KR20060093086A - Catalyst and device for air cleaning - Google Patents

Abstract

The present invention relates to a catalyst made of a composite form of titanium dioxide having a characteristic of removing volatile organic compounds and air pollutants such as formaldehyde even in the presence of oxygen in the air and radicals of hydroxide, and an air purifier using the same. will be. The present invention for achieving the above object has the advantage of excellent oxidation effect of organic matter even in the absence of light by producing a composite catalyst of at least one metal of magnesium and germanium in the titanium and phosphorus composite material.

Catalyst, Air Purification, Activated Carbon Filter

Description

Catalyst and Device for Air Purification {Catalyst and Device for Air Cleaning}

1 is a non-woven filter or hepa filter coated with a visible light catalyst, a granular activated carbon filter or a fibrous activated carbon filter coated with a visible light catalyst, and an air purifying apparatus including a suction fan.

(Explanation of main parts of drawing)

A: contaminated air

B: Nonwoven Filter or Hepa Filter

C: granular activated carbon filter, or fibrous activated carbon filter

D: suction fan

E: clean air

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purification catalyst using titanium oxide, and the related art uses titanium dioxide as a photocatalyst and water and alcohols as a solvent to irradiate ultraviolet rays to cause a photocatalytic action. However, in the absence of light, the photocatalytic effect has not been shown at all, and the technical limit is still reached. In the past, air purification was performed using photocatalysts or visible photocatalysts, but a lot of energy and by-products were generated to purify the air due to ozone generation and temperature rise due to light energy.

In the present invention, by removing the disadvantages shown in the prior art, by expressing the catalytic effect even in the absence of light, it provides an air purification catalyst and air purification apparatus to remove volatile organic compounds and formaldehyde, such as harmful substances mixed in the air It is.

The air purification catalyst used in the present invention is impregnated with ammonium phosphate or phosphoric acid by phosphorus in TiO ₂ powder as Ti metal, and at least one metal in magnesium chloride or magnesium hydroxide as germanium metal or germanium chloride or germanium oxide as germanium metal. Impregnated and dried at 110 ° C. for at least 6 hours and then calcined at 300 ° C. to 500 ° C. for at least 2 hours to form a Ti-PM composite catalyst, wherein M represents a metal and is at least one of Pt, Pd and Au.

On the other hand, in order to make the Ti-PM composite catalyst as an air purification catalyst, another method is to mix TiCl ₄ or titanium tetraisopropoxide as Ti metal and ammonium phosphate or phosphoric acid as phosphorus, and magnesium chloride or magnesium chloride as magnesium metal One or more metal compounds are mixed in germanium chloride as magnesium hydroxide and germanium metal and prepared by sol-gel method while stirring at 60 rpm or more at 60 ° C. to 150 ° C. for at least 3 hours in an aqueous solution of nitric acid or sulfuric acid or hydrochloric acid to form a Ti-PM composite catalyst. . Where M represents a metal and is at least one of Pt, Pd, Au. The ratio of the materials used in the Ti-PM composite catalyst is mixed by the weight ratio of Ti + P: M = 100: 1 to 1: 1, and mixed by the weight ratio of Ti: P = 10: 1 to 1:10. do. If the weight ratio between the above materials is out of the catalytic effect in the catalyst is lowered air purification effect is significantly reduced.

In the apparatus according to the present invention, as the contaminated air (A) passes through the nonwoven fabric filter or the hepa filter (B), the dust is removed, and the granular activated carbon filter or the fibrous activated carbon coated with the Ti-PM composite catalyst as shown in FIG. After passing through the filter layer (C), the fine dust is removed by passing through the suction fan (D), volatile organic compounds and formaldehyde is converted to carbon dioxide and water, viruses and bacteria are sterilized and turned into clean air (E). The apparatus according to the present invention can be used in an air purifier or an air purifying air conditioning system and the like, and can be widely used in the field of air purification applying this.

The present invention is explained in more detail by the following examples, which are not intended to limit the present invention.

Examples 1 to 4 and Comparative Examples 1 to 4 showed the ability to remove Staphylococcus aureus by toluene, formaldehyde, and bactericidal activity as a volatile organic compound using a device of the present invention for each combination of catalyst metals.

Table 1 shows the removal rate of staphylococci and the dust removal rate of toluene and formaldehyde as a constituent and volatile organic compound of visible photocatalyst, and bactericidal performance. The space velocity was 50,000 / hr, and was used in a dark room without a light source. The initial concentration of dust was 80 µg / m 3, the initial concentration of toluene was 100 ppm, the formaldehyde was 50 ppm, and the air of the present invention was maintained for 2 hours. The removal rate was measured after passing through the clarifier. Staphylococcus was measured after incubation for 24 hours in the air passing through the apparatus of the present invention, was tested by the Shake Flask Method method of KSM0146-2003.

