A nano-carbonyl sulfur hydrolysis catalyst carrier, a preparation method and application thereof

Abstract

This invention provides a nano-carbonyl sulfur hydrolysis catalyst support, its preparation method, and its application. The catalyst support uses triblock copolymers P123 and SBA-15 as template agents, aluminum chloride hexahydrate as a precursor, and titanium dioxide and sodium aluminate as dopants and modifiers. The catalyst support prepared by nano-chemical synthesis has a specific surface area of ​​340-380 m². 2 / g. This invention significantly increases the specific surface area of ​​the catalyst support through an innovative preparation process, 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.

Description

Technical Field

[0001] This invention belongs to the field of catalyst technology, and specifically relates to a nano-carbonyl sulfur hydrolysis catalyst support, its preparation method, and its application. Background Technology

[0002] In the production processes of industries such as steelmaking, coking, petrochemicals, and chemicals, coal gas often contains sulfides in the form of carbonyl sulfide (COS). These sulfides, upon combustion, are converted into substances such as SO2 and SO3 and emitted into the atmosphere, becoming major air pollutants and seriously threatening the ecological environment and human health. Therefore, effectively removing carbonyl sulfide from coal gas is urgently needed.

[0003] Among the many methods for removing carbonyl sulfides, hydrolysis has attracted much attention due to its practicality. Through hydrolysis, carbonyl sulfides can be converted into more easily processed 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. The support is often γ-Al₂O₃, while the active component is generally an alkali metal or alkaline earth element. The catalyst support needs to have a large specific surface area to provide sufficient reaction area, thereby achieving high catalytic efficiency. Therefore, increasing the specific surface area of ​​the support is a reliable way to enhance the catalytic performance of the catalyst.

[0004] To overcome this challenge, researchers in related fields have conducted extensive studies and achieved certain results. For example, CN106861665B discloses an alumina carbonyl sulfur hydrolysis catalyst and its preparation method. This method uses polystyrene microspheres as macroporous templates, P123 as mesoporous template agents, soluble aluminum salts as catalyst support precursors, and potassium oxalate coordination solution as active component precursors. By utilizing size-controllable organic microspheres to construct macroporous templates and controlling mesoporous structures with mesoporous template agents, a γ-Al2O3-based COS hydrolysis catalyst with a hierarchical pore structure of macropores, mesopores, and micropores was successfully prepared, increasing the pore capacity to some extent. However, its specific surface area still did not reach the ideal state, limiting further improvement in catalytic efficiency.

[0005] For example, CN 116020434B discloses a carbonyl sulfur hydrolysis catalyst that does not accumulate sulfur and is resistant to deactivation. This catalyst uses polystyrene microspheres as a hard template and a triblock copolymer as a soft template, employing a solvent evaporation-induced self-assembly-assisted hydrothermal synthesis method to prepare a MgAl2O4 catalyst with a high specific surface area and a three-dimensional ordered macroporous-mesoporous structure. However, this patent unfortunately does not disclose key information such as its specific surface area, leading to uncertainties in the practical application and further optimization of this technology. Furthermore, because this method requires a hard template and solvent evaporation, the preparation cost is high and the pollution is significant, making it unsuitable for widespread application.

[0006] In summary, existing carbonyl sulfur hydrolysis catalysts still have room for improvement in terms of specific surface area and related properties. Developing a nano-carbonyl sulfur hydrolysis catalyst with higher specific surface area and better catalytic efficiency, along with its preparation method, is of significant practical importance for promoting green development in related industries and reducing environmental pollution. Summary of the Invention

[0007] To overcome the problems of low hydrolysis conversion rate and short service life of existing COS hydrolysis catalysts, the present invention aims to provide a nano-carbonyl sulfur hydrolysis catalyst support, its preparation method and application. Through innovative preparation process, the specific surface area of ​​the catalyst support is significantly improved, thereby enhancing 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 objective of this invention is achieved through the following technical solution:

