Preparation method and application of PTFE-based manganese-cobalt bimetallic catalytic filter material

Abstract

The invention discloses a preparation method and application of a PTFE-based manganese-cobalt bimetallic catalytic filter material, and belongs to the technical field of catalytic filter materials. According to the method, a polytetrafluoroethylene needle-punched filter material is taken as a base material, a uniform manganese-cobalt composite metal oxide denitration catalyst layer is loaded on the fiber surface through surface polydopamine functional modification treatment in combination with a microwave-assisted deposition technology, and the activity of the catalyst is enhanced by adopting a sodium borohydride activation process. The obtained composite material has high low-temperature denitration activity while maintaining the original filtering performance and mechanical strength of the base material, and the catalyst layer is firmly combined with the fiber matrix. Through the catalysis-filtration integrated design, the technological process of a traditional flue gas purification system is effectively simplified, the problems of equipment complexity, high operation cost and the like caused by separation of a dust removal unit and a denitration unit in the prior art are solved, and an efficient and energy-saving novel material solution is provided for industrial flue gas treatment.

Description

Technical Field

[0001] The present invention belongs to the technical field of catalytic filter materials, and in particular relates to a preparation method and application of a PTFE-based manganese-cobalt bimetallic catalytic filter material. Background Art

[0002] The smoke and nitrogen oxides (NO x ), sulfur oxides (SO x ) and other pollutants are the main causes of smog and acid rain. High-temperature flue gas emission sources represented by coal-fired power plants and new dry cement kilns, as well as medium and low-temperature stationary sources such as garbage incinerators and metal smelting kilns, are all sources of dust and NO x The existing treatment system mostly adopts the series process of selective catalytic reduction (SCR) and non-woven fabric-based bag dust removal, in which SCR technology converts NO x Converted into harmless N2. Among many technologies, NH3 has become the mainstream treatment solution due to its high conversion rate, excellent selectivity and significant practicality as a reducing agent. The needle-punched felt filter material has a three-dimensional network structure, and the bag dust collector it forms can keep the dust content of the flue gas after dust removal stable below 30mg / m 3 However, the split type purification system has inherent defects such as large floor space, lengthy process flow and high equipment investment cost. By developing a composite filter material with surface catalytic function, NO can be simultaneously achieved in the dust filtration process. x Catalytic conversion can build an integrated flue gas purification system, which simplifies equipment space requirements compared to traditional processes and reduces operating costs. It has important engineering application value in promoting the in-depth treatment of industrial flue gas.

[0003] Patent application number CN202411941141.3 discloses a method for preparing and using a PTFE catalytic filter material. The preparation of the PTFE catalytic filter material includes the preparation of a MnCeTi catalyst, the preparation of PTFE catalytic fibers, heteropolyacid functionalization, and acupuncture. Although heteropolyacid functionalization further optimizes surface oxygen vacancies, acidic sites, and other properties, the low-temperature catalytic performance of the PTFE catalytic filter material is improved. Other patents such as CN103191603A, CN112755997A, CN116870586A, and CN114699845A also prepare highly active low-temperature denitrification catalysts in steps and then load them onto polymer filter materials. Although such methods can guarantee catalytic activity to a certain extent, they also have problems such as complex processes, large catalyst loadings, and uneven distribution. The patent application number CN202410698133.4 discloses a preparation method and application of a PPS-supported ternary Mn-based catalyst, which is prepared by reacting the cleaned PPS filter material with trimethylchlorosilane to obtain a chloromethylated PPS filter material, which is then reacted with aqueous ammonia to introduce amino groups into the PPS filter material. The ternary Mn-based catalyst is immobilized on the PPS filter material by an in-situ synthesis method. This in-situ loading method effectively solves the problem of easy detachment of the catalyst in traditional methods, but it also causes certain damage to the filter material, thereby affecting its original filtration performance. In addition, due to the lack of a high-temperature activation step, the low-temperature activity of the catalytic filter material in conventional low-temperature synthesis methods has not been able to break through the bottleneck. Summary of the Invention