Example 1

The Ti-PM composite catalyst component is Ti metal and 10 g of TiO ₂ powder, so that 3 g of ammonium phosphate and M metal is platinum, and 3 g of platinum chloride is impregnated with platinum metal and dried at 110 ° C. for at least 6 hours, and then at 400 ° C. Firing for 2 hours to form a Ti-P-Pt composite catalyst, it was coated on both the HEPA filter layer (B) and granular activated carbon filter layer (C). The air purifier used in the present invention is the same as that shown in Figure 1, the air containing the contaminated air (A) dust containing 80㎛ / ㎥, 100ppm toluene, 50ppm formaldehyde Ti-P-Pt composite catalyst After passing through the HEPA filter layer (B) and the granular activated carbon filter layer (C) in turn, and passing through the suction fan (D), the removal rate of formaldehyde, toluene, dust, staphylococcus was measured.

At this time, the flow rate of the contaminated air was a space velocity of 50,000 / hr, and the experiment in the dark room.

Example 2)

The Ti-PM composite catalyst contains 10 g of titanium tetraisopropoxide as a Ti metal, 3 g of ammonium phosphate as phosphorus, and 3 g of M metal as platinum, and 3 g of platinum chloride as a platinum metal. It was prepared in the sol-gel method with stirring for a Ti-P-Pt composite catalyst, and the same as in Example 1 except that it was coated on both the HEPA filter layer (B) and the granular activated carbon filter layer (C).

Example 3

In Ti-P-M composite catalyst, it is the same as that of Example 1 except for using Pd instead of Pt as M metal component and 3g of palladium chloride as Pd metal.

Example 4

In Ti-P-M composite catalyst, it is Au instead of Pt as the M metal component, and is the same as Example 1 except that 3g of gold chloride is used as Au metal.

Comparative Example 1)

The Ti-P composite catalyst component was impregnated with 10 g of TiO ₂ powder as Ti metal, impregnated with 3 g of ammonium phosphate, dried at 110 ° C. for at least 6 hours, and then calcined at 400 ° C. for 2 hours to form a Ti-P composite catalyst. The same as in Example 1 except that both the filter layer (B) and the granular activated carbon filter layer (C) were coated.

Comparative Example 2)

The Ti-Pt composite catalyst component was impregnated with 10 g of TiO ₂ powder as Ti metal and ₃ g of platinum chloride as platinum metal, dried at 110 ° C. for at least 6 hours, and calcined at 400 ° C. for 2 hours to form a Ti-Pt composite catalyst. The same as in Example 1 except that both the HEPA filter layer (B) and the granular activated carbon filter layer (C) were coated.

Comparative Example 3)

The Ti-Pd composite catalyst component was prepared by the sol-gel method by mixing 10 g of titanium tetraisopropoxide as a Ti metal and 3 g of palladium chloride as a palladium metal and stirring at 90 ° C. or higher at 60 ° C. for 3 hours in an aqueous solution of nitric acid. A catalyst was prepared and coated in both the HEPA filter layer (B) and the granular activated carbon filter layer (C).

Comparative Example 4)

P-Pt catalyst was prepared by the sol-gel method by mixing 3 g of platinum chloride as a Pt metal with 10 g of ammonium phosphate as a phosphorus and stirring for 3 hours at 90 ° C. or more at 90 ° C. in a nitric acid solution. The same as in Example 1 except that all the coating on the filter layer (C).

Table 1. Removal of Toluene and Formaldehyde and Removal of Dust and Staphylococcus

As described in detail above, the air purification catalyst used in the present invention is excellent in the oxidation of organic matter even in the absence of light, and provides an excellent effect of oxidizing volatile organic compounds or organic matter at room temperature without light. And the device according to the present invention is excellent in the removal and sterilization of late-end organic compound provides an excellent air purification ability.

Claims (5)

Ti-P-M composite catalyst, wherein M represents a metal and is an air purification catalyst characterized in that it is at least one metal of Pt, Pd, Au The ratio of materials used in the Ti-PM composite catalyst of claim 1 is used by mixing in a weight ratio of Ti + P: M = 100: 1 to 1: 1, Ti: P = 10: 1 to 1:10 Air purification catalyst, characterized in that used by mixing in weight ratio TiO ₂ powder as Ti metal is impregnated with ammonium phosphate or phosphoric acid as phosphorus component, impregnated with at least one metal in platinum chloride as Pt metal, palladium chloride as palladium metal, gold as gold chloride and dried at 110 ° C for at least 6 hours. Method for producing an air purification catalyst characterized in that the composite catalyst is made by baking for 2 hours or more between 300 ℃ to 500 ℃ after TiCl ₄ or titanium tetraisopropoxide as the Ti metal and ammonium phosphate or phosphoric acid as the phosphorus component are mixed, and one or more metals are mixed with platinum chloride as the Pt metal, palladium chloride as the palladium metal and gold chloride as the gold. A method for preparing an air purifying catalyst, characterized in that the sol-gel method is prepared by stirring at 60 rpm or more at 60 rpm in an aqueous solution of sulfuric acid or hydrochloric acid for at least 3 hours. The contaminated air passes through the nonwoven filter or hepa filter coated with Ti-PM composite catalyst, and then the granular activated carbon filter or fibrous activated carbon filter layer, and then the dust is removed and the volatile organic compounds and formaldehyde are converted into carbon dioxide and water. Is a sterilized and changed to clean air, wherein M represents a metal and is characterized in that at least one metal of Pt, Pd, Au.

Images