Composite metal filter material

Abstract

The invention discloses a composite metal filter material. Comprising a high-temperature-resistant filter material shell, a catalytic inner core with a catalytic oxidation function and an upper end cover, the shell is a filter cartridge made of metal fibers, and a metal clamping block is arranged at the upper part of the filter cartridge; the catalytic inner core is a metal net cylinder loaded with active components, a metal clamping block is arranged on the upper portion of the metal net cylinder, and the upper end cover is provided with an inner clamping ring and an outer clamping ring which are connected with the metal clamping block of the shell and the metal clamping block of the catalytic inner core respectively. The active component is one or more of Pt-Pd-Rh-Mo-Sn-Ce-Zr / TiO2, Pt-Pd-Rh-Mo-Sn-Ce-Zr / Al2O3, and Pt-Pd-Rh-Mo-Sn-Ce-Zr / MnO2, and the active component is one or more of the following components: Pt-Pd-Rh-Mo-Sn-Ce-Zr / MnO2; the loading amount of the active component is 30 to 100g / L; wherein the mass fractions of the Pt, the Pd, the Rh, the Mo, the Sn, the Ce and the Zr relative to the carrier are 0.1 to 1.5 percent, 0 to 1.5 percent, 0 to 0.25 percent, 0.5 to 5 percent, 0.5 to 15 percent, 0 to 10 percent and 0 to 15 percent; the filter cartridge and the catalytic inner core are prepared respectively, and then the integrated catalytic filter material is obtained in a combined mode. Accurate control over active component uploading is achieved, contact between harmful substances in smoke and the active components is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial flue gas treatment, and particularly relates to a composite metal filter material. Background Art

[0002] Industrial flue gases such as those from iron and steel sintering and electric arc furnace steelmaking contain a large amount of dust (PM), dioxins (PCDD / Fs), and carbon monoxide (CO), which need to be purified before being discharged into the atmosphere.

[0003] Traditionally, in industry, the dust removal and catalytic oxidation units are generally operated in series. This method has a long process flow, large equipment scale, high investment and operation and maintenance costs, and does not meet the current development needs of industrial energy conservation and carbon reduction.

[0004] Currently, PM is mainly captured and filtered by a dust collector, and the filtering element is a filter material.

[0005] PCDD / Fs and CO are reacted and eliminated by the catalytic oxidation method, and the catalytic oxidation element is a catalytically active component.

[0006] If the functions of the filter material and the catalytically active component can be combined, while using the filter material to filter the dust in the flue gas, the catalytic oxidation ability of the active component is used to eliminate PCDD / Fs and CO, then a composite filter material with dual catalytic oxidation and filtering functions can be obtained. Summary of the Invention

[0007] The purpose of the present invention is to provide a composite metal filter material with dual catalytic oxidation functions to simultaneously eliminate PM, PCDD / Fs, and CO.

[0008] The technical solution of the present invention is: a composite metal filter material, including a high-temperature resistant filter material shell, a catalytic inner core with catalytic oxidation function, and an upper end cover. The shell and the catalytic inner core are respectively fixedly connected to the upper end cover; the shell is a filter cylinder made of metal fibers, and a metal clamping block is provided on the upper part of the filter cylinder, and the metal clamping block is fixedly connected to the upper end cover; the catalytic inner core is a metal mesh cylinder loaded with an active component, and a metal clamping block is provided on the upper part of the metal mesh cylinder, and the metal clamping block is fixedly connected to the upper end cover; the active component is Pt-Pd-Rh-Mo-Sn-Ce-Zr / TiO 2 、Pt-Pd-Rh-Mo-Sn-Ce-Zr / Al 2 O 3 、Pt-Pd-Rh-Mo-Sn-Ce-Zr / MnO 2one or more of the above; the loading amount of the active components is between 30 and 100 g / L; wherein the mass fractions of Pt, Pd, Rh, Mo, Sn, Ce, and Zr elements relative to the carrier are between 0.1% and 1.5%, 0% and 1.5%, 0% and 0.25%, 0.5% and 5%, 0.5% and 15%, 0% and 10%, and 0% and 15%; the upper end cover is provided with two layers of snap rings, which are respectively connected to the metal blocks of the outer shell and the catalytic inner core; the filter cartridge and the catalytic inner core are prepared separately and then combined to obtain an integrated catalytic filter material.

