CN113509836A

CN113509836A - Photo-induced heating driven VOCs catalytic degradation device and application

Info

Publication number: CN113509836A
Application number: CN202011152649.7A
Authority: CN
Inventors: 于一夫; 陈凡芃; 张兵
Original assignee: Tianjin Tianke Water Treatment Technology Co ltd
Current assignee: Tianjin Tianke Water Treatment Technology Co ltd
Priority date: 2020-10-26
Filing date: 2020-10-26
Publication date: 2021-10-19

Abstract

The invention discloses a photo-induced heating driven VOCs catalytic degradation device and application thereof, and the device comprises a top end rotating mechanism, a first connecting shaft, an upper bracket, a cavity, a bracket and a base, wherein the top end rotating mechanism is connected with the upper bracket through the first connecting shaft; a catalyst is disposed on the carrier and the cavity is contoured to facilitate focusing of light onto the carrier. The invention can solve the problems that the traditional VOCs degradation means only depends on the adsorption/degradation of VOCs molecules after the VOCs molecules are diffused to the surface of a degraded substance, the action range is limited, and the efficiency is poor.

Description

Photo-induced heating driven VOCs catalytic degradation device and application

Technical Field

The invention relates to a catalytic degradation technology, in particular to a photothermal-driven VOCs catalytic degradation device and application thereof.

Background

In recent years, as people's health consciousness is continuously raised, the harm of Volatile Organic Compounds (VOCs) in a closed space (such as indoor space and in a vehicle) is more and more important. VOCs include benzene, toluene, p-xylene, ethylbenzene, formaldehyde and other gases, which not only stimulate human mucous membranes and respiratory systems, but also cause headache, nausea, fatigue, chest distress, short breath, allergic symptoms and even malignant symptoms such as leukemia after long-term contact.

At present, the effective mode is ventilation, natural wind convection is introduced, and the concentration of VOCs in the room is reduced. However, when the air pollution is increasingly serious, frequent ventilation may introduce external pollution and the operation is inconvenient. The condition in the car is more serious, and firstly the car space is little, and the VOCs concentration that parts such as seat lasted emission is higher, and windowing can cause strong convection to arouse the human body discomfort when on the other hand is high-speed to be gone, leads to windowing ventilation method very restricted.

Many products based on physical adsorption, chemical degradation, sprays, paints, particles, etc. have appeared in the market early, and although these products can adsorb/degrade nearby VOCs to some extent under specific conditions, they are limited by the diffusion rate of molecules, and their range of action is very limited and their efficiency is low. In addition, these products often need to be replaced in a timely manner, or else there is a risk of secondary contamination.

In recent years, new products for eliminating VOCs have appeared on the market, including large-scale ventilation and adsorption appliances (including fresh air systems) of the plug-in type and small-scale devices of photo/electric degradation using rechargeable batteries of storage batteries/mechanical energy. Air convection is introduced into a large device, the treatment effect on VOCs is good, but continuous energization is required, the energy consumption is high, the product price is high, the occupied area is large, and the wide application is difficult. Small devices are relatively low in price, but need to be replaced periodically or shaking for charging and the like, the practical effective time is limited, most products still rely on molecular diffusion to play a role, the action range is limited, and the efficiency is low. Therefore, the novel degradation device has the advantages of low development energy consumption, simple maintenance, promotion of molecular motion, high VOCs treatment efficiency and small occupied area, and has very important application prospect and economic value.

Catalytic combustion is taken as a means for treating organic waste gas in a large scale, and in recent years, the catalytic combustion is widely paid attention and developed in the aspect of treating VOCs (volatile organic compounds), but the catalytic combustion has the problem of high ignition temperature and has certain safety risk when being applied indoors and in vehicles. In addition, the air is heated, expanded, reduced in density and moved upwards, and is combined with catalytic combustion, so that air convection can be caused, and the VOCs treatment efficiency is improved. Therefore, the surface temperature of the catalyst is raised by utilizing a mild and controllable heating mode, such as photoinduced heating and the like, catalytic combustion is initiated, and the catalytic combustion is combined with the heated expansion and rising movement of air, so that the method has important significance for developing novel efficient VOCs degradation devices.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and products in degrading and eliminating VOCs in a closed space, and provides a photothermal-driven VOCs catalytic degradation device and application.

