KR100643576B1 - Manufacturing of Low-Temperature catalysts for treating hazardous gases in the atmosphere - Google Patents

Abstract

The present invention relates to a method for preparing a room temperature catalyst for removing odorous substances present in the gas phase. The present invention comprises the steps of preparing an inorganic compound carrier selected from the group consisting of activated carbon, alumina, silica and zeolite or mixtures thereof; Preparing an aqueous catalyst precursor solution comprising a manganese compound present in the form of a nitriding or sulfiding compound and at least one second metal compound selected from the group consisting of copper, silver, cobalt and nickel; Supporting the inorganic compound carrier in the aqueous catalyst precursor solution; And at least one material selected from the group consisting of hydrazine, sodium borohydride, hydrogen gas, hydrogen iodide, carbon sulfoxide dioxide phosphorus acid, and a reducing agent consisting of phosphate metal sodium, potassium, and aluminum. It provides a method for producing a room temperature catalyst for removing odorous substances in the gas phase comprising the step of.

Activated carbon, alumina, silica, zeolite, metal oxide, reducing agent

Description

Manufacturing method of room temperature catalyst for removing odorous substance in gas phase {Manufacturing of Low-Temperature catalysts for treating hazardous gases in the atmosphere}

The present invention relates to a method for preparing a room temperature catalyst for removing odorous substances present in the gas phase. The decomposition and removal of odorous substances, particularly aldehydes, ammonia, acetic acid, hydrogen sulfide, trimethylamine and methyl mercaptan, which are included in the gas phase As an excellent catalyst, it is characterized by particularly excellent decomposition and removal properties at low temperatures. In more detail, one or more metal components of manganese, copper, silver, cobalt, and nickel compounds on a carrier such as activated carbon, alumina, silica, and zeolite may be used to reduce the particles of the reduced metal, thereby exhibiting high activity. It is characterized in that a catalyst is prepared and used to decompose and remove odorous substances in the gas phase by oxidation.

As a method for reducing such odorous substances, techniques such as high temperature oxidation, adsorption and absorption, photocatalyst, biological treatment, and plasma have been used. In particular, techniques such as adsorption, high temperature oxidation, and photocatalyst have been widely used in recent years. Among these techniques, the adsorption method using activated carbon or zeolite is widely used for low concentration gas component treatment. The adsorbent used in the adsorption method has a short lifespan, a resorption phenomenon occurs due to temperature, flow rate and ambient concentration, and a sudden deactivation occurs after the breakthrough point. In addition, in the case of photocatalysts, which have increased in recent years, the system is complicated, the operation cost is high, and the generation of secondary harmful gas due to ozone is pointed out as a disadvantage.

The present invention is to compensate for the disadvantages of the conventional adsorbents and photocatalysts described above, and to provide a method of treating harmful components contained in the air more effectively and more easily applicable. In addition, as a means to solve the above problems it is an object of the present invention to prepare a catalyst for removing harmful components at low temperatures by using a metal component having a decomposition ability and a chemical adsorption capacity for some harmful components at a low temperature.

In order to achieve the above technical problem, the present invention comprises the steps of preparing an inorganic compound carrier selected from the group consisting of activated carbon, alumina, silica and zeolite or mixtures thereof; Preparing an aqueous catalyst precursor solution comprising a manganese compound present in the form of a nitride or sulfide compound and at least one second metal compound selected from the group consisting of copper, silver, cobalt and nickel present in the form of a nitride or sulfide compound; Supporting the inorganic compound carrier in the aqueous catalyst precursor solution; And at least one substance selected from the group consisting of hydrazine, sodium borohydride, hydrogen gas, hydrogen iodide, carbonsulfur dioxide sulfite phosphorus acid, and a reducing agent consisting of phosphate metal sodium, potassium and aluminum. It provides a method for producing a room temperature catalyst for removing odorous substances in the gas phase comprising the step of. In the present invention, the manganese compound is 0.5 to 30 parts by weight based on 100 parts by weight of the carrier based on the manganese metal, the second metal compound is 0.5 to 30 parts by weight based on 100 parts by weight of the carrier based on the metal contained in the compound By weight, the reducing agent is characterized in that 1 to 30 parts by weight is added based on 100 parts by weight of the carrier.

In the present invention, the reducing agent is sodium borohydride, hydrogen sulfide, hydrogen iodide, phosphine, amine, styrene, carbon sulfoxide dioxide phosphoric acid and phosphate hydrophosphorus potassium cyanide hydrazine potassium formate It may include one or more materials selected from the group consisting of cobalt amine, potassium and aluminum.