[0009] In the technical solution of the present invention: the preparation method of the filter cartridge is as follows: (1) Mix one or more of stainless steel powders numbered 201, 202, 304, 310s, 316, 321, 410, 420, and 430 with a particle size less than 300 mesh, one or more of aluminum sol, silica sol, low-melting glass powder, and hydroxypropyl methylcellulose binder, and deionized water, and stir in a mixer at room temperature for 30 to 80 minutes to obtain a mixed material; wherein, the mass percentages of stainless steel powder, binder, and deionized water are: 60% to 75%, 10% to 20%, and 5% to 20%; (2) Put the uniformly stirred mixed material into a press and press the mixed material into a metal felt board with a thickness between 0.5 and 3 mm under a pressure of 20 to 50 tons; (3) Put the metal felt board into a horizontal rolling machine and bend the metal felt material into a cylindrical shape with a diameter between 150 and 600 mm at a rolling speed of 2 to 5 m / min, and connect the edges of the felt material by welding to obtain a metal felt cylinder; (4) Put the metal felt cylinder into a kiln and calcine it at 800 to 1200 °C for 0.5 to 2 h; (5) Weld a metal sealing plate at the bottom of the calcined metal felt cylinder to play a sealing role, and weld a metal block at the top for connection with the upper end cover.

[0010] In the technical solution of the present invention: the preparation method of the catalytic inner core is as follows: (1) Prepare an oxide carrier: Mix one or more of Pt precursor, Pd precursor, Rh precursor, Ce precursor, Mo precursor, Zr precursor, and Sn precursor with deionized water, and stir at room temperature for 20 to 40 min to obtain a uniform solution; the MnO with a particle size less than 200 mesh 2 , Al 2 O 3 and TiO 2One kind of powder is added to the above solution, and stirred at 80 - 130 °C until the water in the solution is completely evaporated to obtain a solid; the above solid is crushed into powder and then put into a muffle furnace, and calcined at 400 - 600 °C for 3 - 6 h to obtain the prepared oxide carrier; (2) Prepare the active component slurry: Add one or several of the oxide carrier, aluminum sol, silicon sol and hydroxymethyl cellulose to deionized water, and stir at room temperature for 20 - 50 min. Put the mixed solution into a ball mill tank and ball mill at 300 - 700 r / min for 0.5 - 4 h; Add one or several of the Pt precursor, Pd precursor, Rh precursor to the ball milled solution to obtain the prepared active component slurry; (3) Prepare the catalytic oxidation active core: Immerse the metal mesh cylinder in the prepared active component solution for 5 - 30 s, put it into an oven and dry at 90 - 120 °C for 20 - 60 min, and then put it into a muffle furnace and calcine at 400 - 600 °C for 3 - 6 h; Weld a metal clamping block on the top of the calcined metal mesh cylinder for connection with the upper end cover.

[0011] In the technical solution of the present invention: The Pt precursor, Pd precursor, Rh precursor, Ce precursor, Mo precursor, Zr precursor, Sn precursor are water-soluble compounds, including platinum nitrate, palladium nitrate, rhodium nitrate, cerium nitrate, ammonium molybdate, zirconium acetate and tin acetate.

[0012] In the technical solution of the present invention: The wall thickness of the filter cartridge is between 0.5 - 3 mm, the diameter is between 150 - 600 mm, the height is between 600 - 3000 mm, the porosity is between 75 - 90%, and the average pore diameter on the surface of the filter material is between 1 - 5 μm.

[0013] In the technical solution of the present invention: The wall thickness of the metal mesh cylinder is between 0.2 - 3 mm, the diameter is between 100 - 450 mm, the height is between 400 - 2800 mm, and the mesh number is between 150 - 600 meshes.

[0014] In the technical solution of the present invention: The preparation method of the integrated catalytic filter material is as follows: (1) Select an upper end cover with a suitable size according to the diameter of the catalytic core and the filter housing; (2) Connect and fix the catalytic core and the housing to the upper end cover through the top clamping blocks respectively, and put a polytetrafluoroethylene sealing ring at the connection between the upper end cover and the housing to obtain the integrated catalytic filter material.