The technical purpose of the invention is realized by the following technical scheme.

The utility model provides a driven VOCs catalytic degradation device generates heat by light, includes top rotary mechanism, first connecting axle, upper bracket, cavity, bracket and base, wherein:

the top end rotating mechanism is connected with the upper support through a first connecting shaft, a cavity is arranged between the upper support and the base, and a bracket connected with the base is arranged in the cavity; a catalyst is arranged on the bracket and is used for catalyzing and degrading VOCs; the shape of the cavity is set to be beneficial to converging light rays to the bracket, such as a nearly spherical shape or a nearly cylindrical shape, and the cavity is made of transparent materials, such as quartz and acrylic.

And an anti-reflection and anti-reflection coating is plated on the inner surface of the cavity to increase the transmission of infrared rays and increase the surface temperature of the catalyst.

And a coating with ultraviolet-visible light photovoltaic response is arranged on the inner surface and/or the outer surface of the cavity and is connected with a small-sized solar matched battery arranged in the base so as to increase the sunlight utilization rate.

In the invention, the coating on the inner surface and/or the outer surface of the cavity is one or more layers of coatings consisting of one or more of magnesium fluoride, titanium dioxide, silicon dioxide, aluminum oxide, zirconium dioxide, zinc selenide, zinc sulfide and other anti-reflection film materials or photovoltaic materials.

The bracket comprises a tray and a second connecting shaft, the second connecting shaft is used for being connected with the base so as to realize stable connection, a catalyst is arranged on the tray, and if the tray with a non-hollow structure is adopted, the catalyst is arranged in a groove of the tray; if the tray with the hollow structure is adopted, the catalyst is arranged in a groove of a non-hollow part of the tray, or is compounded with a heat-resistant and breathable film of a hollow part of the tray, or is integrally compounded with the tray. In practical use, the tray preferably has a hollow structure, so that the catalyst and the VOCs can be contacted more fully. In order to avoid the influence caused by insufficient illumination, a heating unit is arranged in the bracket so as to realize electric heating under the condition of insufficient illumination, for example, a resistance wire, and a control element and/or a circuit matched with the resistance wire are arranged in the bracket or the base.

The base comprises a base body, and the top end of the base is connected with the cavity and the bracket; the whole base body is in a horn shape, so that the device can be stably placed on a plane on one hand, and the air inflow is increased on the other hand; the opening end (the end with a relatively large horn opening) of the horn of the base body is uniformly provided with grooves, so that relatively cold air can be sucked into the device from the bottom; the base buckle is uniformly arranged at the horn closing end (the end with a relatively small horn opening) of the base body so as to stably connect the cavities, and the base connecting end is arranged in the center of the horn closing end of the base body and is used for being connected with the bracket (a second connecting shaft of the bracket); a base support body is arranged between the base connecting end and the horn mouth end of the base body to form a hollow structure; additional components such as electrical wiring or small solar support cells are provided throughout the base structure to accommodate different applications.

The upper bracket comprises an upper bracket body, the bottom end of the upper bracket is connected with the cavity, and the top end of the upper bracket is connected with the first connecting shaft; the upper bracket body is integrally arranged in a horn shape, so that the device can be stably installed, gas is not easy to leak at a joint, and the air input is increased to maintain the flow rate of rising gas; the upper bracket buckles are uniformly arranged at the horn opening end (the end with the relatively large horn opening) of the upper bracket body so as to stably connect the cavities; an upper bracket connecting end is arranged in the center of a horn closing end (one end with a relatively small horn opening) of the upper bracket body and is used for being connected with a first connecting shaft; an upper bracket supporting body is arranged between the upper bracket connecting end 3 and the horn mouth end of the upper bracket body so as to form a hollow structure.

The top end rotating mechanism comprises ribs which are distributed in a spiral shape, a bearing seat is arranged in the central position of the top end rotating mechanism and is matched with the first connecting shaft for use so as to realize low-damping rotation or other movable/fixed connection modes of the top end rotating mechanism, the ribs change the direction of vertical ascending air flow into the horizontal direction and simultaneously drive the top end to rotate, peripheral air is further disturbed, and convection is promoted.