[0009] The first aspect of this invention provides a method for preparing a nano-carbonyl sulfur hydrolysis catalyst support. The catalyst support uses triblock copolymers P123 and SBA-15 as template agents, aluminum chloride hexahydrate as a precursor, and titanium dioxide and sodium aluminate as dopants and modifiers. The catalyst support is prepared using a nano-chemical synthesis method, comprising the following steps:

[0010] S1. First, dissolve aluminum chloride hexahydrate and titanium dioxide in ultrapure water, and denote it as solution A; dissolve sodium aluminate in ultrapure water, and denote it 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 until the pH value reaches a certain value, then stop stirring for a period of time to obtain a white precipitate;

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

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

[0014] S5. The mesoporous γ-Al2O3 is granulated and then calcined at high temperature again to obtain the nano carbonyl sulfur hydrolysis catalyst support.

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

[0016] Furthermore, 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] Furthermore, in step S2, solution B is slowly added to solution A until the pH value reaches 9.0-11.0, and then the stirring time is 1-3 hours.

[0018] Furthermore, in step S3, the white precipitate is stirred with the composite template agent solution for 2-4 hours, and the drying temperature is 80-120℃ for 3-5 hours.

[0019] Furthermore, in step S4, the constant-temperature calcination conditions include: a heating rate of 5-20℃ / min, heating to 450-650℃, and constant-temperature calcination for 3-6 hours.

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

[0021] A second aspect of the present invention provides a nano-carbonyl sulfur hydrolysis catalyst support prepared by the method described in the first aspect, wherein the catalyst support has a specific surface area of ​​340-380 m². 2 / g.

[0022] A third aspect of this invention provides a nano-carbonyl sulfur hydrolysis catalyst, prepared based on the support described in the second aspect. The support is impregnated in a 3-12% potassium carbonate solution for 4-8 hours, then dried at 120-160°C for 4-6 hours, and subsequently calcined at 500-600°C for 3-6 hours to obtain the nano-carbonyl sulfur hydrolysis catalyst. The catalyst has a specific surface area of ​​320-360 m². 2 / g. In some specific embodiments, the support was impregnated in a 10% potassium carbonate solution for 4 hours, then dried at 150°C for 5 hours, and subsequently calcined at 550°C for 4 hours to obtain the catalyst with a specific surface area of ​​356.7 m². 2 / g.

[0023] Furthermore, the catalyst achieves a COS conversion efficiency in blast furnace gas at 110°C and a volume hourly space velocity (VHSV) of 1500-6000 h⁻¹. -1 Under these conditions, the hydrolysis conversion rate of carbonyl sulfide is higher than 90%.

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

[0025] The advantages of this invention compared to the prior art are as follows:

[0026] 1. Significantly Improved COS Conversion Efficiency: This application utilizes a composite template agent formed by triblock copolymer P123 and SBA-15, and employs a nano-chemical synthesis method to prepare the catalyst support, significantly increasing the specific surface area of ​​the catalyst support while ensuring a more uniform pore structure. This improvement enables the catalyst to act more effectively on COS in blast furnace gas, significantly improving the COS conversion efficiency. Compared to the approximately 80% hydrolysis conversion rate of existing COS hydrolysis catalysts, the catalyst of this invention achieves a higher conversion rate, thereby treating COS in blast furnace gas more efficiently.

[0027] 2. Extending the service life of hydrolysis catalysts: The catalyst support obtained based on the unique preparation method described above helps to extend the service life of hydrolysis catalysts. The problem of short service life of existing catalysts 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 related production processes.

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

[0029] 4. Precise and Controllable Reaction Process and Product Structure: During the preparation process, the reaction process can be precisely controlled by flexibly adjusting the ratios of aluminum chloride hexahydrate, titanium dioxide, sodium aluminate, and template agent, as well as the reaction temperature and time. Specifically, the addition of titanium dioxide significantly improves the activity and stability of the catalyst; sodium aluminate regulates the chemical composition and physical properties of the catalyst. For example, increasing the proportion of sodium aluminate increases the basicity of the catalyst, thereby improving the hydrolysis performance of carbonyl sulfide. This precise control enables the regulation of the structure and particle size of the final nano-alumina support, allowing for the customization of catalyst supports with specific properties according to different practical application requirements, thus enhancing the adaptability and flexibility of this invention in practical applications.

