JPH11319570A - Composite photocatalyst - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a composite photocatalyst in which deodorizing performance generated by the adsorption and decomposition actions and desorption performance of an adsorption component compatible with each other by compositing a zeolite photocatalyst carrying copper, silver, vanadium, iron, titanium, chrome and a titanium photocatalyst carrying palladium and platinum together. SOLUTION: A deodorizing device 8a comprising composite photocatalysts constituting a deodorizing filter device set on the inside of an air suction grille of a sealing embedded air cleaner is provided with a flexible sheet like base 80, and a number of zeolite photocatalysts 81... carrying copper dispersingly are provided on one side face of the base 8a. Also titanium photocatalysts 82... carrying palladium dispersingly are carried uniformly so as to be in the state of integrally all composited together on the surfaces of respective zeolite photocatalysts 81.... The adsorption and the oxidization decomposition of odorous gas and toxic gas are carried out simultaneously by both functions of an adsorbent and the photocatalyst of the photofatalysts 81... in the state of turning on a light source lamp and emitting ultraviolet rays.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photocatalyst having a deodorizing function.

[0002]

2. Description of the Related Art Recently, in the living environment of people, for example, the odor of perm (beauty salon), body odor, odor of buildings (VOC of plywood in new construction), pet odor, tobacco odor, garbage (kitchen) odor, etc. Often, odorous and harmful gas components present in the air in living spaces are often considered to be a problem, and the demand for the performance of removing such odorous gas and harmful gas also increases in air purifiers and air conditioners. ing.

The gas components to be removed include, for example, ammonia, acetaldehyde, trimethylamine and methyl mercaptan, which are the four major odor components in daily life, as well as harmful gas components such as carbon monoxide and formaldehyde. Have been.

Therefore, for example, in a conventional air conditioner, as a method of removing such odorous gas and harmful gas components which have a bad influence on human comfort and environmental life, an air filter is generally combined with an adsorbent such as activated carbon or zeolite. Although a deodorizing filter using a plant-based deodorant and the like are used, they have a limited service life because the adsorbed substance cannot be desorbed.

In order to solve such a problem,
For example, if an attempt is made to achieve a deodorizing effect by using a separate or built-in ventilation fan, there is a problem in that the air conditioning load increases and the running cost of the air conditioner increases, or the air conditioning capacity becomes insufficient.

Under these circumstances, recently, the oxidative decomposition of odor components by the photocatalyst can occur even at room temperature by irradiating short-wavelength light. Attention,
Various studies have been made.

[0007]

However, when a photocatalyst structure composed of a photocatalyst and an adsorbent used for deodorizing odors is examined, the deodorization is performed by the adsorption process of the adsorbent and the odor gas decomposition process of the photocatalyst. Although performance continues, desorption of odor gas from the adsorbent is not always sufficient for several types of highly adsorbable odors, and the problem is that the odor gas remaining on the adsorbent gradually degrades the performance. Is left. On the other hand, if the desorption performance is emphasized, on the other hand, there is a problem that the easily desorbable odor in various odors is desorbed before being oxidized and decomposed, and the deodorization performance is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a zeolite-based photocatalyst supporting at least one of copper, silver, vanadium, iron, titanium, and chromium and palladium and platinum A titania-based photocatalyst supporting at least one of the above, to provide a composite photocatalyst in which deodorization performance by adsorption / decomposition action and desorption performance of an adsorbed component are appropriately compatible. It is the purpose.

[0009]

Means for Solving the Problems In order to achieve the above object, the present invention is provided with the following means for solving the problems.

The composite photocatalyst of the present invention comprises a zeolite-based photocatalyst supporting at least one of copper, silver, vanadium, iron, titanium, and chromium, and a titania-based photocatalyst supporting at least one of palladium and platinum. Are combined with each other.

