Corrugated plate scr denitration catalyst substrate and preparation method and use method thereof

Abstract

The application discloses a corrugated plate SCR denitration catalyst substrate and a preparation method and use method thereof. The corrugated plate SCR denitration catalyst substrate is mainly composed of a glass fiber plate and a substrate coating slurry. The substrate coating slurry comprises the following component raw materials in a weight content: butyl titanate 20-55%, ethyl orthosilicate 10-40%, silica sol 5-25%, polyvinyl alcohol 1-10%, anhydrous ethanol 10-40% and deionized water 5-20%. The corrugated plate SCR denitration catalyst substrate has strong scouring resistance, and after coating of active substances, the active substances are not easy to fall off, the fastness of the catalyst active substances on the substrate can be improved, the service life of the catalyst is prolonged, and the stable operation of the device for a longer time is ensured.

Description

Technical Field

[0001] This invention belongs to the field of SCR denitrification catalyst technology, and relates to a corrugated plate SCR denitrification catalyst substrate and its preparation and application methods. Background Technology

[0002] Nitrogen oxides (NO) x NO is one of the major air pollutants, causing not only environmental problems such as smog, acid rain, and photochemical smog, but also adversely affecting human health. Currently, commonly used NO... x The denitrification technology is selective catalytic reduction (SCR), which boasts high denitrification efficiency and produces no secondary pollution. Its core component is the denitrification catalyst. Based on the catalyst processing and molding method, catalysts are mainly classified into honeycomb, corrugated plate, and plate types. Honeycomb catalysts are widely used in the market, while corrugated plate catalysts also hold a certain market share due to their lightweight, large specific surface area, and short production cycle.

[0003] Patent CN201810166192.1 discloses a substrate with the following mass percentages: SiO2 53%–56%, CaO 27%–30%, Al2O3 12%–15%, and MgO 1%–3%. This invention prepares a substrate suitable for corrugated plate catalysts by adjusting the corrugation forming control technology. Although this substrate meets the requirements for corrugated plate catalyst preparation, the active material still easily detaches during practical applications, and its erosion resistance needs further improvement.

[0004] Patent CN201110321163.6 uses stainless steel plates, stainless steel mesh, titanium plates, or titanium mesh as substrates, employing electroplating, coating, or pressing methods to attach the carrier and active components. First, the catalyst carrier (titanium dioxide) is attached to a pre-treated corrugated framework, and then the active components are attached on top. The catalyst substrate prepared by this process is lightweight, has a large specific surface area, is less prone to dust accumulation, and the adhesion strength of the active material to the substrate has significant room for improvement.

[0005] The catalyst preparation process described in patent CN201611002886.9 uses inorganic fiberboard as a substrate. An active sol prepared from vanadium pentoxide, molybdenum trioxide, tungsten trioxide, titanium dioxide, and other substances is uniformly sprayed onto the upper and lower surfaces of the inorganic fiberboard. The sol is then rolled into a corrugated shape to obtain the finished catalyst. Catalysts prepared using this substrate and process have advantages such as low cost, short preparation time, high activity, and high wear resistance. However, the inorganic fiberboard used is aluminosilicate fiberboard, quartz fiberboard, or boron fiberboard. Since the substrate is not treated or improved, the active material is prone to detachment, affecting the overall performance of the catalyst.

[0006] Corrugated plate catalysts are mainly coated catalysts, typically prepared by coating an active material onto a substrate and then drying and calcining it. Commercial corrugated plate catalyst substrates are primarily made of glass fiber. During use, due to the presence of particulate matter in the flue gas and the large volume of flue gas, the active material can easily detach from the substrate, leading to a decrease in the catalyst's denitrification performance and severely impacting the stable and compliant operation of the equipment.

[0007] Therefore, in order to improve the overall performance of corrugated plate denitrification catalysts, it is of great significance to develop substrates suitable for corrugated plate catalysts based on substrate structure, preparation process and active materials. Summary of the Invention

[0008] The purpose of this invention is to provide a corrugated plate SCR denitrification catalyst substrate and its preparation and application methods. The corrugated plate SCR denitrification catalyst substrate and its preparation method can improve the adhesion of the catalyst active material to the substrate coating and effectively ensure the normal service life of the catalyst.