[0015] The beneficial technical effect of the present invention is: (1) The composite metal filter uses an external filter to filter out dust and solid impurities in the flue gas. The purified flue gas then reacts with the catalytic inner core in the filter to eliminate PCDD / Fs and CO in the flue gas. This method can not only eliminate three pollutants simultaneously, but also effectively utilize the temperature rise of the CO oxidation reaction to enhance the removal effect of PCDD / Fs, achieving the efficient co-removal of these two pollutants. (2) The preparation method described is to separately prepare the filter shell with filtering function and the catalytic inner core of the active component, and then obtain the integrated catalytic filter through a combination method. This method not only effectively solves the problem of difficult compounding of the metal filter and the active component, realizes the precise control of the loading of the active component, but also reduces the contact between harmful substances in the flue gas and the active component, prolonging the service life. Description of the Drawings

[0016] Figure 1 It is a structural diagram of a composite metal filter.

[0017] In the figure: 1 - upper end cap; 2 - outer shell; 3 - catalytic inner core. Detailed Embodiments

[0018] The present invention will be further described below in conjunction with embodiments, but the protection scope of the present invention is not limited thereto.

[0019] A composite metal filter includes a high-temperature resistant filter outer shell 2, a catalytic inner core 3 with catalytic oxidation function, and an upper end cap 1. The outer shell 2 and the catalytic inner core 3 are respectively fixedly connected to the upper end cap 1. The outer shell 2 is a filter cartridge made of metal fibers. The upper part of the filter cartridge is provided with a metal clamping block, and the metal clamping block is fixedly connected to the upper end cap 1. The catalytic inner core 3 is a metal mesh cylinder loaded with an active component. The upper part of the metal mesh cylinder is provided with a metal clamping block, and the metal clamping block is fixedly connected to the upper end cap 1. The active component is one or several of Pt-Pd-Rh-Mo-Sn-Ce-Zr / TiO 2 , Pt-Pd-Rh-Mo-Sn-Ce-Zr / Al 2 O 3 , Pt-Pd-Rh-Mo-Sn-Ce-Zr / MnO 2 . The loading amount of the active component is between 30 and 100 g / L. The mass fractions of Pt, Pd, Rh, Mo, Sn, Ce, and Zr elements relative to the carrier are between 0.1% and 1.5%, 0% and 1.5%, 0% and 0.25%, 0.5% and 5%, 0.5% and 15%, 0% and 10%, and 0% and 15% respectively. The upper end cap 1 is provided with two inner and outer clamping rings, which are respectively connected to the metal clamping blocks of the outer shell 2 and the catalytic inner core 3. The filter cartridge and the catalytic inner core 3 are separately prepared, and then the integrated catalytic filter is obtained through a combination method.

[0020] The preparation method of the filter cartridge is as follows: (1) Mix one or more of stainless steel powders with labels 201, 202, 304, 310s, 316, 321, 410, 420, and 430 with a particle size less than 300 mesh, one or more of aluminum sol, silica sol, low melting point glass powder, and hydroxypropyl methylcellulose binder, and deionized water, and stir in a mixer at room temperature for 30 - 80 minutes to obtain a mixed material; among them, the mass percentages of stainless steel powder, binder, and deionized water are: 60 - 75%, 10 - 20%, and 5 - 20%; (2) Put the evenly stirred mixed material into a press, and press the mixed material into a metal felt board with a thickness between 0.5 - 3 mm under a pressure of 20 - 50 tons; (3) Put the metal felt board into a horizontal plate rolling machine, bend the metal felt material into a cylindrical shape with a diameter between 150 - 600 mm at a plate rolling speed of 2 - 5 m / min, and connect the edges of the felt material by welding to obtain a metal felt cylinder; (4) Put the metal felt cylinder into a kiln and calcine it at 800 - 1200 °C for 0.5 - 2 h; (5) Weld a metal sealing plate at the bottom of the calcined metal felt cylinder to play a sealing role, and weld a metal fixture at the top for connection with the upper end cover.