In the technical scheme of the invention, when the illumination is sufficient, the light penetrates through the cavity (plated with the infrared antireflection film) and is converged on the tray in the center of the cavity; the catalyst absorbs light and converts the light into heat, so that the temperature of the catalyst and the ambient air is increased, the air is heated and expanded to form ascending air flow, the fins at the top end are pushed to rotate, the hot air is thrown out from the opening at the top end, and the fresh low-temperature air is sucked in from the bottom, so that the convection stirring of the ambient air of the device is realized; the top end of the fixed connection can be used in the occasion with weak illumination, and the gas stirring can be realized by the flow guide of the fins; VOCs contained in the air are decomposed by photo-thermal catalysis while passing through the catalyst on the tray; the cavity is connected with the small-sized solar matched battery of the tray by utilizing the photovoltaic effect of the coating material on the cavity, when the illumination is sufficient, the cavity absorbs the ultraviolet part in the illumination to charge and store the electricity for the small-sized solar matched battery, and when the illumination is weakened, the small-sized solar matched battery discharges to realize the electric heating of the catalyst or the catalytic coating; if the tray is externally connected with a power supply, the wire connected with the tray can be connected with the external power supply through the USB port; the temperature of the catalyst layer is increased by an electric heating method, and the function of thermally catalytically degrading VOCs and promoting convection by heating air is realized.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention can solve the problems that the traditional VOCs degradation means only depends on the adsorption/degradation of VOCs molecules after the VOCs molecules are diffused to the surface of a degraded substance, the action range is limited, and the efficiency is poor.

2. The invention can be driven by sunlight and has no extra energy consumption.

3. The invention has certain inhibiting effect on virus, bacteria and other pathogens.

4. The device has the advantages of high integration degree, small occupied area, simple operation, no need of complex maintenance and low cost.

Drawings

FIG. 1 is an SEM photograph of MnO nanorods as a catalyst used in the present invention.

Fig. 2 is a schematic structural diagram of a photothermal-driven VOCs catalytic degradation device of the present invention, wherein 1 is a top end rotating mechanism, 2 is a first connecting shaft, 3 is an upper bracket connecting end, 4 is an upper bracket supporting body, 5 is an upper bracket body, 6 is a cavity, 7 is a bracket, 7-1 is a tray, 7-2 is a second connecting shaft, 8 is a base connecting end, 9 is a base supporting body, 10 is a base body, 11 is a base buckle, 12 is a bearing seat, 13 is a rib, and 15 is a groove.

Fig. 3 is a schematic structural diagram of an upper bracket in the photothermal drive VOCs catalytic degradation device of the present invention, wherein 3 is an upper bracket connection end, 4 is an upper bracket support body, 5 is an upper bracket body, and 14 is an upper bracket buckle.

Fig. 4 is a schematic structural diagram (1) of a top rotating mechanism in a photothermal-driven VOCs catalytic degradation device of the present invention, wherein 1 is the top rotating mechanism, 12 is a bearing seat, and 13 is a rib.

Fig. 5 is a schematic structural diagram (2) of a top rotating mechanism in a photothermal-driven VOCs catalytic degradation device of the present invention, wherein 1 is the top rotating mechanism, 12 is a bearing seat, and 13 is a rib.

FIG. 6 is a graphical representation of the infrared temperature measurements of the catalyst of the present invention under one sun's light intensity, wherein (a) is the catalyst macro-morphology; (b) the infrared temperature measurement result of the catalyst is obtained.

FIG. 7 is a graph of performance testing of VOCs degradation using the present invention.

Detailed Description

The following describes a specific embodiment of the present invention in detail with reference to the accompanying drawings.

As shown in fig. 1, the photothermal-driven catalytic degradation device for VOCs of the present invention comprises a top end rotating mechanism 1, a first connecting shaft 2, an upper bracket, a cavity 6, a bracket 7 and a base, wherein:

the top end rotating mechanism is connected with the upper support through a first connecting shaft, a cavity is arranged between the upper support and the base, and a bracket connected with the base is arranged in the cavity; the catalyst is arranged on the bracket and used for catalyzing and degrading VOCs, and the shape of the cavity is set to be a shape which is beneficial to converging light rays on the bracket, such as a nearly spherical shape. The technical scheme is explained in detail as follows:

