Catalytic filter material loaded with Mn-CoOx composite metal oxide, preparation method of catalytic filter material and regeneration method after sulfur poisoning

Abstract

The invention discloses a catalytic filter material loaded with a Mn-CoOx composite metal oxide, a preparation method of the catalytic filter material and a regeneration method after sulfur poisoning, and belongs to the technical field of industrial tail gas denitration. According to the catalytic filter material prepared by the invention, through a complete technical route of surface functional modification of polydopamine, hydrothermal in-situ growth of a manganese-cobalt catalyst and activation by dipping in hydrogen peroxide, the dust removal function of the catalytic filter material used as the filter material is reserved, and the originally inert polymer fiber surface is activated, so that the catalyst is uniformly dispersed on the surface of the filter material and is firmly loaded on the surface of the filter material. The catalytic filter material which is poisoned and inactivated by sulfur dioxide is soaked in the hydrogen peroxide solution, so that the catalyst is regenerated, the method has the advantages of greenness, simplicity, convenience, low cost and the like, and the service life of the catalytic filter material is effectively prolonged. In conclusion, the catalytic filter material prepared by the invention is high in denitration rate, strong in combination firmness, good in stability, renewable after inactivation, green and low in cost, and has important application value in the technical field of dust removal and denitration.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial tail gas denitration, and in particular relates to a catalytic filter material loaded with a Mn-CoOx composite metal oxide, a preparation method thereof, and a regeneration method after sulfur poisoning. Background Art

[0002] Dust, nitrogen oxides (NOx), sulfur dioxide (SO2), and other gases produced by coal combustion are among the main causes of air pollution. Selective catalytic reduction (SCR) and bag filter technologies are the mainstream treatment methods. However, in industrial flue gas treatment systems, these are performed in two separate processes, resulting in large space requirements, high investment costs, and complex processes. In recent years, through technological innovation and integrated applications, these processes have gradually developed towards higher efficiency and integration. Catalytic filter media, as a combination of these two technologies, achieves synergistic dust removal and denitrification by integrating the functions of the catalyst and filter media, making it a current research hotspot.

[0003] In order to prepare and develop catalytic filter materials, scientific researchers have carried out a lot of research work. The first is in the development of low-temperature denitrification catalysts. Since commercial vanadium-based catalysts are not suitable for the low-temperature use environment of filter materials due to their high active temperature (generally 300-400°C), it is necessary to develop highly active low-temperature denitrification catalysts. The patent with application number 202310822591.X discloses an integrated functional filter material for sulfur resistance, denitrification and dust removal and its preparation method. The functional filter material is composed of a filter material base cloth, a low-temperature denitrification catalyst and a PTFE filter membrane. By separately preparing a low-temperature denitrification catalyst and then loading it on the pretreated filter material base cloth, the denitrification efficiency of the functional filter material in the temperature range of 150-200°C exceeds 80%.

[0004] Other patents such as CN103191603A, CN112755997A, CN116870586A, CN114699845A, etc. all prepare highly active low-temperature denitration catalysts in steps, and then load them on polymer filter materials through surfactants or polytetrafluoroethylene slurries. Although such methods solve the problem of weak bonding strength between the denitration catalyst and the inert filter material surface to a certain extent, they also have problems such as complex processes, large catalyst loading, uneven distribution, and weak low-temperature effect of the active component.

[0005] Patent application number 201410218348.8 discloses a method for in-situ production of a denitrification catalyst on filter media. The method involves forming an active coating on the filter media surface through the oxidative autopolymerization of dopamine. The MnO2 catalyst is then generated in situ on the filter media surface through the chelation of polydopamine and divalent manganese ions and the strong oxidizing action of potassium permanganate. Manganese-based catalysts are widely used in low-temperature SCR catalysts due to their diverse valence states, high electron mobility, excellent redox performance at low temperatures, low cost, low toxicity, and environmental friendliness. The low-temperature activity of manganese oxide catalysts is closely related to their oxidation state, crystallinity and crystal form, morphology, support type, and preparation method. In-situ loading can improve the dispersion and robustness of the catalyst on the filter media, thereby reducing the catalyst loading. However, because the filter media cannot be calcined at high temperatures, most catalysts prepared using this method suffer from poor activity and stability, a single active ingredient, and difficulty in elemental doping. At the same time, manganese-based catalysts have very poor resistance to sulfur dioxide poisoning in high-sulfur atmospheres. Currently, there are few methods for regenerating catalytic filter media after sulfur poisoning. For example, patent CN117547964A uses high-temperature heat treatment to decompose ammonium bisulfate on the catalyst surface, but it is obvious that polymer filter media will also decompose because they cannot withstand high temperature conditions. Therefore, it is urgent to solve the above problems to meet the higher demands in the field of industrial exhaust denitrification technology. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a catalytic filter material loaded with Mn-CoOx composite metal oxide, a preparation method thereof and a regeneration method after sulfur poisoning.

