Dust-removing and CO-removing functional filter material and preparation method thereof

Abstract

The application provides a dust removal and CO removal functional filter material, which comprises pure felt filter material and a CO removal catalyst; the CO removal catalyst is mainly Co3O4 and is assisted by CeO2, and the two jointly act. The fiber surface of the dust removal and CO removal functional filter material of the application is loaded with the CO removal catalyst, the effective components of which are Co3O4 and CeO2, and the CeO2 auxiliary catalyst can improve the low-temperature catalytic activity of the main catalyst Co3O4, and the CO removal efficiency can reach more than 90% at 180-220 DEG C.

Description

Technical Field

[0001] This invention relates to the field of flue gas purification technology, and in particular to a functional filter material for dust removal and CO removal and its preparation method. Background Technology

[0002] Industrial flue gas produces carbon monoxide due to incomplete combustion in boilers. Carbon monoxide is a toxic gas, therefore it needs to be catalytically purified before being released into the atmosphere. However, conventional dust collector filters can only remove dust from industrial flue gas and cannot catalytically purify carbon monoxide. Therefore, the need for catalytic purification of carbon monoxide in flue gas is becoming increasingly urgent.

[0003] In existing technologies, slurry coating is the most commonly used method for preparing dust removal and CO removal filter media. The preparation process involves immersing the filter media in a slurry, then drying the filter media with deposited active components and calcining it to obtain coated dust removal filter media. The properties of the slurry and the calcination temperature have a significant impact on the performance of the coated dust removal filter media.

[0004] The practical application of coated dust collector filter media may involve rapid flue gas flow, drastic temperature fluctuations, and strong mechanical vibrations. The shedding of active components can cause blockages in valves and downstream equipment, leading to a decrease in catalytic efficiency. Furthermore, traditional commercial copper-manganese coated dust collector filter media are prone to deactivation of active components in aqueous environments. Carbon deposits, dust, and high-boiling-point viscosity adhere to the surface of the active components, covering active sites and resulting in loss of catalytic activity. These problems significantly limit the widespread application of industrial flue gas CO catalytic purification technology.

[0005] The prior art, disclosed in CN103752317A, describes a method for preparing a Co3O4 / CeO2 composite oxide. The method involves slowly adding a stoichiometric mixture of cobalt nitrate and cerium nitrate to a 0.2 mol / L Na2CO3 aqueous solution, adjusting the pH to 10.0 with 0.2 mol / L NaOH, aging at this temperature for 4 hours, and then filtering. The resulting precipitate is then mixed with deionized water and stirred, and a suitable amount of H2O2 (30%) is slowly added dropwise. After aging for 1 hour, it is again filtered with deionized water, dried at 383 K for 12 hours, and calcined at 538 K for 4 hours to obtain the Co3O4 / CeO2 composite oxide. However, the prior art method for preparing the Co3O4 / CeO2 composite oxide is carried out in a normal-pressure micro-fixed-bed quartz tube reactor. The reactor outlet gas is analyzed online using an HP-6890 gas chromatograph, and a nickel converter is installed before the FID detector to quantitatively convert CO and CO2 to CH4 in a hydrogen atmosphere. Summary of the Invention

[0006] The technical problem to be solved by the present invention is how to provide a dust removal and CO removal functional filter material that, without affecting the filtration efficiency of the filter material, enables the filter material to have the performance of catalytic purification of CO.

[0007] The present invention solves the above-mentioned technical problems through the following technical means:

[0008] The first aspect of the present invention provides a dust removal and CO removal functional filter material, including pure felt filter material and a CO removal catalyst; the CO removal catalyst is Co3O4 as the main catalyst and CeO2 as the auxiliary catalyst, and the two work synergistically.

[0009] Beneficial effects: The dust removal and CO removal functional filter material of the present invention has a CO removal catalyst loaded on the fiber surface, the effective components of which are Co3O4 and CeO2. The CeO2 auxiliary catalyst can improve the low-temperature catalytic activity of the main catalyst Co3O4. At 180-220℃, the CO removal efficiency can reach more than 90%.