[0004] The purpose of the present invention is to provide a preparation method and application of an integrated catalytic filter material for denitrification and dust removal that has high low-temperature denitrification activity, exceeds the theoretical activity of the catalyst, and combines the catalyst with the filter material, so as to solve the problems mentioned in the above technical background, such as the complex preparation method of the catalytic filter material, the difficulty in breaking through the low-temperature activity and the theoretical activity threshold of the catalyst.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A method for preparing a PTFE-based manganese-cobalt bimetallic catalytic filter material comprises the following steps: using a PTFE needle-punched filter material as a carrier, uniformly loading a manganese-cobalt composite metal oxide denitrification catalyst on the filter material fiber surface through surface functionalization modification of polydopamine and microwave-assisted deposition reaction, and simultaneously activating the catalyst layer with a trace amount of sodium borohydride to obtain the catalytic filter material.

[0007] This method not only surpasses the theoretical threshold of manganese-cobalt catalysts, but also fully preserves the dust removal function of the filter bag while maintaining the physical and chemical properties and structural integrity of the original filter media. It also successfully modifies the surface of the inert polymer fiber with dopamine. After microwave-assisted deposition of a manganese-cobalt composite metal oxide denitrification catalyst and subsequent modification with trace amounts of sodium borohydride, the filter media exhibits excellent denitrification activity under low-temperature conditions. Furthermore, the strong bonding effect of polydopamine creates a stable interface between the catalyst and the filter media matrix.

[0008] Specifically, the above preparation method comprises the following steps:

[0009] (1) Soak the cleaned PTFE filter material in ethanol for a period of time, then take it out and let it stand;

[0010] (2) immersing the filter material in step (1) in an alkaline solution of dopamine and stirring at a certain temperature for a period of time so that the surface of the filter material fiber is evenly coated with a polymer functional layer;

[0011] (3) After removing the polymer-modified PTFE filter material from the solution, rinse it with deionized water and ethanol and dry it;

[0012] (4) immersing the dried filter material in step (3) in deionized water, adding cobalt salt and potassium permanganate in sequence, stirring continuously at room temperature for a period of time, and then continuing to stand for a period of time;

[0013] (5) transferring the entire solution containing the filter material in step (4) into a microwave oven and reacting it at a certain power for a period of time;

[0014] (6) After the solution in step (5) is cooled to room temperature, the Mn-CoO x The modified PTFE filter material of the composite metal oxide catalyst is rinsed with deionized water and ethanol and then activated and dried at a certain temperature;

[0015] (7) immersing the dried filter material in step (6) in an alkaline sodium borohydride solution of a certain concentration and stirring the solution at a certain temperature for a period of time to fully activate the catalytic layer;

[0016] (8) After the activated PTFE filter material is taken out from the solution, it is rinsed with deionized water and ethanol and then vacuum-dried at a certain temperature to obtain the catalytic filter material.

[0017] Preferably, the soaking time in step (1) is 0-12 hours, and the standing time is 0-2 hours.

[0018] Preferably, the concentration of dopamine in step (2) is 0.1-10 g / L, the solvent in the alkaline solution is a mixture of deionized water and ethanol in any proportion, and one or more compounds selected from sodium hydroxide, potassium hydroxide, ammonia water or tris(hydroxymethyl)aminomethane are added thereto to adjust the pH value to between 8 and 10; the stirring temperature is between 0-100° C., and the stirring reaction time is 0.5-48 h.

[0019] Preferably, the drying temperature in step (3) is between 50-150° C., and the drying time is 0.5-48 h.

