JPH0549862A - Method for deodorization and treating agent therefor - Google Patents

Abstract

PURPOSE:To provide a method for effective deodorization for various malodors from garbage, refregirator, toilet of ordinary life to general manufacturing factories, cattle houses, sewage treating facilities, etc. CONSTITUTION:The method and the treating agent for deodorization of malodors have feature in that the treating agent contains peroxides and one or more metals selected from iron, manganese, cobalt, nickel, chromium, titanium, zirconium, copper, silver, zinc, tin, lead, platinum, palladium, magnesium, calcium, and barium, or their compds. This treating agent is used to treat gases containing malodor such as hydrogen sulfide and ammonia in presence of ozone. Thereby, the ozone deodorization method has excellent deodorizing performance and treating performance for unreacted ozone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for deodorizing a gas containing a malodorous component using ozone, and a treating agent used therefor.

[0002]

BACKGROUND OF THE INVENTION There are various sources of offensive odors, from food waste, refrigerators, toilets, etc. in daily life to general production plants, livestock farms, sewage treatment, etc. Also, there are many places in hospitals, hotels, restaurants, etc. that have a unique odor, if not stinking. Ammonia, mercaptans, sulfides, amines, aldehydes, and the like are attracting attention as causative substances of these malodors or peculiar odors (hereinafter collectively referred to as "malodors"), but they are actually more complicated. , But not limited to these substances. In recent years, as the demand for a technique for removing these malodors has increased, research on the malodor removing technique has become popular, and various methods have been proposed, for example, as follows.

[0003] A masking method for eliminating an offensive odor by emitting an aromatic substance which is stronger than an offensive odor, an adsorption method for adsorbing an offensive odor causing substance by using an activated carbon or other adsorbent, and an acid or alkali neutralizing the offensive odor causing substance. And an acid deodorizing method, in which ozone is added to the odor-causing substance to oxidize and decompose it.

[0004]

However, each of the above-mentioned methods has serious drawbacks. For example, the masking method is not an essential method. The adsorption method has a limited adsorption amount due to the saturated adsorption amount and cannot cope with a strong malodor. Acid and alkali neutralization methods are limited to substances that can be neutralized, and the odors that can be dealt with are limited.

Although the ozone deodorization method does not have the above-mentioned problems, unreacted ozone is not obtained because the odor-causing substance is not sufficiently removed by oxidative decomposition and ozone is extremely harmful even at a low concentration. There is a problem in that it is necessary to remove the gas after the deodorization treatment and exhaust the gas.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have conducted various studies on a treating agent to be subjected to the ozone deodorizing method (hereinafter referred to as “ozone deodorizing catalyst”), and as a result, The following inventions have been reached.

That is, according to the present invention, (1) when deodorizing a gas containing a malodorous component in the presence of ozone, a peroxide and iron, manganese, cobalt, nickel, chromium, titanium, zirconium, copper, silver, zinc , Tin, lead, platinum, palladium, magnesium, calcium, deodorizing method characterized by using an ozone deodorizing catalyst containing one or more of these compounds selected from barium,
(2) The peroxide is barium peroxide, calcium peroxide,
The deodorizing method according to (1) above, which is at least one selected from zinc peroxide, sodium percarbonate, and sodium perborate, and (3) above (1) or (2), wherein the ozone deodorizing catalyst contains activated carbon. The deodorizing method described in (4) for deodorizing a gas containing a malodorous component in the presence of ozone,
Contains peroxide and a metal selected from iron, manganese, cobalt, nickel, chromium, titanium, zirconium, copper, silver, zinc, tin, lead, platinum, palladium, magnesium, calcium, barium, or one or more of these compounds. (5) The ozone deodorizing catalyst according to (4) above, wherein the peroxide is at least one selected from barium peroxide, calcium peroxide, zinc peroxide, sodium percarbonate, and sodium perborate. (6) The ozone deodorizing catalyst according to (4) or (5) above, which contains activated carbon.

The ozone deodorizing catalyst of the present invention is excellent in deodorizing treatment ability for a substance causing an offensive odor and also excellent in unreacted ozone treating ability, and can perform effective deodorization. The present invention will be described in detail below.

