Nano carbonyl sulfide hydrolysis catalyst carrier as well as preparation method and application thereof

Abstract

The invention provides a nano carbonyl sulfide hydrolysis catalyst carrier as well as a preparation method and application thereof. According to the catalyst carrier, triblock copolymers P123 and SBA-15 are taken as template agents, aluminum chloride hexahydrate is taken as a carrier precursor, and titanium dioxide and sodium metaaluminate are taken as doping elements and regulators; the specific surface area of the catalyst carrier prepared by a nano chemical synthesis method reaches 340-380m < 2 > / g. Through the innovative preparation process, the specific surface area of the catalyst carrier is remarkably increased, so that the conversion efficiency of COS in blast furnace gas is improved, the service life of the hydrolysis catalyst is prolonged, green development of related industries is promoted, and environmental pollution is effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of catalysts, and particularly relates to a nano carbonyl sulfide hydrolysis catalyst support, a preparation method thereof, and an application thereof. Background Art

[0002] In the production processes of industries such as steelmaking, coking, petrochemical, and chemical industries, the gas often contains sulfides in the form of carbonyl sulfide (COS). These sulfides will be converted into substances such as SO2 and SO3 after combustion and emitted into the atmosphere, becoming the main air pollutants, seriously threatening the ecological environment and human health. Therefore, it is urgent to effectively remove carbonyl sulfide from the gas.

[0003] Among many methods for removing carbonyl sulfide, the hydrolysis method has attracted much attention due to its strong practicability. Through the hydrolysis process, carbonyl sulfide can be converted into more easily treated hydrogen sulfide or sulfur, creating favorable conditions for subsequent conversion and recovery. Currently, COS hydrolysis catalysts mainly consist of two parts: a support and an active component. Among them, γ-Al2O3 is mostly used as the support, and the active component is generally an alkali metal or alkaline earth element. The catalyst support needs to have a large specific surface area so as to provide sufficient reaction area and then achieve a high catalytic efficiency. Therefore, improving the specific surface area of the support has become a reliable way to enhance the catalytic performance of the catalyst.

[0004] To overcome this problem, researchers in related fields have carried out a large number of studies and achieved certain results. For example, CN106861665B discloses an alumina carbonyl sulfide hydrolysis catalyst and a preparation method thereof. This method uses polystyrene microspheres as the macroporous template, P123 as the mesoporous templating agent, soluble aluminum salt as the catalyst support precursor, and potassium oxalate coordination solution as the active component precursor. By using organic microspheres with controllable sizes to construct the macroporous template and regulating the mesopores with the mesoporous templating agent, a γ-Al2O3-based COS hydrolysis catalyst with a hierarchical pore structure of macropores, mesopores, and micropores is successfully prepared, increasing the void volume to a certain extent. However, its specific surface area still does not reach the ideal state, limiting the further improvement of the catalytic efficiency.

[0005] Another example is that CN 116020434B discloses a carbonyl sulfide hydrolysis catalyst that does not accumulate sulfur and is resistant to deactivation. This catalyst uses polystyrene microspheres as the hard template and triblock copolymer as the soft template, and by using the solvent evaporation-induced self-assembly assisted hydrothermal synthesis method, a MgAl2O4 catalyst with a high specific surface area and a three-dimensional ordered macroporous-mesoporous structure is prepared. Unfortunately, this patent does not disclose key information such as its specific surface area, making the practical application and further optimization of this technology uncertain. In addition, due to the need for a hard template and solvent evaporation in this method, the preparation cost is high and the pollution is large, which is not suitable for popularization and application.

[0006] In summary, there is still room for improvement in the specific surface area and related properties of existing carbonyl sulfide hydrolysis catalysts. Developing a nano carbonyl sulfide hydrolysis catalyst with a higher specific surface area and better catalytic efficiency and its preparation method has important practical significance for promoting the green development of related industries and reducing environmental pollution. Summary of the Invention

[0007] In order to overcome the problems of low hydrolysis conversion rate and short service life of existing COS hydrolysis catalysts, the purpose of the present invention is to provide a nano carbonyl sulfide hydrolysis catalyst carrier, its preparation method and application. Through an innovative preparation process, the specific surface area of the catalyst carrier is significantly increased, thereby improving the conversion efficiency of COS in blast furnace gas and extending the service life of the hydrolysis catalyst, thus promoting the green development of related industries and effectively reducing environmental pollution.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] The first aspect of the present invention provides a preparation method of a nano carbonyl sulfide hydrolysis catalyst carrier. The catalyst carrier uses triblock copolymer P123 and SBA-15 as template agents, aluminum chloride hexahydrate as a carrier precursor, and titanium dioxide and sodium metaaluminate as doping elements and regulators; the catalyst carrier is prepared by a nano chemical synthesis method, including the following steps:

[0010] S1. First, dissolve aluminum chloride hexahydrate and titanium dioxide in ultrapure water, denoted as solution A; dissolve sodium metaaluminate in ultrapure water, denoted as solution B; dissolve P123 and SBA-15 in ultrapure water to form a composite template agent solution.