[0020] Preferably, the cobalt salt in step (4) is selected from one or more of cobalt chloride, cobalt nitrate, cobalt sulfate, cobalt phosphate and cobalt sulfite; the mass ratio of the filter material to potassium permanganate is controlled to be between 2:1-20:1, and the molar ratio of the cobalt salt to potassium permanganate is between 0:1-5:1; the stirring reaction time is 0.5-48h; and the standing time is 0.5-48h.

[0021] Preferably, the microwave-assisted deposition reaction power in step (5) is 900 W; and the microwave reaction time is 0-20 min.

[0022] Preferably, the activation and drying temperature in step (6) is between 50-150° C., and the drying time is between 0.5-48 h.

[0023] Preferably, the concentration of sodium borohydride in step (7) is 0-0.5 g / L, the solvent in the alkaline solution is a mixture of deionized water and ethanol in any proportion, and one or more compounds selected from sodium hydroxide, potassium hydroxide, ammonia water or tris(hydroxymethyl)aminomethane are added thereto to adjust the pH value to between 9 and 12; the stirring temperature is between 0-100° C., and the stirring reaction time is 0-8 h.

[0024] Preferably, the vacuum drying temperature in step (8) is between 50-150° C., and the drying time is 0.5-48 h.

[0025] Another object of the present invention is to provide the use of the catalytic filter material prepared by the above method in dust removal and denitrification, especially in industrial flue gas dust removal and denitrification.

[0026] Beneficial effects of the present invention:

[0027] 1. Through surface functionalization and microwave-assisted deposition of polydopamine, a manganese-cobalt composite metal oxide denitrification catalyst was successfully loaded onto the filter media fiber surface. Simultaneously, a trace amount of sodium borohydride was used to activate the catalyst. This significantly enhanced the filter media's catalytic performance while preserving its physical and chemical properties and structure, preserving its dust removal function for bag filters. Furthermore, dopamine modified the otherwise inert polymer fiber surface, ensuring uniform dispersion and strong bonding of the catalyst to the filter media surface.

[0028] 2. By precisely regulating the oxygen vacancies on the catalyst surface with trace amounts of sodium borohydride, the surface active sites of the catalyst are effectively activated. The activated manganese-cobalt-based binary metal oxide denitrification catalyst has better low-temperature denitrification activity, proposing a new solution to the limited theoretical activity threshold of low-temperature denitrification catalysts.

[0029] 3. The preparation method of the catalytic filter material provided by the present invention has the advantages of being green, simple, and inexpensive, and therefore has broad application prospects in industrial flue gas treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] Figure 1 Diagram of the homemade tubular SCR reactor device used in the catalytic filter material activity test.

[0032] Figure 2 The microwave-assisted deposition of Mn-CoO in Example 4 of the present invention x SEM image of PTFE filter material after adjustment of composite metal oxide and trace amount of sodium borohydride.

[0033] In the figure: 1. Gas source; 2. Pressure reducing valve; 3. Flow meter; 4. Mixer; 5. Air preheater; 6. Heating and catalytic reactor; 7. Test sample; 8. Flue gas analyzer. DETAILED DESCRIPTION

[0034] 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.

[0035] like Figure 1As shown, a diagram of a homemade tubular SCR reactor device is used to test the activity of the catalytic filter material in the following examples, including 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.

[0036] Example 1

[0037] The cleaned PTFE filter material of about 1.2g was immersed in an ethanol solution, taken out after 10 minutes, and allowed to stand for 5 minutes. Then, a 2g / L dopamine solution was added and the pH value was adjusted to about 9 by adding sodium hydroxide. The solution was stirred at room temperature for 24 hours. Then, the solution was taken out, rinsed with deionized water and ethanol, and dried at 80℃ for 12 hours. The dried filter material was immersed in deionized water again, and 0.29g cobalt chloride and 0.12g potassium permanganate were added in sequence. The solution was stirred at room temperature for 0.5 hours, and then the solution was transferred to a microwave oven and heated at a certain power. The reaction was carried out at a low temperature for 6 minutes. After the solution was cooled, the filter material was taken out, rinsed with deionized water and ethanol, and dried at 80°C for 12 hours. The dried filter material was immersed in 0.25 g / L sodium borohydride solution, and the pH value was adjusted to about 10 with sodium hydroxide, and stirred at room temperature for 2 hours. Finally, the filter material was taken out and rinsed with deionized water and ethanol, and then placed in an oven at 80°C for vacuum drying for 12 hours to obtain a PTFE-based manganese-cobalt bimetallic catalytic filter material regulated by microwave-assisted deposition and activation with a trace amount of sodium borohydride.