[0009] To achieve the above objectives, the present invention provides a corrugated SCR denitrification catalyst substrate, which is mainly composed of a glass fiber board and a substrate coating slurry. The substrate coating slurry comprises the following components in the indicated weight percentages: 20%–55% tetrabutyl titanate, 10%–40% tetraethyl orthosilicate, 5%–25% silica sol, 1%–10% polyvinyl alcohol, 10%–40% anhydrous ethanol, and 5%–20% deionized water.

[0010] The corrugated plate SCR denitrification catalyst substrate of the present invention preferably comprises the following components in weight percentage: 25% to 50% tetrabutyl titanate, 15% to 30% tetraethyl orthosilicate, 10% to 20% silica sol, 3% to 7% polyvinyl alcohol, 10% to 30% anhydrous ethanol, and 10% to 15% deionized water.

[0011] This invention also provides a method for preparing a corrugated plate SCR denitrification catalyst substrate, the method comprising the following steps:

[0012] (1) According to the design of the corrugated plate catalyst, the glass fiber plate is punched;

[0013] (2) Prepare a pretreatment solution, including the following components by weight: 35% to 65% methanol, 20% to 40% silane, 5% to 30% acetic acid and 2% to 15% deionized water;

[0014] (3) The glass fiber board after the punching process in step (1) is immersed in the pretreatment solution prepared in step (2);

[0015] (4) Dry the glass fiber board impregnated in step (3) and corrugate it by pressing rollers;

[0016] (5) The glass fiber boards processed in steps (3) and (4) are bonded and assembled to obtain the glass fiber substrate precursor;

[0017] (6) Add tetrabutyl titanate to anhydrous ethanol;

[0018] (7) Add tetraethyl orthosilicate to the solution in step (6) to form a suspension;

[0019] (8) Add silica sol to the suspension from step (7) to form a mixed suspension;

[0020] (9) Add polyvinyl alcohol to the mixed suspension in step (8) to obtain a corrugated plate substrate coating slurry;

[0021] (10) The substrate coating slurry obtained in step (9) is coated onto the glass fiber substrate precursor in step (5) and dried to obtain the corrugated plate SCR denitrification catalyst substrate.

[0022] In the preferred embodiment of the preparation method of the corrugated plate SCR denitrification catalyst substrate of the present invention, in step (1), the thickness of the glass fiber plate is 0.4-1 mm, the diameter of the punched holes is 0.5-3 mm, and the spacing between the holes is 50-100 mm.

[0023] The method for preparing the corrugated plate SCR denitrification catalyst substrate of the present invention preferably includes, in step (2), the pretreatment liquid comprising the following components by weight: methanol 40% to 60%, silane 25% to 35%, acetic acid 10% to 25%, and deionized water 5% to 10%.

[0024] In the preferred embodiment of the preparation method of the corrugated plate SCR denitrification catalyst substrate of the present invention, in step (3), the impregnation temperature is 40-50°C and the impregnation time is 60-80 min.

[0025] In the preferred embodiment of the preparation method of the corrugated plate SCR denitrification catalyst substrate of the present invention, the corrugation forming temperature in step (4) is 250-300°C.

[0026] In the preparation method of the corrugated plate SCR denitrification catalyst substrate of the present invention, preferably, in step (7), the pH is adjusted to 2-4.

[0027] In the preferred embodiment of the method for preparing the corrugated plate SCR denitrification catalyst substrate of the present invention, in step (8), the silica sol is added to the suspension in step (7) while being stirred at a constant speed and heated to 70-80°C.

[0028] In the preferred embodiment of the method for preparing the corrugated plate SCR denitrification catalyst substrate of the present invention, in step (9), deionized water is added during the process of adding polyvinyl alcohol to the mixed suspension solution in step (8), the mixture is stirred at a uniform speed, and heated to 90-95°C.

[0029] In the preferred embodiment of the method for preparing the corrugated plate SCR denitrification catalyst substrate of the present invention, in step (10), the drying temperature is 50-60°C and the drying time is 30-60 min.

[0030] The present invention also provides a method for using a corrugated plate SCR denitrification catalyst substrate, the method comprising: coating an active substance onto the corrugated plate SCR denitrification catalyst substrate, and then drying and calcining it to obtain a corrugated plate denitrification catalyst.