[0021] The preparation method of the catalytic inner core is as follows: (1) Prepare an oxide support: Mix one or more of Pt precursor, Pd precursor, Rh precursor, Ce precursor, Mo precursor, Zr precursor, and Sn precursor with deionized water, and stir at room temperature for 20 - 40 min to obtain a uniform solution; add one of the powders of MnO 2 , Al 2 O 3 and TiO 2 with a particle size less than 200 mesh into the above solution, stir at 80 - 130 °C until the water in the solution is completely evaporated to obtain a solid; crush the above solid into powder and put it into a muffle furnace, and calcine it at 400 - 600 °C for 3 - 6 h to obtain the prepared oxide support; (2) Prepare an active component slurry: Add the oxide support, one or more of aluminum sol, silica sol, and hydroxymethylcellulose to deionized water, and stir at room temperature for 20 - 50 min. Put the mixed solution into a ball mill tank and ball mill it at 300 - 700 r / min for 0.5 - 4 h; add one or more of Pt precursor, Pd precursor, and Rh precursor to the ball milled solution to obtain the prepared active component slurry; (3) Preparation of the catalytic oxidation active core: Immerse the metal mesh cylinder in the prepared active component solution for 5 - 30 s, then place it in an oven and dry at 90 - 120 °C for 20 - 60 min. After drying, put it into a muffle furnace and calcine at 400 - 600 °C for 3 - 6 h; weld a metal clamping block on the top of the calcined metal mesh cylinder for connection with the upper end cap.

[0022] The Pt precursor, Pd precursor, Rh precursor, Ce precursor, Mo precursor, Zr precursor, and Sn precursor are water-soluble compounds, including platinum nitrate, palladium nitrate, rhodium nitrate, cerium nitrate, ammonium molybdate, zirconium acetate, and tin acetate.

[0023] The wall thickness of the filter cartridge is between 0.5 - 3 mm, the diameter is between 150 - 600 mm, the height is between 600 - 3000 mm, the porosity is between 75 - 90%, and the average pore diameter on the surface of the filter media is between 1 - 5 μm.

[0024] The wall thickness of the metal mesh cylinder is between 0.2 - 3 mm, the diameter is between 100 - 450 mm, the height is between 400 - 2800 mm, and the mesh number is between 150 - 600 meshes.

[0025] The preparation method of the integrated catalytic filter media is as follows: (1) Select an upper end cap 1 with a suitable size according to the diameters of the catalytic core 3 and the filter media housing 2. (2) Connect and fix the catalytic core 3 and the housing 2 to the upper end cap 1 respectively through the top clamping blocks, and put a polytetrafluoroethylene sealing ring on the connection between the upper end cap 1 and the housing 2 to obtain the integrated catalytic filter media.

[0026] Example 1.

[0027] A composite metal filter media, the preparation method is as follows.

[0028] Step 1. Preparation of the metal filter media housing 2.

[0029] Load 5 kg of 304s metal powder with a particle size less than 200 meshes, 1.5 kg of neutral silica sol, 1.5 kg of low-melting glass powder, and 0.5 kg of deionized water into a mixer in sequence, and stir at room temperature for 40 min to obtain a uniformly mixed dry material.

[0030] Put the dry material into a press and press it into a metal felt board with a thickness of about 1.2 mm and a length of about 800 mm under a pressure of 30 tons.

[0031] Put the metal felt sheet into a horizontal plate rolling machine, and bend the metal felt material into a cylinder with a diameter of about 200 mm at a plate rolling speed of 3.5 m / min. Use laser welding to connect both sides of the metal felt sheet to obtain a metal felt cylinder.

[0032] Put the metal felt cylinder into a kiln and calcine it at 1000 °C for 1.2 h. After the metal felt cylinder cools down, laser weld a circular metal sealing plate at the bottom of the felt cylinder. The metal sealing plate is made of 304s, with a thickness of 2.5 mm and a diameter of 405 mm. Laser weld 4 metal blocks at the top of the felt cylinder. The metal blocks are made of 304s and have a height of 25 mm.

[0033] Step 2. Preparation of the active component slurry.

[0034] Add 2.325 kg of cerium nitrate hexahydrate, 2.666 kg of zirconium acetate, and 6.470 kg of ammonium molybdate tetrahydrate to 15 L of deionized water, and stir for 30 min at room temperature to obtain a homogeneous solution. Add 10 kg of Al 2 O 3 powder to the above solution, and stir at 120 °C for 36 hours until the water in the solution is completely evaporated to obtain a solid.

[0035] The specific surface area of the Al 2 O 3 powder is greater than 180 m 2 / g, the purity is not less than 99.9%, and the particle size is 325 mesh.

[0036] Crush the above solid and place it in a ball mill jar, and ball mill for 0.5 h at a rotation speed of 400 r / min to obtain a powder.

[0037] Put the above powder into a muffle furnace and calcine it at 550 °C for 4.5 h to obtain a CeO 2 -ZrO 2 -MoO 3 -Al 2 O 3 oxide carrier. The mass fractions of Ce, Zr, and Mo elements relative to Al 2 O 3 are 7.5%, 7.5%, and 5% respectively.