Therefore, in the composite photocatalyst having the above structure, first, a zeolite-based photocatalyst carrying at least one of the above-mentioned copper, silver, vanadium, iron, titanium and chromium has both functions of an adsorbent and a photocatalyst, and has an odor component. Etc. and oxidative decomposition are performed simultaneously. However, only the zeolite-based photocatalyst supporting copper or the like has insufficient oxidative decomposition ability, and some odor components are desorbed without decomposition. Therefore, the deodorized odor is combined with the zeolite-based photocatalyst supporting copper or the like, and is reliably oxidized by the titania-based photocatalyst supporting palladium or the like, which is a highly active photocatalyst having a high oxidative decomposition ability, which is present in the vicinity thereof. Decompose and deodorize.

That is, in this configuration, the odor component is first adsorbed on the zeolite-based photocatalyst to be oxidatively decomposed, and the odor component that is gradually desorbed is surely decomposed by the nearby titania-based photocatalyst. The odor component remaining on the zeolite-based photocatalyst can be gradually decomposed without being desorbed to the surroundings while being adsorbed. Therefore, the deodorizing performance is improved.

As a method for supporting at least one of copper, silver, vanadium, iron, titanium, and chromium on the zeolite-based photocatalyst, for example, an ion exchange method, an ion implantation method, or a synthesis method is employed. .

The deodorizing structure supporting the composite photocatalyst is prepared by dispersing the composite photocatalyst on a substrate formed in a flat plate shape, a pleated flat plate shape, a lattice shape, a honeycomb shape or a corrugated shape. It is formed into an effective structure suitable for a deodorizing filter device such as an air conditioner, which has good air permeability and allows light from a light source to sufficiently reach the entire deodorizing surface.

[0015]

As described above, according to the composite photocatalyst of the present invention, it is possible to regenerate the deodorizing performance by the regular regeneration operation, and the optimum long life for an air conditioner including an air purifier is provided. Can be provided.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Configuration of Air Conditioner Common to Each Embodiment) First, FIG. 1 is configured by applying a deodorizing filter device comprising a composite photocatalyst according to each embodiment of the present invention described later. 1 shows a configuration of an air conditioner 1 according to an embodiment.

In the figure, reference numeral 2 denotes a cassette-type main body casing of, for example, a ceiling embedded type air cleaner 1. The main body casing 2 is configured such that an intake / outlet panel portion (lower panel portion) 4 is continuous with the ceiling 3 in substantially the same plane.
It is buried in the ceiling 3.

An air intake grille 5 is provided at the center of the intake / outlet panel portion 4 of the main body casing 2, and a pre-filter 7 is located inside the air intake grille 5.
a, an electrostatic precipitating filter 7b, and a deodorizing filter device 8 composed of a composite photocatalyst are sequentially arranged side by side from the upstream side to the downstream side of the air flow.

Further, an air outlet 9 having a predetermined width is provided at a position on the outer peripheral portion 4 of the air suction grille 5 of the intake / outlet panel portion 4.

With the above configuration, the pre-filter 7 is provided in the main body casing 2 from the air suction grill 5.
a, a ventilation path 10 is formed to reach the air outlet 9 via the electrostatic precipitating filter 7b and the deodorizing filter device 8,
A diagonal flow fan 11 is suspended from the ceiling panel 12 of the main casing 2 via a fan motor 11a at a position behind (in the upper part of) the deodorizing filter device 8 in the ventilation passage 10.

A heat exchanger 15 such as an evaporator is provided around the diagonal flow fan 11, and a wind direction guide plate 14 is provided at the air outlet 9 at an inclination angle in a predetermined blowing direction. It is provided.

As described above, in the air conditioner according to the present embodiment, a rectangular air intake grille 5 is provided at the center of the intake / outlet panel portion 4 on the lower surface side of the cassette type main body casing 2.
And an air outlet 9 inclined at a predetermined angle in the outer peripheral direction around the outer periphery of the air suction grill 5 and a recirculation type ventilation passage 1 extending from the air suction grill 5 to the air outlet 9.
0, and a mixed flow fan 11 is provided at the center of the ventilation path 10.
By arranging the heat exchangers 15 around the outside, the air sucked from the air suction grill 5 is passed through the pre-filter 7a, the electrostatic precipitating filter 7b, the deodorizing filter device 8, and the heat exchanger 15. After collecting, deodorizing, and exchanging heat, the air is blown from the air outlet 9 toward the lower floor surface of the room at a predetermined blowing angle.