[0010] Preferably, a PTFE membrane is used to coat one side of the dust removal and CO removal functional filter material, making it the dust-receiving side for filtering flue gas.

[0011] Beneficial effects: The PTFE membrane of the dust removal and CO removal functional filter media can protect the catalyst on the fiber surface from being affected by dust, thereby improving the filtration efficiency and service life of the dust removal and CO removal functional filter media.

[0012] A second aspect of the present invention provides a method for preparing the above-mentioned dust removal and CO removal functional filter material, comprising the following steps:

[0013] (1) Treatment of pure felt filter media

[0014] The pure felt filter media is cleaned and dried. The dried pure felt filter media is then placed in a sensitization solution heated in a water bath for sensitization. The sensitized pure felt filter media is then placed in an activation solution heated in a water bath for activation. The sensitization solution is SnCl2 and the activation solution is PdCl2.

[0015] (2) Support of the main catalyst

[0016] After the activated pure felt filter material is cleaned and dried, it is placed in a water bath heated plating solution for reaction. A metallic Co coating is formed on the fiber surface of the pure felt filter material. After the reaction, it is dried. The plating solution is a mixed solution of CoSO4·7H2O solution, sodium hypophosphite reducing agent, trisodium citrate complexing agent, and ammonium chloride buffer.

[0017] The coated pure felt filter material is anodized, with a platinum sheet as the cathode and a mixed solution of NH4F solution and C2H6O2 solution as the electrolyte, finally forming a Co3O4 catalytic filter material;

[0018] (3) Supporting of auxiliary catalysts

[0019] The catalytic filter material was immersed in Ce(NO3)2·6H2O solution, pressed, dried and characterized to finally obtain the dust removal and CO removal functional filter material.

[0020] Beneficial effects: The preparation method of this invention first chemically plates Co onto the surface of pure felt filter material to form a metallic Co coating. The Co coating and the pure felt filter material have a strong adhesion. The pure felt filter material with the Co coating serves as the anode. After the anodic oxidation reaction, the metallic Co on the surface of the Co coating is oxidized to Co3O4. Therefore, the anode product Co3O4 is adsorbed on the surface of the Co coating, and the adhesion is strong and relatively uniform. If the Co3O4 main catalyst is loaded by impregnation, the loading strength is low and the loading distribution is uneven.

[0021] This invention uses Co3O4 as the main catalyst for CO removal and CeO2 as the auxiliary catalyst. Although CeO2 can also be used for CO removal, its main function is to increase the low-temperature catalytic activity of the main catalyst Co3O4. Therefore, the Co3O4 catalyst needs to be evenly distributed on the surface of the pure felt filter material, i.e., it is loaded by anodic oxidation. The CeO2 auxiliary catalyst needs to be in full contact with the Co3O4 main catalyst and be evenly distributed.

[0022] In the preparation method of this invention, CeO2 is generated by the decomposition of Ce(NO3)2 at 200°C. Pure felt filter material already loaded with Co3O4 is impregnated in a Ce(NO3)2 solution, whereby Ce(NO3)2 is uniformly dispersed on the surface of Co3O4. The mixture is then heated and dried at 200°C, causing Ce(NO3)2 to decompose and generate uniform CeO2. This process is simple to operate, and the concentration of Ce(NO3)2 is easy to control. Anodizing CeO2 is more cumbersome, and the concentration of each reactant solution is more difficult to control during anodizing compared to the impregnation method.

[0023] Preferably, a PTFE membrane is used to coat one side of the dust removal and CO removal functional filter material, making it the dust-receiving side for filtering flue gas.

[0024] Preferably, the water bath heating temperature in step (1) is 50-70℃; the concentration of the sensitizing solution is 8-15g / L; the concentration of the activating solution is 0.2-0.5g / L; and the sensitization and activation times are both 30-40min.