[0038] Put 8 kg of the above oxide carrier, 2 kg of aluminum sol (Al 2 O 3 with a mass fraction of 20%, a pH of 4 - 5, and a D90 of 10 nm) and 30 kg of deionized water into a ball mill jar, and ball mill for 2 h at a rotation speed of 500 r / min to obtain a homogeneous slurry.

[0039] Take the above 30 kg of the above slurry, and add 51.7 g of platinum nitrate and 32.6 g of palladium nitrate thereto. Stir well at room temperature for 30 min to obtain an active component slurry. The mass fractions of Pt and Pd elements relative to CeO 2 -ZrO 2 -MoO 3 -Al 2 O 3 oxide support are 0.52% and 0.25% respectively.

[0040] Step 3. Preparation of the catalytically active core.

[0041] Immerse a metal mesh cylinder with a thickness of 1.5 mm, a diameter of 120 mm, and a length of 400 mm in the active component slurry. Lift the metal mesh cylinder after 15 s, and transfer it to an oven when no slurry drips from the cylinder.

[0042] After drying at 100 °C in the oven for 45 min, transfer it to a muffle furnace and calcine at 500 °C for 4 h.

[0043] Weld 4 metal blocks on the top of the calcined metal mesh cylinder. The material of the metal blocks is 304s and the height is 25 mm.

[0044] Step 4. Preparation of the integrated catalytic oxidation filter material.

[0045] Select a circular metal end cap with an outer diameter of 165 mm and an inner diameter of 95 mm. Weld a clamping groove at a suitable position on the end cap, and connect and fix it successively with the catalytically active core prepared in Step 3 and the metal blocks on the top of the metal filter housing prepared in Step 1.

[0046] Put on a polytetrafluoroethylene sealing ring with an inner diameter of 168 mm and an outer diameter of 170 mm at the connection between the upper end cap and the filter housing to obtain the integrated catalytic oxidation filter material.

[0047] Example 2.

[0048] Steps 1, 3, and 4 of this example are the same as those of Example 1, and Step 2 is different. Specifically,

[0049] Step 1. The same as Example 1.

[0050] Step 2. Preparation of the active component slurry.

[0051] Add 9.710 kg of ammonium molybdate tetrahydrate to 10 L of deionized water, and stir at room temperature for 30 min to obtain a uniform solution. Add 10 kg of TiO 2 powder thereto, and stir at 120 °C for 24 hours until the water in the solution is completely evaporated to obtain a solid.

[0052] The described TiO 2 powder has a rutile crystal form, a specific surface area greater than 70 m 2 / g, a purity of not less than 95%, a particle size of 325 mesh, and a pH between 6 and 8. The above solid is crushed and placed in a ball mill tank, and ball milled at a rotation speed of 300 r / min for 0.5 h to obtain a powder.

[0053] Transfer the above powder to a muffle furnace and calcine at 450 °C for 3 h to obtain MoO 3 -TiO 2 oxide support. The mass fraction of Mo element relative to Al 2 O 3 is 7.5% respectively. Place 8 kg of the above oxide support, 3 kg of neutral silica sol (SiO 2 with a mass fraction of 25%, a pH of 4 - 5, and a particle size of 10 - 20 nm) and 30 kg of deionized water in a ball mill tank, and ball mill at a rotation speed of 500 r / min for 2 h to obtain a uniform slurry.

[0054] Take 30 kg of the above slurry, and add 51.7 g of platinum nitrate and 120.3 g of rhodium nitrate solution (Rh mass fraction is 10%) into it, and stir well at room temperature for 30 min to obtain an active component slurry. The mass fractions of Pt and Rh elements relative to MoO 3 -TiO 2 oxide support are 0.52% and 0.15% respectively.

[0055] Step 3. The same as in Example 1.

[0056] Step 4. The same as in Example 1.

[0057] The samples prepared in Example 1 and Example 2 are tested for their performance according to the following procedure.

[0058] Use a self-made dust collector test platform to test the active component shedding rate of the samples prepared in Example 1 and Example 2.

[0059] Put 1 sample into the dust collector test platform, manually open the pulse valve to blow the sample, the blowing pressure is 0.3 - 0.5 MPa, and blow continuously for 100 times. The greater the mass of the sample after blowing and the smaller the mass of the shed active component, the higher the loading firmness.

