A catalyst for hydrolysis of carbonyl sulphur, its preparation and use

Abstract

This invention relates to the field of carbonyl sulfide removal technology in blast furnace gas, specifically disclosing a carbonyl sulfide hydrolysis catalyst, its preparation method, and its application. Based on the synthesis principle of strontium titanate, doped titanium-rich strontium titanate powder is prepared using a hydrothermal method. The strontium titanate is then modified at the B-site with rare earth metal La to obtain a La-STO@T catalyst capable of photothermal synergistic hydrolysis of carbonyl sulfide at 40–80℃. This invention employs a photocatalytic combined with thermocatalytic synergistic technology to catalyze the hydrolysis removal of COS, enabling the La-STO@T catalyst to achieve highly efficient COS hydrolysis performance at low temperatures. This significantly optimizes the effect of using thermocatalytic hydrolysis technology alone, solving problems such as relatively high hydrolysis temperature and high energy consumption required for heating the reaction system. It has broad application prospects in the efficient removal of carbonyl sulfide.

Description

Technical Field

[0001] This invention relates to the field of carbonyl sulfur removal technology in blast furnace gas, and more specifically to a low-temperature, poison-resistant carbonyl sulfur hydrolysis catalyst, its preparation method, and its application. Background Technology

[0002] Byproduct gases from steel mills, including blast furnace gas and coke oven gas, are important secondary energy sources. They can be purified to provide calorific value for fuel and are used in chemical production. Blast furnace gas mainly consists of CO2 (18-22%), CO (20-25%), N2 (50-55%), H2 (1-4%), and O2 (0-0.8%). Sulfides, including organic and inorganic sulfur compounds, are significant pollutants in blast furnace gas. Carbonyl sulfide (COS) is the main pollutant in blast furnace gas, accounting for over 90% of the total organic sulfur content, while inorganic sulfur is primarily hydrogen sulfide (H2S).

[0003] COS and H2S are highly toxic and corrosive. Even trace amounts of COS can harm human health when blast furnace gas is reused as a secondary energy source. In industry, COS causes equipment corrosion and catalyst deactivation. Furthermore, various sulfur-containing substances can release SO2. x The emission of COS into the atmosphere causes air pollution, which greatly limits the clean and efficient utilization of blast furnace gas. At the same time, because COS is chemically stable, it cannot be removed by simple absorption or adsorption. Therefore, the main difficulty in desulfurizing blast furnace gas lies in the removal of COS.

[0004] Currently, common COS removal methods include adsorption, hydrogenation conversion, catalytic hydrolysis, and oxidation. Among these, hydrogenation conversion and catalytic hydrolysis have been extensively studied. As a removal method, adsorption only transfers COS to the adsorbent and does not actually remove it. Although hydrogenation does not require an external hydrogen source, it typically only exhibits high reactivity and conversion rates at relatively high reaction temperatures (280-400℃) and pressures (3.5-4.0 MPa), thus limiting its application. Catalytic hydrolysis converts COS into purified H2S, which is then efficiently removed. Due to its high conversion rate, low reaction temperature, lack of hydrogen source consumption, and mature purification process for its hydrolysis product H2S, which allows for sulfur resource recovery, catalytic hydrolysis is considered a promising technology for COS removal from industrial gases. However, the chemically stable C=O and C=S double bonds and the use of single thermocatalytic hydrolysis to remove COS will create bottlenecks, such as the deactivation of hydrolysis catalyst due to sulfur deposition, low energy efficiency, relatively high hydrolysis temperature, and large energy consumption required to raise the temperature of the reaction system. These problems pose challenges to steel companies (Wang Xindong et al., Research progress on desulfurization technology of blast furnace gas [J]. Journal of Process Engineering, 2023, 23(07):1003-1012.).

[0005] Therefore, it is crucial to explore a low-temperature, high-efficiency technology for treating COS while reducing energy consumption. In recent years, photothermal synergistic catalysis has received widespread attention. This technology utilizes ultraviolet light to excite electron-hole pairs on photoluminescent materials, thereby enhancing the catalytic activity of the support. Compared with traditional single thermal and photocatalysis, the synergistic effect of photo-reaction and thermal reaction can achieve higher catalytic activity. Currently, research on photothermal synergistic catalysis in the field of waste gas treatment mainly focuses on Hg in smelting flue gas. 0 In terms of hydrogen and other aspects.