[0011] S2. At room temperature, slowly add solution B to solution A, stop when the pH value reaches a certain value, and stir for a period of time to obtain a white precipitate.

[0012] S3. Then mix the white precipitate obtained in S2 with the composite template agent solution and mechanically stir for a period of time. The mixed solution is dried to obtain a composite.

[0013] S4. The dried composite is calcined at a constant temperature to obtain mesoporous γ-Al2O3.

[0014] S5. Granulate the mesoporous γ-Al2O3 and calcine it at high temperature again to obtain the nano carbonyl sulfide hydrolysis catalyst carrier.

[0015] Furthermore, the mass ratio of P123 to SBA-15 in the template agent is 1:0.5 - 2; the mass ratio of the carrier precursor to the template agent is 5 - 10:1; the mass ratio of titanium dioxide to the template agent is 0.5 - 2:1; the mass ratio of sodium metaaluminate to the template agent is 0.1 - 1:1.

[0016] Further, in S1, the molar concentration of the aluminum chloride hexahydrate solution is 0.2 - 0.4 mol / L, the molar concentration of the titanium dioxide solution is 0.2 - 0.4 mol / L, the molar concentration of the sodium aluminate solution is 0.4 - 0.6 mol / L, and the concentration of the composite template agent solution is 0.1 - 0.2 mol / L.

[0017] Further, in S2, the B solution is slowly added to the A solution and stopped when the pH value reaches 9.0 - 11.0, and the stirring time is 1 - 3 hours.

[0018] Further, in S3, the white precipitate is stirred with the composite template agent solution for 2 - 4 hours, the drying temperature is 80 - 120 °C, and the drying time is 3 - 5 h.

[0019] Further, in S4, the treatment conditions for the isothermal calcination include: the heating rate is 5 - 20 °C / min, the temperature is raised to 450 - 650 °C, and the isothermal calcination is carried out for 3 - 6 hours.

[0020] Further, in S5, the particle size of the granulation is 0.5 - 0.7 mm, and the treatment conditions for the high-temperature calcination include: the heating rate is 3 - 10 °C / min, the holding temperature is 400 - 600 °C, and the holding time is 2 - 5 h.

[0021] The second aspect of the present invention provides a nano carbonyl sulfide hydrolysis catalyst carrier prepared by the method described in the first aspect. The specific surface area of the catalyst carrier is 340 - 380 m 2 / g.

[0022] The third aspect of the present invention provides a nano carbonyl sulfide hydrolysis catalyst prepared based on the carrier described in the second aspect. Among them, the carrier described in the second aspect is impregnated in a 3 - 12% potassium carbonate solution for 4 - 8 h, then dried at 120 - 160 °C for 4 - 6 h, and then calcined at 500 - 600 °C for 3 - 6 h to obtain the nano carbonyl sulfide hydrolysis catalyst. The specific surface area of this catalyst is 320 - 360 m 2 / g. In some specific embodiments, the carrier is impregnated in a 10% potassium carbonate solution for 4 h, then dried at 150 °C for 5 h, and then calcined at 550 °C for 4 h to obtain, and the specific surface area of the catalyst is 356.7 m 2 / g.

[0023] Further, the conversion efficiency of COS in blast furnace gas by using the catalyst is higher than 90% under the conditions of 110 °C and a volume space velocity of 1500 - 6000 h -1 .

[0024] The fourth aspect of the present invention provides the use of the method described in the first aspect, or the nano carbonyl sulfide hydrolysis catalyst support described in the second aspect, or the nano carbonyl sulfide hydrolysis catalyst described in the third aspect in carbonyl sulfide removal.

