CN113351010A

CN113351010A - Plasma driven catalyst reactor and preparation method thereof

Info

Publication number: CN113351010A
Application number: CN202110226640.4A
Authority: CN
Inventors: 李伟文; 姜乐恒; 苏敬豪; 李家骏; 余家杰
Original assignee: Shi Weisha High Quality Air Co ltd
Current assignee: Shi Weisha High Quality Air Co ltd
Priority date: 2020-03-05
Filing date: 2021-03-01
Publication date: 2021-09-07
Also published as: WO2021175304A1; WO2021175304A9; TW202135868A

Abstract

A plasma-driven catalyst reactor (100) for purifying air comprising: at least two electrodes (102,104) for generating a plasma in a plasma region between the at least two electrodes (102, 104); wherein at least one of the electrodes (102,104) comprises a dielectric layer (112) and a catalyst layer (114), and wherein a fibrous member (108) containing a catalyst (110) for reducing harmful substances in the plasma zone is arranged between the electrodes (102, 104).

Description

Plasma driven catalyst reactor and preparation method thereof

Technical Field

The invention relates to the technical field of non-thermal plasma, in particular to a plasma-driven catalyst reactor for purifying air and a preparation method thereof.

Background

Air pollution is a major concern worldwide because it can have adverse health effects. The severity of the health hazard depends on the level of exposure, the time of exposure and the nature of the air pollutants. Health problems associated with air pollution include nose discomfort and throat irritation, asthma, blood pressure abnormalities, and cancer. Air pollutants include Particulate Matter (PM) or gaseous droplets in the air, such as mixtures of water, dust, dirt, smoke, and fumes. Gaseous pollutants, on the other hand, include Volatile Organic Compounds (VOCs), ozone, nitrogen dioxide, carbon monoxide, and the like.

Non-thermal plasma (NTP) has proven to be an effective method for decomposing gaseous pollutants, such as Volatile Organic Compounds (VOCs), chlorofluorocarbons (CFCs) and odorous gases. However, it has been found that plasma treatment alone can lead to the formation of undesirable by-products, such as ozone (O)₃) And carbon monoxide (CO). In addition, NTP technology has poor effect on removing PM substances, and thus, its application in air purification is limited.

In order to reduce the amount of PM and gaseous pollutants in the air, especially in indoor air, there are currently some advanced air purifiers. In these air purifiers, a high efficiency air filter (HEPA) and an activated carbon layer are installed together. HEPA is used to remove PM, and activated carbon layer is used to remove gas pollutants. However, there are several disadvantages to this arrangement. First, the use of HEPA typically results in a large pressure drop, thereby limiting the Clean Air Delivery Rate (CADR). Secondly, such a mixing and filtering device is bulky. Again, it has been reported that bacteria can adhere to the carbon particles of the activated carbon layer and cause contamination. Finally, and equally importantly, the purifiers described above require regular replacement of the HEPA and activated carbon layers, thereby increasing operating costs.

Therefore, it is highly desirable to develop an air purification device that can effectively reduce both PM and gaseous pollutant content.

Disclosure of Invention

In one aspect, the present invention provides a plasma-driven catalyst reactor for purifying air, the reactor comprising:

at least two electrodes for generating a plasma in a plasma region between the at least two electrodes,

wherein at least one of the electrodes comprises a dielectric layer and a catalyst layer, an

A catalyst-containing fibrous member disposed between the electrodes for reducing harmful substances in the plasma region.

In another aspect of the invention there is provided an apparatus comprising at least one plasma-driven catalyst reactor as described above. In particular, the device further comprises:

an air inlet and an air outlet for allowing air to pass through the plasma-driven catalytic reactor, and

a filter disposed upstream of the plasma-driven catalyst reactor for reducing particulates in air passing through the plasma-driven catalyst reactor.

In a further aspect the present invention provides a method of preparing a plasma-driven catalyst reactor as described above, the method comprising:

(i) providing at least two electrodes for generating a plasma in a plasma region between the at least two electrodes and forming a dielectric layer on at least one of the electrodes;

(ii) forming a catalyst layer on the dielectric layer; and

(iii) a fibrous member containing a catalyst is disposed between the electrodes.