[0006] Therefore, introducing photothermal synergy into the low-temperature COS removal of blast furnace gas is a promising alternative to traditional thermocatalytic hydrolysis. Photothermal synergistic hydrolysis for COS removal provides initial motive force for the catalytic reaction through catalyst photoexcitation and low-temperature heating, thus ensuring better hydrolysis efficiency than photocatalysis or thermocatalysis alone. It also solves the problems of relatively high hydrolysis temperatures and high energy consumption required to raise the temperature of the reaction system when using single thermocatalytic hydrolysis desulfurization technology to treat gaseous carbonyl sulfur.

[0007] In summary, developing a low-temperature, poison-resistant carbonyl sulfur hydrolysis catalyst is of significant scientific and economic value for the efficient removal of COS from blast furnace gas. Photothermal synergistic catalytic hydrolysis of COS is a promising method. Summary of the Invention

[0008] In view of this, the present invention provides a low-temperature, poison-resistant carbonyl sulfur hydrolysis catalyst, its preparation method, and its application. This catalyst can be used for the low-temperature catalytic hydrolysis removal of carbonyl sulfur from blast furnace gas, effectively solving the problems of relatively high hydrolysis temperature and large energy consumption required for heating the reaction system that occur in current single thermocatalytic hydrolysis removal of carbonyl sulfur.

[0009] To achieve the above objectives, this invention provides a low-temperature, poison-resistant carbonyl sulfur hydrolysis catalyst. Based on the synthesis principle of strontium titanate, a doped titanium-rich strontium titanate powder is prepared by hydrothermal method, and the strontium titanate is modified at the B site with rare earth metal La to obtain a La-STO@T catalyst that catalyzes the hydrolysis of carbonyl sulfur at 40-80℃ through photothermal synergy.

[0010] The beneficial effects achieved by adopting the above scheme are as follows: the La-STO@T catalyst of the present invention exhibits obvious photocatalytic activity and stability in the range of 40 to 80°C, while the reaction temperature of traditional single thermocatalytic hydrolysis of carbonyl sulfide usually needs to be between 120 and 220°C to achieve a high hydrolysis conversion rate.

[0011] Furthermore, to achieve the above objectives, the present invention provides a method for preparing a low-temperature, poison-resistant carbonyl sulfur hydrolysis catalyst, the specific steps of which are as follows:

[0012] Step 1): Add Sr(NO3)2 and TiO2 to a certain amount of deionized water, stir at a constant speed until fully mixed and dissolved, then add La(NO3)3·6H2O according to the loading ratio and stir evenly. Finally, add an appropriate amount of mineralizer to obtain a mixed suspension.

[0013] Step 2): The mixed suspension was stirred for 1 hour at room temperature and pressure, then sealed and heated in an oven at 200°C for 24 hours to obtain a solid precipitate;

[0014] Step 3): After the reaction vessel has cooled to room temperature, pour out the supernatant and leave the solid precipitate. Wash the solid precipitate by centrifugation multiple times with acetic acid solution (2% by mass) and deionized water to remove excess alkaline substances and metal salt ions, and obtain the precipitate.

[0015] Step 4): Dry the precipitate obtained in Step 3), grind it into powder, and calcine it to obtain solid doped strontium titanate powder.

[0016] Preferably, the molar ratio of Sr:Ti and Sr:Ti in Sr(NO3)2 and TiO2 in step 1) is 1:1.

[0017] Preferably, the solid-liquid ratio of Sr(NO3)2 and TiO2 to deionized water in step 1) is 0.1 g / mL.

[0018] Preferably, the load ratios in step 1) are 3wt% to 13wt%.

[0019] More preferably, the loading ratios in step 1) are 3wt%, 5wt%, 10wt%, and 13wt%, respectively.

[0020] Preferably, the loading ratio is based on the molar ratio of La to TiO2, with the aim of doping La into the B site of the STO@T catalyst to form a La / Ti lanthanum-titanium composite.

[0021] When the loading ratio is 10wt%, the molar ratio of La(NO3)3·6H2O to TiO2 is 1:9.