[0025] The beneficial effects of the present invention compared with the prior art are as follows:

[0026] 1. Significantly improve the COS conversion efficiency: In this application, by using the triblock copolymer P123 and SBA-15 to form a composite template agent and preparing the catalyst support by nano chemical synthesis method, the specific surface area of the catalyst support is greatly increased, and at the same time, the formed pore structure is more uniform. This improvement enables the catalyst to act more effectively on COS in blast furnace gas, significantly improving the conversion efficiency of COS. Compared with the hydrolysis conversion rate of about 80% of the existing COS hydrolysis catalysts, the catalyst of the present invention can achieve higher conversion, thus more efficiently treating COS in blast furnace gas.

[0027] 2. Prolong the service life of the hydrolysis catalyst: The catalyst support obtained based on the above unique preparation method helps to prolong the service life of the hydrolysis catalyst. The problem of the short service life of the existing catalyst is effectively improved, reducing the cost and time loss caused by frequent catalyst replacement, and providing a strong guarantee for the long-term stable operation of the relevant production process.

[0028] 3. Low raw material cost and convenient access: The carrier precursor aluminum chloride hexahydrate used in the present invention is very common in the chemical industry. Its production process is mature and the market supply is sufficient, which makes its cost relatively low. For the large-scale preparation of nano-aluminum oxide support, the low raw material cost can significantly reduce the overall production cost and improve economic benefits. At the same time, the sufficient market supply also ensures the convenience of raw material access, which is conducive to the development of large-scale industrial production.

[0029] 4. Precise control of the reaction process and product structure: During the preparation process, by flexibly adjusting the ratios of aluminum chloride hexahydrate, titanium dioxide, and sodium metaaluminate to the template agent, reaction temperature, and reaction time, etc., the reaction process can be more precisely controlled. Specifically, adding titanium dioxide to the system can significantly improve the activity and stability of the catalyst; sodium metaaluminate plays a role in regulating the chemical composition and physical properties of the catalyst. For example, increasing the proportion of sodium metaaluminate will increase the alkalinity of the catalyst, thereby improving the hydrolysis performance of carbonyl sulfide. This precise control can realize the regulation of the structure and particle size of the finally formed nano-aluminum oxide support, so that catalyst supports with specific properties can be customized according to different actual application requirements, enhancing the adaptability and flexibility of the present invention in practical applications.

[0030] 5. Promote the green development of the industry and reduce environmental pollution: By efficiently converting COS in blast furnace gas, the environmental pollution caused by COS emissions is reduced. At the same time, the extended service life of the catalyst reduces the waste generated from frequent catalyst replacement. The present invention promotes the green development of related industries in multiple aspects and plays a positive role in environmental protection. Detailed implementation manners

[0031] The examples given are for better illustrating the present invention, but the content of the present invention is not limited only to the given examples. Therefore, those skilled in the art who make non-essential improvements and adjustments to the implementation manners based on the above-described invention content still fall within the protection scope of the present invention.

[0032] In the ranges disclosed herein, the endpoints and any values are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

[0033] The present invention will be described in detail below through examples. It should be understood that the following examples are only used to further explain and illustrate the content of the present invention exemplarily and are not used to limit the present invention.

[0034] The detection methods involved in the following examples include:

[0035] Specific surface area measurement method: BET specific surface area test method (GB / T 6609.35);

[0036] The hydrolysis conversion efficiency of the catalyst for COS is determined by gas chromatography, and the detection conditions are as follows:

[0037] Gas distribution system parameters: COS, 300 - 400 ppm; hydrogen sulfide, 60 - 80 ppm; chlorine, 0.1%; oxygen, 1%; the rest is nitrogen;

[0038] Gas flow rate: 1 L / min;

[0039] Catalyst: 100 grams;

[0040] Reactor temperature: 120 °C;

[0041] Space velocity: 6000 h -1 .

[0042] Hydrolysis conversion efficiency (%) = (inlet COS concentration - outlet COS concentration) / inlet COS concentration × 100%.

[0043] Example 1

[0044] This example provides a carrier for a nano carbonyl sulfide hydrolysis catalyst. The catalyst carrier uses triblock copolymer P123 and SBA-15 as template agents, aluminum chloride hexahydrate as the carrier precursor, and titanium dioxide and sodium metaaluminate as doping elements and regulators. The catalyst carrier is prepared by a nano chemical synthesis method, including the following steps:

[0045] S1. First, dissolve 0.2 mol of aluminum chloride hexahydrate and 0.2 mol of titanium dioxide in 1 L of ultrapure water, denoted as solution A; dissolve 0.6 mol of sodium metaaluminate in 1 L of ultrapure water, denoted as solution B; dissolve 0.1 mol of P123 and 0.05 mol of SBA-15 in 1 L of ultrapure water to form a composite template agent solution.