[0007] One of the purposes of the present invention can be achieved by the following technical solutions:

[0008] A method for preparing a catalytic filter material loaded with a Mn-CoOx composite metal oxide comprises the following steps:

[0009] Step 1: After cleaning the polymer filter material, immerse it in a dopamine solution, add an alkaline compound to adjust the pH, and stir until the surface of the filter material is evenly coated with a dopamine functional layer to obtain a modified polymer filter material;

[0010] Step 2: After removing the modified polymer filter material obtained in step 1 from the solution, rinse it with deionized water and ethanol in sequence and dry it to obtain a dry polymer filter material;

[0011] Step 3, preparing a mixed solution of cobalt salt and potassium permanganate to form a Mn-CoOx composite metal oxide catalyst, then adding the dried polymer filter material obtained in step 2 to the mixed solution, and continuously stirring at room temperature, and then allowing to stand to obtain a mixed solution containing the filter material;

[0012] Step 4: Transfer the mixed solution containing the filter material obtained in step 3 to a hydrothermal reactor and place it in an oven for hydrothermal reaction to make Mn-CoO x The composite metal oxide catalyst is formed in situ on the filter media surface and firmly attached;

[0013] Step 5: After the reactor in step 4 is cooled to room temperature, the filter material is taken out, rinsed with deionized water, and then placed in a hydrogen peroxide solution for activation treatment. Finally, it is washed and dried to obtain a catalytic filter material loaded with Mn-CoOx composite metal oxide.

[0014] Furthermore, the polymer filter material in step 1 comes from commercial polyphenylene sulfide needle-punched dust removal filter material or polytetrafluoroethylene needle-punched dust removal filter material.

[0015] Furthermore, the concentration of the dopamine solution in step 1 is 0.1-10 g / L, and the pH value is adjusted to 8-10; the solvent is a mixture of ionized water and ethanol in any proportion; and the alkaline compound is one or more of sodium hydroxide, potassium hydroxide, ammonia water or tris(hydroxymethyl)aminomethane.

[0016] Furthermore, the stirring temperature in step 1 is 0-100° C., and the stirring reaction time is 0.1-48 h.

[0017] Furthermore, in step 2, the drying temperature is 30-100° C., and the drying time is 0.1-48 h.

[0018] Furthermore, in step 3, the cobalt salt is one or more of cobalt nitrate, cobalt chloride, cobalt sulfate and cobalt acetate.

[0019] Furthermore, in step 3, the mass ratio of the dried polymer filter material to potassium permanganate is 1:0.05-1; and the molar ratio of the cobalt salt to potassium permanganate is 1:0.2-10.

[0020] Furthermore, in step 3, the stirring reaction time is 0.1-48h; and the standing time is 0.1-48h.

[0021] Furthermore, in step 4, the hydrothermal reaction temperature is 100-180° C.; and the hydrothermal reaction time is 0.1-48 h.

[0022] Furthermore, in step 5, the activation concentration of hydrogen peroxide is 0.1%-30%, and the activation time is 0.1-48 hours; the drying temperature is 60-180° C., and the drying time is 0.1-48 hours.

[0023] Using commercial needle-punched filter media as the carrier, the surface of the carrier was first functionalized by in-situ polymerization of dopamine to activate the originally inert polymer fiber surface. Then, a high-temperature hydrothermal reaction was used to evenly load the manganese-cobalt composite metal oxide denitrification catalyst on the filter media fiber surface. Finally, the catalytic filter media was activated and modified by immersing it in a hydrogen peroxide solution to improve its low-temperature denitrification performance.