[0022] Preferably, the mineralizing agent in step 1) is one of NaOH, KOH, Na2CO3, and K2CO3; the solid-liquid ratio of the mineralizing agent to deionized water is 0.02 g / mL.

[0023] Preferably, the stirring speed in step 1) is 70 r / min, and the time is 5 to 10 min.

[0024] Preferably, the heating rate of the calcination in step 4) is 5℃ / min, the temperature is raised to 400~800℃, and the calcination time is 4h.

[0025] Furthermore, to achieve the above objectives, the present invention provides an application of a low-temperature, poison-resistant carbonyl sulfur hydrolysis catalyst, characterized in that the carbonyl sulfur hydrolysis catalyst is used in the photothermal synergistic catalytic hydrolysis of carbonyl sulfur in blast furnace gas purification.

[0026] As can be seen from the above technical solution, compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The hydrolysis catalyst of this invention is based on the synthesis principle of strontium titanate. Doped strontium titanate powder is prepared by hydrothermal method, and then modified with rare earth metal La to obtain La-STO@T catalyst. The 10% La-STO@T lanthanum-doped strontium titanate catalyst with a doping ratio of 10% achieves a COS removal rate of about 60% by thermal catalytic (T) hydrolysis at a reaction temperature of 60°C. The photothermal synergistic (PT) hydrolysis effect can achieve complete COS removal, and the selectivity of product H2S is also maintained above 99%.

[0028] (2) Based on the thermal catalytic hydrolysis of carbonyl sulfide, this invention is the first to use photothermal synergistic technology to catalyze the hydrolysis of COS. Combined with a La-STO@T doped strontium titanate catalyst, high selectivity of products is achieved at low reaction temperature. At the same hydrolysis temperature, the efficiency of photothermal synergistic removal of COS is significantly improved. It can effectively solve the problems of relatively high hydrolysis temperature and large energy consumption required for heating the reaction system when removing carbonyl sulfide by single thermal catalytic hydrolysis.

[0029] (3) The La-STO@T catalyst doped with La nanoparticles of the present invention exhibits obvious photothermal catalytic activity and stability. This is because the doping of La increases the density of alkaline sites on SrTiO3@TiO2, which promotes the continuous dissociation of H2O in the system and the regeneration of -OH under UV irradiation. In addition, photoelectrons on SrTiO3@TiO2 are transferred to La, which ensures the activation of COS and photothermal hydrolysis. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 The attached diagram is a flowchart of the experiment of the photothermal synergistic device.

[0032] Figure 2 The attached figure shows the COS removal rate of x% La-STO@T catalyst samples with different doping ratios (3%, 5%, 10%, 13%).

[0033] Figure 3 The attached figure shows the effect of different calcination temperatures on COS removal rate.

[0034] Figure 4 The attached figure shows the hydrolysis activity of the 10% La-STO@T sample at different temperatures during photothermal (PT) and thermal (T) processes.

[0035] Figure 5 The attached figure shows the on / off lamp test diagram of a 10% La-STO@T catalyst sample.

[0036] Figure 6 The attached figure shows the XRD pattern of x% La-STO@T catalyst sample (where x is 3 to 13).

[0037] Figure 7 The attached figure is a flowchart illustrating the application of the catalyst of this invention in blast furnace gas purification. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0039] Experimental setup and procedure:

[0040] The photocatalytic reaction is carried out in a fixed-box continuous flow reactor, including a temperature-controlled outer chamber and a reaction inner chamber, as shown in the attached diagram. Figure 1 As shown. The temperature of the outer chamber can be controlled by an external heating jacket, and the internal temperature can be adjusted within the range of 20–100℃. The thermocatalytic experiment section can be heated by the heating jacket. The inner reaction chamber includes an external UV lamp (9W) and a U-shaped quartz reaction tube. The UV light from the UV lamp illuminates the U-shaped quartz tube, forming a beam distribution on the catalyst surface. A layer of quartz sand is fixed inside the U-shaped quartz tube, allowing only flue gas to pass through. 0.3g of catalyst is placed on a perforated plate of quartz sand for hydrolysis removal of gaseous COS. The moisture source is nitrogen gas carrying water; the water vapor content and volume fraction are controlled by adjusting the nitrogen flow rate and water temperature. The flow rate of the simulated flue gas is controlled by a mass flow controller.