The peroxide used in the present invention can be widely selected from hydrogen peroxide, inorganic peroxides and organic peroxides, but preferred are sodium peroxide, calcium peroxide, barium peroxide, Inorganic such as zinc peroxide, sodium percarbonate, sodium perborate, perchloric acid and its salts (sodium salt, etc.), persulfuric acid and its salts (sodium salt, etc.), superphosphoric acid and its salts (potassium salt, etc.) Examples thereof include peroxides, peracetic acid, and organic peracids such as benzoyl peroxide. Particularly preferred peroxides include one or more compounds selected from calcium peroxide, barium peroxide, zinc peroxide, sodium percarbonate and sodium perborate. The proportion of the peroxide in the ozone deodorizing catalyst is arbitrary, but is preferably 0.1 to 90 weight percent, more preferably 1 to 60 weight percent.

The ozone deodorizing catalyst of the present invention comprises iron, manganese, cobalt, nickel, chromium, titanium, zirconium, copper, silver, zinc, tin, lead, platinum, palladium, magnesium and calcium in addition to the above-mentioned peroxides. , A metal selected from barium and one or more of these compounds are contained, whereby the deodorizing treatment ability for the offensive odor-causing substance is improved and the unreacted ozone treatment ability is also improved. Examples of the compound include oxides, hydroxides, carbonates, sulfates and chlorides. The preferred one is
Examples include oxides of iron, manganese, cobalt, copper and the like.
The proportion of these metals or their compounds in the ozone deodorizing catalyst is arbitrary, but is preferably 0.1 to 90 weight percent, more preferably 1 to 60 weight percent.

The ozone deodorizing catalyst of the present invention preferably contains a commonly used porous carrier in order to improve the deodorizing performance. Preferred carriers include silica, alumina, silica-alumina, silica-magnesia, natural zeolite, synthetic zeolite, diatomaceous earth, activated carbon, Kanuma soil, clay minerals and inorganic fibers, but are not particularly limited to these. However, any commonly used carrier can be used.

Among them, activated carbon is particularly preferable. The type of activated carbon is not particularly limited, but the specific surface area is 6
It is preferable to use one having a high specific surface area of 00 m ² / g or more. When activated carbon is used as the carrier, both the ability to treat the offensive odor-causing substance and the ability to treat surplus ozone are improved, and the carrier can be used at a lower temperature. In many cases, the ozone deodorizing catalyst is usually molded and used, and in consideration of practicality such as moldability and hardness, it is more preferable to use the activated carbon as a carrier together with other carriers. The proportion of the carrier in the ozone deodorizing catalyst is arbitrary, but is preferably 1 to 99% by weight, particularly preferably 10 to 90% by weight. When activated carbon is used together with other carriers, the proportion of activated carbon in the carrier is preferably 5 to 90% by weight, particularly preferably 10 to 70% by weight.

The ozone deodorizing catalyst of the present invention is obtained by mixing the respective raw materials, but it is often obtained as a powder depending on the form of the raw materials used, and the powder may be used as it is, but there are restrictions on its use. In some cases, it can be molded into various shapes by a known method, and the shape is not particularly limited. For example, it can be used after being formed into a granular shape, a pellet shape, a honeycomb shape, a plate shape, or a cylindrical shape.
Generally, when the powder is molded into pellets or the like, a binder (binder) is often used to facilitate the molding, but the ozone deodorizing catalyst of the present invention is no exception,
It is possible to mold using a commonly used binder.

Preferred binders include bentonite, colloidal silica, minerals such as white clay, kaolin and water glass, or sodium alginate, glucose, dextrin, hydroxypropyl cellulose, carboxymethyl cellulose sodium salt, and glue, polyvinyl alcohol, polyvinylpyrrolidinone and the like. Examples thereof include organic polymer-based binders, but are not limited to these, and any commonly used binder can be used.

The raw material used in the production of the ozone deodorizing catalyst of the present invention is not particularly limited, and any of the normally available raw materials can be used. Examples of the malodor causing substance (malodor component) to be deodorized by the method of the present invention include, for example, hydrogen sulfide, methyl mercaptan, ammonia, trimethylamine, methyl sulfide, methyl disulfide, acetaldehyde, styrene, propionic acid, normal valeric acid, isokichi Herbate,
Examples thereof include normal butyric acid, formalin, acrolein, acetic acid, methylamine, dimethylamine and the like.

