Core-shell catalysts for plasma adsorption-catalysis, their preparation methods and applications
By preparing an ultrafine nano-metal-anchored core-shell structure catalyst, the problem of insufficient catalyst performance in plasma adsorption-catalysis technology was solved, realizing the application of efficient VOCs degradation and porous structure, which is suitable for the treatment of different VOCs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NANJING UNIV
- Filing Date
- 2024-04-30
- Publication Date
- 2026-06-30
AI Technical Summary
In existing plasma adsorption-catalysis technologies, catalysts often lack both high adsorption and high catalytic performance, resulting in low VOCs degradation efficiency.
A core-shell structure catalyst anchored by ultrafine nano-metals, with a core layer of Mn-NaY and a shell layer of Mn-MCM-41, was prepared by ion exchange and impregnation methods to form a catalyst with multiple pore structures, which combined micro-discharge and long and short lifetime reactive oxygen species for synergistic catalysis.
It improves the degradation effect of VOCs in the plasma adsorption-catalysis system, has high catalytic and adsorption performance, and is highly controllable, making it suitable for the removal of different VOCs.
Smart Images
Figure CN118454727B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of VOCs treatment and catalyst technology, specifically relating to an ultrafine nano-metal-anchored core-shell structure catalyst for VOCs treatment in a plasma adsorption-catalysis system, its preparation method, and its application. Background Technology
[0002] Volatile organic compounds (VOCs) are a class of organic substances that easily evaporate into the atmosphere and participate in atmospheric photochemical reactions. They are one of the main causes of air pollution. VOCs participate in photochemical reactions in the atmosphere to produce ozone and aerosols, exacerbating the formation of smog and photochemical smog, severely impacting air quality, and posing a serious threat to the environment and human health. VOC emissions mainly originate from industrial production, transportation, and the use of chemicals.
[0003] To effectively control VOC emissions, plasma adsorption-catalysis technology has been proposed as a potential solution. In this technology, VOC molecules are first efficiently adsorbed using catalysts with high adsorption performance, such as porous materials. Subsequently, in the synergy of discharged plasma, the adsorbed VOC molecules are catalytically degraded into harmless products, such as carbon dioxide and water. This technology is a comprehensive VOC treatment technology integrating plasma, adsorption, and catalytic oxidation. It can efficiently capture and convert VOCs at relatively low temperatures, offering advantages such as high efficiency, environmental friendliness, and low energy consumption, and shows promising application prospects in the field of VOC treatment.
[0004] The plasma adsorption-catalysis technology, characterized by adsorption followed by catalytic oxidation, places high demands on catalyst selection. The catalyst must possess both strong adsorption and catalytic capabilities. Conventional catalysts in this technology often consist of porous adsorbent materials and active components supported on them. However, porous materials with a single pore structure often fail to simultaneously meet the high requirements of this system for both catalytic and adsorption performance. Summary of the Invention
[0005] To address the shortcomings of existing technologies, this invention provides an ultrafine nano-metal-anchored core-shell catalyst with multiple pore structures for adsorbing and degrading VOCs in a plasma system, along with its preparation method and application. This catalyst can solve the problems in plasma adsorption-catalysis technology where catalysts are difficult to simultaneously possess high adsorption performance and high catalytic performance, resulting in low VOCs degradation efficiency.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A core-shell catalyst for plasma adsorption-catalysis, wherein the core layer of the core-shell catalyst is Mn-NaY and the shell layer of the core-shell catalyst is Mn-MCM-41; wherein Mn-NaY is NaY anchored with ultrafine nano-manganese metal clusters; and Mn-MCM-41 is MCM-41 loaded with nano-manganese metal clusters.
[0008] Preferably, the core layer is physically covered by the shell layer.
[0009] Preferably, the Mn-NaY is prepared by ion exchange.
[0010] Preferably, the Mn-MCM-41 is prepared by impregnation.
[0011] Micron-sized pores exist between the particles of the core-shell catalyst.
[0012] The present invention also provides a method for preparing the core-shell catalyst for plasma adsorption-catalysis, comprising the following steps:
[0013] (1) Mn-NaY is immersed in silica sol and then uniformly mixed with Mn-MCM-41 powder, so that Mn-MCM-41 forms a shell on the surface of Mn-NaY to obtain a precursor; Mn-NaY is NaY anchored with ultrafine nano-manganese metal clusters; Mn-MCM-41 is MCM-41 loaded with nano-manganese metal clusters;
[0014] (2) The precursor was calcined at 400–550 °C to obtain the catalyst. The obtained catalyst was labeled as Mn-NaY@Mn-MCM-41.