The bracket 7 comprises a tray 7-1 and a second connecting shaft 7-2, the second connecting shaft is used for being connected with the base so as to realize stable connection, a catalyst is arranged on the tray, for example, the tray with a non-hollow structure is adopted, and the catalyst is arranged in a groove of the tray; if the tray with the hollow structure is adopted, the catalyst is arranged in a groove of a non-hollow part of the tray, or is compounded with a heat-resistant and breathable film of a hollow part of the tray, or is integrally compounded with the tray. In practical use, the tray preferably has a hollow structure, so that the catalyst and the VOCs can be contacted more fully. In order to avoid the influence caused by insufficient illumination, a heating unit is arranged in the bracket so as to realize electric heating under the condition of insufficient illumination, for example, a resistance wire, and a control element and/or a circuit matched with the resistance wire are arranged in the bracket or the base. The MnO nanorods are selected as the catalyst, and the morphology of the MnO nanorods is shown in figure 1.

The base comprises a base body 10, and the top end of the base is connected with the cavity and the bracket; the whole base body is in a horn shape, so that the device can be stably placed on a plane on one hand, and the air inflow is increased on the other hand; the open end of the horn of the base body (the end with the relatively large opening of the horn) is uniformly provided with grooves 15, so that relatively cold air can be sucked into the device from the bottom; a base buckle 11 is uniformly arranged at the horn closing end (the end with a relatively small horn opening) of the base body so as to stably connect the cavity 6, and a base connecting end 8 is arranged at the center of the horn closing end of the base body and is used for connecting with a bracket (a second connecting shaft of the bracket); a base support body 9 is arranged between the base connecting end 8 and the horn mouth end of the base body to form a hollow structure; additional components such as electrical wiring or small solar support cells are provided throughout the base structure to accommodate different applications.

The upper bracket comprises an upper bracket body 5, the bottom end of the upper bracket is connected with the cavity 6, and the top end of the upper bracket is connected with the first connecting shaft; the upper bracket body is integrally arranged in a horn shape, so that the device can be stably installed, gas is not easy to leak at a joint, and the air input is increased to maintain the flow rate of rising gas; the upper bracket buckles 14 are uniformly arranged at the horn opening end (the end with the relatively large horn opening) of the upper bracket body so as to stably connect the cavities 6; an upper bracket connecting end 3 is arranged in the center of a horn closing end (one end with a relatively small horn opening) of the upper bracket body and is used for being connected with a first connecting shaft; an upper bracket supporting body 4 is arranged between the upper bracket connecting end 3 and the horn mouth end of the upper bracket body so as to form a hollow structure.

The top end rotating mechanism comprises ribs 13 which are distributed in a spiral shape, a bearing seat 12 is arranged in the center of the top end rotating mechanism and is matched with the first connecting shaft for use so as to realize low-damping rotation or other movable/fixed connection modes of the top end rotating mechanism, the ribs 13 change the direction of vertical ascending air flow to be horizontal and simultaneously drive the top end 1 to rotate, peripheral air is further disturbed, and convection is promoted.

According to the technical scheme, the catalyst is loaded on a bracket (such as a tray), then the bracket 7, the cavity 6, the upper bracket and the top end rotating mechanism are sequentially assembled on a base, the whole stability of the device is ensured, the top end rotating mechanism 1 can smoothly rotate without shaking, and then the whole device is placed in a place with illumination, so that the VOCs driven by photothermal degradation can be realized. The catalyst can selectively catalyze and combust commonly used CeO_xCatalyst or MnO_xThe catalyst is a commercial product (can be purchased freely) and can be prepared according to the needs, and the preparation method belongs to the conventional means in the field of catalyst preparation or is prepared according to the prior art.

In a specific application of the actual generating device, the following method can be implemented:

first, the chamber 6 and the bracket 7 are cleaned by an ultrasonic cleaner and dried to prevent impurities such as dust attached to the surfaces of the chambers from affecting the coating.

And secondly, respectively and uniformly plating an anti-reflection film and a catalyst on the inner wall of the cavity 6 and the disc surface of the tray 7-1.

And thirdly, assembling the base, the bracket 7, the cavity 6 and the upper support in sequence, fixing the relative positions of the base, the cavity and the upper support by using a buckle, and adopting top rotating mechanisms (fins or paddles as shown in figures 4 and 5) of different styles according to use occasions.

And fourthly, connecting the electric wire of the bracket 7 with an external power supply or connecting the cavity 6 with the small-sized solar matched battery of the bracket 7 according to the use occasion and the requirement, and checking whether the top end rotating structure 1 rotates normally or not and whether the device is stable or not when the top end rotating structure 1 rotates.

