Preparation method of honeycomb type co oxidation catalyst for sintering flue gas

Abstract

This invention discloses a method for preparing a honeycomb CO oxidation catalyst for sintering flue gas, belonging to the field of air pollution control technology. The preparation method includes the following steps: adding titanium dioxide and silica powder to a reaction vessel, adding deionized water to prepare a slurry; adding soluble copper salt, manganese salt, and cerium salt to the slurry and stirring to dissolve; adding a precipitant to the resulting slurry to completely precipitate the copper salt, manganese salt, and cerium salt; filtering the slurry, washing the filter cake with water, filtering, drying, calcining, and grinding to obtain CO oxidation catalyst powder; mixing and kneading the CO oxidation catalyst powder with an inorganic binder, an organic binder, an extrusion aid, a structural reinforcing agent, and water, followed by aging, extrusion molding, drying, and calcination to obtain a honeycomb CO oxidation catalyst for sintering flue gas. This invention has the advantages of low production cost, low CO oxidation ignition temperature, high oxidation efficiency, and stable performance.

Description

Technical Field

[0001] This invention relates to the field of air pollution control technology, and more specifically, to a method for preparing a honeycomb CO oxidation catalyst for sintering flue gas. Background Technology

[0002] CO is the most widespread and abundant pollutant in the atmosphere, and also a significant pollutant generated during combustion. CO emissions from steel plants mainly occur during sintering, accounting for approximately 70% of total emissions. Sintering flue gas has a high CO emission concentration (approximately 6000-8000 mg / Nm³). 3 Due to the lack of corresponding treatment technologies and emission standards, emissions are unorganized.

[0003] Patent CN111185167A discloses a Pt-based catalyst for CO purification, its preparation method, and its uses. The Pt-based catalyst uses TiO2 as a support, with Pt as the main active component, CeO2 as the first co-active component, and WO3 and / or MoO3 as the second co-active component. The synergistic effect between the first and second co-active components significantly reduces the amount of precious metal Pt required. Precious metal catalysts have high activity and low ignition temperature, but they are expensive, easily poisoned, and have high operating costs.

[0004] Patent CN114558576A discloses a doped CuM2O4 multifunctional catalyst, its preparation method, and its applications. The AB2O4 (where A and B represent metal cations) spinel structure possesses advantages such as high thermal stability, resistance to sintering, and high mechanical strength and hardness. Copper-rich Cu... 1.5 Mn 1.5 O4 is the active phase of this type of catalyst, Cu 1.5 Mn 1.5 The formation of the O4 active phase generates more Lewis acid sites on the catalyst surface and alters the electron charge density in the presence of two Jahn-Teller ions (Mn and Cu), which is beneficial for the low-temperature oxidation of CO, rather than the stoichiometric compound Cu. 1.5 Mn 1.5 O4 has more lattice defects related to oxygen vacancies and is considered to be the active center of the reaction. This patent uses a co-precipitation method to prepare a multifunctional CuMn2O4 catalyst. Without the addition of a support, the specific surface area is small, which is not conducive to the dispersion of active components; without the addition of sulfate-resistant components, sulfur-containing compounds in the flue gas will cause permanent deactivation of the catalyst. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for preparing a honeycomb CO oxidation catalyst for sintering flue gas.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for preparing a honeycomb CO oxidation catalyst for sintering flue gas includes the following steps:

[0008] (1) Add titanium dioxide and silica powder to the reactor, add deionized water, and prepare a slurry with a solid content of 15-30%; add soluble copper salt, manganese salt and cerium salt to the slurry, stir to dissolve, then add precipitant, control the pH value of the system between 7.0 and 8.0, so that the copper salt, manganese salt and cerium salt are completely precipitated; after filtration, wash the obtained filter cake with water, filter, dry, calcine and grind to obtain CO oxidation catalyst powder;

[0009] (2) The obtained CO oxidation catalyst powder is mixed and kneaded with inorganic binder, organic binder, extrusion aid, structural reinforcing agent and water, and then aged, extruded, dried and calcined to obtain honeycomb CO oxidation catalyst for sintered flue gas.