[0031] The corrugated plate SCR denitrification catalyst substrate of the present invention has strong erosion resistance. After coating with active material, the active material is not easy to fall off, which can improve the firmness of the active material on the substrate, thereby extending the service life of the catalyst and ensuring the stable operation of the device for a longer period of time.

[0032] The corrugated SCR denitrification catalyst substrate provided by this invention uses a glass fiber board that has undergone perforation treatment before being coated with a substrate coating slurry. The pretreatment solution effectively removes impurities from the glass fiber board surface, improves its performance, and facilitates corrugation forming and adhesion of the substrate coating slurry. The substrate coating slurry, formulated with tetrabutyl titanate, tetraethyl orthosilicate, anhydrous ethanol, silica sol, and polyvinyl alcohol, exhibits good adhesion and permeability, allowing for uniform dispersion on the glass fiber board surface. Under the influence of Ti-O-Ti, Si-O-Si, and Ti-O-Si bonds, the substrate coating slurry forms a unified whole, encapsulating the glass fiber board surface. Especially after the glass fiber board undergoes perforation treatment, the slurry on the front and back sides is interlocked through the mesh holes. This significantly improves the bonding force between the substrate coating slurry and the glass fiber board under the influence of chemical bonds, enhancing the firmness of the substrate coating slurry on the glass fiber board, ensuring the overall stability of the coating, and thus strengthening its erosion resistance. In addition, during the later stages of catalyst preparation, the substrate coating slurry is dried and calcined to form titanium dioxide, which serves as an important carrier for active substances and also facilitates the coating of active substances onto the substrate surface. Detailed Implementation

[0033] The technical solution of the present invention will now be described in detail with reference to embodiments thereof. Obviously, the described embodiments are only a part of the implementation of the present invention, and not all of them.

[0034] Test conditions: airspeed 6000 h -1 The reaction temperature was 350℃, and the particulate matter concentration was 500–600 mg / Nm³.3 N2 is the equilibrium gas, NO x 350~450mg / Nm 3 , O2 1.5~2.0%, H2O 5~10%.

[0035] The shedding rate is calculated as follows: (total catalyst mass - catalyst mass after shedding test) / coating mass × 100%.

[0036] The catalyst prepared from untreated glass fiber boards had an active material shedding rate of 21.5%.

[0037] Example 1:

[0038] A 0.5mm thick fiberglass board is punched with a hole diameter of 1mm and a hole spacing of 50mm. A pretreatment solution is prepared, comprising the following components by weight: methanol 45%, silane 30%, acetic acid 15%, and deionized water 10%. The punched fiberglass board is immersed in the pretreatment solution at a temperature of 45℃ for 60 minutes. After the fiberglass board is dried, it is corrugated using a pressure roller at a temperature of 280℃. The pretreated fiberglass board is then assembled with the corrugated fiberglass board formed by the pressure roller to obtain the fiberglass substrate precursor. 40g of tetrabutyl titanate was added to 35g of anhydrous ethanol and stirred evenly to obtain a solution. 25g of tetraethyl orthosilicate was then added to the solution and stirred at a constant speed to form a suspension. The pH was adjusted to 3. 15g of silica sol was then added to the suspension and stirred at a constant speed, and the mixture was heated to 70°C to obtain a mixed suspension. 5g of polyvinyl alcohol and 15g of deionized water were then added to the mixed suspension and stirred at a constant speed, and the mixture was heated to 90°C to obtain a corrugated plate substrate coating slurry. Finally, the substrate coating slurry was coated onto the assembled glass fiber substrate precursor and dried at 50°C for 30 minutes to obtain a corrugated plate SCR denitration catalyst substrate.

[0039] The prepared active material was coated onto a corrugated SCR denitrification catalyst substrate, then dried and calcined to obtain the corrugated plate denitrification catalyst. Calculations based on flue gas scouring showed that the active material shedding rate was 6.7%.