And fifthly, putting the air purifier at a proper position to perform catalytic degradation on VOCs in the air.

The catalyst can adsorb and degrade VOCs, and the temperature of the catalyst is relatively high due to the photo-heating effect, so that the catalyst can keep high activity. Photothermal conversion performance was measured at a solar intensity (100 mW/cm)^-2) The procedure was followed using 1g of catalyst (MnO). Straight barThe catalyst is irradiated, the surface temperature of the catalyst can reach 82.7 ℃ within about 90s, and the catalyst tends to be stable when exceeding 110 ℃ within about 30 min. After the product (the cavity part is made of quartz glass, the tray part is made of temperature-resistant resin, and the rest part is made of tough resin) is used, the surface temperature of the catalyst can reach 95.4 ℃ under the same condition for 90s, is increased by 15%, exceeds 120 ℃ after 30min and tends to be stable, and the surface temperature of a device is always kept at room temperature in the test process, as shown in fig. 6. The VOC degradation experiment takes toluene as a representative VOCs substrate, the degradation performance is shown in figure 7, the toluene ignition temperature can be reduced to below 95 ℃ by using the catalyst and the MnO catalyst, and the temperature required by 10% degradation is only 120 ℃.

Embodiments of the present invention describe a device for the catalytic degradation of VOCs using photo-induced heating as the driving force. The ascending air flow is generated by the thermal effect of light, and the air convection is generated by the diversion of the fins at the top end of the device or the rotation of the air ball at the top end of the device, so that the molecular motion of VOCs is promoted. Through the local heating effect of light, the catalyst heats up rapidly on the shining lower surface of light, reaches the ignition temperature, and catalytic degradation VOCs keeps the bulk phase and device surface temperature lower simultaneously, reduces the potential safety hazard. Considering that most viruses and bacteria are sensitive to heat, lose infectivity under high temperature condition and shorten survival time, the catalyst with high surface temperature has certain inhibition effect on pathogens. The light which penetrates through the cavity and is converged is utilized to irradiate the catalyst in the center of the cavity and then is converted into heat, the air around the catalyst is heated to expand and rise, and the top end is guided or pushed to rotate by the top end; meanwhile, the heated surface of the catalyst reaches the ignition temperature of VOCs, and the VOCs are decomposed and converted. Based on the principle, the novel efficient VOCs degradation device is obtained, external electricity or mechanical energy is not needed, air convection can be driven only by illumination, and VOCs in a cavity are catalytically degraded.

The preparation of the catalytic degradation device can be realized by adjusting the process parameters according to the content of the invention, and the performance of the catalytic degradation device is basically consistent with that of the catalytic degradation device through tests. The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.

Claims

1. The utility model provides a driven VOCs catalytic degradation device generates heat to photoinduced, its characterized in that, includes top rotary mechanism, first connecting axle, upper bracket, cavity, bracket and base, wherein:

the top end rotating mechanism is connected with the upper support through a first connecting shaft, a cavity is arranged between the upper support and the base, and a bracket connected with the base is arranged in the cavity; the catalyst is arranged on the bracket and used for catalyzing and degrading VOCs, and the shape of the cavity is set to be a shape which is beneficial to converging light rays onto the bracket.

2. A photothermal drive VOCs catalytic degradation device according to claim 1, wherein the bracket comprises a tray, a second connecting shaft for connecting with the base to achieve a stable connection, and a catalyst disposed on the tray, such as a tray with a non-hollow structure, and disposed in the groove of the tray; if a tray with a hollow structure is adopted, the catalyst is arranged in a groove of a non-hollow part of the tray, or is compounded with a heat-resistant and breathable film of a hollow part of the tray, or is integrally compounded with the tray; in practical use, the tray preferably has a hollow structure, so that the catalyst and the VOCs can be contacted more fully. In order to avoid the influence caused by insufficient illumination, a heating unit is arranged in the bracket so as to realize electric heating under the condition of insufficient illumination, for example, a resistance wire, and a control element and/or a circuit matched with the resistance wire are arranged in the bracket or the base.