[0030] 5. Promoting Green Development and Reducing Environmental Pollution in the Industry: By efficiently converting COS in blast furnace gas, COS emissions are reduced, minimizing environmental pollution. Simultaneously, the extended catalyst lifespan reduces waste generated from frequent catalyst replacements. This invention promotes green development in related industries from multiple perspectives and plays a positive role in environmental protection. Detailed Implementation

[0031] The embodiments described are provided to better illustrate the present invention, but are not intended to limit the scope of the invention to the embodiments described. Therefore, non-essential improvements and adjustments made to the embodiments by those skilled in the art based on the above description are still within the scope of protection of the present invention.

[0032] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

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

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

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

[0036] The hydrolytic conversion efficiency of the catalyst for COS was determined by gas chromatography under the following conditions:

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

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

[0039] Catalyst: 100 grams;

[0040] Reactor temperature: 120℃;

[0041] Airspeed: 6000 h -1 .

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

[0043] Example 1

[0044] This embodiment provides a nano-carbonyl sulfur hydrolysis catalyst support. The catalyst support uses triblock copolymers P123 and SBA-15 as template agents, aluminum chloride hexahydrate as a precursor, and titanium dioxide and sodium aluminate as dopants and modifiers. The catalyst support is prepared using a nano-chemical synthesis method, including the following steps:

[0045] S1. First, dissolve 0.2 mol aluminum chloride hexahydrate and 0.2 mol titanium dioxide in 1 L of ultrapure water, and denote this as solution A; dissolve 0.6 mol sodium aluminate in 1 L of ultrapure water, and denote this as solution B; dissolve 0.1 mol P123 and 0.05 mol 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 until the pH reaches 9.0, then stop stirring for 2 hours to obtain a white precipitate.

[0047] S3. The white precipitate obtained in S2 is then mixed with the composite template agent solution and mechanically stirred for 2 hours. The mixture is then placed in a drying oven and dried at 100°C for 4 hours to obtain the composite.

[0048] S4. The dried composite was placed in a high-temperature muffle furnace for isothermal calcination. The isothermal calcination conditions were: heating to 600℃ at a heating rate of 20℃ / min and calcining at the same temperature for 4 hours to obtain mesoporous γ-Al2O3.

[0049] S5. The mesoporous γ-Al2O3 is granulated to a particle size of 0.5-0.7 mm, and then calcined at high temperature again to obtain the nano-carbonyl sulfur hydrolysis catalyst support. The high-temperature calcination conditions include: a heating rate of 5℃ / min, a holding temperature of 450℃, and a holding time of 3 h.

[0050] Example 2

[0051] This embodiment provides a nano-carbonyl sulfur hydrolysis catalyst support. The catalyst support uses triblock copolymers P123 and SBA-15 as template agents, aluminum chloride hexahydrate as a precursor, and titanium dioxide and sodium aluminate as dopants and modifiers. The catalyst support is prepared using a nano-chemical synthesis method, including the following steps:

[0052] S1. First, dissolve 0.25 mol aluminum chloride hexahydrate and 0.25 mol titanium dioxide in 1 L of ultrapure water, and denote this as solution A; dissolve 0.5 mol sodium aluminate in 1 L of ultrapure water, and denote this as solution B; dissolve 0.15 mol P123 and 0.05 mol 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 until the pH reaches 9.0, then stop stirring for 2 hours to obtain a white precipitate.

[0054] S3. The white precipitate obtained in S2 is then mixed with the composite template agent solution and mechanically stirred for 2 hours. The mixture is then placed in a drying oven and dried at 100°C for 4 hours to obtain the composite.

[0055] S4. The dried composite was placed in a high-temperature muffle furnace for isothermal calcination. The isothermal calcination conditions were: heating to 600℃ at a heating rate of 20℃ / min and calcining at the same temperature for 4 hours to obtain mesoporous γ-Al2O3.