Drawings

Embodiments of the invention are described in more detail below with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram showing a plasma-driven catalyst reactor according to one embodiment of the present invention;

FIG. 2 is a schematic diagram showing a plasma-driven catalyst reactor according to another embodiment of the present invention;

FIG. 3 is a schematic diagram showing an apparatus including the plasma-driven catalyst reactor shown in FIG. 1 according to an embodiment of the present invention;

FIG. 4 is a schematic diagram showing the steps of preparing a dielectric layer on an electrode according to one embodiment of the present invention;

FIG. 5 is a schematic diagram showing the steps of preparing a catalyst precursor mixture for forming a catalyst layer according to one embodiment of the present invention;

FIG. 6 is a schematic diagram showing a step of coating a catalyst on an electrode according to an embodiment of the present invention;

FIG. 7A shows a blend of Polyacrylonitrile (PAN) and 0.5 wt% TiO₂Scanning Electron Microscope (SEM) images of the prepared fibers;

FIG. 7B shows Polyacrylonitrile (PAN) and 2 wt% TiO₂SEM images of the fibers prepared;

FIG. 7C shows a blend of Polyacrylonitrile (PAN) and 9 wt% TiO₂SEM image of the prepared fiber.

Detailed Description

The present invention relates to a plasma-driven catalyst reactor which generates plasma between electrodes for decomposing pathogens and removing air pollutants from air passing through the plasma-driven catalyst reactor, thereby purifying air to improve indoor air quality. The present invention relates to Dielectric Barrier Discharge (DBD) -based non-thermal plasma technology and similar concepts of this technology are described in US9,138,504 and US2016/0030622A, the entire disclosures of which are incorporated herein by reference.

In the present invention, preferably, at least one electrode of the plasma-driven catalyst reactor is coated with a dielectric layer, which may be, for example, a metal oxide layer, and a catalyst layer. The dielectric layer and the catalyst layer on the electrodes together improve the removal efficiency of pollutants in the air. Further, a fibrous member containing a catalyst is also disposed between the electrodes to facilitate the purification process. The catalyst in the fibrous member may be activated by the generated plasma and then decompose the contaminants in the air. The fibrous structure of the fibrous member provides a greater surface area for the catalytic reaction.

As shown in fig. 1, the present invention illustratively provides an embodiment, a plasma-driven catalyst (abbreviated PDC) reactor 100. The PDC reactor 100 has two

electrodes

102 and 104 arranged in parallel for generating plasma in a plasma region between the

electrodes

102 and 104; and a fibrous member 108 disposed within the plasma region, the fibrous member 108 being disposed between the electrode 102 and the electrode 104 and parallel to the electrode 102 and the electrode 104 for reducing harmful substances in the plasma region. The

electrodes

102 and 104 are connected to a power source 106, preferably, the power source 106 is an Alternating Current (AC) power source operable to provide an alternating voltage. High voltage AC of 3kV to 30kV, in the frequency range between several hundred hertz (Hz) to several hundred kilohertz (kHz), particularly between about 0.1 kHz to about 30.0 kHz, may be provided to generate plasma within the PDC reactor 100.

The

electrodes

102 and 104 are made of a conductive material and are configured in a mesh form. The mesh structure increases the surface area for generating plasma. It should be understood that other configurations of electrodes may also be used in the present invention to achieve the same or similar performance as described herein. For example, the

electrodes

102 and 104 may be in the form of a membrane, rod, plate, or tube. In one embodiment, the electrode has a zigzag structure. The PDC reactor may have more than two electrodes arranged parallel to each other to increase the generation of plasma.

Preferably, the

electrodes

102 and 104 are spaced from each other by a distance of 0.5mm to 10mm, or 1mm to 5mm, or 1.5mm to 3 mm. The electrode 102 is coated with a dielectric layer 112. The generated plasma can effectively fill the space between the electrodes, decomposing pathogens in the air passing through the space. Within the above distance, the efficiency of removing Volatile Organic Compounds (VOCs) was found to be greatest. The dielectric layer 112 partially or completely covers the surface of the electrode 102 and participates in the generation of plasma. Further, the dielectric layer 112 of the present invention may also serve as an interfacial layer on the surface of the electrode. Thus, the dielectric layer 112 provides a surface that can be used to load a functional ingredient, such as a catalyst or a molecule capable of altering the physical or electrical properties of the electrode 102.