[0010] Furthermore, in step (1), the mass ratio of titanium dioxide to silicon dioxide, copper salt, manganese salt, cerium salt and precipitant is (10-60):(5-15):(1-15):(1-15):(10-30):(10-25).

[0011] Furthermore, in step (2), the mass ratio of CO oxidation catalyst powder to inorganic binder, organic binder, extrusion aid, structural reinforcing agent, and water is (50-70):(1-5):(1-10):(0.1-2):(1-10):25-35).

[0012] Furthermore, the copper salt is one or both of copper nitrate and copper acetate; the manganese salt is one or both of manganese nitrate and manganese acetate; and the cerium salt is one or both of cerium nitrate and persimmon acetate.

[0013] Furthermore, the precipitant is one or more of sodium carbonate, sodium hydroxide, and ammonium bicarbonate.

[0014] Furthermore, the inorganic binder is one or more of kaolin, bentonite, attapulgite, sheep liver clay, and diatomaceous earth; the organic binder is one or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, polyethylene oxide, and polyvinyl alcohol.

[0015] Furthermore, the extrusion aid is one or more of guar gum powder, stearic acid, and lactic acid; the structural reinforcing agent is one or more of alumina fiber, glass fiber, and polypropylene fiber.

[0016] Furthermore, in step (2), the drying temperature is 40-100℃ and the drying time is 10-15 days; the calcination temperature is 500-600℃ and the calcination time is 2-4 hours.

[0017] Furthermore, titanium dioxide is in the anatase crystal form.

[0018] In summary, the present invention has the following beneficial effects:

[0019] This invention uses titanium dioxide and silicon dioxide as carriers and transition metals and rare earth metal oxides as active components to prepare CO oxidation catalyst powder by deposition precipitation method. It has the advantages of low production cost, low CO ignition temperature, high oxidation efficiency and stable performance. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The honeycomb CO oxidation catalyst for sintering flue gas of this invention comprises the following components in weight percentage: 40-80% TiO2, 5-15% SiO2, 1-15% CuO, 1-15% MnO2, and 5-25% CeO2. The catalyst preparation method is as follows:

[0022] (1) Add titanium dioxide (anatase crystal form) and silica powder to a reactor, add deionized water, and prepare a slurry with a solid content of 15-30%; add soluble copper salt, manganese salt and cerium salt to the slurry, stir to dissolve, then add a precipitant, control the pH value of the system between 7.0 and 8.0, so that the copper salt, manganese salt and cerium salt are completely precipitated; after filtration, wash the obtained filter cake with water, filter, dry, calcine and grind to obtain CO oxidation catalyst powder. The mass ratio of titanium dioxide to silica, copper salt, manganese salt, cerium salt and precipitant is (10-60):(5-15):(1-15):(1-15):(10-30):(10-25).

[0023] Wherein: copper salt is one or both of copper nitrate and copper acetate; manganese salt is one or both of manganese nitrate and manganese acetate; cerium salt is one or both of cerium nitrate and persimmon acetate; precipitant is one or more of sodium carbonate, sodium hydroxide, and ammonium bicarbonate.

[0024] (2) The obtained CO oxidation catalyst powder is mixed and kneaded with inorganic binder, organic binder, extrusion aid, structural reinforcing agent and water, and then aged, extruded, dried (drying temperature is 40-100℃, drying time is 10-15 days) and calcined (calcination temperature is 500-600℃, calcination time is 2-4h) to obtain a honeycomb CO oxidation catalyst for sintered flue gas. The mass ratio of CO oxidation catalyst powder to inorganic binder, organic binder, extrusion aid, structural reinforcing agent and water is (50-70):(1-5):(1-10):(0.1-2):(1-10):25-35).