[0025] Preferably, in step (2), the concentration of CoSO4·7H2O in the plating solution is 10-20 g / L, the concentration of sodium hypophosphite as a reducing agent is 20-25 g / L, the concentration of trisodium citrate as a complexing agent is 8-15 g / L, and the concentration of ammonium chloride as a buffer is 18-25 g / L; the drying temperature is 70-85℃; and the baking temperature is 120-150℃.

[0026] Preferably, the specific operation of step (2) anodic oxidation is to place the coated pure felt filter material on the anode, with a platinum sheet as the cathode, and perform anodic oxidation at a voltage of 5-10V under stirring conditions. After the reaction is completed, the filter material is rinsed in anhydrous ethanol and then dried at 150-200℃ for 30-40 minutes to obtain Co3O4 catalytic filter material.

[0027] Preferably, the concentration of Ce(NO3)2·6H2O solution in step (3) is 90-120 g / L; and the immersion pressure is 0.20-0.50 bar.

[0028] Preferably, the drying temperature in step (3) is 200-250℃.

[0029] Preferably, the pure felt filter material is made of PTFE fibers needle-punched into felt.

[0030] The advantages of this invention are:

[0031] The dust removal and CO removal functional filter material of the present invention has a CO removal catalyst loaded on the fiber surface, the effective components of which are Co3O4 and CeO2. The CeO2 auxiliary catalyst can improve the low-temperature catalytic activity of the main catalyst Co3O4. At 180-220℃, the CO removal efficiency can reach more than 90%.

[0032] The PTFE membrane in the dust removal and CO removal functional filter media can protect the catalyst on the fiber surface from being affected by dust, thereby improving the filtration efficiency and service life of the dust removal and CO removal functional filter media.

[0033] The preparation method of this invention first involves chemically plating Co onto the surface of pure felt filter material to form a metallic Co coating. The Co coating and the pure felt filter material have a strong adhesion. The pure felt filter material with the Co coating serves as the anode. After anodizing, the metallic Co on the surface of the Co coating is oxidized to Co3O4. Therefore, the anode product Co3O4 is adsorbed on the surface of the Co coating, and the adhesion is strong and relatively uniform. If the Co3O4 main catalyst is loaded by impregnation, the loading strength is low and the loading distribution is uneven.

[0034] This invention uses Co3O4 as the main catalyst for CO removal and CeO2 as the auxiliary catalyst. Although CeO2 can also be used for CO removal, its main function is to increase the low-temperature catalytic activity of the main catalyst Co3O4. Therefore, the Co3O4 catalyst needs to be evenly distributed on the surface of the pure felt filter material, i.e., it is loaded by anodic oxidation. The CeO2 auxiliary catalyst needs to be in full contact with the Co3O4 main catalyst and be evenly distributed.

[0035] In the preparation method of this invention, CeO2 is generated by the decomposition of Ce(NO3)2 at 200°C. Pure felt filter material already loaded with Co3O4 is impregnated in a Ce(NO3)2 solution, whereby Ce(NO3)2 is uniformly dispersed on the surface of Co3O4. The mixture is then heated and dried at 200°C, causing Ce(NO3)2 to decompose and generate uniform CeO2. This process is simple to operate, and the concentration of Ce(NO3)2 is easy to control. Anodizing CeO2 is more cumbersome, and the concentration of each reactant solution is more difficult to control during anodizing compared to the impregnation method. Attached Figure Description

[0036] Figure 1 This is a morphological image of the pure felt filter media after anodizing in Example 1;

[0037] Figure 2 This is an image showing the surface morphology of the dust removal and CO removal functional filter material of Example 1 without membrane coating;

[0038] Figure 3 This is an image showing the surface morphology of the dust removal and CO removal functional filter material coated with a membrane in Example 1;

[0039] Figure 4 This is a cross-sectional micrograph of the dust removal and CO removal functional filter material coated with a membrane in Example 1;

[0040] Figure 5 This is a diagram showing the appearance of pure felt filter media impregnated with Co3O4 in Comparative Example 1. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Unless otherwise specified, all test materials and reagents used in the following examples are commercially available.