In this embodiment, the dielectric layer 112 contains cerium oxide. The cerium oxide may be Ce₂O₃、Ce₃O₄Or CeO₂. Preferably, the cerium oxide is CeO₂. The dielectric layer 112 may be formed on the surface of the electrode 102 by a metal conversion process, which will be described in detail below. In another embodiment, additional dielectric elements may be placed in contact with the electrode 102 to enhance plasma generation.

On top of the dielectric layer 112, the electrode 102 has an additional catalyst layer 114. In other words, the dielectric layer 112 is disposed between the electrode 102 and the catalyst layer 114. The catalyst layer 114 has a surface exposed to the plasma region. The catalyst layer 114 includes one or more catalysts, particularly photocatalysts, to degrade contaminants under appropriate excitation. Preferably, the catalyst layer 114 comprises titanium oxide, which is a promising photocatalyst for reducing gaseous contaminants and undesirable byproducts generated during plasma generation. The catalyst can be effectively activated by the plasma generated in the plasma region. The energetic species generated by the PDC reactor 100 can react with ozone (an undesirable byproduct) in the presence of a catalyst to form oxygen radicals, hydroxyl radicals, and hydrogen peroxide, thereby eliminating or reducing ozone and other contaminants in the air.

It has been found that the combination of a dielectric layer comprising cerium oxide and a catalyst layer comprising titanium dioxide significantly improves the efficiency of removal of, for example, volatile organic contaminants from air.

As shown in fig. 1, the PDC reactor 100 also has a fiber member 108 disposed parallel to the

electrodes

102 and 104. The fibrous member 108 contains one or more catalysts 110 to further enhance the efficiency of contaminant removal. Preferably, the fibrous member 108 contains electrospun fibers (not shown in the figures), or the fibrous member 108 consists of electrospun fibers that contain a quantity of the catalyst 110. It should be understood that the fibrous member 108 comprises a polymer selected from at least one of polyvinylidene fluoride (PVDF), Polyacrylonitrile (PAN), and combinations thereof, and at least one catalyst, such as titanium dioxide. In one embodiment, the fibrous member is made from a mixture containing Polyacrylonitrile (PAN) and titanium dioxide by an electrospinning process under conditions to produce nano-to micro-sized fibers.

Preferably, the fibers have an average diameter of about 50nm to 2000nm, about 100nm to 1000nm, about 200nm to 800nm, or about 400nm to 600 nm. The fibrous member 108 may contain additives that may adjust the fiber morphology, diameter, thickness, and/or density of the fibrous member 108. For example, as the fiber diameter decreases, the fibrous member may provide more surface area for catalytic reactions to occur and enhance the adsorptive and filtration properties of the fibrous member. Furthermore, the fibrous porous structure of the fibrous member 108 is advantageous in that it can serve as a filter that traps particles in the air.

The catalyst 110 may be present in the fibrous member 108 in an amount of from about 4 to about 60 weight percent, from about 10 to about 50 weight percent, from about 20 to about 40 weight percent, or about 50 weight percent, based on the total weight of the fibrous member 108. In the present embodiment, the titanium dioxide is present in an amount of about 50 weight percent based on the total weight of the fibrous member 108.

In this embodiment, the catalyst layer 114 and the fibrous member 108 comprise the same catalyst, such as titanium dioxide. It should be understood that other catalysts suitable for degrading gaseous contaminants are also suitable for use in the present invention. For example, heteroj unction photocatalysts (heteroj unction photocatalysts) capable of accelerating the activation process are included. In another embodiment, the catalyst layer and the fibrous member may contain different catalysts to purify the air.