[0025] Among them: the inorganic binder is one or more of kaolin, bentonite, attapulgite, sheep liver clay, and diatomaceous earth; the organic binder is one or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, polyethylene oxide, and polyvinyl alcohol; the extrusion aid is one or more of guar gum powder, stearic acid, and lactic acid; and the structural reinforcing agent is one or more of alumina fiber, glass fiber, and polypropylene fiber.

[0026] Example 1

[0027] The preparation method of the honeycomb CO oxidation catalyst (TiO2:SiO2:CuO:MnO2:CeO2=75:5:7.5:7.5:5) for sintering flue gas includes the following steps:

[0028] (1) Preparation of CO oxidation catalyst powder

[0029] S1. Add 7.5 kg of titanium dioxide and 0.5 kg of silica powder to the reactor, add deionized water, and prepare a slurry with a solid content of 20%.

[0030] S2. Add 2.28 kg of copper nitrate trihydrate, 2.11 kg of manganese acetate tetrahydrate and 1.26 kg of cerium nitrate hexahydrate to the slurry obtained in S1, and stir to dissolve.

[0031] S3. Add 2.5 kg of anhydrous sodium carbonate as a precipitant to the slurry obtained in S2, and control the pH value of the slurry at 7.5 to ensure that copper salt, manganese salt and cerium salt are completely precipitated.

[0032] S4. The slurry obtained from S3 by plate and frame filtration is washed three times with deionized water at a mass of 3 times the filter cake, and then subjected to plate and frame filtration.

[0033] S5. The filter cake obtained in S4 is dried at 100℃ for 12 hours, then calcined at 450℃ for 4 hours, and then the calcined material is ground into particles with a particle size greater than 800 mesh to obtain CO oxidation catalyst powder.

[0034] (2) Preparation of mixed clay, molding, drying and calcination

[0035] The CO oxidation catalyst powder obtained above was kneaded with 0.5 kg kaolin, 0.5 kg carboxymethyl cellulose, 0.02 kg stearic acid, 0.5 kg glass fiber, and 5.3 kg water. The kneaded material was aged at room temperature for 24 hours and then extruded into a honeycomb preform. It was then dried at 40°C for 10 days and then at 60°C for 5 days. The dried material was calcined at 550°C for 3 hours and then cooled to room temperature to obtain the honeycomb CO oxidation catalyst.

[0036] Example 1 shows the CO oxidation performance test of the honeycomb catalyst, with an outlet CO value of 1767 mg / Nm³. 3 The corresponding CO conversion rate was 77.9%, indicating high CO oxidation activity.

[0037] Comparative Example 1

[0038] A honeycomb CO oxidation catalyst for sintering flue gas was prepared according to Example 1, except that the addition of silicon dioxide was omitted and the amount of titanium dioxide added was increased to 8.0 kg, so that the catalyst component ratio was TiO2:CuO:MnO2:CeO2 = 80:7.5:7.5:5.

[0039] The CO oxidation performance test of Comparative Example 1 showed an outlet CO value of 2060 mg / Nm³. 3 The corresponding CO conversion rate was 74.3%, which was slightly lower than that of Example 1. This was mainly due to the lack of SiO2 modification, which reduced the heat resistance of the catalyst support and the dispersion of active sites compared to Example 1.

[0040] Example 2

[0041] The preparation method of a honeycomb CO oxidation catalyst (TiO2:SiO2:CuO:MnO2:CeO2=70:10:6:4:10) for sintering flue gas includes the following steps:

[0042] (1) Preparation of CO oxidation catalyst powder

[0043] S1. Add 7.0 kg of titanium dioxide and 1.0 kg of silica powder to the reactor, add deionized water, and prepare a slurry with a solid content of 15%.

[0044] S2. Add 1.82 kg of copper nitrate trihydrate, 1.13 kg of manganese acetate tetrahydrate and 2.52 kg of cerium nitrate hexahydrate to the slurry obtained in S1, and stir to dissolve.