[0015] Preferably, the mass ratio of Mn-MCM-41 to Mn-NaY is 1:1 to 3.
[0016] Preferably, steps (1) to (2) are repeated 1 to 3 times.
[0017] Preferably, the calcination time in step (2) is 2 to 3 hours and the heating rate is 2 to 10 °C / min.
[0018] Preferably, the Mn-NaY is obtained by ion exchange. More preferably, the Mn-NaY is obtained by the following method:
[0019] (0-1) Disperse NaY molecular sieve in Mn 2+ After stirring in an aqueous solution for 16–36 h, centrifugation was performed to obtain Mn-NaY.
[0020] Preferably, the Mn 2+ The aqueous solution is Mn(NO3)2 aqueous solution.
[0021] Preferably, the particle size of the NaY molecular sieve is 200–500 μm. The Si / Al ratio of NaY is not limited.
[0022] Preferably, the Mn 2+ The concentration is 0.5–5 mmol / L.
[0023] Preferably, the mass ratio of Mn element to NaY molecular sieve in step (0-1) is less than 1%.
[0024] Preferably, step (0-1) further includes centrifugation followed by washing and drying; more preferably, the drying is air drying at room temperature.
[0025] Preferably, the Mn-MCM-41 is obtained by an impregnation method. More preferably, the Mn-MCM-41 is obtained by the following method:
[0026] (0-2) The dried MCM-41 molecular sieve was impregnated with ethylene glycol and Mn. 2+ The mixture is placed in a mixed aqueous solution for 10–16 hours, and then dried to obtain a solid material; the solid material is then calcined at 350–450°C to obtain the final product.
[0027] Preferably, the particle size of the MCM-41 molecular sieve is 5 to 10 μm.
[0028] Preferred, Mn 2+ The molar ratio with ethylene glycol is 1:1.
[0029] Preferably, the impregnation method described in step (0-2) is equal volume impregnation.
[0030] Preferably, the mass ratio of Mn element to MCM-41 molecular sieve in step (0-2) is less than 10 wt%.
[0031] Preferably, the drying conditions in step (0-2) are drying at 80-100°C for 10-12 hours.
[0032] Preferably, the calcination time in step (0-2) is 5-7 hours, and the heating rate is 2-10 °C / min.
[0033] The present invention further provides the application of the core-shell catalyst for plasma adsorption-catalysis in the adsorption-catalytic degradation of VOCs by synergistic plasma.
[0034] Preferably, the application includes: placing the core-shell catalyst in the discharge region of a plasma reactor, introducing a gas to be treated containing VOCs, and adsorbing it without electricity; then introducing a reaction gas without VOCs, and adjusting the discharge voltage and power to degrade the VOCs at room temperature and pressure.
[0035] Furthermore, the plasma reactor is a DBD reactor, which uses a quartz glass tube with an outer diameter of 10 mm and an inner diameter of 8 mm as the medium, the discharge zone is 30 mm long, the inner electrode is a stainless steel tube with a diameter of 3 mm, the inner electrode is located in the middle of the DBD reactor, and the outer electrode is wrapped with a copper mesh.
[0036] Preferably, the distance between the inner electrode and the outer electrode is 5 mm.
[0037] Furthermore, the VOC-free reaction gas is a mixture of nitrogen and oxygen. More preferably, the volume ratio of nitrogen to oxygen is 4:1.
[0038] The construction of core-shell structures affects the microstructure and performance of catalysts. Catalysts with both micropores and mesopores have strong application prospects in the direction required by plasma adsorption-catalysis technology.
[0039] When a catalyst has micron-sized pores, micro-discharges can be generated inside the pores, which helps to improve the plasma catalytic activity.
[0040] Regarding the active components, manganese oxides exhibit easily tunable catalytic activity and are relatively inexpensive as non-precious metal oxides. Compared to conventional supported metals, ultrafine nano-metals possess advantages such as high catalytic activity, high selectivity, and high tunability due to size effects and geometric constraints, making them more valuable for applications in plasma catalysis. Based on this, the manganese-based core-shell structure catalyst anchored with ultrafine nano-metals possessing multiple pore structures developed in this invention has significant potential value, and its development will contribute to the efficient degradation of VOCs under low-temperature conditions.
