A blast furnace gas bifunctional hydrolysis catalyst and its preparation method and application

Abstract

The present invention discloses a dual-function blast furnace gas hydrolysis catalyst comprising mesoporous alumina as the active component, nitrogen as a reaction gas scavenger, and low-sulfur titanium dioxide as an additive. The molar ratio of nitrogen, low-sulfur titanium dioxide, and mesoporous alumina is (0.05-0.25):(0.10-0.20):1, respectively. The average pore diameter of the mesoporous alumina is 15-25 nm. The invention also discloses a method for preparing the hydrolysis catalyst: weighing the raw materials, dissolving aluminum nitrate and nitrogen precursors in deionized water, stirring uniformly, adding titanium dioxide slurry, and ultrasonically stirring uniformly; adding NH3·H2O, adjusting the pH to 8-10, and sequentially standing at room temperature, stirring at elevated temperatures, filtering, drying, grinding, and calcining. The invention also discloses the use of the catalyst for the simultaneous removal of COS and CS2 at 100-150°C. The catalyst has high desulfurization efficiency, a long service life, and can achieve simultaneous hydrolysis of COS and CS2.

Description

Technical Field

[0001] The invention relates to a hydrolysis catalyst and a preparation method and application thereof, in particular to a blast furnace gas dual-function hydrolysis catalyst and a preparation method and application thereof. Background Art

[0002] The sulfur species in blast furnace gas are primarily inorganic sulfur (H2S) and organic sulfur (COS, CS2, etc.). While H2S removal processes are well-developed, the removal of organic sulfur remains a challenge in current blast furnace gas desulfurization technology. Compared to other traditional processes such as adsorption and catalytic hydrogenation, the hydrolysis catalytic method offers milder reaction conditions and significantly lower energy consumption and investment, making it a widely recognized organic sulfur conversion technology in the steel industry.

[0003] The core of the hydrolysis catalytic method lies in the development of efficient and stable hydrolysis catalysts. Based on the type of carrier, these catalysts can be primarily categorized as non-metallic oxide-based, metal oxide-based, and other carrier-based. Activated carbon catalysts, among others, suffer from strong adsorption, poor hydrolysis selectivity, and a short lifespan, making them difficult to apply to blast furnace gas desulfurization treatment in complex atmospheres, low flue gas temperatures, and high organic sulfur content. Metal oxide-based hydrolysis catalysts, such as γ-Al2O3, offer promising applications due to their large specific surface area, high surface activity, excellent thermal stability, and adjustable pH.

[0004] Existing catalysts have short lifespans, rapid deactivation, and a limited removal function. They also exhibit significant adsorption during the purification process, making them difficult to commercialize. For example, patent CN112058273A discloses an activated carbon-based catalyst. Its core component is an activated carbon-based catalyst loaded with one or more of zinc oxide, iron oxide, manganese oxide, and copper oxide as active components, with alkali metal or alkaline earth metal oxides acting as co-catalysts to enhance the catalyst's catalytic efficiency. However, the desulfurization mechanism of this catalyst is primarily adsorption-oxidation. Once adsorption saturation occurs, the desulfurization efficiency rapidly decreases. Furthermore, the catalyst only provides COS removal efficiency, resulting in a single function.

[0005] Simultaneous removal of COS and CS2 from blast furnace gas is crucial for in-depth treatment in the steel industry and for improving the universality of blast furnace gas desulfurization under various operating conditions. Currently, activated carbon materials are primarily used for simultaneous removal of COS and CS2. However, due to their significant adsorption and insufficient selectivity in the hydrolysis reaction, these materials suffer from poor stability and short lifespan, making them difficult to apply in blast furnace gas desulfurization. Therefore, a catalyst with high desulfurization efficiency, long lifespan, and dual-functionality for simultaneous hydrolysis is urgently needed. Summary of the Invention

[0006] Purpose of the invention: In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a blast furnace gas bifunctional hydrolysis catalyst having high desulfurization efficiency, long service life, high activity, and strong anti-poisoning performance. Another purpose of the present invention is to provide a convenient and controllable method for preparing the blast furnace gas bifunctional hydrolysis catalyst. A further purpose of the present invention is to provide an application of a blast furnace gas bifunctional hydrolysis catalyst in the simultaneous removal of COS and CS2 at 100-150°C.