[0043] Unless otherwise specified in the embodiments, the techniques or conditions described in the literature in this field or in accordance with the product manual may be followed.

[0044] Example 1

[0045] This embodiment provides a dust removal and CO removal functional filter material and its preparation method, which includes the following steps:

[0046] Solution preparation: Sensitizing solution SnCl2 (9g / L), activating solution PdCl2 (0.3g / L), plating solution CoSO4·7H2O (15g / L), reducing agent sodium hypophosphite (23g / L), complexing agent trisodium citrate (12g / L), and buffer ammonium chloride (20g / L).

[0047] (1) Treatment of pure felt filter media

[0048] Take a 20cm×30cm pure felt filter material, wash it and dry it in an oven at 75℃. Put the sensitization solution in a water bath and heat it to 60℃. Put the washed pure felt filter material into the sensitization solution and sensitize for 35 minutes.

[0049] Heat the activation solution in a water bath to 60°C. Clean the sensitized pure felt filter material with deionized water and place it in the activation solution for 35 minutes.

[0050] (2) Support of the main catalyst

[0051] First, heat the plating solution to 60°C in a water bath. Then, clean the activated pure felt filter material with deionized water and dry it in an 80°C oven. Finally, place it in the plating solution for reaction. The Co in the plating solution... 2+ A metallic Co coating is deposited on the fiber surface. After the reaction is complete, the filter material is placed in an oven and dried at 135°C.

[0052] Preparation of electrolyte: Dissolve NH4F in water and sonicate for 8 minutes to ensure complete dissolution; then add C2H6O2 solution and heat and stir in a 45℃ water bath for 35 minutes.

[0053] Anodizing: The coated pure felt filter material was placed at the anode, with a platinum sheet as the cathode. Anodizing was performed at 8V under gentle stirring. After the reaction, the filter material was rinsed in anhydrous ethanol to remove residual C2H6O2 from the surface. It was then dried at 170℃ for 35 minutes to obtain Co3O4 catalytic filter material. The morphology of the Co3O4 catalytic filter material is as follows... Figure 1 As shown.

[0054] (3) Supporting of auxiliary catalysts

[0055] Then, the catalytic filter material was impregnated in a 100 g / L Ce(NO3)2·6H2O solution using an impregnation method. Loading was performed using a one-immersion-one-press method at a pressure of 0.35 bar. The filter material was then dried and shaped at 230℃. Ce(NO3)2 decomposes to generate CeO2 at 200℃. At this point, the fiber surface of the pure felt filter material was loaded with the effective active components of the catalyst, Co3O4 and CeO2. Therefore, dust removal and CO removal functional filter material 1 was obtained. Figure 2 As shown.

[0056] Based on the weight of the pure felt filter media, the catalyst loading on the dust removal and CO removal functional filter media 1 can be calculated to be 546 g / m³. 2 .

[0057] (4) A PTFE membrane is used to coat one side of the dust removal and CO removal functional filter media 1 to finally obtain the dust removal and CO removal functional filter media 2, such as... Figure 3 and 4 As shown.

[0058] Example 2

[0059] This embodiment provides a dust removal and CO removal functional filter material and its preparation method, which includes the following steps:

[0060] Solution preparation: sensitizing solution SnCl2 (8g / L), activating solution PdCl2 (0.2g / L), plating solution CoSO4·7H2O (10g / L), reducing agent sodium hypophosphite (20g / L), complexing agent trisodium citrate (8g / L), and buffer ammonium chloride (18g / L).

[0061] (1) Treatment of pure felt filter media

[0062] Take a 20cm×30cm pure felt filter material, wash it and dry it in an oven at 60℃. Put the sensitization solution in a water bath and heat it to 50℃. Put the washed pure felt filter material into the sensitization solution and sensitize for 40 minutes.