[0024] The second object of the present invention is to provide a method for regenerating the above-mentioned catalytic filter material after sulfur poisoning, which can be achieved by the following technical solutions:

[0025] A method for regenerating a catalytic filter material loaded with a Mn-CoOx composite metal oxide after sulfur poisoning comprises the following steps:

[0026] Step B1, immersing the denitration catalytic filter material poisoned by sulfur dioxide in a hydrogen peroxide solution (mass fraction 0.1%-30%) for activation treatment to decompose and oxidize sulfate and other substances on its surface to obtain a filter material;

[0027] Step B2: After the filter material of step B1 is taken out from the solution, it is rinsed with deionized water and ethanol, and dried at 60-180° C. for 0.1-48 hours. The denitrification activity of the filter material can be restored to obtain a regenerated catalytic filter material.

[0028] Furthermore, the activation treatment in step B1 is performed by one or more methods selected from stirring, oscillation and ultrasound, and the activation treatment time is 0.1-48 hours.

[0029] By impregnating the filter material with hydrogen peroxide solution, the sulfate and other substances on the surface of the poisoned and inactivated filter material are decomposed and oxidized, thereby improving the ability of the surface catalyst to adsorb NH3 and promoting the regeneration of the catalyst.

[0030] Beneficial effects of the present invention:

[0031] 1. The catalytic filter material prepared by the present invention successfully loads a highly active manganese-cobalt composite metal oxide denitrification catalyst on the surface of the polymer filter material fiber through a complete technical route of surface functionalization modification of polydopamine, hydrothermal in-situ growth of manganese-cobalt catalyst and activation by impregnation with hydrogen peroxide. This technology does not destroy the physicochemical properties and structure of the original filter material, retains its dust removal function as a filter material, and activates the originally inert polymer fiber surface, so that the catalyst is evenly dispersed on the filter material surface and firmly loaded.

[0032] 2. By immersing the inactivated catalytic filter media poisoned by sulfur dioxide in a hydrogen peroxide solution, surface sulfates and other substances are decomposed or oxidized, increasing the catalyst's ability to adsorb NH3, thereby promoting catalyst regeneration. This regeneration method is environmentally friendly, simple, and inexpensive, effectively extending the service life of the catalytic filter media, reducing losses, and avoiding resource waste, thus showing promising industrial prospects.

[0033] In summary, the catalytic filter material prepared by the present invention has good low-temperature denitrification performance, strong binding strength, good stability, and can be regenerated after deactivation. It is green and cheap, and has important application value in the field of dust removal and denitrification technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] Figure 1 This is a diagram of the homemade tubular SCR reactor apparatus used in the catalytic filter material activity test of Examples 1-7 of the present invention. In the figure, 1 is a steam source; 2 is a pressure reducing valve; 3 is a flow meter; 4 is a mixer; 5 is an air preheater; 6 is a heating and catalytic reactor; 7 is a test sample; and 8 is a flue gas analyzer.

[0036] Figure 2 This is a scanning electron microscope image of the catalytic filter material before regeneration in Example 3 of the present invention.

[0037] Figure 3 This is a scanning electron microscope image of the catalytic filter material after regeneration in Example 3 of the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] Example 1

[0040] About 1.3436 g of cleaned PPS filter material was immersed in a 2 g / L dopamine solution, the pH value was adjusted to 8.5 by adding tris(hydroxymethyl)aminomethane, and stirred at room temperature for 18 hours. Then it was taken out, rinsed with deionized water and ethanol, and dried at 60°C for 12 hours; 0.0876 g of cobalt dichloride hexahydrate and 0.2845 g of potassium permanganate were added to 40 mL of water to prepare a mixed metal ion solution (the molar ratio of cobalt salt and potassium permanganate was 1:5), and then the dried filter material was immediately immersed therein, and stirred continuously at room temperature for 30 minutes, and then continued to stand for 10 hours. Finally, the entire solution containing the filter material was transferred to a hydrothermal reactor and placed in an oven for hydrothermal reaction at 120°C for 12 hours. After cooling, the filter material was taken out, washed with water, and placed in a 6% hydrogen peroxide solution for activation treatment for 1 hour. Finally, it was dried at 60°C for 12 hours to obtain a catalytic filter material loaded with Mn-CoOx composite metal oxide.