[0007] Technical solution: The bifunctional hydrolysis catalyst for blast furnace gas described in the present invention comprises mesoporous alumina as an active component, nitrogen as a reaction gas scavenger, and low-sulfur titanium dioxide as an auxiliary agent; the molar ratio of nitrogen, low-sulfur titanium dioxide and mesoporous alumina is (0.05-0.25):(0.10-0.20):1 respectively; the average pore diameter of the mesoporous alumina is 15-25 nm.

[0008] Furthermore, the SO4 2- The content is less than 0.5wt%.

[0009] The method for preparing a blast furnace gas bifunctional hydrolysis catalyst according to the present invention comprises the following steps:

[0010] Step 1: Weigh the nitrogen precursor, titanium dioxide slurry, and aluminum nitrate separately in a molar ratio of (0.05-0.25):(0.10-0.20):1, first dissolve the aluminum nitrate and nitrogen precursor in deionized water, stir evenly, then add the titanium dioxide slurry, and continue ultrasonic stirring to form a solution to be processed;

[0011] Step 2: slowly add NH3·H2O dropwise to the solution to be processed, adjust the pH to 8-10, and sequentially perform standing at room temperature, stirring at elevated temperature, filtration, drying, grinding, and calcining at 600-750°C under a protective atmosphere to obtain a blast furnace gas bifunctional hydrolysis catalyst.

[0012] Furthermore, in step 1, the ultrasonic frequency of the ultrasonic stirring is 60-100 kHz. The precursor of the carrier is Al(NO3)3, and the precursor of nitrogen is one or more of thiourea, urea, pyridine, and ammonia.

[0013] Furthermore, in step 2, NH3·H2O is added dropwise to the solution to be processed. The addition is stopped after precipitation occurs, and the solution is ultrasonically clarified again, and the operation is repeated until the solution cannot be clarified. The standing time at room temperature is 24 to 48 hours. The time for heating and stirring is 2 to 3 hours, the stirring speed is 40 to 60 r / s, and the temperature is 40 to 60°C. The drying is first dried at 100 to 120°C for 22 to 26 hours, and then continued to dry at 140 to 160°C for 10 to 12 hours. The calcination time is 4 to 6 hours, and the protective atmosphere is nitrogen, ammonia or argon.

[0014] The invention discloses an application of a blast furnace gas bifunctional hydrolysis catalyst in the simultaneous removal of COS and CS2 at 100-150°C.

[0015] Preparation principle: In the catalyst, nitrogen doping provides additional capture sites for COS and CS2 molecules, and the strong CN bonding greatly enhances the adsorption capacity of gas molecules on the catalyst surface. Al serves as the active site for the hydrolysis reaction, and Ti serves as a reaction aid to promote the occurrence of the hydrolysis reaction. The calculation results of DFT simulation of adsorption and reaction also prove that the hydrolysis reaction path is optimized, mainly manifested in the optimization of the CS bond breaking process and the reduction of the reaction energy barrier. This effectively promotes the low-temperature hydrolysis activity of the catalyst and lowers the activation temperature. The C atoms in the catalyst reaction molecules interact strongly with the N atoms of the catalyst, causing the molecules to bend to a certain extent and be strongly adsorbed on the surface of the catalyst, showing greater adsorption energy, shorter bond length and stronger orbital hybridization. This proves that the catalyst has stronger reaction molecule adsorption and activation capabilities, effectively improving the low-temperature synchronous removal performance of the catalyst.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following significant features:

[0017] 1. High desulfurization efficiency, service life of up to 100h, capable of achieving dual-function synchronous hydrolysis of COS and CS2;

[0018] 2. The preparation method is simple and easy to operate. By adjusting the order of adding the precursors, the carrier precursor and nitrogen precursor are added first, and then fully stirred under ultrasonic conditions to promote the full interaction between nitrogen and aluminum components, thereby avoiding the influence of the addition of titanium slurry on the pH condition and the impact of aluminum and other components;

[0019] 3. The carrier is selected from mesoporous alumina to ensure that the reaction gas diffuses rapidly on the surface and inside of the catalyst, the reaction products are quickly separated, and the deposition of sulfur and sulfate inside the catalyst is reduced, thereby extending the service life of the catalyst;

[0020] 4. Titanium uses low sulfur (SO4 2- Titanium dioxide (with a content of no more than 0.5%) improves the anti-poisoning performance of the catalyst while not excessively inhibiting the adsorption of organic sulfur molecules, thereby increasing the activity and reaction life of the catalyst;

[0021] 5. Ultrasonic assistance and slow dropwise addition can, on the one hand, suppress uneven mixing caused by flocculation and precipitation in small areas, and on the other hand, ensure that precursors such as nitrogen are evenly encapsulated in the precipitated particles. The gas molecules generated by decomposition during the drying and calcination process can improve the pore structure, increase the specific surface area of ​​the catalyst, and provide more surface active sites, making the catalyst more active and more resistant to poisoning.

