Preparation method and application of catalyst for treating industrial organic waste gas
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WANHUA CHEM GRP CO LTD
- Filing Date
- 2024-11-21
- Publication Date
- 2026-05-22
AI Technical Summary
Existing industrial organic waste gas treatment methods are costly, have low removal efficiency for some organic compounds, and are poorly adaptable to unstable waste gases.
The catalyst was prepared by using elements such as Fe, Co, Ni, Cu, Mn, Ce, Nb, Eu, and Ho as active and auxiliary components, combined with Na+ and K+ as regulators, through impregnation, stamping, drying, and calcination processes, thereby optimizing the pore structure and surface active metal distribution of the catalyst.
It achieves complete removal of organic components from industrial organic waste gas, reduces catalyst costs, improves treatment efficiency, and can maintain high-efficiency operation for a long time.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of waste gas treatment, and in particular to a method for preparing a catalyst for removing organic matter from waste gas and its application. Background Technology
[0002] In chemical production processes, waste gases containing organic components are generated due to processes such as the volatilization of organic components, exhaust gas replacement from reaction vessels, and tank breathing. These waste gases are typically treated using combustion or catalytic combustion methods. However, conventional RTO (Regenerative Thermal Oxidizer) treatment requires stable waste gas composition, concentration, and flow rate; frequent fluctuations can cause RTO unit shutdowns. If conventional CO (Copper Oxide) furnaces are used, they are less effective at treating short-chain alkanes, and CO furnaces require precious metal catalysts, resulting in high overall operating costs.
[0003] Therefore, for industrial organic waste gas, it is necessary to develop a treatment measure or catalyst suitable for unstable waste gas to render the waste gas harmless. Summary of the Invention
[0004] To address the problems of high cost and low removal efficiency of some organic compounds in existing industrial organic waste gas treatment methods, the present invention aims to provide a novel, highly efficient catalyst for treating industrial organic waste gas. This catalyst can achieve complete removal of organic components from waste gas, reduce the problem of excessive organic matter in the exhaust gas of waste gas treatment facilities, and maintain high-efficiency operation for extended periods.
[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions.
[0006] On one hand, the present invention provides a method for preparing a catalyst for treating industrial organic waste gas, the preparation method comprising the following steps:
[0007] (1) Dissolve the active component of the catalyst, the catalyst auxiliary component and the catalyst site regulator in a dispersant to obtain an impregnation solution;
[0008] (2) The impregnation liquid obtained in step (1) is thoroughly mixed with the carrier powder and the adhesive to form a slurry.
[0009] (3) The obtained slurry is uniformly filled into a mold and stamped or extruded into strips to obtain the precursor.
[0010] (4) The precursor obtained in step (3) is dried to remove free water, water of crystallization and volatile substances inside the catalyst;
[0011] (5) The product obtained in step (4) is impregnated and activated in the catalyst activation solution;
[0012] (6) The product obtained in step (5) is subjected to calcination.
[0013] In this invention, the catalyst active component in step (1) is selected from one or more of the nitrates, sulfates or chlorides of Fe, Co, Ni, Cu and Mn;
[0014] The catalyst promoter component is selected from one or more of the nitrates, sulfates or chlorides of Ce, Nb, Eu, and Ho;
[0015] The catalyst site modifier is selected from one or more of the following: nitrates, sulfates, chlorides, or hydroxides of K, Na, and Mg;
[0016] The dispersant can be selected from pure water, 2-5% ethanol solution, or 1-5% ammonia solution;
[0017] After being dissolved in the dispersant, the concentration of metal ions in the active component of the catalyst is 10–350 g / L, preferably 30–300 g / L, more preferably 100–200 g / L, the concentration of metal ions in the catalyst promoter component is 1–150 g / L, preferably 40–70 g / L, and the concentration of metal ions in the catalyst site modifier is 1–10 g / L.
[0018] In this invention, the pH of the impregnation solution in step (1) is controlled between 2 and 9, preferably between 3 and 5; the pH can be adjusted by one or more of ammonia, sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, hydrochloric acid, sulfuric acid, and nitric acid.