[0060] Active component shedding rate = (m 0 -m 1 ) / m 0 ×100% In the formula, m 0 is the mass of the sample before blowing, and m 1 is the mass of the sample after blowing.

[0061] The test results of the shedding rate of the active components of the samples are shown in Table 1.

[0062] Table 1 Test results of the shedding rate of the active components of the samples.

[0063] 。

[0064] The filtration performance of the samples was tested using a self-made dust collector test platform. The test dust was a dust standard sample (the D50 of coal fly ash was 7.5 μm).

[0065] Dust filtration efficiency = (D 0 - D 1 ) / D 0 × 100% In the formula, D 0 is the dust inlet concentration, and D 1 is the dust outlet concentration.

[0066] The test pieces for filtration performance are shown in Table 2.

[0067] Table 2 Test conditions for the filtration performance of the samples.

[0068] 。

[0069] The test results of the filtration performance of the samples are shown in Table 3.

[0070] Table 3 Test results of the filtration performance of the samples.

[0071] 。

[0072] The CO and PCDD / Fs removal performance of the samples prepared in Examples 1 and 2 was tested using a self-made dust collector test platform. Chlorobenzene (C 6 H 5 Cl) was used as a substitute for PCDD / Fs.

[0073] Two samples were placed in the dust collector test platform. After CO, C 6 H 5 Cl, O 2 and N 2 were mixed evenly in a mixer, they were quickly heated to the reaction temperature in a pipeline heater and then introduced into the dust collector to react with the samples.

[0074] The reaction test conditions were: reaction air velocity 1 m / min, reaction temperature 220 - 280 °C, CO concentration 4000 ppm, chlorobenzene concentration 200 ppm, O 2 concentration 20%, N 2 as the balance gas. The inlet and outlet CO and C 6 H 5The Cl concentration was measured by an MKS gas analyzer.

[0075] CO removal efficiency = (C 0 - C 1 ) / C 0 × 100% where C 0 is the CO inlet concentration and C 1 is the CO outlet concentration.

[0076] C 6 H 5 Cl removal efficiency = (N 0 - N 1 ) / N 0 × 100% where N 0 is the C 6 H 5 Cl inlet concentration and N 1 is the C 6 H 5 Cl outlet concentration.

[0077] The CO and C 6 H 5 Cl removal performance test results of the samples are shown in Table 4.

[0078] Table 4 CO and C 6 H 5 Cl removal performance test results of the samples.

[0079] .

[0080] From the results in Table 1, it can be seen that the active component firmness of the samples in Examples 1 and 2 is good and they can be applied to the operating conditions of the dust collector.

[0081] From the results in Tables 2 and 3, it can be seen that through the actual tests of the dust removal efficiency and CO removal rate of the samples in Examples 1 and 2 and the removal rate test of the PCDD / Fs analog C 6 H 5 Cl, the prepared integrated catalytic oxidation filter material has excellent dust removal efficiency and CO and PCDD / Fs removal performance. At a filtration air velocity of 1 m / min, the dust removal efficiency is as high as over 99.98%, the CO removal efficiency can reach over 80% at 280 °C, and the PCDD / Fs removal efficiency can reach over 80% at 220 °C, showing good dust filtration and dual catalytic oxidation functions.

Claims

1. A composite metal filter material, characterized in that It comprises a high temperature resistant filter material shell, a catalytic inner core with catalytic oxidation function, and an upper end cover, wherein the shell and the catalytic inner core are respectively fixedly connected to the upper end cover; the shell is a filter cartridge made of metal fiber, a metal block is provided on the upper part of the filter cartridge, and the metal block is fixedly connected to the upper end cover; the catalytic inner core is a metal mesh cylinder loaded with active components, a metal block is provided on the upper part of the metal mesh cylinder, and the metal block is fixedly connected to the upper end cover; the active component is one or more of Pt-Pd-Rh-Mo-Sn-Ce-Zr / TiO2, Pt-Pd-Rh-Mo-Sn-Ce-Zr / Al2O3, Pt-Pd-Rh-Mo-Sn-Ce-Zr / MnO2; the loading amount of the active component is 30~100 g / L; wherein the mass fraction of Pt, Pd, Rh, Mo, Sn, Ce and Zr elements relative to the carrier is between 0.1-1.5%, 0-1.5%, 0-0.25%, 0.5-5%, 0.5-15%, 0-10% and 0-15%; the upper end cover is provided with inner and outer two layers of clamping rings, which are respectively connected with the metal clamping block of the outer shell and the metal clamping block of the catalytic inner core; the filter cartridge and the catalytic inner core are prepared separately, and then the integrated catalytic filter material is obtained by combining them.