[0022] 6. Calcination is carried out under a protective gas atmosphere. The nitrogen precursor decomposes more slowly and will not be lost due to rapid oxidation and decomposition. More N atoms are fixed on the catalyst surface and further interact with the aluminum sites to produce a capture-hydrolysis dual-site hydrolysis catalyst, maximizing the improvement effect of the N additive on activity and anti-poisoning performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The relationship curve between the CS2 conversion rate and temperature of the hydrolysis catalyst of the present invention is shown in FIG.

[0024] Figure 2 The relationship curve between COS conversion rate and temperature of the hydrolysis catalyst of the present invention is shown in FIG.

[0025] Figure 3 is a long-term deterioration curve of the hydrolysis catalyst of the present invention;

[0026] Figure 4 is the pore size distribution curve of the hydrolysis catalyst of the present invention, wherein a is Comparative Example 1 and b is Example 1;

[0027] Figure 5 This is the adsorption reaction path optimization result of the hydrolysis catalyst in Comparative Example 1;

[0028] Figure 6 This is the adsorption reaction path optimization result of the hydrolysis catalyst of the present invention. DETAILED DESCRIPTION

[0029] In the following examples, the titanium dioxide slurry is a low-sulfur titanium dioxide slurry, SO4 2- The content was less than 0.5wt%, purchased from Zhejiang DeChuang Environmental Protection Technology Co., Ltd.

[0030] Example 1

[0031] The catalyst raw materials are: 5 g of aluminum nitrate, 0.186 g of thiourea, and 0.78 g of titanium dioxide.

[0032] A method for preparing a blast furnace gas bifunctional hydrolysis catalyst comprises the following steps:

[0033] Step 1: Weigh thiourea, titanium dioxide slurry, and aluminum nitrate in a molar ratio of 0.05:0.10:1. First, dissolve aluminum nitrate and thiourea in 50 mL of deionized water, stir evenly, then add titanium dioxide slurry, and continue ultrasonic stirring until completely dissolved to form a solution to be processed;

[0034] Step 2: Under 80kHz ultrasonic conditions, 5mL of NH3·H2O was slowly added dropwise to the solution to be processed. Ultrasonication was continued for 10 minutes. Once the solution was homogenized, 5mL of aqueous ammonia was added again. This process was repeated until the pH reached 10. The resulting emulsion was allowed to stand at 25°C for 36 hours, then stirred in a magnetic stirrer at 50°C for 3 hours at 60 rpm. The emulsion was then dried at 110°C for 24 hours and then at 150°C for 11 hours. After removal, the emulsion was ground to a size of less than 100 mesh and calcined at 650°C in a tube furnace under a nitrogen atmosphere for 5 hours to produce a bifunctional blast furnace gas hydrolysis catalyst with a N:Ti:Al2O3 molar ratio of 0.05:0.10:1.

[0035] Example 2

[0036] The catalyst raw materials are: 5 g of aluminum nitrate, 0.735 g of urea, and 1.56 g of titanium dioxide.

[0037] A method for preparing a blast furnace gas bifunctional hydrolysis catalyst comprises the following steps:

[0038] Step 1: Weigh urea, titanium dioxide slurry, and aluminum nitrate in a molar ratio of 0.25:0.20:1. First, dissolve aluminum nitrate and urea in 50 mL of deionized water, stir evenly, then add titanium dioxide slurry, and continue ultrasonic stirring until completely dissolved to form a solution to be processed;

[0039] Step 2: Under 80kHz ultrasonic conditions, 5mL of NH3·H2O was slowly added dropwise to the solution to be processed. Ultrasonication was continued for 10 minutes. Once the solution was homogenized, 5mL of aqueous ammonia was added again. This process was repeated until the pH reached 10. The resulting emulsion was allowed to stand at 25°C for 36 hours, then stirred in a magnetic stirrer at 50°C at 60 rpm for 3 hours. The emulsion was then dried at 110°C for 24 hours and then at 150°C for 11 hours. After removal, the emulsion was ground to a size of less than 100 mesh and calcined at 650°C in a tube furnace under a nitrogen atmosphere for 5 hours to produce a bifunctional blast furnace gas hydrolysis catalyst with a N:Ti:Al2O3 molar ratio of 0.25:0.20:1.