Meanwhile, the deodorizing filter device 8 comprising the above-mentioned composite photocatalyst is configured as shown in the following embodiments.

(Embodiment 1) FIGS. 2 to 4 show a configuration of a composite photocatalyst according to Embodiment 1 of the present invention and a deodorizing filter device formed by the composite photocatalyst.

FIG. 2 shows the basic structure of a deodorizing device 8a comprising a composite photocatalyst constituting the deodorizing filter device 8, and reference numeral 80 denotes the deodorizing device 8a.
Is a flexible sheet-shaped substrate.

On one side surface of the substrate 80, a large number of zeolite-based photocatalysts 81, 81... On which copper (Cu) is dispersed and supported by, for example, an ion exchange method are provided. Are uniformly supported on the surfaces of the photocatalysts 81, 81..., For example, in such a manner that palladium (Pd) is dispersedly supported and titania-based photocatalysts 82, 82. ing.

Therefore, in the deodorizing device 8a comprising the composite photocatalyst, the zeolite-based photocatalysts 81, 81... Dispersing and supporting the copper have both functions as an adsorbent and a photocatalyst, and adsorb odor and harmful gas components. And oxidative decomposition are performed simultaneously. However, the capacity for oxidative decomposition is insufficient with only the zeolite-based photocatalysts 81, 81... Carrying copper, and a predetermined amount of odor and harmful gas components are desorbed, and the desorbed odor and harmful gas are depleted. The components cannot be oxidatively decomposed. Therefore, the desorbed odor and harmful gas components are further dispersed and loaded with palladium, which is a highly active photocatalyst having a high oxidative decomposition performance and present on the surface of the zeolite-based photocatalysts 81, 81... Oxidative decomposition treatment is performed with a titania-based photocatalyst for deodorization.

That is, in this configuration, as shown in FIG. 3, for example, the light source lamp 20 is first turned on to irradiate ultraviolet light, and the odor and harmful gas components passing therethrough are converted into the zeolite-based photocatalysts 81, 81. (A) and gradually oxidatively decompose as much as possible (b). And the odor and harmful gas components which gradually desorb (c) in spite of that,
Oxidized and decomposed (d) by the titania-based photocatalysts 82, 82... On the surface thereof, so that the odor and harmful gas components remaining on the zeolite-based photocatalysts 81, 81. It is possible to gradually oxidize and decompose it as it is. And then, when you play it,
Return to the original activated state (e).

As a result, according to the composite photocatalyst type deodorizing device 8a of the present embodiment, the deodorizing performance can be regenerated by a regular regenerating operation.
A long-life deodorizing filter device 8 suitable for an air conditioner including an air purifier can be provided.

When the deodorizing filter device 8 is formed, for example, as shown in FIG. 4, the deodorizing device 8a as shown in FIG. And juxtaposed at predetermined intervals,
The light source lamps 20, 20,... Are interposed at the intermediate portions thereof to be used as a common light source.

According to such a configuration, the light source lamp 2
.. 0 are deodorizing devices 8a, 8 of each composite photocatalyst.
Since the lamp is placed between the lamps “a”, dirt does not easily adhere to the lamp, and the lamp performance can be maintained for a long period of time.

(Embodiment 2) Next, FIG. 5 shows the configuration of a composite photocatalyst according to Embodiment 2 of the present invention and a deodorizing filter device including the composite photocatalyst.

In this embodiment, the deodorizing device 8a having the basic structure as shown in FIG. 2 is adopted, and the base members 80 are formed by combining them in a lattice as shown in FIG. On the upstream side, columns 20a, 20a,.
Are provided via the light source lamps 20, 20,....

According to such a configuration, the deodorizing device 8
The ventilation resistance can be suppressed to a minimum while the area of the deodorizing section a is sufficiently large. Light source lamp 2
Are provided on the upstream side of the air stream having the largest amount of odor components, so that the deodorizing surface on the upstream side of the air stream having a large deodorizing load can be more effectively activated, and the deodorizing efficiency can be improved. improves.