The amount of ozone to be made to coexist with the offensive odor-causing substance is
The amount is preferably 0.1 to 100 times mol, more preferably 0.5 to 10 times mol of the total amount of the malodor causing substance, although it varies depending on the kind and concentration of the bad smell causing substance. It is necessary to sufficiently mix the gas containing the malodorous substance with ozone before the malodorous substance comes into contact with the ozone deodorizing catalyst, and the mixing can be performed by a known method.

A mixed gas of ozone containing a gas containing a substance causing an offensive odor is brought into contact with an ozone deodorizing catalyst, but the temperature at that time is not particularly limited, and for example, a wide temperature range of -10 ° C to 150 ° C is possible. Is. In particular, deodorization and removal of unreacted ozone can be performed even at a low temperature of 0 ° C to 50 ° C.

[0018]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. The ozone removal rate and deodorization rate in the examples were calculated by the following equations. Ozone removal rate (%) = (1-catalyst layer outlet ozone concentration / catalyst layer inlet ozone concentration) × 100 Deodorization rate (%) = (1-catalyst layer outlet malodor causing substance concentration / catalyst layer inlet malodor causing substance concentration) × 100

Example 1 200 g of manganese dioxide, 80% barium peroxide 200%
g, silica aerosil 800 g, and carboxymethyl cellulose sodium salt 100 g as a binder, a small amount of water was added, and the mixture was extruded with a die having a hole diameter of 4 mm by an extrusion molding machine. The extruded udon-shaped ozone deodorizing catalyst was immediately cut into a length of 3 to 10 mm with a cutter and dried at 110 ° C. to obtain a cylindrical ozone deodorizing catalyst. 100 ml of the obtained ozone deodorizing catalyst was filled in a glass reaction tube and kept at 50 ° C.

In a reaction tube filled with the ozone deodorizing catalyst, 3
A gas obtained by adding hydrogen sulfide and ozone to the air humidified through a water seal at 0 ° C. so as to have a concentration of hydrogen sulfide of 30 ppm and ozone of 50 ppm was introduced at a flow rate of 5 liters per minute.
The outlet gas from the ozone deodorizing catalyst layer was introduced into an ozone monitor and an odor-causing substance analyzer (gas chromatograph) to quantify ozone and hydrogen sulfide concentrations. The ozone removal rate and deodorization rate after the continuous operation for 24 hours were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 99%

Example 2 200 g of ferric oxide, 200% of 50% calcium peroxide
g, silica aerosil 100 g, synthetic zeolite 700
g, and 200 g of an acrylic polymer emulsion (containing a solid content of 50%) as a binder, and otherwise the same as in Example 1 to obtain an ozone deodorizing catalyst. A test was conducted in the same manner as in Example 1 using 100 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 98%

Example 3 300 g of silica Aerosil was added to an aqueous solution in which 543 g of cobalt nitrate hexahydrate was dissolved, and the mixture was kept at 50 ° C. for 1 hour. 300 g of powder obtained by spray-drying the solution and calcining in air at 350 ° C. for 6 hours, and further zinc peroxide 2
An ozone deodorizing catalyst was obtained in the same manner as in Example 1, except that 00 g, 700 g of synthetic zeolite, and 400 g of colloidal silica (containing a solid content of about 20%) were used as a binder. A test was conducted in the same manner as in Example 1 using 100 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 99%

Example 4 300 g of silica Aerosil was added to an aqueous solution in which 208 g of lead nitrate was dissolved, and the mixture was kept at 50 ° C. for 1 hour. The solution was spray dried and calcined in air at 350 ° C. for 6 hours to obtain 300 g of powder, 200 g of barium peroxide, 500 g of silica magnesia, and 110 g of polyvinyl alcohol as a binder. Others were the same as in Example 1. To obtain an ozone deodorizing catalyst. A test was conducted in the same manner as in Example 1 using 100 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 100%

Example 5 200 g of alumina aerosil was added to an aqueous solution in which 25.2 g of palladium nitrate was dissolved, evaporated to dryness, and then calcined in air at 350 ° C. for 4 hours and ground to obtain 150 g of powder, and further peroxide. Calcium 200g, silica alumina 700g
Further, 100 g of sodium carboxymethyl cellulose was used as a binder, and the ozone deodorizing catalyst was obtained in the same manner as in Example 1 except for the above. The obtained ozone deodorizing catalyst 1
The test was carried out in the same manner as in Example 1 using 00 ml. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 98%