[0019] In this invention, in step (1), metal ions can be evenly dispersed in the impregnation solution by means of mechanical vibration, stirring, ultrasound, etc.
[0020] In this invention, the dispersion equipment used in the dispersion process of step (1) includes an ultrasonic cleaner, a mechanical shaker, a magnetic stirrer, a mechanical stirrer, etc., and the temperature control uses a constant temperature water bath, a circulating water bath, an electric heater, etc.
[0021] In this invention, in step (2), the carrier powder is selected from at least one of titanium dioxide, alumina, cerium oxide, boehmite, and molecular sieves (e.g., ZSM-5 molecular sieve, NaY molecular sieve, HZSM-5 molecular sieve, etc.).
[0022] When the impregnation solution is mixed with the carrier powder, the temperature is 40–80°C;
[0023] Preferably, the amount of carrier powder used per kilogram of finished catalyst is 300-800g, and more preferably 500-700g.
[0024] The binder is selected from at least one of sodium tungstate, tungsten oxide, potassium chloride, and potassium nitrate, and the amount added is 5-15% of the mass of the carrier powder, preferably 8-12%.
[0025] In this invention, the stamping pressure in step (3) is 1–500 MPa. Honeycomb-shaped structured catalysts, cylindrical strip catalysts, clover-shaped strip catalysts, spherical catalysts, etc., can be prepared according to different application scenarios.
[0026] In this invention, the heating rate in step (4) is 1-20℃ / min; the drying temperature is 100-500℃; the drying time is 1-10h; and the drying process is carried out in an atmosphere of N2, air, Ar or He.
[0027] In this invention, in step (5), the main components of the catalyst activation liquid are compounds containing one or more of the elements Fe, Ni, Cu, Zn, Mn, Ce, Nb, Co, etc., and ion regulators containing one or two of the elements Na and K, respectively derived from the corresponding metal nitrates, sulfates or chlorides.
[0028] The concentration of the main component metal ions in the catalyst activation solution is 50–300 g / L, preferably 80–250 g / L, and the concentration of the metal ions in the ion regulator is 0.1–10 g / L.
[0029] The pH of the activation solution is controlled between 2 and 9. The pH is adjusted by one or more of the following: ammonia, sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, hydrochloric acid, sulfuric acid, and nitric acid.
[0030] In this invention, the activation temperature in step (5) is 20-60°C and the activation time is 10-120 min.
[0031] In this invention, the calcination temperature in step (6) is 300-800℃, the heating rate is 1-20℃ / min, and the calcination time is 1-10h.
[0032] In this invention, the calcination process in step (6) must be carried out in an atmosphere of NH3, N2, air, Ar or He.
[0033] In a second aspect, the present invention provides the application of the catalyst in the treatment of organic waste gas.
[0034] In some specific embodiments, the organic waste gas may be reactor exhaust gas from the petrochemical industry, breathing exhaust gas from raw material storage tanks, negative pressure exhaust gas from industrial plants, etc., and may contain propane, butane, acrylic acid, toluene, methanol, butyl acetate, n-heptane, etc., with the content of a single component organic matter being 5000 mg / Nm³. 3Within 10000 mg / Nm³, the total organic matter content is within 10000 mg / Nm³. 3 Within.
[0035] The main advantages of this invention are:
[0036] Using one or more different combinations of Fe, Co, Ni, Cu, Mn, Ce, Nb, Eu, and Ho as the active component and promoter component of the catalyst, and passing it through an alkali metal Na... + K + As a regulator to adjust the acidic sites of the support, it effectively reduces the catalyst cost compared to noble metal catalysts; by using one or more different combinations of Fe, Co, Ni, Cu, Mn, Mg, Na, K, Ce, Nb, Eu, Ho ions to prepare impregnation solutions, and then preparing catalysts through conventional impregnation, stamping, drying, and calcination methods, the catalyst processing cycle is effectively reduced and the catalyst yield is increased; by using one or more combinations of Fe, Ni, Co, Cu, Zn, Mn, Ce, Nb to prepare catalyst activation solutions, the distribution of active metals on the catalyst surface is effectively controlled, and by using Na-containing... + K + and NH4 + Ionic substances regulate pH, which effectively improves the catalyst pore structure and increases the catalyst nitrogen content during the calcination process, thereby effectively enhancing the catalyst activity and meeting the requirements of CO, RCO and other waste gas treatment facilities. Detailed Implementation
[0037] The present invention will be further described below with reference to the embodiments, which include, but are not limited to, the following embodiments.