Accordingly, in accordance with an embodiment of the present invention, the PDC reactor 100 has a combined arrangement of a fiber member 108 and at least one double coated electrode. As air enters the PDC reactor 100, the plasma generated between the

electrodes

102 and 104 will activate the catalyst in the catalyst layer 114 and the fibrous member 108 to degrade and remove harmful substances in the air. Thus, the discharged air is purified. The above combination arrangement has proven effective in enhancing the removal of gaseous contaminants such as ozone. The PDC reactor 100 can be used with other components to form a device.

According to the invention, the PDC reactor may comprise more than one double coated electrode, i.e. an electrode coated with both a dielectric layer and a catalyst layer as described above. It should be understood that various combinations of electrodes may also be used to form PDC reactors. For example, a PDC reactor may include more than two double-coated electrodes and more than one uncoated electrode disposed substantially parallel to each other.

FIG. 2 schematically illustrates a PDC reactor 200 in accordance with another embodiment of the present invention. The PDC reactor 200 is similar to the PDC reactor 100 shown in fig. 1, except that the PDC reactor 200 includes two electrodes, an electrode 202 and an electrode 204, wherein the electrode 202 is coated with a dielectric layer 212a and a catalyst layer 214 a; the electrode 204 is coated with a dielectric layer 212b and a catalyst layer 214 b. The

electrodes

202 and 204 are connected to a power source 206 to generate plasma between the

electrodes

202 and 204. The plasma activates the catalyst layer 214a and the catalyst layer 214b to decompose the contaminants. The PDC reactor 200 also includes a fiber member 208 disposed between the

electrodes

202 and 204 and substantially parallel to the

electrodes

202 and 204. The catalyst 210 in the fiber member 208 is activated by the plasma to remove particulate matter from the air.

As shown in fig. 3, an apparatus 300 of the present invention is provided. The apparatus 300 comprises a closed arrangement of the PDC reactor 100 as described above. The apparatus 300 also includes an air inlet 302, an air outlet 304, the air inlet 302 and the air outlet 304 allowing air to pass through the PDC reactor 100, and a filter 306 disposed upstream of the PDC reactor 100 for removing coarse particles from the air passing through the PDC reactor 100. An electric ventilator 308 is disposed downstream of the PDC reactor 100, drawing air in direction a into the air inlet 302 and out the air outlet 304. The device 300 may be equipped with more than one sensor, processor and/or controller to monitor and control contaminant levels. The apparatus 300 may also include a display for displaying the contaminant levels measured before and/or after plasma processing.

Experiments were conducted to investigate the efficiency of air contaminant removal using an apparatus comprising a PDC reactor as described above. In particular, the PDC reactor includes a double-coated electrode and an uncoated electrode. The double-coated electrode comprises a cerium oxide layer and TiO₂And (3) a layer. The double-coated electrode and the uncoated electrode are both connected with an alternating current power supply which can provide alternating current for the electrodes. Will contain TiO₂A nanofiber doped fiber member is disposed within the plasma zone of the PDC reactor. The PDC reactor is enclosed with an electric ventilator disposed downstream for generating the gas flow. Volatile Organic Compound (VOC) gas is then passed into the device and the VOC concentration in the device is monitored with a VOC meter. When the VOC concentration reaches equilibrium, the PDC reactor is started. After 65 minutes, the final VOC concentration was measured to calculate the air pollutant removal efficiency. Three experiments were carried out with the PDC reactor of the invention with or without a fiber member. A control experiment using a bare electrode (i.e., no coating, no fibrous member) was also set.

Table 1 shows the VOC removal efficiency of the device of the present invention compared to the control experiment.

Electrode for electrochemical cell	Presence or absence of fibrous member	Operating voltage (kV)	VOC dissociation (%)
				Bare metal mesh as electrode	Is free of	4	22.6
Double-coated electrode and uncoated electrode	Is free of	4	26.5
				Double-coated electrode and uncoated electrode	Is provided with	4	34.0

Based on the above experimental results, the PDC reactor of the present invention provides the highest VOC removal efficiency with the fibrous member. This result illustrates TiO in the plasma₂The higher the content of (b), the higher the removal efficiency of VOC can be obtained.