[0041] Catalyst activity evaluation methods:

[0042] The catalyst activity was tested using a catalytic activity evaluation device, which consists of three parts: a gas collection system, a reaction system, and an analysis system. The photocatalytic reaction was carried out in a fixed-box continuous flow reactor, including a temperature-controlled outer chamber and a reaction inner chamber. The reaction gas was blast furnace gas from Dalian Date, with a COS concentration of 1000 ppm, pure N2 (99.99%), and a space velocity of 10000–40000 h⁻¹. -1 The activity was tested under reaction temperatures of 40–80℃. The concentrations of H2S, COS, and CO2 in the reaction products were determined using a FULI-9790Ⅱ gas chromatograph. After the reaction gas was introduced into the apparatus, the inlet concentration of COS was measured every 1 hour to ensure the stability of the entire reaction system during the experiment; while the concentration of the reaction products was measured every 10 minutes to determine the catalyst's reactivity. The specific evaluation indicators, COS removal rate and H2S selectivity, were calculated using the following formulas:

[0043]

[0044]

[0045] Where: η COSCOS and H2S removal efficiency

[0046] C COSin Inlet COS and H2S concentration; mg / m³ 3

[0047] C COSout Export COS and H2S concentrations; mg / m³ 3

[0048] C H2Sout H2S concentration at outlet; mg / m³ 3

[0049] S H2S H2S selectivity; %

[0050] Experiment 1: Optimization Experiment

[0051] (I) Optimization of the active component doping ratio of La-STO@T catalyst

[0052] The COS removal rates of La-STO@T doped strontium titanate catalysts with different doping ratios (3%, 5%, 10%, and 13%) are shown in the attached figure. Figure 2 .

[0053] Example 1

[0054] This embodiment discloses a method for preparing a low-temperature, poison-resistant carbonyl sulfur hydrolysis catalyst, the specific steps of which are as follows:

[0055] Step 1): Add a certain amount of Sr(NO3)2 and TiO2 to a beaker containing deionized water. After the suspension of Sr(NO3)2 and TiO2 is stirred at a constant speed under a magnetic stirrer until fully mixed and dissolved, add La(NO3)3·6H2O at a loading ratio of 3% and a molar ratio of 3 / 97 to TiO2 and stir evenly. Finally, add an appropriate amount of NaOH as a mineralizing agent.

[0056] in,

[0057] The molar ratio of Sr:Ti in Sr(NO3)2 and TiO2 is 1:1;

[0058] The solid-liquid ratio of Sr(NO3)2 and TiO2 to deionized water is 0.1 g / mL;

[0059] The solid-liquid ratio of NaOH to deionized water is 0.02 g / mL;

[0060] The stirring speed was 70 r / min, and the stirring time was 10 min.

[0061] Step 2): Continue mixing and stirring the mixed suspension at room temperature and pressure. After 1 hour, pour it into a 125 mL stainless steel high-pressure reactor, seal it, and heat it at 200 °C in an oven for 24 hours.

[0062] Step 3): After the reaction vessel has cooled to room temperature, pour out the supernatant, leaving the solid precipitate. Wash the solid powder repeatedly by centrifugation with acetic acid solution (2% by mass) and deionized water to remove excess alkaline substances and metal salt ions.

[0063] Step 4): The final wet solid powder is dried in an oven at 80°C for 10 hours to obtain a block solid. It is then ground into powder, and the powder is placed in a crucible and placed in a muffle furnace. The temperature is increased to 700°C at a rate of 5°C / min, and calcined for 4 hours to obtain a solid doped strontium titanate powder with a doping ratio of 3% (3% La-STO@T).

[0064] Example 2

[0065] This embodiment discloses a method for preparing a low-temperature, poison-resistant carbonyl sulfur hydrolysis catalyst, the specific steps of which are as follows:

[0066] The La-STO@T catalyst with a doping ratio of 5% was prepared using the same preparation method as in Example 1 above.