[0041] Example 2

[0042] Approximately 1.2374 g of cleaned PPS filter media was immersed in a 4 g / L dopamine solution, the pH was adjusted to 8.5 by adding ammonia, and the solution was stirred at room temperature for 12 hours. The filter media was then removed, rinsed with deionized water and ethanol, and dried at 60°C for 18 hours. A mixed metal ion solution (cobalt dichloride hexahydrate and potassium permanganate in a molar ratio of 1:4) was added to 40 mL of water. The dried filter media was immediately immersed in the solution and stirred at room temperature for 1 hour, followed by a further 2 hours of stagnation. Finally, the entire solution containing the filter media was transferred to a hydrothermal reactor and subjected to a hydrothermal reaction at 160°C in an oven for 8 hours. After cooling, the filter media was removed, rinsed with water, and activated in a 10% hydrogen peroxide solution for 2 hours. Finally, it was dried at 60°C for 12 hours to obtain a catalytic filter media loaded with Mn-CoOx composite metal oxide.

[0043] Example 3

[0044] About 1.3940 g of cleaned PPS filter material was immersed in a 2 g / L dopamine solution, the pH value was adjusted to 8.5 by adding tris(hydroxymethyl)aminomethane, and stirred at room temperature for 18 hours. Then it was taken out, rinsed with deionized water and ethanol, and dried at 60°C for 12 hours; 0.1285 g of cobalt dichloride hexahydrate and 0.2561 g of potassium permanganate were added to 40 mL of water to prepare a mixed metal ion solution (the molar ratio of cobalt salt and potassium permanganate was 1:3), and then the dried filter material was immediately immersed therein, and stirred continuously at room temperature for 30 minutes, and then continued to stand for 12 hours. Finally, the entire solution containing the filter material was transferred to a hydrothermal reactor and placed in an oven for hydrothermal reaction at 120°C for 12 hours. After cooling, the filter material was taken out, washed with water, and placed in a 6% hydrogen peroxide solution for activation treatment for 1 hour. Finally, it was dried at 60°C for 12 hours to obtain a catalytic filter material loaded with Mn-CoOx composite metal oxide.

[0045] Example 4

[0046] Approximately 1.2937 g of cleaned PPS filter media was immersed in a 1 g / L dopamine solution, the pH adjusted to 9 by adding sodium hydroxide, and stirred at room temperature for 6 hours. The filter media was then removed, rinsed with deionized water and ethanol, and dried at 60°C for 12 hours. A mixed metal ion solution (cobalt dichloride hexahydrate and potassium permanganate in a 1:2 molar ratio) was added to 40 mL of water. The dried filter media was immediately immersed in the solution and stirred at room temperature for 10 minutes. The solution was then allowed to stand for 14 hours. Finally, the entire solution containing the filter media was transferred to a hydrothermal reactor and subjected to a hydrothermal reaction at 160°C in an oven for 12 hours. After cooling, the filter media was removed, rinsed with water, and activated in a 15% hydrogen peroxide solution for 30 minutes. Finally, it was dried at 60°C for 12 hours to obtain a catalytic filter media loaded with Mn-CoOx composite metal oxide.

[0047] Example 5

[0048] Approximately 1.2937 g of cleaned PPS filter media was immersed in a 2 g / L dopamine solution, the pH was adjusted to 9 by adding ammonia, and the mixture was stirred at room temperature for 6 hours. The filter media was then removed, rinsed with deionized water and ethanol, and dried at 60°C for 12 hours. A mixed metal ion solution (cobalt dichloride hexahydrate and potassium permanganate in a 1:1 molar ratio) was added to 40 mL of water. The dried filter media was immediately immersed in the solution and stirred at room temperature for 30 minutes. The solution was then allowed to stand for another 12 hours. Finally, the entire solution containing the filter media was transferred to a hydrothermal reactor and subjected to a hydrothermal reaction at 150°C in an oven for 12 hours. After cooling, the filter media was removed, rinsed with water, and activated in a 3% hydrogen peroxide solution for 30 minutes. Finally, it was dried at 60°C for 12 hours to obtain a catalytic filter media loaded with Mn-CoOx composite metal oxide.

