JP2004113653A - Air purification apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air purification apparatus which can reduce flowing out ozone and can be composed in a compact manner. <P>SOLUTION: An ozonolysis promoter or active carbon 6 is carried by electrodes 4a-4c on the downstream side of an air stream among electrodes 2 and 4a-4c. This is done by notifying that the air after purified and treated with a catalyst body 3 passes surely finally the electrodes 4a-4c on the downstream side, thereby the flowing out ozone is vanished and the air purification apparatus can be constituted to compact size. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to various odors generated in a living environment, formaldehyde and volatile organic compounds (VOC) generated from building materials and furniture, and various odors generated in a vehicle cabin or flowing from outside air. The present invention relates to an air purification device for purifying gaseous pollutants contained in air, such as exhaust gas, and more particularly to a structure for making an air purification device compact when using discharge energy.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is an air purification device that generates corona discharge or creeping discharge between electrodes, and decomposes and removes gaseous pollutants by the discharge energy. FIG. 3 is a schematic diagram showing a basic structure of a conventional air purification device using such discharge energy. In this device, a high voltage 5 is applied between the electrodes 2 in the air passage 1a of the housing 1 to generate a discharge, and the excited plasma passes through the downstream catalyst 7 on the air flow to remove deodorization. Is going.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned conventional method, there is a problem that ozone generated by the discharge flows out into the air without being completely consumed. Even if the outflow of ozone does not reach the environmental standard, an increase in the concentration of ozone in the treated air has a bad effect on the human body.
[0004]
Therefore, it is possible to lower the ozone concentration to a level that does not cause a problem by arranging a catalyst body or an activated carbon carrying an ozone decomposition catalyst downstream of this air purification device, but the size of the air purification device becomes large. It is. The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide an air purifying apparatus that can eliminate outflow ozone and can be configured to be compact.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the technical means described in claims 1 and 3 are adopted. That is, according to the first aspect of the present invention, a catalytic action is exerted on the catalyst carrier between the electrodes (2, 4a to 4c) and the electrodes (2, 4a to 4c) in the air passage (1a) even at room temperature. And a catalyst (3) carrying a catalyst which is activated and activated by the energy of the discharge. A high voltage is applied between the electrodes (2, 4a to 4c) to cause a discharge, and the catalyst (3) ), An ozone decomposition catalyst or activated carbon (6) is placed on the downstream electrode (4a-4c) of the air flow among the electrodes (2, 4a-4c). It is characterized by being carried.
[0006]
This focuses on the fact that the treated air that has been purified by the catalyst (3) always passes through the downstream electrode at the end, thereby eliminating outflowing ozone and making the air purification device compact. Can be configured.
The invention according to claim 2 is characterized in that manganese dioxide or a material containing this as a main component is used as the ozone decomposition catalyst. This is because ozone is effectively decomposed by reaction with manganese dioxide.
[0007]
In the invention according to claim 3, the downstream electrode (4a to 4c) is a porous metal net (4a), an aluminum honeycomb (4b), an extruded honeycomb (4c) of activated carbon (6), or granular activated carbon. (6) is characterized by being fixed by a porous metal net (4a). This can be used as a downstream electrode for generating a discharge, and at the same time, ozone can be removed effectively by passing purified air through the electrode itself. Note that the reference numerals in parentheses of the above means indicate the correspondence with specific means described in the embodiment described later.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram illustrating a basic structure of an air purification device according to an embodiment of the present invention. The purifying section of the air purifying device is arranged in an air passage 1 a in the housing 1. A pair of electrodes 2.4a to 4c is arranged in the air passage 1a, and a catalyst body 3 is arranged between the electrodes 2.4a to 4c.
[0009]
This is an air purification device that applies a high voltage of several kV from the high voltage power supply 5 between the electrodes 2.4a to 4c to generate a discharge and to purify the air by passing the processing air through the catalyst body 3. The electrodes 2 and 4a of the paired electrodes are formed of a porous metal net such as a perforated metal or a metal mesh. The waveform of the high voltage applied for the discharge is a sawtooth wave, a pulse wave, a rectangular wave, an alternating current, and a pulsating flow.
[0010]
The purifying member 3 is made of a gas-permeable honeycomb, a cotton-like, woven or non-woven fabric, or a foam made of a catalyst, platinum, gold, or an adsorbent described later. Alternatively, these molded articles, ceramic honeycombs or foams serving as catalyst carriers, corrugated articles of ceramic paper, cotton-like, woven or non-woven fabrics of ceramic fibers or glass fibers, etc. And corrugated paper made of paper.
[0011]