[0067] Example 3

[0068] This embodiment discloses a method for preparing a low-temperature, poison-resistant carbonyl sulfur hydrolysis catalyst, the specific steps of which are as follows:

[0069] The La-STO@T catalyst with a doping ratio of 10% was prepared using the same preparation method as in Example 1 above.

[0070] Example 4

[0071] This embodiment discloses a method for preparing a low-temperature, poison-resistant carbonyl sulfur hydrolysis catalyst, the specific steps of which are as follows:

[0072] The La-STO@T catalyst with a doping ratio of 13% was prepared using the same preparation method as in Example 1 above.

[0073] (II) Optimization of calcination temperature for La / STO@T catalyst

[0074] The COS removal rates of La-STO@T prepared at different calcination temperatures (400, 500, and 600℃) are shown in the attached graph. Figure 3 .

[0075] Example 5

[0076] This embodiment discloses a method for preparing a low-temperature, poison-resistant carbonyl sulfur hydrolysis catalyst, the specific steps of which are as follows:

[0077] A 10% La-STO@T-400℃ catalyst was prepared using the same preparation method as in Example 1 above, with an optimal doping ratio of 10% and a calcination temperature of 400℃.

[0078] Example 6

[0079] This embodiment discloses a method for preparing a low-temperature, poison-resistant carbonyl sulfur hydrolysis catalyst, the specific steps of which are as follows:

[0080] A 10% La-STO@T-500℃ catalyst was prepared using the same preparation method as in Example 1 above, with an optimal doping ratio of 10% and a calcination temperature of 500℃.

[0081] Example 7

[0082] This embodiment discloses a method for preparing a low-temperature, poison-resistant carbonyl sulfur hydrolysis catalyst, the specific steps of which are as follows:

[0083] A 10% La-STO@T-600℃ catalyst was prepared using the same preparation method as in Example 1 above, with an optimal doping ratio of 10% and a calcination temperature of 600℃.

[0084] Combined with appendix Figure 2 and attached Figure 3 The data shows that the optimal doping ratio of the active component of the La-STO@T catalyst is 10%, and the optimal calcination temperature is 500℃.

[0085] Experiment 2: Photothermal Synergistic (PT) Hydrolysis Experiment

[0086] Based on the carbonyl sulfur hydrolysis catalyst 10% La-STO@T prepared with a doping ratio of 10%, a calcination temperature of 500°C, and other conditions the same as in Example 1, the following experiments were conducted.

[0087] Example 8

[0088] COS was introduced into the reaction apparatus at an inlet concentration of 150 ppm, with N2 used as the equilibrium gas, and a water-passing device was connected to facilitate hydrolysis. The relative humidity was 48%, and the reaction space velocity was 20,000 h⁻¹. -1 The UV lamp intensity was 9W. At the same time, 0.3g of 10% La-STO@T catalyst was placed in a quartz tube and placed in a fixed box continuous flow reactor. Photothermal synergistic (PT) catalytic hydrolysis of carbonyl sulfur was carried out at a reaction temperature of 40℃.

[0089] Example 9

[0090] Under the same reaction conditions as in Example 8 above, the photothermal synergistic (PT) catalytic hydrolysis of carbonyl sulfur was carried out at a reaction temperature of 50°C.

[0091] Example 10

[0092] Under the same reaction conditions as in Example 8 above, the photothermal synergistic (PT) catalytic hydrolysis of carbonyl sulfur was carried out at a reaction temperature of 60°C.

[0093] Comparative Example 1

[0094] Under the same reaction conditions as in Example 8 above, a purely thermal catalytic (T) hydrolysis of carbonyl sulfur was carried out at a reaction temperature of 40°C.

[0095] Comparative Example 2

[0096] Under the same reaction conditions as in Example 8 above, a purely thermal catalytic (T) hydrolysis of carbonyl sulfur was carried out at a reaction temperature of 50°C.

[0097] Comparative Example 3

[0098] Under the same reaction conditions as in Example 8 above, a purely thermal catalytic (T) hydrolysis of carbonyl sulfur was carried out at a reaction temperature of 60°C.