[0045] S3. Add about 2.3 kg of anhydrous sodium carbonate as a precipitant to the slurry obtained in S2, and control the pH value of the slurry at 7.0 to ensure that copper salt, manganese salt and cerium salt are completely precipitated.

[0046] S4. The slurry obtained from plate and frame filtration S3 is washed three times with deionized water at a mass of 2.5 times the filter cake, and then subjected to plate and frame filtration.

[0047] S5. The filter cake obtained in S4 is dried at 120°C for 8 hours, then calcined at 450°C for 4 hours, and then the calcined material is ground into particles with a particle size greater than 800 mesh to obtain CO oxidation catalyst powder.

[0048] (2) Preparation of mixed clay, molding, drying and calcination

[0049] The CO oxidation catalyst powder obtained above was kneaded with 0.3 kg bentonite, 0.3 kg polyvinyl alcohol, 0.1 kg guar gum powder, 1.0 kg alumina fiber, and 5.0 kg water. The kneaded material was aged at room temperature for 36 hours and then extruded into a honeycomb preform. It was then dried at 40°C for 12 days and then at 80°C for 3 days. The dried material was calcined at 500°C for 4 hours and then cooled to room temperature to obtain the honeycomb CO oxidation catalyst.

[0050] Example 2 shows the CO oxidation performance test of the honeycomb catalyst, with an outlet CO value of 1615 mg / Nm³. 3 The corresponding CO conversion rate was 79.8%, and the CO oxidation activity was slightly higher than that in Example 1. This was mainly due to the increased SiO2 content, which increased the specific surface area; at the same time, the increased cerium content enhanced the oxygen storage capacity and promoted the CO oxidation reaction.

[0051] Comparative Example 2

[0052] A honeycomb CO oxidation catalyst for sintering flue gas was prepared according to Example 2, except that the addition of copper nitrate trihydrate was omitted and the addition of manganese acetate tetrahydrate was increased to 2.82 kg, so that the catalyst component ratio was TiO2:SiO2:MnO2:CeO2=70:10:10:10.

[0053] The CO oxidation performance test of Comparative Example 2 showed an outlet CO value of 5882 mg / Nm³. 3 The corresponding CO conversion rate was only 26.5%, far lower than that of Example 2. This is mainly due to the lack of the active component copper, resulting in low activity of the single manganese oxide.

[0054] Example 3

[0055] The preparation method of a honeycomb CO oxidation catalyst (TiO2:SiO2:CuO:MnO2:CeO2=65:10:10:5:10) for sintering flue gas includes the following steps:

[0056] (1) Preparation of CO oxidation catalyst powder

[0057] S1. Add 6.5 kg of titanium dioxide and 1.0 kg of silica powder to the reactor, add deionized water, and prepare a slurry with a solid content of 15%.

[0058] S2. Add 3.04 kg of copper nitrate trihydrate, 1.41 kg of manganese acetate tetrahydrate and 2.52 kg of cerium nitrate hexahydrate to the slurry obtained in S1, and stir to dissolve.

[0059] S3. Add about 3.1 kg of anhydrous sodium carbonate as a precipitant to the slurry obtained in S2, and control the pH value of the slurry at 8.0 to ensure that copper salt, manganese salt and cerium salt are completely precipitated.

[0060] S4, the slurry S3 obtained by plate and frame filtration is washed with deionized water with 4 times the mass of filter cake, washed three times, and then filtered through plate and frame.

[0061] S5. The filter cake obtained in S4 is dried at 100℃ for 12 hours, then calcined at 450℃ for 4 hours, and then the calcined material is ground into particles with a particle size greater than 800 mesh to obtain CO oxidation catalyst powder.