[0040] Comparative Example 1:

[0041] Take a 0.5 mm thick glass fiber board; prepare a pretreatment solution containing the following components by weight: 45% methanol, 30% silane, 15% acetic acid, and 10% deionized water; immerse the perforated glass fiber board in the pretreatment solution at a temperature of 45°C for 60 minutes; after the glass fiber board has dried, corrugate it using a pressure roller at a temperature of 280°C; then assemble the pretreated glass fiber board with the corrugated glass fiber board formed by the pressure roller to obtain the glass fiber substrate precursor. 40g of tetrabutyl titanate was added to 35g of anhydrous ethanol and stirred evenly to obtain a solution. 25g of tetraethyl orthosilicate was then added to the solution and stirred at a constant speed to form a suspension. The pH was adjusted to 3. 15g of silica sol was then added to the suspension and stirred at a constant speed, and the mixture was heated to 70°C to obtain a mixed suspension. 5g of polyvinyl alcohol and 15g of deionized water were then added to the mixed suspension and stirred at a constant speed, and the mixture was heated to 90°C to obtain a corrugated plate substrate coating slurry. Finally, the substrate coating slurry was coated onto the assembled glass fiber substrate precursor and dried at 50°C for 30 minutes to obtain a corrugated plate SCR denitration catalyst substrate.

[0042] The prepared active material was coated onto a corrugated SCR denitrification catalyst substrate, then dried and calcined to obtain the corrugated plate denitrification catalyst. Calculations based on flue gas scouring showed that the active material shedding rate was 15.8%.

[0043] Example 2:

[0044] A 0.7mm thick fiberglass board is punched with a hole diameter of 2mm and a hole spacing of 80mm. A pretreatment solution is prepared, comprising the following components by weight: 50% methanol, 35% silane, 10% acetic acid, and 5% deionized water. The punched fiberglass board is immersed in the pretreatment solution at 40℃ for 80 minutes. After the fiberglass board is dried, it is corrugated using a pressure roller at 300℃. The pretreated fiberglass board is then assembled with the corrugated fiberglass board formed by the pressure roller to obtain the fiberglass substrate precursor. 45g of tetrabutyl titanate was added to 35g of anhydrous ethanol and stirred evenly to obtain a solution. 35g of tetraethyl orthosilicate was then added to the solution and stirred at a constant speed to form a suspension. The pH was adjusted to 4. 25g of silica sol was then added to the suspension and stirred at a constant speed, and the mixture was heated to 80°C to obtain a mixed suspension. 6g of polyvinyl alcohol and 20g of deionized water were then added to the mixed suspension and stirred at a constant speed, and the mixture was heated to 95°C to obtain a corrugated plate substrate coating slurry. Finally, the substrate coating slurry was coated onto the assembled glass fiber substrate precursor and dried at 55°C for 50 minutes to obtain a corrugated plate SCR denitration catalyst substrate.

[0045] The prepared active material was coated onto a corrugated SCR denitrification catalyst substrate, then dried and calcined to obtain the corrugated plate denitrification catalyst. Calculations based on flue gas scouring showed that the active material shedding rate was 6.4%.

[0046] Comparative Example 2:

[0047] A 0.7mm thick fiberglass board is punched with a hole diameter of 2mm and a hole spacing of 80mm. A pretreatment solution is prepared, comprising the following components by weight: 50% methanol, 35% silane, 10% acetic acid, and 5% deionized water. The punched fiberglass board is immersed in the pretreatment solution at 40℃ for 80 minutes. After the fiberglass board is dried, it is corrugated using a pressure roller at 300℃. The pretreated fiberglass board is then assembled with the corrugated fiberglass board formed by the pressure roller to obtain the fiberglass substrate precursor. 45g of tetrabutyl titanate was added to 35g of anhydrous ethanol and stirred evenly to obtain a solution. 25g of silica sol was added to the solution, stirred at a constant speed, and heated to 80℃ to obtain a mixed suspension. 6g of polyvinyl alcohol and 20g of deionized water were added to the mixed suspension, stirred at a constant speed, and heated to 95℃ to obtain a corrugated plate substrate coating slurry. Finally, the substrate coating slurry was coated onto the assembled glass fiber substrate precursor and dried at 55℃ for 50 minutes to obtain a corrugated plate SCR denitration catalyst substrate.

[0048] The prepared active material was coated onto a corrugated SCR denitrification catalyst substrate, then dried and calcined to obtain the corrugated plate denitrification catalyst. Calculations based on flue gas scouring showed that the active material shedding rate was 11.4%.