[0049] Example 6

[0050] About 1.2916 g of cleaned PPS filter material was immersed in a 3 g / L dopamine solution, the pH value was adjusted to 8 by adding tris(hydroxymethyl)aminomethane, and stirred at room temperature for 18 hours. Then it was taken out, rinsed with deionized water and ethanol, and dried at 60°C for 12 hours; 0.1139 g of cobalt dichloride hexahydrate and 0.3470 g of potassium permanganate were added to 40 mL of water to prepare a mixed metal ion solution (the molar ratio of cobalt salt and potassium permanganate was 2:1), and then the dried filter material was immediately immersed therein, and stirred continuously at room temperature for 30 minutes, and then continued to stand for 12 hours. Finally, the entire solution containing the filter material was transferred to a hydrothermal reactor and placed in an oven for hydrothermal reaction at 160°C for 12 hours. After cooling, the filter material was taken out, washed with water, and placed in a 1% hydrogen peroxide solution for activation treatment for 4 hours. Finally, it was dried at 60°C for 12 hours to obtain a catalytic filter material loaded with Mn-CoOx composite metal oxide.

[0051] Example 7

[0052] The catalytic filter material obtained in Example 3 was subjected to anti-sulfurization for 1 hour at 180° C. and 150 ppm SO 2 gas atmosphere to obtain a catalytic filter material; a scanning electron microscope was used to measure the scanning electron microscope image of the filter material before regeneration. Figure 2 shown.

[0053] Example 8

[0054] The catalytic filter material obtained in Example 7 was regenerated in a 6% hydrogen peroxide solution for 1 hour to decompose and oxidize the sulfate and other substances on its surface to obtain a catalytic filter material. The scanning electron microscope was used to measure the regenerated filter material. Figure 3 shown.

[0055] Example 9

[0056] The catalytic filter material obtained in Example 5 was subjected to anti-sulfurization at 180° C. and 150 ppm SO 2 gas atmosphere for 1 hour to obtain a catalytic filter material.

[0057] Example 10

[0058] The catalytic filter material obtained in Example 9 was regenerated in a 3% hydrogen peroxide solution for 1 hour to decompose and oxidize sulfate and other substances on its surface to obtain a catalytic filter material.

[0059] The activity evaluation of the catalytic filter materials of Examples 1-10 was performed on a self-made tubular SCR reactor. The self-made tubular SCR reactor includes a gas source 1, a pressure reducing valve 2, and a flow meter 3 connected in sequence. The flow meter 3 is connected to a heating and catalytic reactor 6 through a mixer 4 and an air preheater 5. The heating and catalytic reactor 6 is directly connected to a flue gas analyzer 8, and a test sample 7 is placed in the heating and catalytic reactor 6. The structural diagram is shown in FIG. Figure 1 As shown, the specific operations are:

[0060] The catalytic filter material is placed in the middle position of the catalytic reactor, the experimental tubular resistance furnace is used to control the test temperature of the sample, and the flow meter controls the flow rate of each gas, wherein the gas composition simulates the composition in the flue gas, that is, NO is 500ppm, NH3 is 500ppm, O2 accounts for 5%, and the rest is N2, and the total gas flow rate is 300mL / min. Before entering the tubular resistance furnace, the gas is first mixed evenly by a gas mixer, and then preheated to a certain temperature by a preheater. The experimental test temperature range is 100-180℃. The German M60x flue gas analyzer is used to measure the composition and content of the inlet and outlet gases in the tubular resistance furnace at 160℃ and 180℃ for Examples 1-6, and the denitrification rate is calculated, and the denitrification rate of Examples 7-10 at 180℃ is measured. Each test point must be tested after the temperature is stable for at least 10 minutes. The denitrification rate is determined by the inlet and outlet nitrogen oxides (NO x ) is calculated, as shown in the following formula:

[0061]

[0062] The measured results are shown in Table 1:

[0063] Table 1

[0064]

[0065] As can be seen from Table 1, the catalytic filter materials prepared in the embodiments of the present invention, especially Example 3, have good denitration performance, and as can be seen from Examples 7-10, the denitration performance of the catalytic filter materials decreases significantly after sulfur poisoning, but after regeneration, a high denitration rate can still be guaranteed. In summary, the catalytic filter materials prepared in the present invention have important application value in the field of industrial exhaust denitration technology.