[0038] Raw materials and sources: The raw materials used in the following examples are all AR-grade chemical reagents purchased from reagent manufacturers such as Aladdin and Innocare.
[0039] Test methods: Catalyst activity was evaluated using a fixed-bed apparatus, and the organic matter content was collected by solvent absorption and then tested by gas chromatography-mass spectrometry.
[0040] Example 1
[0041] (1) First, fill the container with manganese nitrate solution, and add nickel nitrate hexahydrate, cerium nitrate, and potassium nitrate to it;
[0042] (2) Add pure water to the container to prepare the Mn ion content of 150 g / L, Ni content of 80 g / L, Ce ion content of 50 g / L and K ion content of 5 g / L. Then add ammonia water to adjust the pH to 5, and place the container on a heating stirrer to raise the temperature to 60°C and stir continuously at a stirring speed of 300 r / min for 40 min to complete the preparation of the impregnation solution.
[0043] (3) Weigh 100g of ZSM-5 molecular sieve powder and 50g of impregnation liquid. The mass ratio of carrier to impregnation liquid is 2:1. Slowly add the molecular sieve powder to the impregnation liquid and stir continuously. Maintain a stirring speed of 300r / min for 1h and keep heating at 60℃ during the process.
[0044] (4) After the suspension is stirred into a slurry, sodium tungstate binder is added to the suspension. The mass ratio of binder to carrier is 1:10. The mixed slurry is placed in an extruder for extrusion, with an extrusion length of 5-8 mm.
[0045] (5) Dry the catalyst in air atmosphere at a drying temperature of 500℃ for 1 hour.
[0046] (6) Fill the container with potassium nitrate, add manganese nitrate and nickel nitrate, and add pure water to prepare a solution with K ion content of 5 g / L, Mn ion content of 80 g / L and Ni ion content of 40 g / L. Then add sodium carbonate to adjust the pH to 5, place the container on a heating stirrer to raise the temperature to 60°C, and stir continuously at a stirring speed of 300 r / min for 40 min to complete the preparation of the activation solution.
[0047] (7) Immerse the dried catalyst in 100 mL of activation solution, keep the temperature at 60 °C, activate the catalyst, take out the catalyst after activating for 10 min, and calcine the catalyst in air atmosphere at 600 °C, heating rate of 2 °C / min, continue calcining for 5 h, and then cool naturally to room temperature to complete the catalyst preparation.
[0048] (8) Cut the catalyst and fill it into the reactor. Configure the inlet gas propane content to 1000 mg / m³. 3 Toluene 200 mg / Nm 3 Methanol 2000mg / Nm 3 (equivalent to 5000 mg / Nm³ of non-methane total hydrocarbons) 3 ) airspeed 10000h -1 The reaction temperature was 350℃. The removal rate of organic matter by the catalyst was calculated by comparing the content of characteristic pollutants (toluene, propane, methanol) and non-methane total hydrocarbons at the reactor inlet and outlet.
[0049] The long-term organic matter removal efficiency of the catalyst was verified, and the results are shown in Table 1. The characteristic pollutant treatment efficiency of the catalyst was verified, and the results are shown in Table 2.
[0050] Example 2
[0051] (1) First, fill the container with ferrous chloride solution, and add cobalt chloride, niobium chloride, and potassium chloride to it;
[0052] (2) Add pure water to the container to prepare Fe ion content of 300g / L, Co content of 15g / L, Nb ion content of 120g / L and K ion content of 5g / L. Then add sodium hydroxide to adjust the pH to 9, and place the container in an ultrasonic disperser to heat to 60℃ and continue ultrasonic dispersion for 40min to complete the preparation of the impregnation solution.