[0049] Example 3:

[0050] A 0.8mm thick fiberglass board is punched with a hole diameter of 3mm and a hole spacing of 100mm. A pretreatment solution is prepared, comprising the following components by weight: 55% methanol, 30% silane, 10% acetic acid, and 5% deionized water. The punched fiberglass board is immersed in the pretreatment solution at 50℃ for 70 minutes. After the fiberglass board is dried, it is corrugated using a pressure roller at 280℃. The pretreated fiberglass board is then assembled with the corrugated fiberglass board formed by the pressure roller to obtain the fiberglass substrate precursor. 50g of tetrabutyl titanate was added to 45g of anhydrous ethanol and stirred evenly to obtain a solution. 35g of tetraethyl orthosilicate was then added to the solution and stirred at a constant speed to form a suspension. The pH was adjusted to 2. 35g of silica sol was then added to the suspension and stirred at a constant speed. The mixture was heated to 75°C to obtain a mixed suspension. 10g of polyvinyl alcohol and 20g of deionized water were then added to the mixed suspension and stirred at a constant speed. The mixture was heated to 90°C to obtain a corrugated plate substrate coating slurry. Finally, the substrate coating slurry was coated onto the assembled glass fiber substrate precursor and dried at 60°C for 60 minutes to obtain a corrugated plate SCR denitration catalyst substrate.

[0051] The prepared active material was coated onto a corrugated SCR denitrification catalyst substrate, then dried and calcined to obtain the corrugated plate denitrification catalyst. Calculations based on flue gas scouring showed that the active material shedding rate was 9.3%.

[0052] Comparative Example 3:

[0053] A 0.8mm thick fiberglass board was punched with 3mm holes spaced 100mm apart. The fiberglass board was then corrugated using a pressure roller at 280℃. The corrugated fiberglass board was then assembled with the pressure-rolled corrugated fiberglass board to obtain a fiberglass substrate precursor. 50g of tetrabutyl titanate was added to 45g of anhydrous ethanol and stirred uniformly to obtain a solution. 35g of tetraethyl orthosilicate was added to the solution and stirred uniformly to form a suspension, which was then adjusted to pH 2. 35g of silica sol was added to the suspension and stirred uniformly, then heated to 75℃ to obtain a mixed suspension. 10g of polyvinyl alcohol and 20g of deionized water were added to the mixed suspension and stirred uniformly, then heated to 90℃ to obtain a corrugated substrate coating slurry. Finally, the substrate coating slurry was coated onto the assembled fiberglass substrate precursor and dried at 60℃ for 60 minutes to obtain a corrugated SCR denitration catalyst substrate.

[0054] The prepared active material was coated onto a corrugated SCR denitrification catalyst substrate, dried, and calcined to obtain the corrugated plate denitrification catalyst. Calculations based on flue gas scouring showed that the active material shedding rate was 16.7%.

[0055] Example 4:

[0056] A 1mm thick fiberglass board is punched with holes of 2mm diameter and 60mm spacing between holes. A pretreatment solution is prepared containing the following components by weight: 50% methanol, 25% silane, 18% acetic acid, and 7% deionized water. The punched fiberglass board is immersed in the pretreatment solution at 50℃ for 80 minutes. After the fiberglass board is dried, it is corrugated using a pressure roller at 300℃. The pretreated fiberglass board is then assembled with the corrugated fiberglass board formed by the pressure roller to obtain the fiberglass substrate precursor. 48g of tetrabutyl titanate was added to 50g of anhydrous ethanol and stirred evenly to obtain a solution. 32g of tetraethyl orthosilicate was then added to the solution and stirred at a constant speed to form a suspension. The pH was adjusted to 3. 27g of silica sol was then added to the suspension and stirred at a constant speed, and the mixture was heated to 80℃ to obtain a mixed suspension. 8g of polyvinyl alcohol and 27g of deionized water were then added to the mixed suspension and stirred at a constant speed, and the mixture was heated to 95℃ to obtain a corrugated plate substrate coating slurry. Finally, the substrate coating slurry was coated onto the assembled glass fiber substrate precursor and dried at 60℃ for 50 minutes to obtain a corrugated plate SCR denitration catalyst substrate.

[0057] The prepared active material was coated onto a corrugated SCR denitrification catalyst substrate, then dried and calcined to obtain the corrugated plate denitrification catalyst. Calculations based on flue gas scouring showed that the active material shedding rate was 6.5%.