[0066] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0067] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A method for preparing a catalytic filter material loaded with Mn-CoOx composite metal oxide, characterized in that: The following steps are involved: Step 1: After cleaning the polymer filter material, immerse it in a dopamine solution, add an alkaline compound to adjust the pH, and stir to obtain a modified polymer filter material; Step 2: taking out the modified polymer filter material obtained in step 1 from the solution, rinsing it and drying it to obtain a dry polymer filter material; Step 3, preparing a mixed solution of cobalt salt and potassium permanganate, then adding the dried polymer filter material obtained in step 2 to the mixed solution, and continuously stirring at room temperature, and then allowing to stand to obtain a mixed solution containing the filter material; Step 4: transferring the mixed solution containing the filter material obtained in step 3 to a hydrothermal reaction kettle and placing it in an oven for hydrothermal reaction; Step 5: After the reactor in step 4 is cooled to room temperature, the filter material is taken out, rinsed clean, and then placed in a hydrogen peroxide solution for activation treatment. Finally, it is washed and dried to obtain a catalytic filter material loaded with Mn-CoOx composite metal oxide.

2. The method for preparing a catalytic filter material loaded with Mn-CoOx composite metal oxide according to claim 1, characterized in that: The polymer filter material in step 1 is a polyphenylene sulfide needle-punched dust removal filter material or a polytetrafluoroethylene needle-punched dust removal filter material.

3. The method for preparing a catalytic filter material loaded with Mn-CoOx composite metal oxide according to claim 1, characterized in that: In step 1, the concentration of the dopamine solution is 0.1-10 g / L, and the pH value is adjusted to 8-10; the alkaline compound is one or more of sodium hydroxide, potassium hydroxide, ammonia water or tris(hydroxymethyl)aminomethane.

4. The method for preparing a catalytic filter material loaded with Mn-CoOx composite metal oxide according to claim 1, characterized in that: The stirring temperature in step 1 is 0-100° C., and the stirring reaction time is 0.1-48 h.

5. The method for preparing a catalytic filter material loaded with Mn-CoOx composite metal oxide according to claim 1, characterized in that: The drying temperature in step 2 is 30-100° C., and the drying time is 0.1-48 hours.

6. The method for preparing a catalytic filter material loaded with Mn-CoOx composite metal oxide according to claim 1, characterized in that: In step 3, the cobalt salt is one or more of cobalt nitrate, cobalt chloride, cobalt sulfate and cobalt acetate; the mass ratio of the dry polymer filter material to potassium permanganate is 1:0.05-1; the molar ratio of the cobalt salt to potassium permanganate is 1:0.2-10; the stirring reaction time is 0.1-48 hours; and the standing time is 0.1-48 hours.

7. The method for preparing a catalytic filter material loaded with Mn-CoOx composite metal oxide according to claim 1, characterized in that: In step 4, the hydrothermal reaction temperature is 100-180° C.; the hydrothermal reaction time is 0.1-48 h.

8. The method for preparing a catalytic filter material loaded with Mn-CoOx composite metal oxide according to claim 1, characterized in that: In step 5, the activation concentration of hydrogen peroxide is 0.1%-30%, and the activation time is 0.1-48 hours; the drying temperature is 60-180° C., and the drying time is 0.1-48 hours.

9. A catalytic filter material loaded with Mn-CoOx composite metal oxide, characterized in that: Prepared according to the method according to any one of claims 1 to 8.

10. The method for regenerating a catalytic filter material loaded with a Mn-CoOx composite metal oxide after sulfur poisoning according to claim 9, characterized in that: The following steps are involved: Step B1, immersing the denitration catalytic filter material poisoned by sulfur dioxide in a hydrogen peroxide solution for activation treatment, so that sulfate and other substances on its surface are decomposed and oxidized to obtain a filter material; Step B2: After taking out the filter material from step B1 from the solution, rinse it, and dry it at 60-180° C. for 0.1-48 hours to obtain a regenerated catalytic filter material.

Images