[0099] Example 11

[0100] COS was introduced into the reaction apparatus at an inlet concentration of 150 ppm, with N2 used as the equilibrium gas, and a water-passing device was connected to facilitate hydrolysis. The relative humidity was 48%, and the reaction space velocity was 20,000 h⁻¹. -1 The UV lamp intensity was 9W, and 0.3g of 10% La-STO@T catalyst was placed in a quartz tube within a fixed-box continuous flow reactor. The COS photocatalytic conversion rate of the 10% La-STO@T catalyst sample was evaluated under two light cycles at a reaction temperature of 60℃.

[0101] Comparative Example 4

[0102] Under the same reaction conditions as in Example 10 above, the COS photocatalytic conversion rate of the undoped STO@T catalyst sample was evaluated under two light cycles.

[0103] Example 12

[0104] XRD analysis was performed on the La-STO@T catalysts prepared in Examples 1-3, and the results are shown in the appendix. Figure 6 .

[0105] The target catalyst synthesized in this invention is to dope the active component La into the B site of STO@T strontium titanate, thereby forming a La / Ti complex, which provides the required basic active center for the catalytic hydrolysis reaction of COS. To verify that the La-STO@T catalyst synthesized in this study is B-site doped, it was characterized by XRD analysis, which proved this conclusion.

[0106] Combined with appendix Figure 4 The XRD magnification images of the strongest diffraction peaks of the (110) crystal plane corresponding to STO in the four groups of samples show that the main characteristic peaks of SrTiO3 (110) shifted after doping, which basically confirms that La was successfully introduced into the SrTiO3@TiO2 system. At the same time, the pure phase STO@T shows that the content ratio of SrTiO3 to TiO2 is close to 2 / 1, while the introduction of La significantly increases the proportion of TiO2 in it. This obviously shows that La competes with TiO2 in the formation of SrTiO3, and both affect the B sites of the perovskite material. This also provides evidence for the successful introduction of La into the B sites of SrTiO3 in SrTiO3 in strontium titanate.

[0107] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing a carbonyl sulfur hydrolysis catalyst, characterized in that, The specific steps are as follows: Step 1): Add Sr(NO3)2 and TiO2 to a certain amount of deionized water, stir at a constant speed until fully mixed and dissolved, then add La(NO3)3·6H2O according to the loading ratio and stir evenly, and finally add mineralizer to obtain a mixed suspension; Step 2): The mixed suspension was stirred for 1 hour at room temperature and pressure, then sealed and heated at 200°C for 24 hours to obtain a solid precipitate; Step 3): Cool the solid precipitate to room temperature, centrifuge and wash to obtain the precipitate; Step 4): Dry the precipitate, grind it into powder, and calcine it to obtain a carbonyl sulfur hydrolysis catalyst; The carbonyl sulfur hydrolysis catalyst is obtained by modifying strontium titanate at the B site with rare earth metal La to obtain the carbonyl sulfur hydrolysis catalyst La-STO@T; In step 1), the Sr:Ti molar ratio in Sr(NO3)2 and TiO2 is 1:1; The loading ratio mentioned in step 1) is 3%~13%, and the loading ratio is based on the molar ratio of La(NO3)3·6H2O to the sum of La(NO3)3·6H2O and TiO2; Step 4) The heating rate of calcination is 5℃ / min, the temperature is raised to 400~800℃, and the calcination time is 4h.

2. The method for preparing a carbonyl sulfur hydrolysis catalyst according to claim 1, characterized in that, In step 1), the solid-liquid ratio of Sr(NO3)2 and TiO2 to deionized water is 0.1 g / mL; the solid-liquid ratio of the mineralizing agent to deionized water is 0.02 g / mL.

3. The method for preparing a carbonyl sulfur hydrolysis catalyst according to claim 1, characterized in that, Step 1) The mineralizing agent is one of NaOH, KOH, Na2CO3, and K2CO3.

4. The method for preparing a carbonyl sulfur hydrolysis catalyst according to claim 1, characterized in that, Step 1) The stirring speed is 70 r / min, and the time is 5~10 min.

5. The application of a carbonyl sulfur hydrolysis catalyst, characterized in that, The application of the carbonyl sulfur hydrolysis catalyst obtained by any of the preparation methods of claims 1-4 in the photothermal synergistic catalytic hydrolysis of carbonyl sulfur in blast furnace gas purification.

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