[0053] (3) Weigh 100g of alumina powder and 50g of impregnation liquid. The mass ratio of carrier to impregnation liquid is 2:1. Slowly add the alumina powder to the impregnation liquid and stir continuously. Maintain a stirring speed of 300r / min for 10min and keep heating at 80℃ during the process.
[0054] (4) After the suspension is stirred into a slurry, potassium chloride binder is added to the suspension. The mass ratio of binder to carrier is 1:10. The mixed slurry is placed in an extruder for extrusion, with an extrusion length of 5-8 mm.
[0055] (5) Dry the catalyst in air atmosphere at 100°C for 10 hours.
[0056] (6) Fill the container with sodium chloride, add ferrous chloride and cobalt chloride, and add pure water to prepare a Na ion content of 10 g / L, a Fe ion content of 1 g / L, and a Co ion content of 200 g / L. Then add potassium hydroxide to adjust the pH to 9, and place the container on a heating stirrer to raise the temperature to 60°C and stir continuously at a stirring speed of 300 r / min for 40 min to complete the preparation of the activation solution.
[0057] (7) Immerse the dried catalyst in 100 mL of activation solution, keep the temperature at 40 °C, activate the catalyst, take out the catalyst after 60 min of activation, and calcine the catalyst in N2 atmosphere at 800 °C, heating rate at 20 °C / min, continue calcining for 1 h, and cool naturally to room temperature to complete the catalyst preparation.
[0058] (8) The catalyst was cut and loaded into the reactor. The long-term organic matter removal effect of the catalyst was verified according to the same method and conditions as in Example 1. The data results are shown in Table 1. The effect of the catalyst on the treatment of characteristic pollutants was verified. The data results are shown in Table 2.
[0059] Example 3
[0060] (1) First, fill the container with ferric sulfate solution, and then add copper sulfate, holmium nitrate, and sodium sulfate to it;
[0061] (2) Add pure water to the container to prepare Fe ion content of 15g / L, Cu content of 15g / L, Ho ion content of 1g / L and Na ion content of 5g / L. Then add hydrochloric acid to adjust the pH to 2, and place the container in a mechanical shaker and continue to disperse for 40 minutes to complete the preparation of the impregnation solution.
[0062] (3) Weigh 100g of boehmite powder and 50g of impregnation liquid. The mass ratio of carrier to impregnation liquid is 2:1. Slowly add boehmite powder to impregnation liquid and stir continuously. Stir at 300r / min for 120min and keep heating at 40℃ during the process.
[0063] (4) After the suspension is stirred into a slurry, potassium nitrate binder is added to the suspension. The mass ratio of binder to carrier is 1:10. The mixed slurry is placed in an extruder for extrusion, with an extrusion length of 5-8 mm.
[0064] (5) Dry the catalyst in air at a temperature of 200°C for 3 hours.
[0065] (6) Fill the container with potassium sulfate, add ferric sulfate and copper sulfate, and add pure water to prepare a K ion content of 0.1 g / L, an Fe ion content of 200 g / L, and a Cu ion content of 100 g / L. Then add sulfuric acid to adjust the pH to 2, and place the container on a heating stirrer to raise the temperature to 60°C and stir continuously at a stirring speed of 300 r / min for 40 min to complete the preparation of the activation solution.
[0066] (7) Immerse the dried catalyst in 100 mL of activation solution, keep the temperature at 20 °C, activate the catalyst, take out the catalyst after activating for 120 min, and calcine the catalyst in NH3 atmosphere at 300 °C, heating rate 1 °C / min, continue calcining for 10 h, and then cool naturally to room temperature to complete the catalyst preparation.
[0067] (8) The catalyst was cut and loaded into the reactor. The long-term organic matter removal effect of the catalyst was verified according to the same method and conditions as in Example 1, and the data results are shown in Table 1. The effect of the catalyst on the treatment of characteristic pollutants was verified, and the data results are shown in Table 2.