[0046] S2. At room temperature, slowly add solution B to solution A and stop when the pH value reaches 9.0, then stir for 2 hours to obtain a white precipitate.

[0047] S3. Then mix the white precipitate obtained in S2 with the composite template agent solution and mechanically stir for 2 hours. Place the mixed solution in an oven and dry it at 100 °C for 4 hours to obtain a composite.

[0048] S4. Put the dried composite into a high-temperature muffle furnace for constant-temperature calcination. The conditions for constant-temperature calcination are: heat up to 600 °C at a heating rate of 20 °C / min and keep the temperature constant for 4 hours to obtain mesoporous γ-Al2O3.

[0049] S5. Granulate the mesoporous γ-Al2O3 with a granule size of 0.5 - 0.7 mm, and then perform high-temperature calcination again to obtain the nano carbonyl sulfide hydrolysis catalyst carrier. The treatment conditions for the high-temperature calcination include: a heating rate of 5 °C / min, a holding temperature of 450 °C, and a holding time of 3 h.

[0050] Example 2

[0051] This example provides a carrier for a nano carbonyl sulfide hydrolysis catalyst. The catalyst carrier uses triblock copolymer P123 and SBA-15 as template agents, aluminum chloride hexahydrate as the carrier precursor, and titanium dioxide and sodium metaaluminate as doping elements and regulators. The catalyst carrier is prepared by a nano chemical synthesis method, including the following steps:

[0052] S1. First, dissolve 0.25 mol of aluminum chloride hexahydrate and 0.25 mol of titanium dioxide in 1 L of ultrapure water, denoted as solution A; dissolve 0.5 mol of sodium metaaluminate in 1 L of ultrapure water, denoted as solution B; dissolve 0.15 mol of P123 and 0.05 mol of SBA-15 in 1 L of ultrapure water to form a composite template agent solution.

[0053] S2. At room temperature, slowly add solution B to solution A, stop when the pH value reaches 9.0, and stir for 2 hours to obtain a white precipitate.

[0054] S3. Then mix the white precipitate obtained in S2 with the composite template agent solution and mechanically stir for 2 hours. Place the mixed solution in an oven and dry it at 100 °C for 4 hours to obtain a composite.

[0055] S4. Put the dried composite into a high-temperature muffle furnace for isothermal calcination. The conditions for isothermal calcination are: heat up to 600 °C at a heating rate of 20 °C / min and isothermally calcine for 4 hours to obtain mesoporous γ-Al2O3.

[0056] S5. Granulate the mesoporous γ-Al2O3 with a particle size of 0.5 - 0.7 mm. After high-temperature calcination again, the nano carbonyl sulfide hydrolysis catalyst support is obtained. The treatment conditions for the high-temperature calcination include: a heating rate of 5 °C / min, a holding temperature of 450 °C, and a holding time of 3 h.

[0057] Example 3

[0058] This example provides a nano carbonyl sulfide hydrolysis catalyst support. The catalyst support uses triblock copolymer P123 and SBA-15 as template agents, aluminum chloride hexahydrate as the support precursor, titanium dioxide and sodium metaaluminate as doping elements and regulators, and uses a nano chemical synthesis method to prepare the catalyst support, including the following steps:

[0059] S1. First, dissolve 0.4 mol of aluminum chloride hexahydrate and 0.25 mol of titanium dioxide in 1 L of ultrapure water, denoted as solution A; dissolve 0.4 mol of sodium metaaluminate in 1 L of ultrapure water, denoted as solution B; dissolve 0.15 mol of P123 and 0.05 mol of SBA-15 in 1 L of ultrapure water to form a composite template agent solution.

[0060] S2. At room temperature, slowly add solution B to solution A, stop when the pH value reaches 10.0, and stir for 2 hours to obtain a white precipitate.

[0061] S3. Then mix the white precipitate obtained in S2 with the composite template agent solution and mechanically stir for 3 hours. Place the mixed solution in an oven and dry it at 100 °C for 4 hours to obtain a composite.

[0062] S4. Put the dried composite into a high-temperature muffle furnace for isothermal calcination. The conditions for isothermal calcination are: heat up to 600 °C at a heating rate of 20 °C / min and isothermally calcine for 4 hours to obtain mesoporous γ-Al2O3.