As the inorganic compound used in the present invention, a solid powdered activated carbon, alumina, silica, zeolite, or the like was used as a carrier, and one or more inorganic compounds may be selected and used. The inorganic compounds used were molded into spherical, pellet, honeycomb, and trilobe forms, and used by mixing two or more inorganic compounds.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention.

Example 1

100 g of a pellet-shaped support prepared from activated carbon was prepared. 17.6 g of manganese nitride was added to 200 g of distilled water, and 1.73 g of silver nitride and 20.9 g of copper nitride were added to the second metal oxide to prepare an aqueous catalyst precursor solution. The pH was adjusted for stability of the catalyst precursor solution, and 5% phosphoric acid solution was used as the component used to adjust the catalyst. The prepared carrier was added to the catalyst precursor aqueous solution and supported at 80 ° C. for 3 hr so as to be sufficiently supported.

In order to increase the catalytic activity by making the supported metal oxide particles fine, a 5% aqueous hydrazine aqueous solution was prepared and 50 g was added thereto and maintained at 100 ° C. for 1 hr.

Then, the supernatant of the solution was discarded and washed repeatedly with distilled water several times so that no residue was present. Then, the washed activated carbon was dried at 150 ° C. for 12 hours to obtain an activated carbon catalyst.

Example 2

A catalyst was prepared in the same manner as in Example 1 using alumina extruded in trilobe form as a support.

Example 3

100 g of a pellet-shaped support prepared from activated carbon was prepared. 67.8 g of manganese nitride was added to 200 g of distilled water, and 2 g of silver nitride and 48.2 g of copper nitride were added to the second metal oxide to prepare an aqueous catalyst precursor solution. The pH was adjusted for stability of the catalyst precursor solution, and 5% phosphoric acid solution was used as the component used to adjust the catalyst. The prepared support was added to the catalyst precursor aqueous solution and then supported at 80 ° C. for 3hr so as to be sufficiently supported.

In order to increase the catalytic activity by making the supported metal oxide particles fine, a 5% aqueous hydrazine aqueous solution was prepared and 150 g was added thereto and maintained at 100 ° C. for 1 hr.

Then, the supernatant of the solution was discarded and washed repeatedly with distilled water several times so that no residue was present. Then, the washed activated carbon was dried at 150 ° C. for 12 hours to obtain an activated carbon catalyst.

Experimental Example

Using each of the catalysts prepared above was tested in the following manner.

First, each of the prepared catalysts is attached to a foam of a polymer material using a binder. At this time, the amount of the catalyst attached is 50g, the catalyst attached to the foam of the polymer material is mounted on the filter mounting portion of the 1m ³ reactor. 10 ppm of acetaldehyde, 20 ppm of ammonia, 20 ppm of hydrogen sulfide, 20 ppm of trimethylamine, and 10 ppm of methyl mercaptan were injected into the reactor, and the residual concentration of the gas present in the reactor was measured after 30 minutes. Table 1 below shows the gas removal rate of the catalyst prepared by each example.

division Acetaldehyde ammonia Hydrogen sulfide Trimethyl amine Methyl mercapten Example 1 76% 85% 71% 84% 73% Example 2 52% 60% 54% 63% 48% Example 3 100% 100% 100% 100% 100%

The metal oxide-impregnated support molded into the sphere, pellet, honeycomb, and trilobite according to the present invention is made of very fine particles of the supported metal catalyst component, thereby maintaining a high function as a metal oxidation catalyst even at room temperature or low temperature. It is possible to obtain a catalyst having excellent decomposition and removal ability of odor gas.

Claims (2)

(Correction) preparing an inorganic compound carrier selected from the group consisting of activated carbon, alumina, silica and zeolite or mixtures thereof; Preparing an aqueous catalyst precursor solution comprising a manganese compound present in the form of a nitriding or sulfide compound and at least one second metal compound selected from the group consisting of copper, silver, cobalt and nickel present in the form of a nitriding or sulfide compound ; Supporting the inorganic compound carrier in the aqueous catalyst precursor solution; And At least one substance selected from the group consisting of hydrazine, sodium borohydride, hydrogen gas, hydrogen iodide, carbonsulfur dioxide sulfite phosphorus acid and a reducing agent consisting of phosphate metal sodium, potassium and aluminum is added to the catalyst precursor aqueous solution. Room temperature catalyst production method for removing odorous substances in the gas phase comprising a step. (Correction) The method according to claim 1, The manganese compound is 0.5 to 30 parts by weight based on 100 parts by weight of the carrier based on the manganese metal, the second metal compound is 0.5 to 30 parts by weight based on 100 parts by weight of the carrier based on the metal contained in the compound, Reducing agent is a catalyst production method, characterized in that added to 1 to 30 parts by weight based on 100 parts by weight of the carrier.