[0038] Example 2

[0039] The cleaned PTFE filter material of about 1.2g was immersed in an ethanol solution, taken out after 30min, and allowed to stand for 60min. Then, a 2g / L dopamine solution was added and the pH value was adjusted to about 9 by adding tris(hydroxymethyl)aminomethane. The solution was stirred at room temperature for 24h. Then, the solution was taken out, rinsed with deionized water and ethanol, and dried at 80℃ for 12h. The dried filter material was immersed in deionized water again, and 0.29g cobalt chloride and 0.19g potassium permanganate were added in sequence. The solution was stirred at room temperature for 0.5h, and then transferred to a microwave oven. The reaction was carried out at a certain power for 1 minute. After the solution was cooled, the filter material was taken out, rinsed with deionized water and ethanol, and dried at 80°C for 12 hours. The dried filter material was immersed in 0.125 g / L sodium borohydride solution, and the pH value was adjusted to about 10 with sodium hydroxide, and stirred at room temperature for 2 hours. Finally, the filter material was taken out and rinsed with deionized water and ethanol, and then placed in an oven at 80°C for vacuum drying for 12 hours to obtain a PTFE-based manganese-cobalt bimetallic catalytic filter material regulated by microwave-assisted deposition and trace sodium borohydride activation.

[0040] Example 3

[0041] Immerse about 1.2g of cleaned PTFE filter material in ethanol solution, take it out after 1 minute, let it stand for 10 minutes, add 4g / L dopamine solution and adjust the pH value to about 9 by adding sodium hydroxide, and stir it at room temperature for 18 hours. Then take it out, rinse it with deionized water and ethanol, and dry it at 60℃ for 12 hours. Immerse the dried filter material in deionized water again, add 0.24g of cobalt chloride and 0.14g of potassium permanganate in sequence, and continue stirring at room temperature for 0.5h. Then transfer it to a microwave oven and heat it at a certain power. The reaction was carried out at a low temperature for 3 minutes. After the solution was cooled, the filter material was taken out, rinsed with deionized water and ethanol, and dried at 80°C for 12 hours. The dried filter material was immersed in 0.25 g / L sodium borohydride solution, and the pH value was adjusted to about 10 with sodium hydroxide, and stirred at room temperature for 2 hours. Finally, the filter material was taken out and rinsed with deionized water and ethanol, and then placed in an oven at 80°C for vacuum drying for 12 hours to obtain a PTFE-based manganese-cobalt bimetallic catalytic filter material regulated by microwave-assisted deposition and activation with a trace amount of sodium borohydride.

[0042] Example 4

[0043] The cleaned PTFE filter material of about 1.2g was immersed in an ethanol solution, taken out after 10 minutes, and allowed to stand for 5 minutes. Then, a 2g / L dopamine solution was added and the pH value was adjusted to about 9 by adding tris(hydroxymethyl)aminomethane. The solution was stirred at room temperature for 24 hours. Then, the solution was taken out, rinsed with deionized water and ethanol, and dried at 80°C for 12 hours. The dried filter material was immersed in deionized water again, and 0.29g cobalt chloride and 0.19g potassium permanganate were added in sequence. The solution was stirred at room temperature for 0.5 hours, and then transferred to a microwave oven. The reaction was carried out at a certain power for 3 minutes. After the solution was cooled, the filter material was taken out, rinsed with deionized water and ethanol, and dried at 80°C for 12 hours. The dried filter material was immersed in 0.25g / L sodium borohydride solution, and the pH value was adjusted to about 10 with sodium hydroxide, and stirred at room temperature for 2 hours. Finally, the filter material was taken out and rinsed with deionized water and ethanol, and then placed in an oven at 80°C for vacuum drying for 12 hours to obtain a PTFE-based manganese-cobalt bimetallic catalytic filter material regulated by microwave-assisted deposition and activation with a trace amount of sodium borohydride. Figure 2 Shown is a SEM image of the catalytic filter material prepared in this example.