[0056] S5. The mesoporous γ-Al2O3 is granulated to a particle size of 0.5-0.7 mm, and then calcined at high temperature again to obtain the nano-carbonyl sulfur hydrolysis catalyst support. The high-temperature calcination conditions include: a heating rate of 5℃ / min, a holding temperature of 450℃, and a holding time of 3 h.

[0057] Example 3

[0058] This embodiment provides a nano-carbonyl sulfur hydrolysis catalyst support. The catalyst support uses triblock copolymers P123 and SBA-15 as template agents, aluminum chloride hexahydrate as a precursor, and titanium dioxide and sodium aluminate as dopants and modifiers. The catalyst support is prepared using a nano-chemical synthesis method, including the following steps:

[0059] S1. First, dissolve 0.4 mol aluminum chloride hexahydrate and 0.25 mol titanium dioxide in 1 L of ultrapure water, and denote this as solution A; dissolve 0.4 mol sodium aluminate in 1 L of ultrapure water, and denote this as solution B; dissolve 0.15 mol P123 and 0.05 mol 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 until the pH reaches 10.0, then stop stirring for 2 hours to obtain a white precipitate.

[0061] S3. The white precipitate obtained in S2 is then mixed with the composite template agent solution and mechanically stirred for 3 hours. The mixture is then placed in a drying oven and dried at 100°C for 4 hours to obtain the composite.

[0062] S4. The dried composite was placed in a high-temperature muffle furnace for isothermal calcination. The isothermal calcination conditions were: heating to 600℃ at a heating rate of 20℃ / min and calcining at the same temperature for 4 hours to obtain mesoporous γ-Al2O3.

[0063] S5. The mesoporous γ-Al2O3 is granulated to a particle size of 0.5-0.7 mm, and then calcined at high temperature again to obtain the nano-carbonyl sulfur hydrolysis catalyst support. The high-temperature calcination conditions include: a heating rate of 5℃ / min, a holding temperature of 450℃, and a holding time of 3 h.

[0064] Example 4

[0065] This embodiment provides a nano-carbonyl sulfur hydrolysis catalyst support. The catalyst support uses triblock copolymers P123 and SBA-15 as template agents, aluminum chloride hexahydrate as a precursor, and titanium dioxide and sodium aluminate as dopants and modifiers. The catalyst support is prepared using a nano-chemical synthesis method, including the following steps:

[0066] S1. First, dissolve 0.3 mol aluminum chloride hexahydrate and 0.25 mol titanium dioxide in 1 L of ultrapure water, and denote this as solution A; dissolve 0.4 mol sodium aluminate in 1 L of ultrapure water, and denote this as solution B; dissolve 0.13 mol P123 and 0.05 mol 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 until the pH reaches 10.0, then stop stirring for 2 hours to obtain a white precipitate.

[0068] S3. The white precipitate obtained in S2 is then mixed with the composite template agent solution and mechanically stirred for 3 hours. The mixture is then placed in a drying oven and dried at 100°C for 4 hours to obtain the composite.

[0069] S4. The dried composite was placed in a high-temperature muffle furnace for isothermal calcination. The isothermal calcination conditions were: heating to 600℃ at a heating rate of 20℃ / min and calcining at the same temperature for 4 hours to obtain mesoporous γ-Al2O3.

[0070] S5. The mesoporous γ-Al2O3 is granulated to a particle size of 0.5-0.7 mm, and then calcined at high temperature again to obtain the nano-carbonyl sulfur hydrolysis catalyst support. The high-temperature calcination conditions include: a heating rate of 5℃ / min, a holding temperature of 450℃, and a holding time of 3 h.

[0071] Example 5

[0072] This embodiment further prepares nano-carbonyl sulfur hydrolysis catalysts based on the supports described in Examples 1 to 4. The specific method is as follows: the supports described in Examples 1 to 4 are respectively immersed in a 10% potassium carbonate solution for 4 hours, then dried at 150°C for 5 hours, and then calcined at 550°C for 4 hours to obtain catalyst samples with four supported supports.