[0041] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0042] (1) The core-shell structure catalyst with ultrafine nano-metal anchoring prepared in this invention has a core of NaY microporous molecular sieve anchored with ultrafine nano-metal manganese clusters by ion exchange method, which has the dual function of adsorbing VOCs and catalyzing by utilizing long-lived reactive oxygen species (ROS); the outer shell is a mesoporous molecular sieve MCM-41 loaded with nano-metal manganese clusters by impregnation method. Micrometer-level channels exist between MCM-41, which can synergistically catalyze by utilizing short-lived ROS and NTP, and can also generate micro-discharge in the micrometer-level channels to enhance the discharge intensity and promote ozone generation.
[0043] (2) The ultrafine nano-metal anchored core-shell structure catalyst prepared by this invention has both high catalytic performance and adsorption performance, which can effectively improve the degradation effect of VOCs in the plasma adsorption-catalysis system.
[0044] (3) The ultrafine nano-metal anchored core-shell structure catalyst prepared by the present invention has high controllability. By adjusting the raw material ratio, reaction conditions, etc., the shell thickness, pore structure, metal activity, etc. of the catalyst can be changed, and it can be applied to the removal of different types of VOCs under different conditions.
[0045] (4) The core-shell structure of the present invention is formed by physical coating method, which is simple to prepare, has low technical requirements, and is highly scalable. Attached Figure Description
[0046] The accompanying drawings, together with the embodiments of the present invention, are used to explain the present invention and do not constitute a limitation thereof.
[0047] Figure 1 This is a schematic diagram of the structure of the core-shell catalyst prepared in this invention.
[0048] Figure 2 This is a TEM image of the core-shell catalyst prepared in Example 1 of the present invention.
[0049] Figure 3 This is the H2-TPR diagram of the core-shell catalysts prepared in Examples 1 and 2 of this invention. Detailed Implementation
[0050] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are not limited thereto; for process parameters not specifically specified, conventional techniques can be referred to. If those skilled in the art, inspired by this application, design similar structural methods and embodiments without departing from the spirit of this application, such designs should fall within the protection scope of this application.
[0051] Example 1
[0052] (1) Take 1 g of ~300 μm NaY into 20 ml of 1 mmol / L Mn(NO3)2 solution and stir at room temperature for 24 h;
[0053] (2) Wash with deionized water by centrifugation and air dry at room temperature to obtain NaY (Mn-NaY) anchored to ultrafine nano-manganese metal clusters;
[0054] (3) Take 422 μl of 50% manganese nitrate, 101.4 μl of ethylene glycol, and 11.5 ml of deionized water and mix them to impregnate 2 g of dried ~5 μm MCM-41.
[0055] (4) After standing at room temperature for 12 hours, the solid material was dried at 100°C for 12 hours and then calcined at 400°C for 6 hours in a tube furnace to obtain MCM-41 (Mn-MCM-41) loaded with nano-manganese metal clusters.
[0056] (5) Take 3g of 12wt% silica sol and impregnate 1g of Mn-NaY;
[0057] (6) Take 1g of Mn-MCM-41 powder and mix it with 1g of Mn-NaY after soaking. Repeat the process twice to form a Mn-MCM-41 shell on its surface.
[0058] (7) The obtained product was calcined in a tube furnace at 500°C for 2 hours with a heating rate of 8-10°C / min to obtain the ultrafine nano-metal anchored core-shell structure catalyst Mn-NaY@Mn-MCM-41.
[0059] Catalyst performance evaluation: At room temperature, 0.15 g of the above catalyst was placed in the discharge region of the plasma reactor, and a gas to be treated containing 150 ppm toluene was introduced at a gas flow rate of 300 ml / min for adsorption without electricity. Then, simulated air (80% N2, 20% O2) was introduced at a gas flow rate of 300 ml / min, and the discharge power was adjusted to 15 kHz to degrade VOCs. After the experiment, CO... x Yield 91.1%, CO2 selectivity 92.3%.
[0060] The prepared Mn-NaY@Mn-MCM-41 was characterized by H2-TPR, such as... Figure 3 As shown.