Further experimental studies were conducted to treat the ozone level of air with the PDC reactor of the present invention. Ozone monitors are used to measure the concentration of ozone in the device as described previously. The PDC reactor was placed next to the ozone monitor in the apparatus. Three experiments were carried out with the PDC reactor of the invention with or without a fiber member. A control experiment using a bare electrode (i.e., no coating, no fibrous member) was also set. Initial ozone concentrations were measured prior to starting the PDC reactor and final ozone concentrations were measured after 10 minutes of treatment, with the results shown in table 2.

Table 2 shows the ozone removal efficiency of the device of the present invention compared to the control experiment.

From the results, a by-product (O) was produced from the PDC reactor after treatment with the coated electrode₃) Less. It is also believed that the application of the cerium oxide layer enhances the TiO₂The doping amount of (a). As a result, less O was detected₃. The PDC reactor contains a fibrous member that further suppresses O₃The concentration of (c). The results show that TiO in the PDC reactor₂Doped fiber suppression of O₃Is useful, accordingly, because of the catalytic TiO₂Active substances can be generated to decompose harmful byproducts, and the PDC reactor of the present invention can suppress the release of harmful byproducts.

Furthermore, providing the fibrous member 108 between the

electrodes

102 and 104 in the PDC reactor 100 has proven to be a good effect in filtering air particles. Experiments were conducted to evaluate the filtration efficiency of the PDC reactor of the invention. Particulate Matter (PM) of different particle sizes is produced by the particle generator MAG 3000. The apparatus 300 is used to collect the generated PM. After 5 minutes of PM introduction, the device 300 was sealed and left at room temperature for 5 minutes to ensure uniform PM separation. The device 300 was connected to a Dusk Trak aerosol monitor. The nanofibers are disposed between the device 300 and a Dusk Trak aerosol monitor to provide filtration of PM from the device 300. The initial PM concentration and final PM concentration (after passing through the nanofibers) were measured and used to calculate filtration efficiency, with the results shown in table 3.

Table 3 shows the PM removal efficiency of the apparatus of the present invention compared to the control experiment.

Based on the results, the fiber members 108 in the PDC reactor 100 can effectively capture PM. The filtration efficiency depends on the fiber diameter, TiO₂Content of (a) and choice of polymer. By adjusting fiber diameter and TiO₂Can prepare different nano-fibers to meet different air purification requirementsAnd (4) a target.

Further experiments were conducted to determine the disinfection effect of the PDC reactor 100. 1mL of the E.coli culture was added to an LB agar plate. The agar plates were then placed in sealed boxes. In this sealed box, the PDC reactor was placed beside the agar plate. The PDC reactor was started for 45 minutes. Thereafter, the agar plate was removed and incubated at 37 ℃ for 24 hours. The bacteria in the agar plates were counted by conventional plate counting. Untreated agar plates were used as a control group. The results are shown in Table 4. The reduction rate of the test microorganisms in the test tube with the fibrous member was calculated using the following formula:

R％＝100*(A-B)/A

where R is the percent reduction of the test microorganism, A is the total number of colonies on the control agar plate, and B is the total number of colonies on the PDC-NF treated agar plate.

Table 4 shows the number of bacterial colonies treated with and without the PDC reactor.

	Control group	Treatment with PDC reactor	Reduction ratio (%)
				Bacterial colony count	2614	24	99.1

As can be seen from the above results, the control group did not exhibit any antibacterial activity, and the PDC reactor was able to effectively reduce and inhibit the growth of bacteria. The results demonstrate the disinfection effect of the PDC reactor of the present invention.

The invention also discloses a method for preparing the PDC reactor, which comprises the following steps:

(i) providing at least two electrodes for generating a plasma in a plasma region between the at least two electrodes and forming a dielectric layer as described above on at least one of the electrodes;

(ii) forming a catalyst layer as described above on the dielectric layer; and

(iii) a fibrous member containing a catalyst is disposed between the electrodes, the fibrous member being as described above.

Preferably step (i) comprises depositing a first mixture comprising cerium nitrate on at least one electrode and annealing to form a cerium oxide layer on the electrode. The first mixture may be deposited on the surface of the electrode by spraying, dipping, brushing, or dipping, depending on the material and structure of the electrode. The cerium nitrate on the surface of the electrode is then converted to cerium oxide by oxidation under suitable reaction conditions including annealing the electrode at a temperature above 200 ℃.