[0062] (2) Preparation of mixed clay, molding, drying and calcination

[0063] The CO oxidation catalyst powder obtained above was kneaded with 0.1 kg attapulgite, 1.0 kg hydroxypropyl methylcellulose, 0.05 kg lactic acid, 0.5 kg glass fiber, 0.2 kg polypropylene fiber, and 5.5 kg water. The kneaded material was aged at room temperature for 48 hours and then extruded into a honeycomb preform. It was then dried at 40°C for 14 days and then at 100°C for 1 day. The dried material was calcined at 600°C for 2 hours and then cooled to room temperature to obtain the honeycomb CO oxidation catalyst.

[0064] Example 3: CO oxidation performance test of the honeycomb catalyst showed an outlet CO value of 1518 mg / Nm³. 3 The corresponding CO conversion rate was 81.0%, and the CO oxidation activity was close to that of Example 2. This indicates that simply increasing the content of the active component copper has little effect on the CO oxidation activity of the catalyst.

[0065] Comparative Example 3

[0066] A honeycomb CO oxidation catalyst for sintering flue gas was prepared according to Example 3, except that the addition of manganese acetate tetrahydrate was omitted and the addition of copper nitrate trihydrate was increased to 4.56 kg, so that the catalyst component ratio was TiO2:SiO2:CuO:CeO2 = 65:10:15:10.

[0067] The CO oxidation performance test of Comparative Example 3 showed that the CO outlet value was 5351 mg / Nm³. 3The corresponding CO conversion rate was only 33.1%, far lower than that of Example 3. This is mainly due to the lack of the active component manganese, resulting in low activity of single copper oxides, even with a high copper content.

[0068] Example 4

[0069] The preparation method of a honeycomb CO oxidation catalyst (TiO2:SiO2:CuO:MnO2:CeO2=50:15:5:5:25) for sintering flue gas includes the following steps:

[0070] (1) Preparation of CO oxidation catalyst powder

[0071] S1. Add 5.0 kg of titanium dioxide and 1.5 kg of silica powder to the reactor, add deionized water, and prepare a slurry with a solid content of 30%.

[0072] S2. Add 1.52 kg of copper nitrate trihydrate, 1.41 kg of manganese acetate tetrahydrate and 6.31 kg of cerium nitrate hexahydrate to the slurry obtained in S1, and stir to dissolve.

[0073] S3. Add about 3.8 kg of anhydrous sodium carbonate as a precipitant to the slurry obtained in S2, and control the pH value of the slurry at 7.2 to ensure that copper salt, manganese salt and cerium salt are completely precipitated.

[0074] S4. The slurry obtained from plate and frame filtration S3 is washed with 2.5 times the mass of the filter cake by deionized water, washed three times, and then filtered by plate and frame filtration.

[0075] S5. The filter cake obtained in S4 is dried at 120°C for 8 hours, then calcined at 450°C for 4 hours, and then the calcined material is ground into particles with a particle size greater than 800 mesh to obtain CO oxidation catalyst powder.

[0076] (2) Preparation of mixed clay, molding, drying and calcination

[0077] The CO oxidation catalyst powder obtained above was kneaded with 0.5 kg of sheep liver clay, 0.5 kg of polyethylene oxide, 0.2 kg of guar gum powder, 0.5 kg of alumina fiber, 0.2 kg of polypropylene fiber, and 5.0 kg of water. The kneaded material was aged at room temperature for 12 hours and then extruded into a honeycomb preform. After that, it was dried at 60°C for 15 days. The dried material was calcined at 580°C for 3 hours and then cooled to room temperature to obtain the honeycomb CO oxidation catalyst.

[0078] Example 4: CO oxidation performance test of the honeycomb catalyst showed an outlet CO value of 865 mg / Nm³. 3 The corresponding CO conversion rate was 89.2%, showing a significant improvement in CO oxidation activity compared to Example 3. This is mainly due to the substantial increase in cerium content, which significantly enhanced oxygen vacancy concentration and resistance to poisoning.