2. A composite metal filter material according to claim 1, characterized in that The preparation method of the filter cartridge is as follows: (1) Mix one or more of 201, 202, 304, 310s, 316, 321, 410, 420 and 430 stainless steel powders with a particle size of less than 300 meshes, one or more of aluminum sol, silica sol, low melting point glass powder, hydroxypropyl methylcellulose binder, and deionized water, and stir in a mixer at room temperature for 30 to 80 minutes to obtain a mixture; wherein the mass percentages of the stainless steel powder, the binder and the deionized water are: 60 to 75%, 10 to 20% and 5 to 20%; (2) placing the uniformly stirred mixture into a press and pressing the mixture into a metal felt plate with a thickness of 0.5 to 3 mm at a pressure of 20 to 50 tons; (3) placing the metal felt sheet into a horizontal plate rolling machine, bending the metal felt sheet into a cylindrical shape with a diameter of 150 to 600 mm at a rolling speed of 2 to 5 m / min, and connecting the edges of the felt sheet by welding to obtain a metal felt tube; (4) Place the metal felt tube into a kiln and calcine it at 800-1200°C for 0.5-2 h; (5) A metal sealing plate is welded at the bottom of the calcined metal felt tube to act as a seal, and a metal clamp is welded at the top to connect with the upper end cover.

3. A composite metal filter material according to claim 1, characterized in that The catalytic core preparation method is as follows: (1) Preparation of oxide carrier: one or more of Pt precursor, Pd precursor, Rh precursor, Ce precursor, Mo precursor, Zr precursor and Sn precursor are mixed with deionized water, and stirred at room temperature for 20-40 min to obtain a uniform solution; one of MnO2, Al2O3 and TiO2 powders with a particle size less than 200 mesh is added to the above solution, and stirred at 80-130°C until the water in the solution is completely evaporated to obtain a solid; the above solid is crushed into powder and placed in a muffle furnace, and calcined at 400-600°C for 3-6 h to obtain a prepared oxide carrier; (2) Prepare active component slurry: Add one or more of the oxide carrier, aluminum sol, silica sol and hydroxymethyl cellulose to deionized water and stir at room temperature for 20 to 50 min. Put the mixed solution into a ball mill and mill it at 300 to 700 r / min for 0.5 to 4 h; add one or more of the Pt precursor, Pd precursor and Rh precursor to the ball milled solution to obtain the prepared active component slurry; (3) Preparation of catalytic oxidation active inner core: immerse the metal mesh tube in the prepared active component solution for 5-30 s, place it in an oven and dry it at 90-120°C for 20-60 min, and after drying, place it in a muffle furnace and calcine it at 400-600°C for 3-6 h; weld a metal block on the top of the calcined metal mesh tube for connection with the upper end cover.

4. A composite metal filter material according to claim 3, characterized in that The Pt precursor, Pd precursor, Rh precursor, Ce precursor, Mo precursor, Zr precursor and Sn precursor are water-soluble compounds, including platinum nitrate, palladium nitrate, rhodium nitrate, cerium nitrate, ammonium molybdate, zirconium acetate and tin acetate.

5. A composite metal filter material according to claim 1, characterized in that The filter cartridge has a wall thickness of 0.5 to 3 mm, a diameter of 150 to 600 mm, a height of 600 to 3000 mm, a porosity of 75 to 90%, and an average pore size on the filter material surface of 1 to 5 μm.

6. A composite metal filter material according to claim 1, characterized in that The metal mesh tube has a wall thickness of 0.2-3 mm, a diameter of 100-450 mm, a height of 400-2800 mm, and a mesh number of 150-600.

7. A composite metal filter material according to claim 1, characterized in that The preparation method of the integrated catalytic filter material is as follows: (1) Select the upper end cover of appropriate size according to the diameter of the catalytic core and the filter shell; (2) The catalytic inner core and the outer shell are respectively connected and fixed to the upper end cover through the top clamp block, and a polytetrafluoroethylene sealing ring is put on the connection between the upper end cover and the outer shell to obtain an integrated catalytic filter material.

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