Example 6 Silica Aerosil 2 was added to an aqueous solution containing 617 g of manganese nitrate tetra-hexahydrate and 455 g of copper nitrate trihydrate.
After adding 50 g, the mixture was kept at 50 ° C. for 1 hour. 450 g of powder obtained by spray-drying the solution and baking in air at 350 ° C. for 6 hours, and 150 g of 50% calcium peroxide,
A columnar ozone deodorizing catalyst was obtained in the same manner as in Example 1 except that 500 g of synthetic zeolite and 100 g of carboxymethyl cellulose sodium salt were used as a binder. A test was conducted in the same manner as in Example 1 using 100 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 100%

Example 7 A glass reaction tube was filled with 100 ml of the ozone deodorizing catalyst used in Example 1 and kept at 50 ° C. Into the reaction tube filled with the ozone deodorizing catalyst, a gas in which ammonia and ozone were added to the air humidified by passing through a water seal at 30 ° C. to a concentration of 20 ppm of ammonia and 70 ppm of ozone was introduced at a flow rate of 4 liters per minute. did. The outlet gas from the ozone deodorizing catalyst layer was subjected to quantitative determination of ozone and ammonia gas concentrations with an ozone monitor and a detector tube. The results after 6 hours of continuous operation were as follows. Ozone removal rate = 100% Ammonia deodorization rate = 93%

Comparative Example 1 In Example 1, 200 g of manganese dioxide was not used,
Cylindrical ozone deodorizing catalyst was obtained in the same manner except that 800 g of silica Aerosil was changed to 1000 g. A test was conducted in the same manner as in Example 1 using 100 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 95%

Comparative Example 2 In order to see the effect of peroxide, a cylindrical ozone deodorizing catalyst was obtained in the same manner as in Example 1 except that barium peroxide was not used. A test was conducted in the same manner as in Example 1 using 100 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 90% Hydrogen sulfide deodorization rate = 85%

Example 8 In order to examine the effect of activated carbon, an ozone deodorizing catalyst was produced in the same manner as in Example 1 except that half of silica aerosil was replaced with activated carbon (specific surface area 960 m ² / g). As a result of the same test as Example 1 using this, 2
Both the ozone removal rate and the hydrogen sulfide deodorization rate after continuous operation for 4 hours were 100%. When the same test was performed by reducing the amount of ozone deodorizing catalyst charged in the reaction tube from 100 ml to 80 ml, both the ozone removal rate and the hydrogen sulfide deodorization rate after continuous operation for 24 hours were 100%.

Example 9 A glass tube was filled with 60 ml of the ozone deodorizing catalyst of Example 8 and the temperature of the ozone deodorizing catalyst was maintained at 30 ° C. 30 ° C
A gas obtained by adding hydrogen sulfide and ozone so that the concentration of hydrogen sulfide of 30 ppm and ozone of 50 ppm was introduced into the humidified air through the water seal was introduced into a glass tube filled with the ozone deodorizing catalyst at a flow rate of 8 liters per minute. The test was conducted. The outlet gas from the ozone deodorizing catalyst layer was introduced into an ozone monitor and an odor-causing substance analyzer (gas chromatograph) to quantify ozone and hydrogen sulfide concentrations. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 98%

Example 10 300 g of silica Aerosil was added to an aqueous solution in which 464 g of manganese nitrate tetra-hexahydrate was dissolved.
I kept it for hours. The solution is spray-dried at 350 ° C for 6
300 g of powder obtained by firing in air for 50 hours, 200 g of 50% calcium peroxide, activated carbon (specific surface area 960 m ² /
g) 800 g, silica magnesia 200 g and carboxymethyl cellulose sodium salt 100 as a binder
A cylindrical ozone deodorizing catalyst was obtained in the same manner as in Example 1 except that g was used. A glass tube was filled with 60 ml of the ozone deodorizing catalyst and kept at 30 ° C. A gas obtained by adding methyl mercaptan and ozone to a concentration of 30 ppm of methyl mercaptan and 60 ppm of ozone in humidified air that has been passed through a water seal at 30 ° C. is supplied to a glass tube filled with the ozone deodorizing catalyst at a flow rate of 8 liters per minute. It was introduced and tested. The outlet gas from the ozone deodorizing catalyst layer was introduced into an ozone monitor and an odor-causing substance analyzer (gas chromatograph) to quantify the concentrations of ozone and methyl mercaptan. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Methyl mercaptan deodorization rate = 99%