Fig. 4 shows an embodiment of a method for coating an electrode with a dielectric layer. The electrode 402 is immersed in Ce (NO) containing cerium (III) at room temperature₃)₃And an oxidizing agent, particularly hydrogen peroxide, for about 12 hours. The electrode 402 is then subjected to calcination at a temperature of 200 ℃ or higher for 30 minutes to form a cerium oxide layer 406 on the surface thereof. The cerium oxide layer 406 serves as a dielectric layer to aid in plasma generation and an interface layer to increase catalyst loading.

Preferably, the catalyst layer is formed using a sol-gel method. Step (ii) comprises depositing a catalyst precursor mixture on the formed dielectric layer and annealing to form a catalyst layer on the dielectric layer. In one embodiment, the catalyst is titanium dioxide and the catalyst precursor mixture comprises titanium isopropoxide.

Fig. 5 and 6 show one embodiment of the step of forming a catalyst layer on the dielectric layer after step (i). Catalyst precursor mixture 410 is prepared using both mixture a and mixture B. The preparation of mixture a is as follows: mixing 10-20 wt% Triton X-100, 65-85 wt% cyclohexane and 0.1-5 wt% water at room temperature, and stirring for 10 min; 5-20% by weight of 1-hexanol was then added to the mixture at room temperature and stirring was continued for 1 hour. The preparation of mixture B was as follows: 5-10% by weight of acetylacetone, 40-60% by weight of 1-hexanol, and 30-50% by weight of titanium isopropoxide were mixed, and then the mixture was stirred at room temperature for 10 minutes. Thereafter, the mixture a was added dropwise to the mixture B while stirring at room temperature for 90 minutes, to obtain a catalyst precursor mixture 410.

As shown in fig. 6, the electrode 402 coated with the cerium oxide layer 406 in step (i) is immersed in the catalyst precursor mixture 410 for a certain period of time and then dried, and calcined at 200 ℃ for 30 minutes. The electrode 402 is then calcined at a temperature of about 500 c for 2 hours to form a catalyst layer 412 on top of the cerium oxide layer 406. Accordingly, the electrode 402 coated with the cerium oxide layer 406 and the catalyst layer 412 is obtained.

In step (iii), preferably, the fibrous member is manufactured using an electrospinning technique. In the electrospinning process, a high voltage is applied to the polymer solution to produce fibers. The catalyst may be impregnated into electrospun fibers for participating in filtering air contaminants, such as VOC contaminants.

Preferably, step (iii) comprises mixing at least one polymer and a catalyst to obtain a second mixture, and then electrospinning said second mixture to obtain fibers for preparing said fibrous member. The polymer is selected from at least one of polyvinylidene fluoride (PVDF), Polyacrylonitrile (PAN), and combinations thereof, and the catalyst is preferably titanium dioxide. The amount of polymer and catalyst can be determined by one skilled in the art by selecting an appropriate method depending on the diameter and thickness of the desired fiber.

Alternatively, other polymers suitable for electrospinning can also be used or added to the second mixture. Other additives that can adjust the electrospinning product, such as additives that can change the fiber properties, can be added as desired. It may also be introduced into the fibrous member by adding additional catalyst to the second mixture prior to the electrospinning process.

Preferably, the coating can be formed by mixing 0.1 to 20 wt% of TiO₂The granules, 1-20 wt% polyacrylonitrile and 60-98.9 wt% dimethylformamide are mixed to prepare a second mixture. FIGS. 7A, 7B, and 7C show 0.5 wt% TiO prior to electrospinning from polyacrylonitrile₂2% by weight of TiO₂Or 9% by weight of TiO₂Three Scanning Electron Microscope (SEM) images of the fibrous member produced by addition to the second mixture.

