CN-116406067-B - Plasma generating device based on compact microporous material catalysis

Abstract

The invention relates to a plasma generating device based on catalysis of a compact microporous material, and belongs to the technical field of low-temperature plasmas. The plasma generating device comprises at least one discharge unit, wherein the discharge unit comprises a first electrode, a microporous ceramic medium and a second electrode, the first electrode is used for being connected with a power supply, the second electrode is used for being grounded, and the microporous ceramic medium is used for adsorbing gas molecules and active particles generated by plasma discharge. The invention generates micro discharge in the medium with compact micropores, the medium with compact micropores has extremely high specific surface area, the gas can be adsorbed on the surface of the micropores of the medium when passing through, the active substances in the plasma are also adsorbed by the surface of the micropores of the medium, the contact efficiency of particles with short service life and high activity and free radicals in the plasma and reactants can be improved, the surface catalytic reaction is promoted, and the working efficiency of the whole device is improved.

Inventors

• LU XINPEI
• LI ZHIYU
• LIU YUEXI
• NIE LANLAN

Assignees

• 华中科技大学

Dates

Publication Date

20260505

Application Date

20230329

Claims (9)

1. 1. The plasma generating device based on the catalysis of the microporous material is characterized by comprising at least one discharge unit, wherein the discharge unit comprises a first electrode, a microporous ceramic medium and a second electrode, the first electrode is used for being connected with a power supply, and the second electrode is used for being grounded; Any surface of the microporous ceramic medium is covered with a solid insulating medium plate with a non-microporous structure, or a layer of solid insulating medium plate with a non-microporous structure is inserted into the microporous ceramic medium; and a catalyst is loaded on the microporous ceramic medium.
2. 2. The microporous material catalyzed based plasma generating device of claim 1, wherein the first electrode, the microporous ceramic medium, and the second electrode are in a flat plate structure or a coaxial cylinder structure, wherein the microporous ceramic medium is positioned between the first electrode and the second electrode.
3. 3. The microporous material catalyzed plasma generating device of claim 1 or 2, wherein the plasma generating device comprises a plurality of discharge cells, and the first electrode and the second electrode are alternately arranged from top to bottom or from inside to outside.
4. 4. The microporous material catalyzed based plasma generating device of claim 1, wherein the first electrode and the second electrode are embedded in a microporous ceramic medium.
5. 5. The microporous material catalyzed based plasma generating device of claim 4, wherein the first electrode and the second electrode form a square array or a ring array.
6. 6. The microporous material catalyzed plasma generating device according to claim 1, wherein the pore size of the microporous ceramic medium is from 0.1 μm to 50 μm.
7. 7. The microporous material catalyzed plasma generating device of claim 1 or 6, wherein the microporous ceramic medium is aluminum oxide or silicon carbide.
8. 8. The microporous material catalyzed based plasma generating device of claim 1, wherein the catalyst is a metal oxide or noble metal material.
9. 9. The microporous material catalyzed plasma generating device of claim 1, wherein the catalyst is a photocatalyst.

Description

Plasma generating device based on compact microporous material catalysis Technical Field The invention belongs to the technical field of low-temperature plasmas, and particularly relates to a plasma generating device based on catalysis of a compact microporous material. Background The plasma is a particle set composed of electrons, ions, neutral atoms, excited state particles, metastable state particles and various active free radicals, has extremely high chemical activity, and has good application prospect in the fields of gas catalytic conversion, chemical synthesis and the like. The current plasma generating device, such as a dielectric barrier discharge device, can generate arc discharge between electrodes when high voltage is applied to the electrodes on two sides of a medium, so that the plasma discharge is localized, the ideal uniform discharge effect of the dielectric barrier plasma generating device in the medium can not be achieved, the residence time of reactants in a plasma area is short, and the treatment efficiency is limited. In the sliding arc discharge device structure commonly used in the plasma gas catalysis field, the plasma can periodically move along with the gas flow, only a small part of gas can react with the plasma, and most of gas flows out of the reactor without participating in the reaction. Patent CN106102294a discloses a microporous dielectric barrier plasma reactor, the surface of the discharge electrode plate of which is covered by a nano ceramic plate, each layer of nano ceramic discharge device comprises two discharge units, a plasma region is formed between the two discharge units, a gas channel with a width of 5-7mm for the processed gas to pass through is formed in the plasma release region between the two discharge units, and the processed gas in the gas channel is discharged from a gas outlet after discharge treatment of the nano ceramic electrode device. In the invention, the nano ceramic plate is used as a medium to generate uniform plasmas in the gas gap, the residence time of the working gas in a plasma area is short, the collision probability between active particles generated by discharging in the gas gap is large, the annihilation of the active particles is accelerated, and the average service life of the active particles is low. Patent CN106268302a discloses a packed bed plasma catalytic cleaner, each purifying group is formed by arranging two electrode plates, two insulating ceramic plates, an air inlet, two sealing plates and two insulating ceramic plates in parallel to form a purifying channel, two ends of the purifying channel are respectively connected with one sealing plate, the air inlet is arranged on the sealing plates, one electrode plate is respectively fixed on the outer side of the purifying channel formed by the insulating ceramic plates, a plurality of catalytic balls are arranged in the purifying channel, and TiO 2 photocatalyst is coated on the catalytic balls. In the invention, the catalyst is coated on the surface of the medium ball, so that the contact area of air and the catalyst is improved to a certain extent, but the specific surface area of the medium ball is small, a large gap exists between the small balls, a large amount of gas flows from the position where the gap does not have the catalyst, and the treatment efficiency is low. Patent CN113041386a discloses a plasma sterilizing device based on porous medium discharge, the conductive metal foam flat plate electrodes are arranged in parallel at intervals, porous medium is arranged in the middle of the flat plate electrodes, the flat plate electrodes are tightly attached to the porous medium, and bacteria-carrying gas enters from an air inlet, passes through the flat plate electrodes and the porous medium and then is discharged from an air outlet, so that bacteria treatment is realized. In the invention, one of important indexes for measuring the air sterilization effect is air quantity, so that the sterilization efficiency of an indoor air environment is directly determined, the device needs to have smaller wind resistance, the porous ceramic adopted by the invention has the porosity of 10-50ppi, and meanwhile, a foam metal material is adopted as an electrode, so that bacteria-carrying gas is allowed to pass through a flat electrode and a porous medium. However, because the aperture is large, the contact efficiency between the active component generated by the plasma creeping discharge and the gas flow is limited at a level of usually more than 0.3 mm. In addition, the electrode has a plurality of holes, even if the electrode is tightly attached to the porous medium, surface discharge still occurs at the aperture of the electrode, so that not only can extra energy loss be caused, but also oxidation ablation can be caused on the electrode, the service life of the electrode is shortened, and metal vapor enters the ambient air along with air flow to generate extra harm due to the electr