Example 11 200 g of nickel oxide, 200% of 50% calcium peroxide
g, activated carbon (specific surface area: 960 m ² / g) 550 g, natural zeolite 250 g, and carboxymethyl cellulose sodium salt 100 g as a binder were used, and a columnar ozone deodorizing catalyst was obtained in the same manner as in Example 1.
A test was conducted in the same manner as in Example 9 using 60 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 95%

Example 12 Silica Aerosil was added to an aqueous solution in which 146 g of silver nitrate was dissolved.
After adding 200 g, the mixture was kept at 50 ° C. for 1 hour. The solution
Spray dry and bake in air at 350 ° C for 6 hours
200 g of the obtained powder, 200 g of zinc peroxide, activated carbon (ratio
Surface area 960m ²/ G) 800 g, synthetic zeolite 20
0 g and carboxymethylcellulose na as a binder
Thorium salt 100 g is used, otherwise the same as in Example 1.
A columnar ozone decomposing agent was obtained. Ozone content obtained
Test as in Example 9 using 60 ml of solvent
Carried out. The results after 24 hours of continuous operation are as follows.
It was. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 99%

Example 13 200 g of silica aerosil was added to an aqueous solution in which 455 g of copper nitrate trihydrate was dissolved, and the mixture was kept at 50 ° C. for 1 hour.
200 g of the powder obtained by spray-drying the solution and calcining in air at 350 ° C. for 6 hours, and sodium perborate 15
A cylindrical ozone deodorizing catalyst was obtained in the same manner as in Example 1, except that 0 g, 700 g of activated carbon (specific surface area 960 m ² / g), 300 g of synthetic zeolite, and 100 g of carboxymethyl cellulose sodium salt as a binder were used. A test was conducted in the same manner as in Example 9 using 60 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 92%

Example 14 300 g of silica aerosil was added to an aqueous solution in which 395 g of chromium nitrate nonahydrate was dissolved, and the mixture was kept at 50 ° C. for 1 hour. 200 g of powder obtained by spray-drying the solution and calcining in air at 350 ° C. for 6 hours, 250 g of 50% calcium peroxide, activated carbon (specific surface area 960 m ² / g) 70
A cylindrical ozone deodorizing catalyst was obtained in the same manner as in Example 1 except that 0 g, 250 g of alumina, and 100 g of carboxymethyl cellulose sodium salt were used as a binder. A test was conducted in the same manner as in Example 9 using 60 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 95%

Example 15 Tin oxide 150 g, zinc peroxide 250 g, activated carbon (specific surface area 960 m ² / g) 600 g, silica-alumina 300
g, silica aerosil 100 g, and carboxymethyl cellulose sodium salt 100 g as a binder were used, and a columnar ozone deodorizing catalyst was obtained in the same manner as in Example 1. A test was conducted in the same manner as in Example 9 using 60 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Methyl mercaptan deodorization rate = 98%

Example 16 80 g of powder obtained by adding 100 g of silica aerosil to an aqueous solution in which 5.3 g of chloroplatinic acid hexahydrate was dissolved, evaporating to dryness, and baking and pulverizing in air at 350 ° C. for 4 hours. And 50% calcium peroxide 100 g, activated carbon (specific surface area 9
A columnar ozone deodorizing catalyst was obtained in the same manner as in Example 1 except that 400 g of 60 m ² / g), 200 g of silica-alumina and 50 g of carboxymethylcellulose sodium salt were used as a binder. Obtained ozone deodorizing catalyst 6
The test was carried out as in Example 9, using 0 ml. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 95%