[0068] Example 4
[0069] (1) First, fill the container with manganese nitrate solution, and then add copper nitrate, europium nitrate, and potassium nitrate to it;
[0070] (2) Add pure water to the container to prepare Mn ion content of 180 g / L, Cu content of 100 g / L, Eu ion content of 1 g / L and K ion content of 5 g / L. Then add sodium bicarbonate to adjust the pH to 6, and place the container on a heating stirrer to raise the temperature to 60°C. Stir continuously at a stirring speed of 300 r / min for 40 min to complete the preparation of the impregnation solution.
[0071] (3) Weigh 100g of titanium oxide powder and 50g of impregnation liquid. The mass ratio of carrier to impregnation liquid is 2:1. Slowly add titanium oxide powder to impregnation liquid and stir continuously. Maintain stirring speed of 300r / min for 1h, and keep heating at 60℃ during the process.
[0072] (4) After the suspension is stirred into a slurry, add 2g of tungsten oxide binder to the suspension. The mass ratio of binder to carrier is 1:10. Place the catalyst in the stamping die and stamp it at a pressure of 20MPa.
[0073] (5) The stamped catalyst is dried in air at a temperature of 200°C for 3 hours.
[0074] (6) Fill the container with potassium nitrate, add manganese nitrate and copper nitrate, and add pure water to prepare a K ion content of 0.1 g / L, a Mn ion content of 60 g / L, and a Cu ion content of 30 g / L. Then add sodium bicarbonate to adjust the pH to 6, and place the container on a heating stirrer to raise the temperature to 60°C and stir continuously at a stirring speed of 300 r / min for 40 min to complete the preparation of the activation solution.
[0075] (7) Immerse the dried catalyst in 100 mL of activation solution, keep the temperature at 60 °C, activate the catalyst, take out the catalyst after 30 min of activation, and calcine the catalyst in Ar atmosphere at 500 °C, heating rate at 5 °C / min, continue calcining for 2 h, and then cool naturally to room temperature to complete the catalyst preparation.
[0076] (8) The catalyst was cut and loaded into the reactor. The long-term organic matter removal effect of the catalyst was verified according to the same method and conditions as in Example 1. The data results are shown in Table 1. The effect of the catalyst on the treatment of characteristic pollutants was verified. The data results are shown in Table 2.
[0077] Example 5
[0078] (1) First, fill the container with manganese nitrate solution, and add nickel nitrate, cerium nitrate, and potassium nitrate to it;
[0079] (2) Add pure water to the container to prepare Mn ion content of 150g / L, Ni content of 80g / L, Ce ion content of 50g / L and K ion content of 5g / L. Then add nitric acid to adjust the pH to 2, and place the container on a heating stirrer to raise the temperature to 60°C. Stir continuously at a stirring speed of 300r / min for 40min to complete the preparation of the impregnation solution.
[0080] (3) Weigh 100g of cerium oxide powder and 50g of impregnation liquid. The mass ratio of carrier to impregnation liquid is 2:1. Slowly add cerium oxide powder to the impregnation liquid and stir continuously. Maintain a stirring speed of 300r / min for 2h and keep heating at 80℃ during the process.
[0081] (4) After the suspension is stirred into a slurry, sodium tungstate binder is added to the suspension. The mass ratio of binder to carrier is 1:10. The catalyst is then stamped in a stamping die at a pressure of 1 MPa.
[0082] (5) The stamped catalyst is dried in air at a temperature of 200°C for 3 hours.
[0083] (6) Fill the container with potassium nitrate, add manganese nitrate and copper nitrate, and add pure water to prepare a K ion content of 5 g / L, a Mn ion content of 80 g / L, and a copper ion content of 40 g / L. Then add nitric acid to adjust the pH to 2, and place the container on a heating stirrer to raise the temperature to 60°C and stir continuously at a stirring speed of 300 r / min for 40 min to complete the preparation of the activation solution.
[0084] (7) Immerse the dried catalyst in 100 mL of activation solution and keep the temperature at 50 °C to activate the catalyst. After activation for 20 min, take out the catalyst and calcine it in He atmosphere at 450 °C with a heating rate of 10 °C / min for 3 h. After natural cooling to room temperature, the catalyst preparation is complete.