[0063] S5. Granulate the mesoporous γ-Al₂O₃ with a granule size of 0.5 - 0.7 mm. After high-temperature calcination again, the nano carbonyl sulfide hydrolysis catalyst support is obtained. The treatment conditions for the high-temperature calcination include: a heating rate of 5 °C / min, a holding temperature of 450 °C, and a holding time of 3 h.

[0064] Example 4

[0065] This example provides a nano carbonyl sulfide hydrolysis catalyst support. The catalyst support uses the triblock copolymer P123 and SBA-15 as template agents, aluminum chloride hexahydrate as the support precursor, titanium dioxide and sodium metaaluminate as doping elements and regulators, and the nano chemical synthesis method is used to prepare the catalyst support, including the following steps:

[0066] S1. First, dissolve 0.3 mol of aluminum chloride hexahydrate and 0.25 mol of titanium dioxide in 1 L of ultrapure water, denoted as solution A; dissolve 0.4 mol of sodium metaaluminate in 1 L of ultrapure water, denoted as solution B; dissolve 0.13 mol of P123 and 0.05 mol of SBA-15 in 1 L of ultrapure water to form a composite template agent solution.

[0067] S2. At room temperature, slowly add solution B to solution A and stop when the pH value reaches 10.0, and stir for 2 hours to obtain a white precipitate.

[0068] S3. Then mix the white precipitate obtained in S2 with the composite template agent solution and mechanically stir for 3 hours. Place the mixed solution in an oven and dry it at 100 °C for 4 hours to obtain a composite.

[0069] S4. Put the dried composite into a high-temperature muffle furnace for isothermal calcination. The conditions for isothermal calcination are: heat up to 600 °C at a heating rate of 20 °C / min and isothermally calcine for 4 hours to obtain mesoporous γ-Al₂O₃.

[0070] S5. Granulate the mesoporous γ-Al₂O₃ with a granule size of 0.5 - 0.7 mm. After high-temperature calcination again, the nano carbonyl sulfide hydrolysis catalyst support is obtained. The treatment conditions for the high-temperature calcination include: a heating rate of 5 °C / min, a holding temperature of 450 °C, and a holding time of 3 h.

[0071] Example 5

[0072] This example further prepares a nano carbonyl sulfide hydrolysis catalyst based on the supports described in Examples 1 - 4. The specific method is: immerse the supports described in Examples 1 - 4 in a 10% potassium carbonate solution for 4 h, then dry at 150 °C for 5 h, and then calcine at 550 °C for 4 h to obtain four catalyst samples with supported carriers.

[0073] To compare the performance of different catalysts, the specific surface area and COS catalytic efficiency of each catalyst product were measured respectively.

[0074] The test results and analysis are as follows:

[0075] Table 1 Specific surface area and catalytic efficiency of catalysts prepared from carriers in Examples 1-4

[0076] Project Example 1 Example 2 Example 3 Example 4 <![CDATA[Specific surface area (m 2 / g)]]> 330.3 342.4 356.7 354.6 COS catalytic efficiency 90.6％ 92.3％ 95.6％ 95.1％

[0077] As shown in the test results in Table 1, the hydrolysis conversion efficiency of the four catalyst samples is: Example 3 > Example 4 > Example 2 > Example 1, among which the conditions of Example 3 are the optimal.

[0078] In addition, through comparison, it is found that the catalysts prepared using the carriers of the above examples all have higher catalytic efficiency than the commercially available similar catalysts (as shown in Table 2), proving that the technical solution of the present invention can be popularized and applied.

[0079] Table 2 Specific surface area and catalytic efficiency of commercially available catalysts

[0080] Commercially available catalyst No. 1 No. 2 No. 3 No. 4 COS catalytic efficiency 85.3％ 81.2％ 87.4％ 82.2％

[0081] Comparative example

[0082] In this comparative example, P123 was used as the template agent, and aluminum chloride hexahydrate and sodium meta-aluminate were used as the carrier precursors. The catalyst carrier was prepared by the sol-gel method. The specific steps are as follows:

[0083] S1. Prepare 1 L of a sodium meta-aluminate solution with a concentration of 0.2 mol / L, and add 0.01 moL of the P123 template agent.

[0084] S2. Prepare 1 L of an aluminum chloride hexahydrate solution with a concentration of 0.2 mol / L, and stir until completely dissolved.

[0085] S3. Mix the solution of S1 and the solution of S2 in a molar ratio of 1:1, and stir evenly.