[0063] Heat the activation solution in a water bath to 50°C. Clean the sensitized pure felt filter material with deionized water and place it in the activation solution for 40 minutes.

[0064] (2) Support of the main catalyst

[0065] First, heat the plating solution to 50°C in a water bath. Then, clean the activated pure felt filter material with deionized water and dry it in a 70°C oven. Finally, place it in the plating solution for reaction. The Co in the plating solution... 2+ A metallic Co coating is deposited on the fiber surface. After the reaction is complete, the filter material is placed in an oven and dried at 120°C.

[0066] Preparation of electrolyte: Dissolve NH4F in water and sonicate for 5 minutes to ensure complete dissolution; then add C2H6O2 solution and heat and stir in a 40℃ water bath for 30 minutes.

[0067] Anodizing: The coated pure felt filter material is placed at the anode and a platinum sheet is used as the cathode. Anodizing is carried out at 5V under weak stirring. After the reaction is completed, the filter material is rinsed in anhydrous ethanol to remove the residual C2H6O2 on the surface. It is then dried at 150℃ for 40min to obtain Co3O4 catalytic filter material.

[0068] (3) Supporting of auxiliary catalysts

[0069] Then, the catalytic filter material was immersed in a 90 g / L Ce(NO3)2·6H2O solution using an impregnation method. The loading was carried out by a one-immersion-one-press method with a pressure of 0.20 bar. The filter material was then dried and shaped at 200℃. Ce(NO3)2 can decompose to generate CeO2 at 200℃. At this time, the fiber surface of the pure felt filter material has been loaded with the effective active components of the catalyst, Co3O4 and CeO2. Therefore, the dust removal and CO removal functional filter material 3 was obtained.

[0070] Based on the weight of the pure felt filter media, the catalyst loading on the dust removal and CO removal functional filter media 3 can be calculated to be 563 g / m³. 2 .

[0071] Example 3

[0072] This embodiment provides a dust removal and CO removal functional filter material and its preparation method, which includes the following steps:

[0073] Solution preparation: Sensitizing solution SnCl2 (15g / L), activating solution PdCl2 (0.5g / L), plating solution CoSO4·7H2O (20g / L), reducing agent sodium hypophosphite (25g / L), complexing agent trisodium citrate (15g / L), and buffer ammonium chloride (25g / L).

[0074] (1) Treatment of pure felt filter media

[0075] Take a 20cm×30cm pure felt filter material, wash it and dry it in an oven at 80℃. Put the sensitization solution in a water bath and heat it to 70℃. Put the washed pure felt filter material into the sensitization solution and sensitize for 30 minutes.

[0076] Heat the activation solution in a water bath to 70°C. Clean the sensitized pure felt filter material with deionized water and place it in the activation solution for 30 minutes.

[0077] (2) Support of the main catalyst

[0078] First, heat the plating solution to 70°C in a water bath. Then, clean the activated pure felt filter material with deionized water and dry it in an 85°C oven. Finally, place it in the plating solution for reaction. The Co in the plating solution... 2+ A metallic Co coating is deposited on the fiber surface. After the reaction is complete, the filter material is placed in an oven and dried at 150°C.

[0079] Preparation of electrolyte: Dissolve NH4F in water and sonicate for 10 min to ensure complete dissolution; then add C2H6O2 solution and heat and stir in a 50℃ water bath for 40 min.

[0080] Anodizing: The coated pure felt filter material is placed at the anode and a platinum sheet is used as the cathode. Anodizing is carried out at 10V under weak stirring. After the reaction is completed, the filter material is rinsed in anhydrous ethanol to remove the residual C2H6O2 on the surface. It is then dried at 200℃ for 30 minutes to obtain Co3O4 catalytic filter material.