[0061] Example 2
[0062] (1) Take 1g of ~500μm NaY into 20ml of 1.2mmol / L Mn(NO3)2 solution and stir at room temperature for 24h;
[0063] (2) Wash with deionized water by centrifugation and air dry at room temperature to obtain NaY (Mn-NaY) anchored to ultrafine nano-manganese metal clusters;
[0064] (3) Take 633 μl of 50% manganese nitrate, 152.1 μl of ethylene glycol, and 17.2 ml of deionized water and mix them to impregnate 3 g of dried ~7 μm MCM-41.
[0065] (4) After standing at room temperature for 12 hours, the solid material was dried at 100°C for 12 hours and then calcined at 400°C for 6 hours in a tube furnace to obtain MCM-41 (Mn-MCM-41) loaded with nano-manganese metal clusters.
[0066] (5) Take 3g of 12wt% silica sol and impregnate 1g of Mn-NaY;
[0067] (6) Take 1g of Mn-MCM-41 powder and mix it with 3g of Mn-NaY after soaking. Repeat this process once to form a Mn-MCM-41 shell on its surface.
[0068] (7) The obtained product was calcined in a tube furnace at 500°C for 2 hours with a heating rate of 5-7°C / min to obtain the ultrafine nano-metal anchored core-shell structure catalyst Mn-NaY@Mn-MCM-41.
[0069] Catalyst performance evaluation: At room temperature, 0.15 g of the above catalyst was placed in the discharge region of the plasma reactor, and a gas to be treated containing 150 ppm toluene was introduced at a gas flow rate of 300 ml / min for adsorption without electricity. Then, simulated air (80% N2, 20% O2) was introduced at a gas flow rate of 300 ml / min, and the discharge power was adjusted to 15 kHz to degrade VOCs. After the experiment, CO... x Yield 92.9%, CO2 selectivity 92.6%.
[0070] The prepared core-shell catalyst was characterized by H2-TPR, such as... Figure 3 As can be seen from the results, by adjusting the catalyst synthesis conditions, the reduction performance and Mn valence state of the catalyst change, which confirms that the catalyst prepared by this invention has high controllability and a wider range of applications.
[0071] Example 3
[0072] (1) Take 1g of ~500μm NaY into 20ml of 1mmol / L Mn(NO3)2 solution and stir at room temperature for 24h;
[0073] (2) Wash with deionized water by centrifugation and air dry at room temperature to obtain NaY (Mn-NaY) anchored to ultrafine nano-manganese metal clusters;
[0074] (3) Take 886.2 μl of 50% manganese nitrate, 212.94 μl of ethylene glycol, and 16.9 ml of deionized water and mix them to impregnate 3 g of dried ~10 μm MCM-41.
[0075] (4) After standing at room temperature for 12 hours, the solid material was dried at 100°C for 12 hours and then calcined in a tube furnace at 400°C to obtain MCM-41 (Mn-MCM-41) loaded with nano-manganese metal clusters.
[0076] (5) Take 3g of 12wt% silica sol and impregnate 1g of Mn-NaY;
[0077] (6) Take 1g of Mn-MCM-41 powder and mix it with 1.5g of Mn-NaY after soaking. Repeat the process twice to form a Mn-MCM-41 shell on its surface.
[0078] (7) The obtained product was calcined in a tube furnace at 500°C for 2 hours to obtain the ultrafine nano-metal anchored core-shell structure catalyst Mn-NaY@Mn-MCM-41.
[0079] Catalyst performance evaluation: At room temperature, 0.15 g of the above catalyst was placed in the discharge region of the plasma reactor, and a gas to be treated containing 150 ppm toluene was introduced at a gas flow rate of 300 ml / min for adsorption without electricity. Then, simulated air (80% N2, 20% O2) was introduced at a gas flow rate of 300 ml / min, and the discharge power was adjusted to 15 kHz to degrade VOCs. After the experiment, CO... x Yield 95.1%, CO2 selectivity 94.7%.
[0080] Example 4
[0081] (1) Take 1g of ~400μm NaY into 20ml of 1.5mmol / L Mn(NO3)2 solution and stir at room temperature for 24h;
[0082] (2) Wash with deionized water by centrifugation and air dry at room temperature to obtain NaY (Mn-NaY) anchored to ultrafine nano-manganese metal clusters;
[0083] (3) Take 590.8 μl of 50% manganese nitrate, 141.96 μl of ethylene glycol, and 11.2 ml of deionized water and mix them to impregnate 2 g of dried ~10 μm MCM-41.