The supported catalyst is, for example, a catalyst activated by the energy of discharge, and specifically,
{Circle around (1)} A catalyst in which one or more oxides of manganese (Mn), oxides of iron (Fe), oxides of aluminum (Al), and oxides of magnesium (Mg) are mixed or combined. A catalyst in which at least one of oxides of cobalt (Co), oxides of copper (Cu) and oxides of nickel (Ni) are mixed or complexed with the above catalyst (3): Zirconium (Zr) is added to the above catalyst Catalyst of at least one of oxides of zinc, oxides of zinc (Zn), oxides of cerium (Ce), oxides of calcium (Ca) and oxides of lithium (Li). ▼: Catalyst in which any of the above catalysts is supported on sepiolite. ▲ 5: Catalyst in which ultrafine platinum particles are mixed with any of the above catalysts. Then, for example, the carrier is impregnated in a slurry in which the catalyst is mixed with a liquid, and the catalyst is attached to the carrier.
[0012]
When a high voltage is applied between the electrodes 2 and 4a via the catalyst 3, an air discharge occurs between the electrodes 2 and 4a by utilizing the moisture in the air around the catalyst 3, and this discharge occurs. This activates the nearby catalyst and oxidizes and decomposes odorous components. An example of the decomposition of acetaldehyde (CH ₃ CHO) is shown below as a typical reaction formula.
Embedded image 2CH ₃ CHO + 5O ₂ → 4CO ₂ + 4H ₂ O
[0013]
The porous metal net 4a of the downstream electrode carries manganese dioxide or a material containing it as a main component as an ozonolysis catalyst, for example, by bonding with a silica-based binder. FIG. 2 is a schematic diagram showing another embodiment of the downstream electrode 4a.
[0014]
FIG. 2A shows an aluminum honeycomb 4b formed from a sheet formed of aluminum into a corrugated honeycomb. The above-mentioned ozone decomposition catalyst or activated carbon is carried on the surface of the honeycomb by bonding with a binder or the like. Let me. FIG. 2B shows an activated carbon honeycomb 4c formed by extruding activated carbon together with a binder, and FIG. 2C shows a granular activated carbon 6 fixed by a porous metal net 4a similar to the above.
[0015]
The reaction formula of the ozonolysis catalyst is as follows: O ₃ + cat. → cat. —O + O ₂ (cat .: catalyst)
Embedded image 2 cat. -O → cat. + O ₂
When organic matter (odorous gas or activated carbon supported together) is present, cat. −O + X → cat. + XO (XO: oxidation product such as CO ₂ )
A reaction like this also occurs. In addition, in the case of activated carbon 6, C + O ₃ → CO or CO ₂ + O ₂
Activated carbon itself is oxidized to decompose ozone as in
[0016]
Next, features and effects of the present embodiment will be described. An ozone decomposition catalyst or activated carbon 6 is carried on the downstream electrodes 4a to 4c of the air flow among the electrodes 2.4a to 4c. This focuses on the fact that the treated air that has been purified by the catalyst 3 always passes through the downstream electrodes 4a to 4c at the end, thereby eliminating the ozone flowing out and making the air purification device compact. Can be configured.
[0017]
In addition, manganese dioxide or a material containing it as a main component is used as the ozone decomposition catalyst. This is because ozone is effectively decomposed by reaction with manganese dioxide. The downstream electrodes 4a to 4c are formed by fixing a porous metal net 4a, an aluminum honeycomb 4b, an extruded honeycomb 4c of activated carbon 6, or a granular activated carbon 6 by a porous metal net 4a. This can be used as a downstream electrode for generating a discharge, and at the same time, ozone can be removed effectively by passing purified air through the electrode itself.
[0018]
(Other embodiments)
Since the above-described embodiment has a basic configuration of the electrodes 2, 4a to 4c and the catalyst body 3, a structure in which a plurality of pairs of the electrodes 2, 4a to 4c and the plurality of catalyst bodies 3 are naturally stacked may be employed.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a basic structure of an air purification device according to an embodiment of the present invention.
FIG. 2 is a schematic diagram showing another embodiment of a downstream electrode.
FIG. 3 is a schematic diagram illustrating a basic structure of a conventional air purification device.
[Explanation of symbols]
1a Air passage 2 Perforated metal, metal mesh (electrode, upstream electrode)
3 Catalyst 4a Perforated metal, metal mesh (electrode, downstream electrode, porous metal net)
4b Aluminum honeycomb (electrode, downstream electrode)
4c Activated carbon extruded honeycomb (electrode, downstream electrode)
6 activated carbon

Claims (3)

A pair of electrodes (2, 4a-4c) in the air passage (1a);
A catalyst body (3) supporting a catalyst that exhibits a catalytic action at room temperature and is activated by discharge energy between the electrodes (2, 4a to 4c);
In an air purification device, a high voltage is applied between the electrodes (2, 4a to 4c) to generate a discharge and to purify air by passing process air through the catalyst (3).
An air purifying apparatus characterized in that an ozone decomposition catalyst or activated carbon (6) is carried on the downstream electrodes (4a to 4c) of the air flow among the electrodes (2, 4a to 4c). The air purification device according to claim 1, wherein manganese dioxide or a material containing the manganese dioxide as a main component is used as the ozone decomposition catalyst. The downstream-side electrodes (4a to 4c) may be made of a porous metal net (4a), an aluminum honeycomb (4b), an extruded honeycomb (4c) of activated carbon (6), or the granular activated carbon (6). The air purification device according to claim 1 or 2, wherein the air purification device is fixed by a metal net (4a).

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