[0040] Example 3

[0041] The catalyst raw materials are: 5 g of aluminum nitrate, 0.372 g of thiourea, and 1.17 g of titanium dioxide.

[0042] A method for preparing a blast furnace gas bifunctional hydrolysis catalyst comprises the following steps:

[0043] Step 1: Weigh thiourea, titanium dioxide slurry, and aluminum nitrate in a molar ratio of 0.10:0.15:1. First, dissolve aluminum nitrate and thiourea in 50 mL of deionized water, stir evenly, then add titanium dioxide slurry, and continue ultrasonic stirring until completely dissolved to form a solution to be processed;

[0044] Step 2: Under 80kHz ultrasonic conditions, 5mL of NH3·H2O was slowly added dropwise to the solution to be processed. Ultrasonication was continued for 10 minutes. Once the solution was homogenized, 5mL of aqueous ammonia was added again. This process was repeated until the pH reached 10. The resulting emulsion was allowed to stand at 25°C for 36 hours, then stirred in a magnetic stirrer at 50°C for 3 hours at 60 rpm. The emulsion was then dried at 110°C for 24 hours and then at 150°C for 11 hours. After removal, the emulsion was ground to a size of less than 100 mesh and calcined at 650°C in a tube furnace under a nitrogen atmosphere for 5 hours to produce a bifunctional blast furnace gas hydrolysis catalyst with a N:Ti:Al2O3 molar ratio of 0.10:0.15:1.

[0045] Comparative Example 1

[0046] The catalyst was commercial γAl2O3 without any treatment or modification.

[0047] Test Example 1

[0048] The catalysts prepared in Comparative Example 1 and Examples 3 were ground, tableted, and sieved, and 0.5 ml of a 40-60 mesh sample was taken for catalytic activity testing. The test temperature range was 50-150°C. The experiment used cylinder gas to simulate blast furnace gas, in which the volume fractions of COS, CS2, and O2 were 0.02%, 0.01%, and 0.5%, respectively. N2 was used as the carrier gas, the total gas flow rate was set at 200 ml / min, and the hourly space velocity (GHSV) was 24000 h -1 Before the mixed gas passes through the reaction tube, it first passes through a first-level gas washing bottle filled with 50ml of pure water to achieve the introduction of H2O. The concentrations of COS, CS2 and H2S are measured by GC-9860 gas chromatograph (Haorpu, China), and SO2 is detected by 350-XL flue gas analyzer (Testo, Germany). The analysis results are as follows: Figure 1 .

[0049] Depend on Figures 1 and 2 It can be seen that: (1) When comparative example 1 is used as a hydrolysis catalyst, the CS2 and COS removal rates are 10% and 100% at 100°C, 40% and 100% at 125°C, and 56% at 50°C.

[0050] (2) The nitrogen-doped blast furnace gas bifunctional hydrolysis catalyst prepared in Example 1 had CS2 and COS removal rates of 36% and 100% at 100°C, 89% and 100% at 125°C, and 82% at 50°C;

[0051] (3) The nitrogen-doped blast furnace gas bifunctional hydrolysis catalyst prepared in Example 2 had CS2 and COS removal rates of 29% and 100% at 100°C, 73% and 100% at 125°C, and 85% at 50°C;

[0052] (4) The nitrogen-doped blast furnace gas bifunctional hydrolysis catalyst prepared in Example 3 had CS2 and COS removal rates of 43% and 100% at 100°C, 92% and 100% at 125°C, and 88% at 50°C;

[0053] In summary, the hydrolysis catalysts prepared in Examples 1-3 have a low activation temperature and a wide active temperature window, and possess the dual function of simultaneously removing COS and CS2. The hydrolysis catalysts prepared in Examples 1-3 can achieve over 90% CS2 removal and 100% COS removal at 125°C. Among them, Example 3 is the most preferred embodiment.