[0084] (4) After standing at room temperature for 12 hours, the solid material was dried at 100°C for 12 hours and then calcined in a tube furnace at 400°C to obtain MCM-41 (Mn-MCM-41) loaded with nano-manganese metal clusters.
[0085] (5) Take 3g of 12wt% silica sol and impregnate 1g of Mn-NaY;
[0086] (6) Take 1g of Mn-MCM-41 powder and mix it with 1g of Mn-NaY after soaking. Repeat the process twice to form a Mn-MCM-41 shell on its surface.
[0087] (7) The obtained product was calcined in a tube furnace at 500°C for 2 hours to obtain the ultrafine nano-metal anchored core-shell structure catalyst Mn-NaY@Mn-MCM-41.
[0088] Catalyst performance evaluation: At room temperature, 0.15 g of the above catalyst was placed in the discharge region of the plasma reactor, and a gas to be treated containing 150 ppm toluene was introduced at a gas flow rate of 300 ml / min for adsorption without electricity. Then, simulated air (80% N2, 20% O2) was introduced at a gas flow rate of 300 ml / min, and the discharge power was adjusted to 15 kHz to degrade VOCs. After the experiment, CO... x Yield 93.5%, CO2 selectivity 92.1%.
[0089] Example 5
[0090] (1) Take 1g of ~200μm NaY into 20ml of 1mmol / L Mn(NO3)2 solution and stir at room temperature for 36h;
[0091] (2) Wash with deionized water by centrifugation and air dry at room temperature to obtain NaY (Mn-NaY) anchored to ultrafine nano-manganese metal clusters;
[0092] (3) Take 886.2 μl of 50% manganese nitrate, 212.94 μl of ethylene glycol, and 16.9 ml of deionized water and mix them to impregnate 3 g of dried ~10 μm MCM-41.
[0093] (4) After standing at room temperature for 10 hours, the solid material was dried at 80°C for 12 hours and then calcined at 350°C for 5 hours in a tube furnace to obtain MCM-41 (Mn-MCM-41) loaded with nano-manganese metal clusters.
[0094] (5) Take 3g of 12wt% silica sol and impregnate 1g of Mn-NaY;
[0095] (6) Take 1g of Mn-MCM-41 powder and mix it with 1.5g of soaked Mn-NaY to form a Mn-MCM-41 shell on its surface;
[0096] (7) The obtained product was calcined in a tube furnace at 550°C for 3 hours with a heating rate of 2-5°C / min to obtain the ultrafine nano-metal anchored core-shell structure catalyst Mn-NaY@Mn-MCM-41.
[0097] Catalyst performance evaluation: At room temperature, 0.15 g of the above catalyst was placed in the discharge region of the plasma reactor, and a gas to be treated containing 150 ppm toluene was introduced at a gas flow rate of 300 ml / min for adsorption without electricity. Then, simulated air (80% N2, 20% O2) was introduced at a gas flow rate of 300 ml / min, and the discharge power was adjusted to 15 kHz to degrade VOCs. After the experiment, CO... x Yield 91.8%, CO2 selectivity 93.5%.
[0098] Example 6
[0099] (1) Take 1g of ~400μm NaY into 20ml of 1.5mmol / L Mn(NO3)2 solution and stir at room temperature for 16h;
[0100] (2) Wash with deionized water by centrifugation and air dry at room temperature to obtain NaY (Mn-NaY) anchored to ultrafine nano-manganese metal clusters;
[0101] (3) Take 590.8 μl of 50% manganese nitrate, 141.96 μl of ethylene glycol, and 11.2 ml of deionized water and mix them to impregnate 2 g of dried ~5 μm MCM-41.
[0102] (4) After standing at room temperature for 16 hours, the solid material was dried at 100°C for 10 hours and then calcined at 450°C for 7 hours in a tube furnace to obtain MCM-41 (Mn-MCM-41) loaded with nano-manganese metal clusters.
[0103] (5) Take 3g of 12wt% silica sol and impregnate 1g of Mn-NaY;
[0104] (6) Take 1g of Mn-MCM-41 powder and mix it with 1g of Mn-NaY after soaking. Repeat the process twice to form a Mn-MCM-41 shell on its surface.