[0085] (8) The catalyst was cut and loaded into the reactor. The long-term organic matter removal effect of the catalyst was verified according to the same method and conditions as in Example 1. The data results are shown in Table 1. The effect of the catalyst on the treatment of characteristic pollutants was verified. The data results are shown in Table 2.
[0086] Example 6
[0087] (1) First, fill the container with manganese nitrate solution, and add nickel nitrate, cerium nitrate, and potassium nitrate to it;
[0088] (2) Add pure water to the container to prepare Mn ion content of 150g / L, Ni content of 80g / L, Ce ion content of 50g / L and K ion content of 5g / L. Then add ammonia water to adjust the pH to 5, and place the container on a heating stirrer to raise the temperature to 60℃. Stir continuously at a stirring speed of 300r / min for 40min to complete the preparation of the impregnation solution.
[0089] (3) Weigh 100g of HZSM-5 molecular sieve powder and 50g of impregnation liquid. The mass ratio of carrier to impregnation liquid is 2:1. Slowly add the molecular sieve powder to the impregnation liquid and stir continuously. Maintain a stirring speed of 300r / min for 1h and keep heating at 60℃ during the process.
[0090] (4) After the suspension is stirred into a slurry, sodium tungstate binder is added to the suspension. The mass ratio of binder to carrier is 1:10. The catalyst is placed in the stamping die and stamped at a pressure of 500 MPa.
[0091] (5) The stamped catalyst is dried in air at a temperature of 200°C for 3 hours.
[0092] (6) Fill the container with potassium nitrate, add manganese nitrate and nickel nitrate, and add pure water to prepare a K ion content of 5 g / L, a Mn ion content of 80 g / L and a Ni ion content of 40 g / L. Then add ammonia water to adjust the pH to 5, and place the container on a heating stirrer to raise the temperature to 60°C and stir continuously at a stirring speed of 300 r / min for 40 min to complete the preparation of the activation solution.
[0093] (7) Immerse the dried catalyst in 100 mL of activation solution, keep the temperature at 50 °C, activate the catalyst, take out the catalyst after activating for 20 min, and calcine the catalyst in air atmosphere at 450 °C, heating rate of 10 °C / min, continue calcining for 3 h, and then cool naturally to room temperature to complete the catalyst preparation.
[0094] (8) The catalyst was cut and loaded into the reactor. The long-term organic matter removal effect of the catalyst was verified according to the same method and conditions as in Example 1. The data results are shown in Table 1. The effect of the catalyst on the treatment of characteristic pollutants was verified. The data results are shown in Table 2.
[0095] Comparative Example 1
[0096] Except for omitting the addition of cerium nitrate to the impregnation solution in Example 1, the other operations and parameters are the same as in Example 1. The long-term organic matter removal effect of the catalyst was verified, and the data results are shown in Table 3. The characteristic pollutant treatment effect of the catalyst was verified, and the data results are shown in Table 4.
[0097] Comparative Example 2
[0098] Except for omitting the addition of potassium nitrate in the activation solution in Example 1, the other operations and parameters are the same as in Example 1. The long-term organic matter removal effect of the catalyst was verified, and the data results are shown in Table 3. The characteristic pollutant treatment effect of the catalyst was verified, and the data results are shown in Table 4.
[0099] Comparative Example 3
[0100] Except for steps (2) and (6) in Example 1, where the pH was adjusted to 10, all other operations and parameters were the same as in Example 1. The long-term organic matter removal effect of the catalyst was verified, and the data results are shown in Table 3. The characteristic pollutant treatment effect of the catalyst was verified, and the data results are shown in Table 4.
[0101] Comparative Example 4
[0102] Except that manganese nitrate used in steps (1) and (6) of Example 1 was replaced with magnesium nitrate, and nickel nitrate was replaced with zinc nitrate, all other operations and parameters were the same as in Example 1. The long-term organic matter removal effect of the catalyst was verified, and the data results are shown in Table 3. The characteristic pollutant treatment effect of the catalyst was verified, and the data results are shown in Table 4.
[0103] Table 1. Long-term treatment effect of catalysts in Examples 1-6 on industrial organic waste gas
[0104]
[0105] Table 2 shows the treatment effects of characteristic pollutants in industrial organic waste gas treated by catalysts in Examples 1-6.