[0081] (3) Supporting of auxiliary catalysts

[0082] Then, the catalytic filter material was immersed in a 120 g / L Ce(NO3)2·6H2O solution using an impregnation method. The loading was carried out by a one-immersion-one-press method with a pressure of 0.50 bar. The filter material was then dried and shaped at 250℃. Ce(NO3)2 can decompose to generate CeO2 at 200℃. At this time, the fiber surface of the pure felt filter material has been loaded with the effective active components of the catalyst, Co3O4 and CeO2. Therefore, the dust removal and CO removal functional filter material 4 was obtained.

[0083] Based on the weight of the pure felt filter media, the catalyst loading on the dust removal and CO removal functional filter media 4 can be calculated to be 524 g / m³. 2 .

[0084] Comparative Example 1

[0085] The dust removal and CO removal functional filter material and its preparation method provided in this comparative example are as follows:

[0086] (1) Treatment of pure felt filter media

[0087] Take a 20cm×30cm piece of pure felt filter material, wash it, and dry it in an oven at 75℃.

[0088] (2) Support of the main catalyst

[0089] A catalyst slurry with a solid content of 30% was prepared: 200-mesh Co3O4 powder was added to deionized water and stirred thoroughly; then, 5 wt% PTFE emulsion and 5 wt% penetrant were added to the slurry, and the mixture was stirred for 10 minutes to obtain the Co3O4 slurry. Dry pure felt filter media was immersed in the Co3O4 slurry using a one-immersion-one-press loading method at a pressure of 0.25 bar. The loaded filter media was then dried and shaped at 150℃ to obtain the Co3O4 catalytic filter media. Finally, the morphology of the pure felt filter media treated by the impregnation method was observed using an electron microscope, as shown below. Figure 5 As shown.

[0090] according to Figure 1 and Figure 3 The comparison shows that Co3O4 prepared by anodizing is more uniformly distributed on pure felt filter media than that prepared by impregnation.

[0091] (3) Supporting of auxiliary catalysts

[0092] Then, the catalytic filter material was immersed in a 100 g / L Ce(NO3)2·6H2O solution using an impregnation method. The loading was carried out by a one-immersion-one-press method with a pressure of 0.35 bar. The filter material was then dried and shaped at 230℃. Ce(NO3)2 can decompose to generate CeO2 at 200℃. At this time, the fiber surface of the pure felt filter material has been loaded with the effective active components of the catalyst, Co3O4 and CeO2. Therefore, the dust removal and CO removal functional filter material 5 was obtained.

[0093] Experimental Example

[0094] The denitrification evaluation method for dust removal and CO removal functional filter media was tested through a self-built denitrification test platform. The flue gas CO removal evaluation device consists of a gas supply section, a catalytic reaction section, a gas analysis section, and a gas discharge section.

[0095] Simulated flue gas tests were conducted on the different dust removal and CO removal functional filter materials prepared in Examples 1-3 and Comparative Example 1, with a volume of 2.5 cm³. 3 The dust removal and CO removal functional filter media (cut into 4cm diameter circular pieces) is placed in a glass tube, which is then placed in a tubular furnace. Simulated working condition flue gas (flue gas space velocity 15000 h⁻¹) is introduced into the glass tube. -1 Mixed gas: NOx (200 mg / m³) 3 ), CO (3500mg / m³) 3 (15% oxygen content, the rest of the gas is argon) The test was conducted at a temperature of 160℃-240℃, and the conversion rate of CO was recorded. The test results are shown in Table 1.

[0096]

[0097] Table 1

[0098] As shown in Table 1, the CO removal efficiencies of functional filter media 1, 3, and 4 are very similar, indicating strong repeatability of the technical solutions. Compared with the previous three, the CO removal efficiency of the Co3O4 catalytic filter media in Example 1 is lower, because CeO2 can significantly increase the low-temperature activity of Co3O4.