[0054] Test Example 2

[0055] Test Example 2: The catalysts prepared in Comparative Example 1 and Example 1 were subjected to a long-term deterioration test. The test conditions were the same as those in Test Example 1. The test results are shown in FIG. Figure 3 .Depend on Figure 3 It can be seen that the hydrolysis catalyst prepared by this invention has strong anti-poisoning ability and a long lifespan. After 120 hours of testing, the COS removal rate of the catalyst remained stable at over 100%, and the CS2 removal rate remained stable at 40%. In contrast, the COS removal rate of the catalyst in Comparative Example 1 dropped to 80%, and the CS2 removal rate dropped to 0%. This demonstrates that the catalyst prepared by this invention has high efficiency at low temperatures and is resistant to poisoning.

[0056] The BET specific surface area test was performed on the catalysts prepared in Comparative Example 1 and Examples 1-3. The pore size distribution results are shown in FIG. Figure 4 The BET specific surface area results are shown in Table 1 below.

[0057] Table 1 BET specific surface area test results of catalysts

[0058] sample <![CDATA[BET specific surface area (m 2 / g)]]> <![CDATA[Pore volume (cm 3 / g)]]> Average pore size (nm) Comparative Example 1 164.49 0.260 5.07 Example 1 184.76 0.280 6.05 Example 2 174.37 0.246 5.97 Example 3 195.64 0.295 6.16

[0059] Depend on Figure 4It can be seen that the pore size of Comparative Example 1 is mainly about 5 nm, and the pore size distribution is relatively concentrated. The hydrolysis catalyst prepared by this invention, taking Example 1 as an example, has a pore size distribution in the range of 5-10 nm, a wider pore size distribution, and a larger specific surface area of ​​the catalyst, which is conducive to exposing more surface active sites, enhancing the adsorption and diffusion of the reaction gas, thereby achieving improved catalytic activity and anti-poisoning performance.

[0060] Figures 5 and 6 The DFT model of Comparative Example 1 and Example 1 and the calculation results of adsorption of COS and CS2 are shown in FIG. Figures 5 and 6 It can be seen that the adsorption of the reaction gas in Comparative Example 1 is weak, the adsorption energy is low, and the reaction molecules exist on the catalyst surface in the form of physical adsorption, with weak orbital hybridization. However, in the catalyst prepared by the present invention, the C atoms in the reaction molecules interact strongly with the N atoms of the catalyst, causing the molecules to bend to a certain extent, strongly adsorbing on the surface of the catalyst, showing greater adsorption energy, shorter bond lengths and stronger orbital hybridization. This proves that the catalyst has stronger reaction molecule adsorption and activation capabilities, effectively improving the low-temperature synchronous removal performance of the catalyst.

[0061] Example 4

[0062] The catalyst raw materials are: 5 g of aluminum nitrate, 1.16 g of pyridine, and 0.94 g of titanium dioxide.

[0063] A method for preparing a blast furnace gas bifunctional hydrolysis catalyst comprises the following steps:

[0064] Step 1: Pyridine, titanium dioxide slurry, and aluminum nitrate were weighed separately in a molar ratio of 0.15:0.12:1. First, aluminum nitrate and pyridine were dissolved in 50 mL of deionized water, stirred evenly, and then titanium dioxide slurry was added. Ultrasonic stirring was continued until completely dissolved to form a solution to be processed;

[0065] Step 2: Under 60kHz ultrasonic conditions, 5mL of NH3·H2O was slowly added dropwise to the solution to be processed. Ultrasonication was continued for 10 minutes. Once the solution was homogenized, 5mL of aqueous ammonia was added again. This process was repeated until the pH reached 8. The resulting emulsion was allowed to stand at 25°C for 24 hours, then stirred in a magnetic stirrer at 40°C for 2 hours at 40 rpm. The emulsion was then dried at 100°C for 22 hours and then at 140°C for another 10 hours. After removal, the emulsion was ground to a size of less than 100 mesh and calcined at 600°C in a tube furnace under an ammonia atmosphere for 4 hours to produce a bifunctional blast furnace gas hydrolysis catalyst with a N:Ti:Al2O3 molar ratio of 0.15:0.12:1.

[0066] Example 5

[0067] The catalyst raw materials are: 5 g aluminum nitrate, 0.68 g ammonia water, and 1.40 g titanium dioxide.