3. The apparatus of claim 1, wherein the base comprises a base body, and the top end of the base is connected to the chamber and the bracket; the whole base body is in a horn shape, so that the device can be stably placed on a plane on one hand, and the air inflow is increased on the other hand; the opening end (the end with a relatively large horn opening) of the horn of the base body is uniformly provided with grooves, so that relatively cold air can be sucked into the device from the bottom; the base buckle is uniformly arranged at the horn closing end (the end with a relatively small horn opening) of the base body so as to stably connect the cavities, and the base connecting end is arranged in the center of the horn closing end of the base body and is used for being connected with the bracket (a second connecting shaft of the bracket); a base support body is arranged between the base connecting end and the horn mouth end of the base body to form a hollow structure; additional components such as electrical wiring or small solar support cells are provided throughout the base structure to accommodate different applications.

4. The apparatus of claim 1, wherein the upper support comprises an upper support body, the bottom end of the upper support is connected to the chamber, and the top end of the upper support is connected to the first connecting shaft; the upper bracket body is integrally arranged in a horn shape, so that the device can be stably installed, gas is not easy to leak at a joint, and the air input is increased to maintain the flow rate of rising gas; the upper bracket buckles are uniformly arranged at the horn opening end (the end with the relatively large horn opening) of the upper bracket body so as to stably connect the cavities; an upper bracket connecting end is arranged in the center of a horn closing end (one end with a relatively small horn opening) of the upper bracket body and is used for being connected with a first connecting shaft; an upper bracket supporting body is arranged between the upper bracket connecting end 3 and the horn mouth end of the upper bracket body so as to form a hollow structure.

5. A photothermal drive VOCs catalytic degradation device as claimed in claim 1, wherein the top rotation mechanism comprises ribs distributed in a spiral shape, a bearing seat is disposed at the center and used in cooperation with the first connection shaft to realize low damping rotation or other movable/fixed connection of the top rotation mechanism, the ribs change the direction of the vertical ascending air flow to be horizontal and drive the top 1 to rotate to further disturb the surrounding air and promote convection.

6. The apparatus according to claim 1, wherein the chamber is substantially spherical or substantially cylindrical, and is made of transparent material such as quartz or acrylic; and an anti-reflection and anti-reflection coating is plated on the inner surface of the cavity to increase the transmission of infrared rays and increase the surface temperature of the catalyst.

7. A photothermal conversion driven catalytic degradation device of VOCs according to claim 1, wherein a coating with uv-vis photovoltaic response is disposed on the inner and/or outer surface of the chamber and connected to a small solar cell in a base to increase the solar utilization.

8. The device of claim 1, wherein the coating on the inner and/or outer surface of the chamber is one or more layers of coatings selected from magnesium fluoride, titanium dioxide, silicon dioxide, aluminum oxide, zirconium dioxide, zinc selenide, zinc sulfide, and other anti-reflective coating materials or photovoltaic materials.

9. Use of a photothermally activated catalytic degradation device of VOCs according to any of claims 1-8 for degrading VOCs.

10. Use of a device for the catalytic degradation of photothermally activated VOCs according to any of claims 1 to 8, wherein when sufficient light is applied, the light is transmitted through the chamber (coated with an infrared reflection reducing coating) and focused onto the tray in the center of the chamber; the catalyst absorbs light and converts the light into heat, so that the temperature of the catalyst and the ambient air is increased, the air is heated and expanded to form ascending air flow, the fins at the top end are pushed to rotate, the hot air is thrown out from the opening at the top end, and the fresh low-temperature air is sucked in from the bottom, so that the convection stirring of the ambient air of the device is realized; the top end of the fixed connection can be used in the occasion with weak illumination, and the gas stirring can be realized by the flow guide of the fins; VOCs contained in the air are decomposed by photo-thermal catalysis while passing through the catalyst on the tray; the cavity is connected with the small-sized solar matched battery of the tray by utilizing the photovoltaic effect of the coating material on the cavity, when the illumination is sufficient, the cavity absorbs the ultraviolet part in the illumination to charge and store the electricity for the small-sized solar matched battery, and when the illumination is weakened, the small-sized solar matched battery discharges to realize the electric heating of the catalyst or the catalytic coating; if the tray is externally connected with a power supply, the wire connected with the tray can be connected with the external power supply through the USB port; the temperature of the catalyst layer is increased by an electric heating method, and the function of thermally catalytically degrading VOCs and promoting convection by heating air is realized.