[0044] Example 5

[0045] The cleaned PTFE filter material of about 1.2g was immersed in an ethanol solution, taken out after 1min, and allowed to stand for 10min. Then, a 1g / L dopamine solution was added and the pH value was adjusted to about 9 by adding tris(hydroxymethyl)aminomethane. The solution was stirred at room temperature for 24h. Then, the solution was taken out, rinsed with deionized water and ethanol, and dried at 80℃ for 12h. The dried filter material was immersed in deionized water again, and 0.12g cobalt chloride and 0.19g potassium permanganate were added in sequence. The solution was stirred at room temperature for 0.5h, and then transferred to a microwave oven. The reaction was carried out at a certain power for 3 minutes. After the solution was cooled, the filter material was taken out, rinsed with deionized water and ethanol, and dried at 80°C for 12 hours. The dried filter material was immersed in 0.125 g / L sodium borohydride solution, and the pH value was adjusted to about 10 with sodium hydroxide, and stirred at room temperature for 2 hours. Finally, the filter material was taken out and rinsed with deionized water and ethanol, and then placed in an oven at 80°C for vacuum drying for 12 hours to obtain a PTFE-based manganese-cobalt bimetallic catalytic filter material regulated by microwave-assisted deposition and trace sodium borohydride activation.

[0046] Example 6

[0047] Immerse about 1.2g of cleaned PTFE filter material in an ethanol solution, take it out after 10 minutes, let it stand for 5 minutes, add 2g / L dopamine solution, adjust the pH value to about 9 by adding tris(hydroxymethyl)aminomethane, and stir it at room temperature for 24 hours. Then take it out, rinse it with deionized water and ethanol, and dry it at 80℃ for 12 hours. Immerse the dried filter material in deionized water again, add 0.29g of cobalt chloride and 0.19g of potassium permanganate in sequence, and continue stirring at room temperature for 0.5 hours. Then transfer it to a microwave oven. The reaction was carried out at a certain power for 3 minutes. After the solution was cooled, the filter material was taken out, rinsed with deionized water and ethanol, and dried at 80°C for 12 hours. The dried filter material was immersed in a 0.5 g / L sodium borohydride solution, and the pH value was adjusted to about 10 with sodium hydroxide, and stirred at room temperature for 2 hours. Finally, the filter material was taken out, rinsed with deionized water and ethanol, and placed in an oven at 80°C for vacuum drying for 12 hours to obtain a PTFE-based manganese-cobalt bimetallic catalytic filter material regulated by microwave-assisted deposition and trace sodium borohydride activation.

[0048] Comparative Example 1

[0049] The cleaned PTFE filter material of about 1.2 g was immersed in an ethanol solution, taken out after 10 minutes, and allowed to stand for 5 minutes. Then, a 2 g / L dopamine solution was added and the pH value was adjusted to about 9 by adding tris (hydroxymethyl) aminomethane, and stirred at room temperature for 24 hours. Then, it was taken out, rinsed with deionized water and ethanol, and dried at 80 ° C for 12 hours. The dried filter material was immersed in deionized water again, and 0.29 g cobalt chloride and 0.19 g potassium permanganate were added in sequence. The mixture was stirred at room temperature for 0.5 hours, and then transferred to a microwave oven and reacted at a certain power for 3 minutes. After the solution cooled, the filter material was taken out, rinsed with deionized water and ethanol, and dried at 80 ° C for 12 hours. The microwave-assisted deposition of Mn-CoO was obtained. x PTFE filter material with composite metal oxides.