[0068] A method for preparing a blast furnace gas bifunctional hydrolysis catalyst comprises the following steps:

[0069] Step 1: Weigh ammonia water, titanium dioxide slurry, and aluminum nitrate in a molar ratio of 0.20:0.18:1. First, dissolve aluminum nitrate and ammonia water in 50 mL of deionized water, stir evenly, then add titanium dioxide slurry, and continue ultrasonic stirring until completely dissolved to form a solution to be processed;

[0070] Step 2: Under 100kHz ultrasonic conditions, 5mL of NH3·H2O was slowly added dropwise to the solution to be processed. Ultrasonication was continued for 10 minutes. Once the solution was homogenized, 5mL of aqueous ammonia was added again, and the process was repeated until the pH reached 9. The resulting emulsion was allowed to stand at 25°C for 36 hours, then stirred in a magnetic stirrer at 60°C at 50 rpm for 2.5 hours. The emulsion was then dried at 120°C for 26 hours and then at 160°C for another 12 hours. After removal, the emulsion was ground to a size of less than 100 mesh and calcined at 750°C in a tube furnace under argon atmosphere for 6 hours to produce a blast furnace gas bifunctional hydrolysis catalyst with a N:Ti:Al2O3 molar ratio of 0.20:0.18:1.

[0071] Comparative Example 2

[0072] The remaining steps of this comparative example are the same as those of Example 3, except that: SO4 in the titanium dioxide slurry 2- The content is 1.0wt%. The results show that the CS2 and COS removal rates of the obtained catalyst are 21% and 100% at 100℃, 54% and 100% at 125℃, and 68% at 50℃. Therefore, SO4 in the titanium dioxide slurry 2- When the concentration is greater than 0.5wt%, the conversion rate of COS and CS2 will be significantly reduced, which is not conducive to the occurrence of hydrolysis reaction.

Claims

1. A method for preparing a blast furnace gas bifunctional hydrolysis catalyst, characterized in that: The following steps are involved: Step 1: Weigh the nitrogen precursor, titanium dioxide slurry, and aluminum nitrate separately in a molar ratio of (0.05-0.25):(0.10-0.20):1, first dissolve the aluminum nitrate and nitrogen precursor in deionized water, stir evenly, then add the titanium dioxide slurry, and continue ultrasonic stirring to form a solution to be processed; Step 2: slowly add NH3·H2O dropwise to the solution to be processed, adjust the pH to 8-10, and sequentially perform standing at room temperature, stirring at elevated temperature, filtration, drying, grinding, and calcining at 600-750°C under a protective atmosphere to obtain a blast furnace gas bifunctional hydrolysis catalyst.

2. The method for preparing a blast furnace gas bifunctional hydrolysis catalyst according to claim 1, wherein: In the step 1, the ultrasonic frequency of the ultrasonic stirring is 60-100 kHz.

3. The method for preparing a blast furnace gas bifunctional hydrolysis catalyst according to claim 1, wherein: In the second step, NH3·H2O is added dropwise to the solution to be processed. When precipitation occurs, the addition is stopped. Ultrasonication is performed until the solution becomes clear again, and the operation is repeated until the solution cannot be clarified.

4. The method for preparing a blast furnace gas bifunctional hydrolysis catalyst according to claim 1, wherein: In the step 2, the time of standing at room temperature is 24 to 48 hours.

5. The method for preparing a blast furnace gas bifunctional hydrolysis catalyst according to claim 1, characterized in that: In the step 2, the heating and stirring time is 2 to 3 hours, the stirring speed is 40 to 60 r / s, and the temperature is 40 to 60°C.

6. The method for preparing a blast furnace gas bifunctional hydrolysis catalyst according to claim 1, characterized in that: In the step 2, the drying is first performed at 100-120°C for 22-26 hours, and then further dried at 140-160°C for 10-12 hours.

7. The method for preparing a blast furnace gas bifunctional hydrolysis catalyst according to claim 1, characterized in that: In the step 2, the calcination time is 4 to 6 hours, and the protective atmosphere is nitrogen, ammonia or argon.

8. The method for preparing a blast furnace gas bifunctional hydrolysis catalyst according to claim 1, characterized in that: The blast furnace gas bifunctional hydrolysis catalyst uses mesoporous alumina as an active component, nitrogen as a reaction gas capture agent, and low-sulfur titanium dioxide as an auxiliary agent; the molar ratio of nitrogen, low-sulfur titanium dioxide and mesoporous alumina is (0.05-0.25):(0.10-0.20):1; the average pore size of the mesoporous alumina is 15-25 nm; the SO4 2- The content is less than 0.5wt%.

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