[0106]
[0107] Table 3 shows the long-term treatment effect of catalysts used in Comparative Examples 1-4 on industrial organic waste gas.
[0108]
[0109] Table 4 shows the treatment efficacy of catalysts in industrial organic waste gas for comparative examples 1-4, focusing on the characteristic pollutants.
[0110]
Claims
1. A method for preparing a catalyst for treating industrial organic waste gas, the preparation method comprising the following steps: (1) Dissolve the active component of the catalyst, the catalyst auxiliary component and the catalyst site regulator in a dispersant to obtain an impregnation solution; (2) The impregnation liquid obtained in step (1) is thoroughly mixed with the carrier powder and the adhesive to form a slurry. (3) The obtained slurry is stamped or extruded into strips to obtain the precursor; (4) The precursor obtained in step (3) is dried; (5) The product obtained in step (4) is impregnated and activated in the catalyst activation solution; (6) The product obtained in step (5) is subjected to calcination.
2. The preparation method according to claim 1, wherein, The catalyst active component in step (1) is selected from one or more of the nitrates, sulfates, or chlorides of Fe, Co, Ni, Cu, and Mn; and / or: The catalyst promoter component is selected from one or more of the nitrates, sulfates, or chlorides of Ce, Nb, Eu, and Ho; and / or: Catalyst site modifiers are selected from one or more of the following: nitrates, sulfates, chlorides, or hydroxides of K, Na, and Mg; and / or: The dispersant is selected from pure water, 2-5% ethanol solution, or 1-5% ammonia solution.
3. The preparation method according to claim 1 or 2, wherein, After being dissolved in the dispersant, the concentration of metal ions in the active component of the catalyst is 10–350 g / L, preferably 30–300 g / L, more preferably 100–200 g / L, the concentration of metal ions in the catalyst promoter component is 1–150 g / L, preferably 40–70 g / L, and the concentration of metal ions in the catalyst site modifier is 1–10 g / L. Preferably, the pH of the impregnation solution in step (1) is between 2 and 9.
4. The preparation method according to claim 1, wherein, In step (2), the carrier powder is selected from at least one of titanium dioxide, alumina, cerium oxide, boehmite, and molecular sieves (e.g., ZSM-5 molecular sieve, NaY molecular sieve, HZSM-5 molecular sieve). When the impregnation solution is mixed with the carrier powder, the temperature is 40–80°C; Preferably, the amount of carrier powder used per kilogram of finished catalyst is 300-800g, and more preferably 500-700g.
5. The preparation method according to claim 1 or 4, wherein, The binder is selected from at least one of sodium tungstate, tungsten oxide, potassium chloride, and potassium nitrate. Preferably, the amount added is 5-15% of the mass of the carrier powder, and more preferably, it is 8-12%.
6. The preparation method according to claim 1, wherein, In step (4), the heating rate is 1-20℃ / min, the drying temperature is 100-500℃, the drying time is 1-10h, and the drying process is carried out in an atmosphere of N2, air, Ar or He.
7. The preparation method according to claim 1, wherein, In step (5), the main components of the catalyst activation liquid are compounds containing one or more of the elements Fe, Ni, Cu, Zn, Mn, Ce, Nb, and Co, as well as one or two of the elements Na and K, which are derived from the corresponding metal nitrates, sulfates, or chlorides.
8. The preparation method according to claim 7, wherein, In step (5), the concentration of the metal element in the main component of the catalyst activation solution is 50–300 g / L, preferably 80–250 g / L, and the concentration of the metal element in the ion regulator is 0.1–10 g / L. Preferably, the pH of the activation solution is between 2 and 9; Preferably, the activation temperature in step (5) is 20-60℃ and the activation time is 10-120 min.
9. The preparation method according to claim 1, wherein, In step (6), the calcination temperature is 300-800℃, the heating rate is 1-20℃ / min, the calcination time is 1-10h, and the calcination process is carried out in an atmosphere of NH3, N2, air, Ar or He.
10. The application of the catalyst prepared by the preparation method according to any one of claims 1-9 in the treatment of organic waste gas.