In one embodiment of the invention, the composition is prepared by mixing 9 wt% TiO₂The granules, 9 wt% polyacrylonitrile and 82 wt% dimethylformamide were mixed to prepare a second mixture. During the electrospinning process, the distance between the needle tip and the collector was adjusted to 15 cm. During spinning, the feed rate of the second mixture was kept constant at 3 mL/h. Thus, a high voltage power supply applied 30kV generated an electric field between the needle tip and the collector. By collecting TiO-doped on the surface of non-woven cotton₂The electrospun fibers produce a fibrous structure. The inventor of the invention finds that the arrangement of the fiber component in the PDC reactor can obviously improve the purification effect of the reactor, and particularly can decompose more gas pollutants under the action of plasma activation.

It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the invention as shown in the specific embodiments without departing from the scope of the invention as broadly described. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.

Any reference to prior art contained herein is not to be taken as an admission that the information is common general knowledge, unless otherwise indicated.

Claims

1. A plasma-driven catalyst reactor for purifying air, the reactor comprising:

wherein at least one of the electrodes is coated with a dielectric layer and a catalyst layer, and

wherein a catalyst-containing fibrous member is disposed between the electrodes, the fibrous member for reducing harmful substances in the plasma region.

2. The plasma-driven catalyst reactor according to claim 1, wherein the fiber member is made of fibers having an average diameter of 50nm to 2000 nm.

3. The plasma-driven catalyst reactor according to claim 1, wherein the fibrous member comprises at least one polymer selected from the group consisting of polyvinylidene fluoride, polyacrylonitrile, and combinations thereof.

4. The plasma-driven catalyst reactor according to claim 1, wherein the fibrous member comprises from 4 wt% to 60 wt% of the catalyst based on the total weight of the fibrous member.

5. The plasma-driven catalyst reactor of claim 1, wherein the catalyst is a photocatalyst.

6. The plasma-driven catalyst reactor of claim 1, wherein the catalyst is titanium dioxide.

7. The plasma-driven catalyst reactor according to claim 1, wherein the catalyst layer comprises titanium dioxide.

8. The plasma-driven catalyst reactor according to claim 1, wherein the electrodes and the fibrous member are disposed parallel to each other.

9. The plasma-driven catalyst reactor of claim 1, wherein the electrodes are connected to an alternating current power source for providing an alternating voltage of 3-30 kilovolts at a frequency of 0.1-30 kilohertz.

10. The plasma-driven catalyst reactor according to claim 1, wherein the dielectric layer comprises cerium oxide.

11. The plasma-driven catalyst reactor of claim 1, wherein the dielectric layer comprises CeO₂。

12. The plasma-driven catalyst reactor of claim 1, wherein the dielectric layer is coated on the at least one electrode and the catalyst layer is formed on the dielectric layer, the catalyst layer having a surface exposed to the plasma region.

13. The plasma-driven catalyst reactor according to claim 1, wherein the electrodes are arranged parallel to each other and spaced apart from each other by a distance of 0.5mm to 10 mm.

14. A method of preparing a plasma-driven catalyst reactor according to any one of claims 1 to 13, comprising the steps of:

(ii) forming a catalyst layer on the dielectric layer; and

15. The method of claim 14, wherein the dielectric layer comprises cerium oxide.

16. The method of claim 14, wherein step (i) comprises depositing a first mixture comprising cerium nitrate on the at least one electrode and annealing to form a cerium oxide layer on the electrode.

17. The method of claim 14, wherein step (ii) comprises depositing a catalyst precursor mixture on the dielectric layer and annealing to form the catalyst layer on the dielectric layer.

18. The method of claim 14, wherein step (iii) comprises mixing at least one polymer and the catalyst to provide a second mixture, and then electrospinning the second mixture to provide the fibers forming the fibrous member.

19. The method of claim 18, wherein the polymer is selected from at least one of polyvinylidene fluoride (PVDF), Polyacrylonitrile (PAN), and combinations thereof.

20. The method of claim 14, wherein the catalyst is titanium dioxide.

21. The method of claim 18, wherein the fibers have an average diameter of 50nm to 2000 nm.

22. The method of claim 14, wherein the fibrous member comprises 4-60 wt% of the catalyst based on the total weight of the fibrous member.

23. The method of claim 14, wherein the fibrous member is disposed parallel to the electrode.