[0079] Comparative Example 4

[0080] A honeycomb CO oxidation catalyst for sintering flue gas was prepared according to Example 4, except that the addition of cerium nitrate hexahydrate was omitted and the amount of titanium dioxide added was increased to 7.5 kg, so that the catalyst component ratio was TiO2:SiO2:CuO:MnO2=75:15:5:5.

[0081] The CO oxidation performance test of Comparative Example 4 showed that the CO outlet value was 3837 mg / Nm³. 3 The corresponding CO conversion rate was only 52.0%, far lower than that of Example 4. This is mainly due to the absence of cerium, which results in the loss of oxygen storage centers and a limited oxygen transfer rate, leading to a decrease in CO conversion rate.

[0082] Example 5

[0083] The preparation method of the honeycomb CO oxidation catalyst (TiO2:SiO2:CuO:MnO2:CeO2 = 40:15:10:10:25) for sintering flue gas includes the following steps:

[0084] (1) Preparation of CO oxidation catalyst powder

[0085] S1. Add 4.0 kg of titanium dioxide and 1.5 kg of silica powder to the reactor, add deionized water, and prepare a slurry with a solid content of 30%.

[0086] S2. Add 3.04 kg of copper nitrate trihydrate, 2.82 kg of manganese acetate tetrahydrate and 6.31 kg of cerium nitrate hexahydrate to the slurry obtained in S1, and stir to dissolve.

[0087] S3. Add about 5.3 kg of anhydrous sodium carbonate as a precipitant to the slurry obtained in S2, and control the pH value of the slurry at 8.0 to ensure that copper salt, manganese salt and cerium salt are completely precipitated.

[0088] S4. The slurry obtained from plate and frame filtration S3 is washed with 2.5 times the mass of the filter cake by deionized water, washed three times, and then filtered by plate and frame filtration.

[0089] S5. The filter cake obtained in S4 is dried at 100℃ for 12 hours, then calcined at 450℃ for 4 hours, and then the calcined material is ground into particles with a particle size greater than 800 mesh to obtain CO oxidation catalyst powder.

[0090] (2) Preparation of mixed clay, molding, drying and calcination

[0091] The CO oxidation catalyst powder obtained above was kneaded with 0.3 kg bentonite, 0.3 kg polyvinyl alcohol, 0.1 kg guar gum powder, 1.0 kg alumina fiber, and 5.0 kg water. The kneaded material was aged at room temperature for 36 hours and then extruded into a honeycomb preform. It was then dried at 40°C for 12 days and then at 80°C for 3 days. The dried material was calcined at 500°C for 4 hours and then cooled to room temperature to obtain the honeycomb CO oxidation catalyst.

[0092] Example 5: CO oxidation performance test of the honeycomb catalyst showed an outlet CO value of 553 mg / Nm³. 3 The corresponding CO conversion rate was 93.1%, indicating a further improvement in CO oxidation activity compared to Example 4. This is mainly due to the further increase in the content of the active components copper and manganese, which enhanced the Cu-Mn synergistic effect and further improved the catalyst's ability to oxidize CO.

[0093] Comparative Example 5

[0094] A honeycomb CO oxidation catalyst for sintering flue gas was prepared according to Example 5, except that the addition of titanium dioxide was omitted and the amount of silicon dioxide added was increased to 5.5 kg, making the catalyst composition ratio SiO2:CuO:MnO2:CeO2 = 55:10:10:25. The rest of the catalyst powder preparation and honeycomb forming steps were completely consistent with Example 5. However, the formulation lacked the skeletal support of titanium dioxide, and the honeycomb extrusion molding failed, so the subsequent CO oxidation performance evaluation experiments could not be completed.