[0099] As shown in Table 1, at the same temperature, the CO removal efficiency of the Co3O4 catalytic filter material in Example 1 is 8-10% higher than that of the Co3O4 catalytic filter material in Comparative Example 1. The CO removal efficiency of the dust removal and CO removal functional filter material 1 in Example 1 is 8-15% higher than that of the dust removal and CO removal functional filter material 5 in Comparative Example 1. This is because the Co3O4 catalyst prepared by the anodic oxidation method is more evenly distributed on the surface of the pure filter material, resulting in an increased contact area between the flue gas and the Co3O4 catalyst. Therefore, the anodic oxidation method is superior to the impregnation method.

[0100] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a dust removal and CO removal functional filter material, characterized in that, This includes pure felt filter media and CO removal catalyst; the CO removal catalyst is based on Co3O4 as the main catalyst and CeO2 as the auxiliary catalyst. The preparation method includes the following steps: (1) Treatment of pure felt filter media The pure felt filter media is washed and dried. The dried pure felt filter media is placed in a sensitization solution heated in a water bath for sensitization. After sensitization, the pure felt filter media is washed and then placed in an activation solution heated in a water bath for activation. The sensitization solution is SnCl2 and the activation solution is PdCl2. (2) Support of the main catalyst After the activated pure felt filter material is cleaned and dried, it is placed in a water bath heated plating solution for reaction. A metallic Co coating is formed on the fiber surface of the pure felt filter material. After the reaction, it is dried. The plating solution is a mixed solution of CoSO4·7H2O solution, sodium hypophosphite reducing agent, trisodium citrate complexing agent, and ammonium chloride buffer. The coated pure felt filter material is anodized, with a platinum sheet as the cathode and a mixed solution of NH4F solution and C2H6O2 solution as the electrolyte, finally forming a Co3O4 catalytic filter material; (3) Supporting of auxiliary catalyst The catalytic filter material was immersed in Ce(NO3)2·6H2O solution, pressed, dried and shaped to finally obtain the dust removal and CO removal functional filter material.

2. The method for preparing the dust removal and CO removal functional filter material according to claim 1, characterized in that, A PTFE membrane is used to coat one side of the dust removal and CO removal functional filter material, making it the dust-receiving side for filtering flue gas.

3. The method for preparing the dust removal and CO removal functional filter material according to claim 1, characterized in that, Step (1) The water bath heating temperature is 50-70℃; the concentration of the sensitization solution is 8-15g / L; the concentration of the activation solution is 0.2-0.5g / L; the sensitization and activation times are both 30-40min.

4. The method for preparing the dust removal and CO removal functional filter material according to claim 1, characterized in that, Step (2): The concentration of CoSO4·7H2O in the plating solution is 10-20 g / L, the concentration of sodium hypophosphite as a reducing agent is 20-25 g / L, the concentration of trisodium citrate as a complexing agent is 8-15 g / L, and the concentration of ammonium chloride as a buffer is 18-25 g / L; the drying temperature is 70-85℃; and the baking temperature is 120-150℃.

5. The method for preparing the dust removal and CO removal functional filter material according to claim 1, characterized in that, Step (2) The specific operation of anodizing is to place the coated pure felt filter material on the anode and the platinum sheet as the cathode. Under stirring conditions, anodize with a voltage of 5-10V. After the reaction is completed, the filter material is rinsed in anhydrous ethanol and then dried at 150-200℃ for 30-40min to obtain Co3O4 catalytic filter material.

6. The method for preparing the dust removal and CO removal functional filter material according to claim 1, characterized in that, In step (3), the concentration of Ce(NO3)2·6H2O solution is 90-120 g / L; the immersion pressure is 0.20-0.50 bar.

7. The method for preparing the dust removal and CO removal functional filter material according to claim 1, characterized in that, The drying temperature in step (3) is 200-250℃.

8. The method for preparing the dust removal and CO removal functional filter material according to claim 1, characterized in that, Pure felt filter media is made of PTFE fibers needle-punched into felt.

9. A method for preparing a dust removal and CO removal functional filter material as described in any one of claims 1-8.

Images