[0105] (7) The obtained product was calcined in a tube furnace at 400°C for 2 hours with a heating rate of 6-9°C / min to obtain the ultrafine nano-metal anchored core-shell structure catalyst Mn-NaY@Mn-MCM-41.
[0106] Catalyst performance evaluation: At room temperature, 0.15 g of the above catalyst was placed in the discharge region of the plasma reactor, and a gas to be treated containing 150 ppm toluene was introduced at a gas flow rate of 300 ml / min for adsorption without electricity. Then, simulated air (80% N2, 20% O2) was introduced at a gas flow rate of 300 ml / min, and the discharge power was adjusted to 15 kHz to degrade VOCs. After the experiment, CO... xYield 92.9%, CO2 selectivity 94.8%.
Claims
1. A core-shell catalyst for plasma adsorption-catalysis, characterized in that, The core layer of the core-shell catalyst is Mn-NaY, and the shell layer of the core-shell catalyst is Mn-MCM-41; the Mn-NaY is NaY anchored with ultrafine nano-manganese metal clusters; the Mn-MCM-41 is MCM-41 loaded with nano-manganese metal clusters.
2. The core-shell catalyst for plasma adsorption-catalysis according to claim 1, characterized in that, The core layer is physically covered by the shell layer.
3. The method for preparing the core-shell catalyst for plasma adsorption-catalysis according to claim 1 or 2, characterized in that, Includes the following steps: (1) Mn-NaY is immersed in silica sol and then uniformly mixed with Mn-MCM-41 powder, so that Mn-MCM-41 forms a shell on the surface of Mn-NaY to obtain a precursor; Mn-NaY is NaY anchored with ultrafine nano-manganese metal clusters; Mn-MCM-41 is MCM-41 loaded with nano-manganese metal clusters; (2) The precursor is calcined at 400~550℃ to obtain the product.
4. The preparation method according to claim 3, characterized in that, The mass ratio of Mn-MCM-41 to Mn-NaY is 1:1~3.
5. The preparation method according to claim 3, characterized in that, The Mn-NaY was prepared by ion exchange.
6. The preparation method according to claim 5, characterized in that, The Mn-NaY is prepared by the following method: (0-1) Disperse NaY molecular sieves in Mn 2+ After stirring in an aqueous solution for 16-36 hours, centrifugation was performed to obtain Mn-NaY.
7. The preparation method according to claim 6, characterized in that, The particle size of the NaY molecular sieve is 200~500μm.
8. The preparation method according to claim 6, characterized in that, In step (0-1), the mass ratio of Mn to NaY molecular sieve is less than 1%.
9. The preparation method according to claim 3, characterized in that, The Mn-MCM-41 is prepared by impregnation.
10. The preparation method according to claim 9, characterized in that, The Mn-MCM-41 is prepared by the following method: (0-2) The dried MCM-41 molecular sieve was impregnated with ethylene glycol and Mn. 2+ The mixture is placed in a mixed aqueous solution for 10-16 hours, and then dried to obtain a solid material; the solid material is then calcined at 350-450°C to obtain the final product.
11. The preparation method according to claim 10, characterized in that, The particle size of the MCM-41 molecular sieve is 5~10μm.
12. The preparation method according to claim 10, characterized in that, In step (0-2), the mass ratio of Mn element to MCM-41 molecular sieve is less than 10 wt%.
13. The application of the core-shell catalyst for plasma adsorption-catalysis as described in claim 1 or 2 in the adsorption-catalytic degradation of VOCs by synergistic plasma, characterized in that, The application includes: placing the core-shell catalyst in the discharge region of a plasma reactor, introducing a gas to be treated containing VOCs, and adsorbing it without electricity; then introducing a reaction gas without VOCs, and adjusting the discharge voltage and power to degrade the VOCs at room temperature and pressure.
14. The application according to claim 13, characterized in that, The plasma reactor is a DBD reactor, which uses a quartz glass tube with an outer diameter of 10 mm and an inner diameter of 8 mm as the medium, the discharge zone is 30 mm long, the inner electrode is a stainless steel tube with a diameter of 3 mm, the inner electrode is located in the middle of the DBD reactor, and the outer electrode is wrapped with a copper mesh.