[0058] Comparative Example 4:

[0059] A 1mm thick fiberglass board is punched with holes of 2mm diameter and 60mm spacing between holes. A pretreatment solution is prepared, comprising the following components by weight: 50% methanol, 25% silane, 18% acetic acid, and 7% deionized water. The punched fiberglass board is immersed in the pretreatment solution at 50℃ for 80 minutes. After the fiberglass board is dried, it is corrugated using a pressure roller at 300℃. The pretreated fiberglass board is then assembled with the corrugated fiberglass board formed by the pressure roller to obtain the fiberglass substrate precursor. 32g of tetraethyl orthosilicate was added to 50g of anhydrous ethanol and stirred at a constant speed to obtain a solution. The pH was adjusted to 3. 27g of silica sol was added to the solution, and the mixture was stirred at a constant speed and heated to 80℃ to obtain a suspension. 8g of polyvinyl alcohol and 27g of deionized water were added to the suspension, and the mixture was stirred at a constant speed and heated to 95℃ to obtain a corrugated plate substrate coating slurry. Finally, the substrate coating slurry was coated onto the assembled glass fiber substrate precursor and dried at 60℃ for 50 minutes to obtain a corrugated plate SCR denitration catalyst substrate.

[0060] The prepared active material was coated onto a corrugated SCR denitrification catalyst substrate, then dried and calcined to obtain the corrugated plate denitrification catalyst. Calculations based on flue gas scouring showed that the active material shedding rate was 16.3%.

[0061] The results from the examples and comparative examples show that the punching process of the glass fiber board, the pretreatment liquid, and the substrate coating slurry all cause changes in the shedding of active substances from the substrate to varying degrees, collectively contributing to the alteration of erosion resistance. Compared to the comparative examples, the corrugated plate catalyst obtained using the component raw materials and preparation process described in the examples exhibits superior erosion resistance.

[0062] In summary, the glass fiber substrate prepared by coating the glass fiber board and the substrate with slurry can solve the problem of easy shedding of active material from the corrugated plate catalyst, improve the catalyst's erosion resistance, and extend the catalyst's service life.

[0063] This invention is not limited to the specific embodiments described above. Any changes or modifications made by those skilled in the art within the scope of this invention are covered by the patent scope of this invention.

Claims

1. A corrugated plate SCR denitrification catalyst substrate, characterized in that, It is mainly composed of glass fiber board and substrate coating slurry. The substrate coating slurry includes the following components by weight: 20%~55% tetrabutyl titanate, 10%~40% tetraethyl orthosilicate, 5%~25% silica sol, 1%~10% polyvinyl alcohol, 10%~40% anhydrous ethanol, and 5%~20% deionized water. The preparation method of the corrugated plate SCR denitrification catalyst substrate includes the following steps: (1) According to the design of the corrugated plate catalyst, the glass fiber plate is perforated; (2) Prepare the pretreatment solution, which includes the following components by weight: methanol 35%~65%, silane 20%~40%, acetic acid 5%~30%, and deionized water 2%~15%; (3) The glass fiber board after the punching process in step (1) is placed in the pretreatment solution prepared in step (2) for immersion; (4) Dry the glass fiber board impregnated in step (3) and corrugate it by pressing the roller; (5) The glass fiber boards processed in steps (3) and (4) are bonded and assembled to obtain the glass fiber substrate precursor; (6) Add tetrabutyl titanate to anhydrous ethanol; (7) Add tetraethyl orthosilicate to the solution in step (6) to form a suspension; (8) Add silica sol to the suspension in step (7) to form a mixed suspension; (9) Add polyvinyl alcohol to the mixed suspension in step (8) to obtain a corrugated plate substrate coating slurry; (10) The substrate coating slurry obtained in step (9) is coated onto the glass fiber substrate precursor in step (5) and dried to obtain the corrugated plate SCR denitrification catalyst substrate.

2. The corrugated plate SCR denitrification catalyst substrate according to claim 1, characterized in that, The substrate coating slurry comprises the following components by weight: 25%~50% tetrabutyl titanate, 15%~30% tetraethyl orthosilicate, 10%~20% silica sol, 3%~7% polyvinyl alcohol, 10%~30% anhydrous ethanol, and 10%~15% deionized water.

3. The corrugated plate SCR denitrification catalyst substrate according to claim 1, characterized in that, In step (1), the thickness of the fiberglass board is 0.4~1mm, the diameter of the punched holes is 0.5~3mm, and the spacing between the holes is 50~100mm.

