ). The results are shown in Table 2.

Test Example 7 Fatty acid degradation test (room temperature)
The following fatty acid decomposition tests were performed using the decomposition agents obtained in Examples 1 to 3. “Odor bag” (bag capacity: 3 L, containing 2.5 L of reaction gas (acetic acid concentration, about 50 ppm; oxygen, 20 vol%; nitrogen, balance: balance gas) containing fatty acid (acetic acid) in the amount shown in Table 2 Bag size: 250 × 250 mm, Material: Polyester film / manufactured by ASONE Co., Ltd.), 500 mg of decomposition agent was added and left at 25 ° C. for 21 hours. (Measured by Gastec Co., Ltd.). The results are shown in Table 2.

Test Example 8 Aldehyde degradation test (room temperature)
The following aldehyde decomposition tests were conducted using the decomposition agents obtained in Examples 1 to 3 and Comparative Example 1. “Smell bag” (bag capacity: 3 L, containing 2.5 L of reaction gas (formaldehyde concentration, about 100 ppm; oxygen, 20% by volume; nitrogen, balance: balance gas) containing the amount of aldehyde (formaldehyde) shown in Table 2 Bag size: 250 × 250 mm, Material: Polyester film / manufactured by ASONE Co., Ltd.), 500 mg of decomposing agent was added and left at 25 ° C. for 21 hours. (Measured by Gastec Co., Ltd.). The results are shown in Table 2. Further, the amount of carbon dioxide generated in the head space in the odor bag after standing at 25 ° C. for 21 hours was measured with a gas detector tube (manufactured by Gastec Co., Ltd.). The results are shown in Table 3.

Test Example 9 Aldehyde degradation test (−20 ° C.)
The following aldehyde decomposition test was performed using the decomposition agent obtained in Example 2. “Odor bag” (bag capacity: 3 L, containing 2.5 L of reaction gas (acetaldehyde concentration, about 50 ppm; oxygen, 20% by volume; nitrogen, balance: balance gas) containing aldehyde (acetaldehyde) in the amount shown in Table 2 Bag size: 250 × 250 mm, Material: Polyester film / manufactured by AS ONE Co., Ltd.) 500 mg of decomposing agent is added and left at −20 ° C. for 21 hours. After transporting and returning to room temperature, the aldehyde (acetaldehyde) concentration was measured with a gas detector tube (manufactured by Gastec Co., Ltd.). The results are shown in Table 2.

  From Examples 1 to 3, it can be seen that odorous substances can be decomposed when platinum or a platinum-containing compound is supported on porous silica. On the other hand, in Comparative Example 1 in which platinum or a platinum-containing compound is not supported on porous silica, it can be seen from Table 3 that there is no resolution of odorous substances. In Test Example 8 of Table 2, although the formaldehyde residual concentration in Comparative Example 1 is lower than the initial concentration, it is presumed to be due to adsorption.

  The present invention is not limited in any way by the above-described embodiments and examples. Various embodiments can be taken without departing from the scope of the present invention.

  The present invention is useful in decomposing volatile odorous substances released from fish and meat.

Claims (14)

  A decomposing agent for an odorous substance comprising platinum or a platinum-containing compound supported on porous silica, wherein the odorous substance is at least one volatile selected from aldehydes, fatty acids, sulfur compounds, and nitrogen compounds. A decomposition agent comprising a compound and used in an atmosphere of 80 to -40 ° C in the presence of oxygen. The porous silica has an average pore diameter of 1 to 15 nm, a specific surface area of 300 to 2000 m ² / g, and at least one peak at a position where the d-spacing of X-ray diffraction is larger than 2.0 nm. The decomposition agent according to claim 1.   The platinum content is 0.1 to 5% by mass, and the platinum or platinum-containing compound supported on the porous silica is in the form of particles having a particle size of 0.5 to 7 nm. Decomposing agent.   A method for decomposing the odorous substance by contacting the odorous substance with the decomposing agent according to any one of claims 1 to 3 in an atmosphere of 80 to -40 ° C in the presence of oxygen, wherein the odorous substance is A decomposition method comprising at least one volatile compound selected from aldehydes, fatty acids, sulfur compounds, and nitrogen compounds.   A deodorant for decomposing odorous substances, comprising platinum or a platinum-containing compound supported on porous silica, wherein the odorous substances are selected from aldehydes, fatty acids, sulfur compounds, and nitrogen compounds. A deodorant containing a volatile compound of a kind and used in an atmosphere of 80 to -40 ° C in the presence of oxygen. The porous silica has an average pore diameter of 1 to 15 nm, a specific surface area of 300 to 2000 m ² / g, and at least one peak at a position where the d-spacing of X-ray diffraction is larger than 2.0 nm. The deodorizer according to claim 5.   The platinum content is 0.1 to 5% by mass, and the platinum or platinum-containing compound supported on the porous silica is in the form of particles having a particle size of 0.5 to 7 nm. Deodorants.   A method for deodorizing by decomposing the odorous substance by contacting the odorous substance with the deodorant according to any one of claims 5 to 7 in an atmosphere of 80 to -40 ° C in the presence of oxygen. The deodorizing method, wherein the odor substance contains at least one volatile compound selected from aldehydes, fatty acids, sulfur compounds, and nitrogen compounds.   It is a freshness-preserving agent for foods and beverages or flower buds that decomposes odorous substances by supporting platinum or platinum-containing compounds on porous silica, and the odorous substances are from aldehydes, fatty acids, sulfur compounds, and nitrogen compounds. A freshness-keeping agent comprising at least one selected volatile compound and used in an atmosphere of 80 to -40 ° C in the presence of oxygen. The porous silica has an average pore diameter of 1 to 15 nm, a specific surface area of 300 to 2000 m ² / g, and at least one peak at a position where the d-spacing of X-ray diffraction is larger than 2.0 nm. The freshness-keeping agent according to claim 9.   The platinum content is 0.1 to 5% by mass, and the platinum or platinum-containing compound supported on the porous silica is in the form of particles having a particle size of 0.5 to 7 nm. Freshness-keeping agent.   An odorous substance and the freshness-keeping agent according to any one of claims 9 to 11 are contacted in an atmosphere of 80 to -40 ° C in the presence of oxygen to decompose the odorous substance, thereby improving the freshness of a food or drink or a flower bud. A method for maintaining freshness, wherein the odor substance includes at least one volatile compound selected from aldehydes, fatty acids, sulfur compounds, and nitrogen compounds.   An article comprising the decomposition agent according to any one of claims 1 to 3, the deodorant according to any one of claims 5 to 7, or the freshness-keeping agent according to any one of claims 9 to 11.   14. The article of claim 13, which is a bag, container, filter, refrigerator, freezer, container, air conditioner, vehicle, ship or aircraft.