Example 17 150 g of zinc oxide, 200 g of 80% barium peroxide, 400 g of activated carbon (specific surface area of 960 m ² / g), 300 g of diatomaceous earth, 100 g of silica aerosil and 80 g of carboxymethyl cellulose sodium salt as a binder, and others A cylindrical ozone deodorizing catalyst was obtained in the same manner as in Example 1. A test was conducted in the same manner as in Example 9 using 60 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 96%

Example 18 150 g of calcium carbonate, 150 g of sodium percarbonate,
700 g of activated carbon (specific surface area 960 m ² / g), 300 g of synthetic zeolite, 100 g of silica aerosil and carboxymethyl cellulose sodium salt as a binder 10
A cylindrical ozone deodorizing catalyst was obtained in the same manner as in Example 1 except that 0 g was used. Obtained ozone deodorizing catalyst 60m
The test was carried out as in Example 9 using 1
The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 98%

Example 19 Magnesium oxide 250 g, 80% barium peroxide 15
A cylindrical ozone deodorizing catalyst was obtained in the same manner as in Example 1, except that 0 g, activated carbon (specific surface area 960 m ² / g) 700 g, natural zeolite 300 g, and carboxymethyl cellulose sodium salt 100 g were used as a binder. A test was conducted in the same manner as in Example 9 using 60 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 95%

Example 20 Barium oxide 200 g, 50% calcium peroxide 250
g, activated carbon (specific surface area 960 m ² / g) 600 g, alumina aerosil 250 g, and carboxymethyl cellulose sodium salt 100 g as a binder were used, and a columnar ozone deodorizing catalyst was obtained in the same manner as in Example 1. A test was conducted in the same manner as in Example 9 using 60 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Hydrogen sulfide deodorization rate = 94%

Example 21 150 g of titanium dioxide, 250% of 50% calcium peroxide
g, activated carbon (specific surface area: 960 m ² / g) 400 g, natural zeolite 100 g, and carboxymethyl cellulose sodium salt 70 g as a binder were used, and a columnar ozone deodorizing catalyst was obtained in the same manner as in Example 1. A test was conducted in the same manner as in Example 10 using 60 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Methyl mercaptan deodorization rate = 98%

Example 22 Zirconium oxide 100 g, 50% calcium peroxide 2
00 g, activated carbon (specific surface area 960 m ² / g) 500 g,
A columnar ozone deodorizing catalyst was obtained in the same manner as in Example 1, except that 300 g of silica-alumina and 70 g of sodium salt of carboxymethyl cellulose were used as a binder. A test was conducted in the same manner as in Example 10 using 60 ml of the obtained ozone deodorizing catalyst. The results after 24 hours of continuous operation were as follows. Ozone removal rate = 100% Methyl mercaptan deodorization rate = 97%

[0042]

EFFECT OF THE INVENTION The ozone deodorizing catalyst of the present invention is excellent in deodorizing ability to treat malodor causing substances and also excellent in unreacted ozone treating ability, and the method of the present invention is effective for all malodors from household use to industrial use. Can be deodorized.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical indication location B01J 23/06 A 8017-4G 23/14 A 8017-4G 23/26 A 8017-4G 23/34 A 8017-4G 23/58 A 8017-4G 27/232 A 6750-4G

Claims (6)

[Claims] 1. When a gas containing a malodorous component is deodorized in the presence of ozone, peroxide and iron, manganese, cobalt, nickel, chromium, titanium, zirconium, copper,
Silver, zinc, tin, lead, platinum, palladium, magnesium,
A deodorizing method comprising using a treating agent containing a metal selected from calcium and barium or one or more of these compounds. 2. The deodorizing method according to claim 1, wherein the peroxide is at least one selected from barium peroxide, calcium peroxide, zinc peroxide, sodium percarbonate and sodium perborate. 3. The deodorizing method according to claim 1, wherein the treating agent contains activated carbon. 4. A peroxide and iron, manganese, cobalt, nickel, chromium, titanium, zirconium, copper for deodorizing a gas containing a malodorous component in the presence of ozone.
Silver, zinc, tin, lead, platinum, palladium, magnesium,
A treatment agent containing a metal selected from calcium and barium, or one or more of these compounds. 5. The treating agent according to claim 4, wherein the peroxide is at least one selected from barium peroxide, calcium peroxide, zinc peroxide, sodium percarbonate and sodium perborate. 6. The treating agent according to claim 4 or 5, which contains activated carbon.