4. The corrugated plate SCR denitrification catalyst substrate according to claim 1, characterized in that, In step (2), the pretreatment liquid includes the following components by weight: methanol 40%~60%, silane 25%~35%, acetic acid 10%~25%, and deionized water 5%~10%.

5. The corrugated plate SCR denitrification catalyst substrate according to claim 1, characterized in that, In step (3), the immersion temperature is 40~50℃ and the immersion time is 60~80min.

6. The corrugated plate SCR denitrification catalyst substrate according to claim 1, characterized in that, In step (4), the temperature for corrugation forming is 250~300℃.

7. The corrugated plate SCR denitrification catalyst substrate according to claim 1, characterized in that, In step (7), adjust the pH to 2-4.

8. The corrugated plate SCR denitrification catalyst substrate according to claim 1, characterized in that, In step (8), the silica sol is added to the suspension in step (7) while stirring at a constant speed and heating to 70~80℃.

9. The corrugated plate SCR denitrification catalyst substrate according to claim 1, characterized in that, In step (9), during the process of adding polyvinyl alcohol to the mixed suspension solution in step (8), deionized water is added, the mixture is stirred at a constant speed, and heated to 90~95℃.

10. The corrugated plate SCR denitrification catalyst substrate according to claim 1, characterized in that, In step (10), the drying temperature is 50~60℃ and the drying time is 30~60min.

11. A method for preparing a corrugated plate SCR denitrification catalyst substrate according to any one of claims 1-10, characterized in that, Includes the following steps: (1) According to the design of the corrugated plate catalyst, the glass fiber plate is perforated; (2) Prepare the pretreatment solution, which includes the following components by weight: methanol 35%~65%, silane 20%~40%, acetic acid 5%~30%, and deionized water 2%~15%; (3) The glass fiber board after the punching process in step (1) is placed in the pretreatment solution prepared in step (2) for immersion; (4) Dry the glass fiber board impregnated in step (3) and corrugate it by pressing the roller; (5) The glass fiber boards processed in steps (3) and (4) are bonded and assembled to obtain the glass fiber substrate precursor; (6) Add tetrabutyl titanate to anhydrous ethanol; (7) Add tetraethyl orthosilicate to the solution in step (6) to form a suspension; (8) Add silica sol to the suspension in step (7) to form a mixed suspension; (9) Add polyvinyl alcohol to the mixed suspension in step (8) to obtain a corrugated plate substrate coating slurry; (10) The substrate coating slurry obtained in step (9) is coated onto the glass fiber substrate precursor in step (5) and dried to obtain the corrugated plate SCR denitrification catalyst substrate.

12. The preparation method according to claim 11, characterized in that, In step (1), the thickness of the fiberglass board is 0.4~1mm, the diameter of the punched holes is 0.5~3mm, and the spacing between the holes is 50~100mm.

13. The preparation method according to claim 11, characterized in that, In step (2), the pretreatment liquid includes the following components by weight: methanol 40%~60%, silane 25%~35%, acetic acid 10%~25%, and deionized water 5%~10%.

14. The preparation method according to claim 11, characterized in that, In step (3), the immersion temperature is 40~50℃ and the immersion time is 60~80min.

15. The preparation method according to claim 11, characterized in that, In step (4), the temperature for corrugation forming is 250~300℃.

16. The preparation method according to claim 11, characterized in that, In step (7), adjust the pH to 2-4.

17. The preparation method according to claim 11, characterized in that, In step (8), the silica sol is added to the suspension in step (7) while stirring at a constant speed and heating to 70~80℃.

18. The preparation method according to claim 11, characterized in that, In step (9), during the process of adding polyvinyl alcohol to the mixed suspension solution in step (8), deionized water is added, the mixture is stirred at a constant speed, and heated to 90~95℃.

19. The preparation method according to claim 11, characterized in that, In step (10), the drying temperature is 50~60℃ and the drying time is 30~60min.

20. A method of using the corrugated plate SCR denitrification catalyst substrate according to any one of claims 1-10, characterized in that, include: The corrugated plate SCR denitrification catalyst substrate is coated with active material, and then dried and calcined to obtain the corrugated plate denitrification catalyst.