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

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

[0075] Table 1. Specific surface area and catalytic efficiency of catalysts prepared from supports 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 Catalytic COS efficiency 90.6％ 92.3％ 95.6％ 95.1％

[0077] As shown in Table 1, the hydrolysis conversion efficiency of the four catalyst samples is as follows: Example 3 > Example 4 > Example 2 > Example 1, with the conditions of Example 3 being the optimal.

[0078] Furthermore, through comparison, it was found that the catalysts prepared using the supports in the above embodiments all have higher catalytic efficiency than existing commercially available similar catalysts (as shown in Table 2), proving that the technical solution of the present invention can be widely applied.

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

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

[0081] Comparative Example

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

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

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

[0085] S3. Mix solution S1 and solution S2 in a 1:1 molar ratio and stir until homogeneous.

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

[0087] S5. Aged the mixed solution at room temperature for 24 hours, filtered out the sol, and washed with deionized water. The filtered sol was dried at 60°C for 12 hours.

[0088] S6. The dried solid was calcined at 550°C for 6 hours to obtain the catalyst support.

[0089] Specific surface area and pore size distribution were determined using a nitrogen adsorption-desorption method. The specific surface area of ​​catalyst supports prepared by conventional methods is approximately 220-280 m². 2 / g.

[0090] Finally, it should be noted that the above description is only used to illustrate the technical solutions of the present invention and is not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention.

Claims

1. A method for preparing a nano-carbonyl sulfur hydrolysis catalyst support, characterized in that, The catalyst support uses triblock copolymers P123 and SBA-15 as template agents, aluminum chloride hexahydrate as a precursor, and titanium dioxide and sodium aluminate as dopants and modifiers. The catalyst support is prepared using a nanochemical synthesis method, comprising the following steps: S1. First, dissolve aluminum chloride hexahydrate and titanium dioxide in ultrapure water, and denote it as solution A; dissolve sodium aluminate in ultrapure water, and denote it as solution B; dissolve P123 and SBA-15 in ultrapure water to form a composite template agent solution; 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; and the mass ratio of sodium aluminate to the template agent is 0.1~1:

1. S2. At room temperature, slowly add solution B to solution A until the pH reaches 9.0-11.0, then stop stirring for 1-3 hours to obtain a white precipitate; S3. The white precipitate obtained in S2 is then mixed with the composite template agent solution and mechanically stirred for 2-4 hours. The mixture is then dried to obtain the composite. The drying temperature is 80-120℃ and the drying time is 3-5 hours. S4. The dried composite was calcined at a constant temperature to obtain mesoporous material. The constant-temperature calcination conditions include: a heating rate of 5-20 ℃ / min, heating to 450-650 ℃, and constant-temperature calcination for 3-6 hours. S5. Mesopores The nano-carbonyl sulfur hydrolysis catalyst support is obtained by granulation and high-temperature calcination. The particle size of the granulation is 0.5-0.7 mm, and the high-temperature calcination conditions include: heating rate of 3-10 ℃ / min, holding temperature of 400-600 ℃, and holding time of 2-5 h.

2. The nano-carbonyl sulfur hydrolysis catalyst support prepared by the method of claim 1, characterized in that, The specific surface area of ​​the catalyst support is 340-380. .

3. A nano-carbonyl sulfur hydrolysis catalyst, prepared based on the support described in claim 2, characterized in that, The nano-carbonyl sulfur hydrolysis catalyst is prepared by impregnating the support described in claim 2 in a 3-12% potassium carbonate solution for 4-8 h, drying it at 120-160 °C for 4-6 h, and then calcining it at 500-600 °C for 3-6 h. The specific surface area of ​​the catalyst is 320-360 nm. .

4. The nano-carbonyl sulfur hydrolysis catalyst according to claim 3, characterized in that, The catalyst achieves a COS conversion efficiency in blast furnace gas at 110 °C and a volume hourly space velocity (VHSV) of 1500-6000. Under these conditions, the hydrolysis conversion rate of carbonyl sulfide is higher than 90%.

5. The use of the nano-carbonyl sulfur hydrolysis catalyst support as described in claim 2, or the nano-carbonyl sulfur hydrolysis catalyst as described in claim 3 or 4, in the removal of carbonyl sulfur.