[0050] Comparative Example 2

[0051] Immerse about 1.2 g of cleaned PTFE filter material in an ethanol solution, take it out after 10 minutes, let it stand for 5 minutes, add 2 g / L dopamine solution, adjust the pH value to about 9 by adding tris (hydroxymethyl) aminomethane, and stir it at room temperature for 24 hours. Then take it out, rinse it with deionized water and ethanol, and dry it at 80 ° C for 12 hours. Immerse the dried filter material in deionized water again, add 0.19 g of potassium permanganate, and continue stirring at room temperature for 0.5 hours. Then transfer it to a microwave oven and heat it at a certain power. The reaction was carried out for 3 minutes. After the solution was cooled, the filter material was taken out, rinsed with deionized water and ethanol, and dried at 80°C for 12 hours. The dried filter material was immersed in a 0.25 g / L sodium borohydride solution, and the pH value was adjusted to about 10 with sodium hydroxide, and stirred at room temperature for 2 hours. Finally, the filter material was taken out, rinsed with deionized water and ethanol, and placed in an oven at 80°C for vacuum drying for 12 hours to obtain a PTFE-based pure manganese oxide catalytic filter material regulated by microwave-assisted deposition and trace sodium borohydride activation.

[0052] Denitrification activity test

[0053] The catalytic filter materials prepared in the above examples and comparative examples were tested for denitrification activity. The test conditions were as follows: the volume fractions of NO and NH3 were both 0.05%, the volume fraction of O2 was 5%, and the rest was N2. The gas flow rate was 300 mL·min -1 After the airflow stabilized for 30 minutes, the concentration of nitrogen oxides at the inlet and outlet was measured using a German M60x flue gas analyzer to calculate the denitrification rate of the catalytic composite filter material. The test temperature was 160°C and 180°C. The test results are shown in the table below:

[0054]

[0055]

[0056] During the implementation of the examples, it was found that the main factors affecting the low-temperature denitration performance of the catalytic filter material of the present invention are the concentration of the dopamine solution, the molar ratio of the manganese and cobalt metal ions, the microwave duration, and the amount of sodium borohydride used. The catalyst loading gradually increased with increasing dopamine concentration, the amount of metal ions used, and the microwave duration, with the metal ion ratio having the greatest impact on activity. Furthermore, the amount of sodium borohydride used and the reaction time significantly influenced the number and structural morphology of the catalyst's surface active sites, which in turn affected its low-temperature denitration activity. When the sodium borohydride concentration exceeded 0.5 g / L, the activity decreased significantly.

[0057] The above detailed description of the analytical methods involved in the present invention provides a detailed introduction. It should be noted that the above description is intended solely to help those skilled in the art better understand the methods and concepts of the present invention, and is not intended to limit the relevant content. Without departing from the principles of the present invention, those skilled in the art may make appropriate adjustments or modifications to the present invention, and such adjustments and modifications shall also fall within the scope of protection of the present invention.

Claims

1. A method for preparing a PTFE-based manganese-cobalt bimetallic catalytic filter material, characterized in that: The catalytic filter material is prepared by using PTFE needle-punched filter material as a carrier, uniformly loading a manganese-cobalt composite metal oxide denitrification catalyst on the filter material fiber surface through surface functional modification of polydopamine and microwave-assisted deposition reaction, and simultaneously activating the catalyst layer with a trace amount of sodium borohydride.