[0086] S4. Add an appropriate amount of hydrochloric acid solution to adjust the pH value to 2-3, and continue stirring.

[0087] S5. Age the mixed solution at room temperature for 24 hours, filter out the sol, and wash it clean with deionized water. Dry the filtered sol at 60 °C for 12 hours.

[0088] S6. Calcinate the dried solid at 550 °C for 6 hours to obtain the catalyst carrier.

[0089] The specific surface area and pore size distribution were measured by the nitrogen adsorption-desorption method. The specific surface area of the catalyst carrier prepared by the general method is about 220-280 m 2 / g.

[0090] Finally, it should be noted that the above is only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred arrangement, those of ordinary skill in the art should understand that the technical solution of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A preparation method of a carrier for a nano carbonyl sulfide hydrolysis catalyst, characterized in that, The catalyst support uses the triblock copolymer P123 and SBA-15 as template agents, aluminum chloride hexahydrate as the support precursor, and titanium dioxide and sodium aluminate as doping elements and regulators; the catalyst support is prepared by a nano-chemical synthesis method, including the following steps: S1. First, dissolve aluminum chloride hexahydrate and titanium dioxide in ultrapure water, denoted as solution A; dissolve sodium aluminate in ultrapure water, denoted as solution B; dissolve P123 and SBA-15 in ultrapure water to form a composite template agent solution; S2. At room temperature, slowly add solution B to solution A, stop when the pH value reaches a certain value, and stir for a period of time to obtain a white precipitate; S3. Then mix the white precipitate obtained in S2 with the composite template agent solution and mechanically stir for a period of time, and the mixture is dried to obtain a composite; S4. The dried composite is calcined at a constant temperature to obtain mesoporous γ-Al2O3; S5. Granulate the mesoporous γ-Al2O3, and after high-temperature calcination again, the nano-carbonyl sulfide hydrolysis catalyst support is obtained.

2. The preparation method according to claim 1, characterized in that, The mass ratio of P123 to SBA-15 in the template agent is 1:0.5 - 2; the mass ratio of the support precursor to the template agent is 5 - 10:1; the mass ratio of titanium dioxide to the template agent is 0.5 - 2:1; the mass ratio of sodium aluminate to the template agent is 0.1 - 1:

1.

3. The preparation method according to claim 1, characterized in that, In S2, solution B is slowly added to solution A, and stop when the pH value reaches 9.0 - 11.0, and the stirring time is 1 - 3 hours.

4. The preparation method according to claim 1, characterized in that, In S3, the white precipitate and the composite template agent solution are stirred for 2 - 4 hours, the drying temperature is 80 - 120 °C, and the drying time is 3 - 5 h.

5. The preparation method according to claim 1, characterized in that, In S4, the treatment conditions for the constant-temperature calcination include: the heating rate is 5 - 20 °C / min, heat up to 450 - 650 °C, and calcine at a constant temperature for 3 - 6 hours.

6. The preparation method according to claim 1, wherein, In S5, the particle size of granulation is 0.5 - 0.7 mm, and the treatment conditions for high-temperature calcination include: the heating rate is 3 - 10 °C / min, the holding temperature is 400 - 600 °C, and the holding time is 2 - 5 h.

7. The nano carbonyl sulfide hydrolysis catalyst support prepared by the method according to any one of claims 1 to 6, characterized in that, The specific surface area of the catalyst carrier is 340 - 380 m 2 / g.

8. A nano carbonyl sulfide hydrolysis catalyst prepared based on the carrier described in claim 7, characterized in that, The carrier described in claim 7 is impregnated in a potassium carbonate solution of 3-12% for 4-8 h, then dried at 120-160 °C for 4-6 h, and then calcined at 500-600 °C for 3-6 h to obtain the nano carbonyl sulfide hydrolysis catalyst, and the specific surface area of the catalyst is 320-360 m 2 / g.

9. The nano carbonyl sulfide hydrolysis catalyst according to claim 8, characterized in that, The conversion efficiency of COS in blast furnace gas using the catalyst is higher than 90% under the conditions of 110 °C and a volumetric space velocity of 1500 - 6000 h -1 .

10. The use of the method according to any one of claims 1 to 6, or the nano-carbonyl sulfide hydrolysis catalyst support according to claim 7, or the nano-carbonyl sulfide hydrolysis catalyst according to claim 8 or 9 in the removal of carbonyl sulfide.