[0095] The method for evaluating the CO oxidation performance of the honeycomb catalyst of this invention is as follows: The honeycomb CO oxidation catalyst is cut into small test blocks with a length × width × height of 20 mm × 20 mm × 50 mm. These blocks are then wrapped with heat-insulating cotton and placed in a fixed-bed reactor to seal the catalyst test block against the inner wall of the reactor, preventing short-circuiting of the gas flow. Then, simulated flue gas is introduced, with a CO concentration of 8000 mg / Nm³. 3 O2 concentration 15%, CO2 concentration 6%, H2O content 15%, SO2 concentration 30 mg / Nm 3 NO concentration 50 mg / Nm 3 The balance gas is nitrogen, and the controlled volume hourly space velocity is 6000 h⁻¹. -1 The reaction temperature was 280℃, causing the catalyst to undergo the following reaction: CO + 1 / 2O₂ = CO₂. The CO concentration at the reactor outlet was monitored online using a flue gas analyzer, and the CO conversion rate was calculated.

[0096] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for producing a honeycomb CO oxidation catalyst for sintering flue gas, characterized by, Includes the following steps: (1) Add titanium dioxide and silica powder to the reactor, add deionized water, and prepare a slurry with a solid content of 15-30%; add soluble copper salt, manganese salt and cerium salt to the slurry, stir to dissolve, then add precipitant, control the pH value of the system between 7.0 and 8.0, so that the copper salt, manganese salt and cerium salt can be completely precipitated. After filtration, the obtained filter cake is washed with water, filtered, dried, calcined and ground to obtain CO oxidation catalyst powder; (2) The obtained CO oxidation catalyst powder is mixed and kneaded with inorganic binder, organic binder, extrusion aid, structural reinforcing agent and water, and then aged, extruded, dried and calcined to obtain honeycomb CO oxidation catalyst for sintered flue gas.

2. The method for preparing a honeycomb CO oxidation catalyst for sintering flue gas according to claim 1, characterized in that, In step (1), the mass ratio of titanium dioxide to silicon dioxide, copper salt, manganese salt, cerium salt and precipitant is (10-60):(5-15):(1-15):(1-15):(10-30):(10-25).

3. The method for preparing a honeycomb CO oxidation catalyst for sintering flue gas according to claim 1, characterized in that, In step (2), the mass ratio of CO oxidation catalyst powder to inorganic binder, organic binder, extrusion aid, structural reinforcing agent, and water is (50-70):(1-5):(1-10):(0.1-2):(1-10):25-35).

4. The method for preparing a honeycomb CO oxidation catalyst for sintering flue gas according to claim 1, characterized in that, The copper salt is one or both of copper nitrate and copper acetate; the manganese salt is one or both of manganese nitrate and manganese acetate; the cerium salt is one or both of cerium nitrate and persimmon acetate.

5. The method for preparing a honeycomb CO oxidation catalyst for sintering flue gas according to claim 1, characterized in that, The precipitant is one or more of sodium carbonate, sodium hydroxide, and ammonium bicarbonate.

6. The method for preparing a honeycomb CO oxidation catalyst for sintering flue gas according to claim 1, characterized in that, The inorganic binder is one or more of kaolin, bentonite, attapulgite, sheep liver clay, and diatomaceous earth; the organic binder is one or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, polyethylene oxide, and polyvinyl alcohol.

7. The method for preparing a honeycomb CO oxidation catalyst for sintering flue gas according to claim 1, characterized in that, The extrusion aid is one or more of guar gum powder, stearic acid, and lactic acid; the structural reinforcement is one or more of alumina fiber, glass fiber, and polypropylene fiber.

8. The method for preparing a honeycomb CO oxidation catalyst for sintering flue gas according to claim 1, characterized in that, In step (2), the drying temperature is 40-100℃ and the drying time is 10-15 days; the calcination temperature is 500-600℃ and the calcination time is 2-4 hours.

9. The method for preparing a honeycomb CO oxidation catalyst for sintering flue gas according to claim 1, characterized in that, Titanium dioxide is in the anatase crystal form.