(Other Embodiments) In the above two embodiments, for example, (1) a zeolite-based photocatalyst 81
(2) an ion-exchange method for supporting the copper, (3) a platinum dispersedly supported as a titania-based photocatalyst 82, (4) a substrate for a deodorizing device. Although the structure of No. 80 is formed in a mesh shape or a lattice shape, each of these configurations (1) to (4) is
Each of the embodiments can be changed to the following embodiments, and any of them can obtain substantially the same effects as those described above.

(1) Zeolite-based photocatalyst 81: 1-1) Silver (Ag) dispersed and supported instead of copper (Cu) 1-2) Vanadium (V) dispersed instead of copper (Cu) 1-3) Iron (Fe) dispersed and supported in place of copper (Cu) 1-4) Titanium (Ti) dispersed and supported in place of copper (Cu) 1-5) A method in which chromium (Cr) is dispersed and supported in place of copper (Cu) (2) A method in which zeolite-based photocatalyst 81 is dispersed and supported 2-1) A method in which ion implantation is used instead of ion exchange 2- 2) A method using a synthesis method (CVD method) instead of the ion exchange method (3) Regarding titania-based photocatalyst 82 3-1) A method in which platinum (Pt) is dispersed and supported instead of palladium (Pd) (4) ) Structure of deodorizing device 8a 4-1) The one adopting a honeycomb structure instead of a plate-like or lattice-shaped 4-2) The one adopting a corrugated structure instead of a plate-like or lattice-like 4-3) The one adopting a plate-like or lattice-like With a pleated structure

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of an air conditioner as a common application example of a deodorizing device including a composite photocatalyst according to each embodiment of the present invention.

FIG. 2 is a sectional view showing a basic structure of the composite photocatalyst according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing an adsorption-deodorization-regeneration mechanism of the composite photocatalyst.

FIG. 4 is a cross-sectional view showing a configuration example of a deodorizing filter device including the composite photocatalyst.

FIG. 5 is a perspective view illustrating a configuration example of a deodorizing filter device including a composite photocatalyst according to a second embodiment of the present invention.

[Description of References] 8 is a deodorizing filter device, 8a is a deodorizing device, 20 is a light source lamp, 80 is a base material, 81 is a zeolite-based photocatalyst,
Reference numeral 82 denotes a titania-based photocatalyst.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B01D 53/36 H

Claims (9)

[Claims] 1. A zeolite-based photocatalyst supporting at least one of copper, silver, vanadium, iron, titanium and chromium and a titania-based photocatalyst supporting at least one of palladium and platinum are mutually combined. Composite photocatalyst. 2. The composite photocatalyst according to claim 1, wherein the zeolite-based photocatalyst and the titania-based photocatalyst, which are combined with each other, are dispersed on a substrate having a flat plate shape or a pleated flat plate shape. . 3. The composite photocatalyst according to claim 1, wherein the zeolite-based photocatalyst and the titania-based photocatalyst mutually dispersed are dispersed on a lattice-shaped substrate. 4. The composite photocatalyst according to claim 1, wherein the zeolite-based photocatalyst and the titania-based photocatalyst mutually dispersed are dispersed on a honeycomb substrate. 5. The composite photocatalyst according to claim 1, wherein the zeolite-based photocatalyst and the titania-based photocatalyst mutually dispersed are dispersed on a corrugated base material. 6. The method of claim 1, wherein at least one of copper, silver, vanadium, iron, titanium, and chromium is supported on a zeolite-based photocatalyst by an ion exchange method. 6. The composite photocatalyst according to 4 or 5. 7. The method of claim 1, wherein at least one of copper, silver, vanadium, iron, titanium, and chromium is supported on a zeolite-based photocatalyst by ion implantation. 6. The composite photocatalyst according to 4 or 5. 8. The method according to claim 1, wherein at least one of copper, silver, vanadium, iron, titanium and chromium is supported on the zeolite-based photocatalyst by a synthesis method. Or the composite photocatalyst according to 5. 9. The air conditioner is configured as a deodorizing filter device for an air conditioner.
The composite photocatalyst according to 4, 5, 6, 7 or 8.