2. The method for preparing a PTFE-based manganese-cobalt bimetallic catalytic filter material according to claim 1, wherein: The above preparation method comprises the following steps: (1) Soak the cleaned PTFE filter material in ethanol for a period of time, then take it out and let it stand; (2) immersing the filter material in step (1) in an alkaline solution of dopamine and stirring at a certain temperature for a period of time so that the surface of the filter material fiber is evenly coated with a polymer functional layer; (3) After removing the polymer-modified PTFE filter material from the solution, rinse it with deionized water and ethanol and dry it; (4) immersing the dried filter material in step (3) in deionized water, adding cobalt salt and potassium permanganate in sequence, stirring continuously at room temperature for a period of time, and then continuing to stand for a period of time; (5) transferring the entire solution containing the filter material in step (4) into a microwave oven and reacting it at a certain power for a period of time; (6) After the solution in step (5) is cooled to room temperature, the Mn-CoO x The modified PTFE filter material of the composite metal oxide catalyst is rinsed with deionized water and ethanol and then activated and dried at a certain temperature; (7) immersing the dried filter material in step (6) in an alkaline sodium borohydride solution of a certain concentration and stirring the solution at a certain temperature for a period of time to fully activate the catalytic layer; (8) After the activated PTFE filter material is taken out from the solution, it is rinsed with deionized water and ethanol and then vacuum-dried at a certain temperature to obtain the catalytic filter material.

3. The method for preparing a PTFE-based manganese-cobalt bimetallic catalytic filter material according to claim 2, wherein: The soaking time in step (1) is 0-12 hours, and the standing time is 0-2 hours; the vacuum drying temperature in step (8) is between 50-150° C., and the drying time is 0.5-48 hours.

4. The method for preparing a PTFE-based manganese-cobalt bimetallic catalytic filter material according to claim 2, wherein: The concentration of dopamine in step (2) is 0.1-10 g / L, the solvent in the alkaline solution is a mixture of deionized water and ethanol in any proportion, and one or more compounds selected from sodium hydroxide, potassium hydroxide, ammonia water or tris(hydroxymethyl)aminomethane are added thereto to adjust the pH value to between 8 and 10; the stirring temperature is between 0-100° C., and the stirring reaction time is 0.5-48 h.

5. The method for preparing a PTFE-based manganese-cobalt bimetallic catalytic filter material according to claim 2, wherein: The drying temperature in step (3) is between 50-150° C., and the drying time is between 0.5-48 h.

6. The method for preparing a PTFE-based manganese-cobalt bimetallic catalytic filter material according to claim 2, wherein: The cobalt salt described in step (4) is selected from one or more of cobalt chloride, cobalt nitrate, cobalt sulfate, cobalt phosphate and cobalt sulfite; the mass ratio of the filter material and potassium permanganate is controlled to be between 2:1-20:1, and the molar ratio of the cobalt salt to potassium permanganate is between 0:1-5:1; the stirring reaction time is 0.5-48h; and the standing time is 0.5-48h.

7. The method for preparing a PTFE-based manganese-cobalt bimetallic catalytic filter material according to claim 2, wherein: The microwave-assisted deposition reaction power in step (5) is 900 W; the microwave reaction time is 0-20 min.

8. The method for preparing a PTFE-based manganese-cobalt bimetallic catalytic filter material according to claim 2, wherein: The activation and drying temperature in step (6) is between 50-150° C., and the drying time is between 0.5-48 h.

9. The method for preparing a PTFE-based manganese-cobalt bimetallic catalytic filter material according to claim 2, wherein: In step (7), the concentration of sodium borohydride is 0-0.5 g / L, the solvent in the alkaline solution is a mixture of deionized water and ethanol in any proportion, and one or more compounds of sodium hydroxide, potassium hydroxide, ammonia water or tris(hydroxymethyl)aminomethane are added thereto to adjust the pH value to between 9 and 12; the stirring temperature is between 0-100° C., and the stirring reaction time is 0-8 h.

10. Use of the catalytic filter material prepared according to the preparation method according to any one of claims 1 to 9 in dust removal and denitrification.

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