Spherical catalyst for hydrogen peroxide synthesis via anthraquinone process and preparation method therefor

Abstract

Provided in the present invention are a spherical catalyst for hydrogen peroxide synthesis via an anthraquinone process and a preparation method therefor, belonging to the technical fields of catalytic materials and catalyst preparation. The method comprises: reacting a first aluminum source, which has P123 mixed therein, with a precipitant to obtain an aluminum oxide precursor, redispersing the aluminum oxide precursor in P123 and assembling to obtain a porous aluminum oxide precursor; dispersing the porous aluminum oxide precursor and a second aluminum source in deionized water, and adding a solution of a palladium-containing compound and an additive-containing compound to prepare a catalyst precursor slurry; adding gelatin and gum arabic to the catalyst precursor slurry and uniformly mixing same to prepare a composite colloidal solution, adding the colloidal solution dropwise to a liquid column consisting of an upper-layer oil phase and a lower-layer curing agent, and then carrying out aging, drying, calcining, and reduction to obtain the spherical catalyst. The present invention is doped with the porous aluminum oxide precursor, thereby improving the pore structure of the catalyst, increasing the utilization rate of the interior of spherical aluminum oxide, and reducing the mass transfer resistance of the reaction.

Description

Spherical catalyst for synthesizing hydrogen peroxide by anthraquinone method and preparation method thereof Technical Field

[0001] The invention belongs to the technical field of catalytic materials and catalyst preparation, and particularly relates to a spherical catalyst for synthesizing hydrogen peroxide by an anthraquinone method and a preparation method thereof. Background Art

[0002] Hydrogen peroxide is an important inorganic chemical product, widely used in industrial fields such as medicine, papermaking, textiles, chemicals, and environmental protection. The main methods for producing hydrogen peroxide include the anthraquinone method, electrolysis, alcohol oxidation method, and direct hydrogen-oxygen reaction method, among which the anthraquinone method is the most widely used. Currently, more than 90% of industrial hydrogen peroxide production plants using the anthraquinone method use fixed-bed palladium catalysts. It has the advantages of low investment, high output, and simple operation. Although fixed-bed palladium catalysts are available in various shapes such as toothed spheres, strips, clover-shaped, and spheres, the first three catalysts are less commonly used because of their rough surface, uneven texture, and easy depalladiuming or pulverization. Spherical catalysts formed by droplet molding have been widely used due to their smooth surface, uniform texture, and excellent pore structure.

[0003] Patent CN 110639512 A discloses a spherical catalyst for producing hydrogen peroxide using the anthraquinone process. Aluminum powder reacts with hydrochloric acid to produce a solution, which is then reacted with pseudoboehmite to produce an aluminum sol. The aluminum sol is mixed with hexamethylenetetramine, urea, and a template to produce a composite colloid formed into a liquid column. The resulting spherical alumina, dried and calcined, serves as a catalyst carrier and is first impregnated with an alkali metal solution and then with a Pd-containing impregnation solution. Drying and calcination are required in between steps. The preparation process for this catalyst involves complex impregnation, drying, and calcination steps, resulting in a long production cycle and high costs. Furthermore, the need to use metallic aluminum as an aluminum source increases the synthesis cost.

[0004] On the other hand, the anthraquinone hydrogenation reaction is mainly affected by diffusion. Increasing the specific surface area of ​​the catalyst to promote the dispersion of active sites and increasing the pore size and pore volume of the catalyst to reduce the diffusion resistance of the reactants in the catalyst pores are the key to improving the activity of the catalyst. Patent CN 104368374 A discloses an integral catalyst for the production of hydrogen peroxide by the anthraquinone method. By filling the ceramic with a composite coating of molecular sieve-oxide, the specific surface area is increased while the mesoporous pore volume is increased. However, molecular sieves with strong acidity are not suitable for anthraquinone hydrogenation reactions due to the reduction in selectivity. This team disclosed a preparation process for improving the pore structure of alumina (CN 106219582 A), and the specific surface area of ​​alumina is >428 m 2 / g, with a pore volume of up to 2.14 cm 3 / gram, the pore size is mainly distributed between 5-20 nanometers. If this material is added during the molding process, it is expected to improve the pore structure of the spherical carrier after molding. At the same time, the team invented a process for preparing spherical alumina from one or more aluminum sources selected from pseudo-boehmite, boehmite, metallic aluminum, aluminum salt, and alcohol aluminum (CN 113289595 B). The average particle size of spherical alumina is between 1.8-1.85 mm, and the average strength is between 35-75 N. However, the maximum specific surface area of ​​spherical alumina is 240 m 2 / g, with a maximum pore volume of 0.7 cm 3 / gram.

[0005] Therefore, how to design and prepare a spherical catalyst with high mechanical strength, smooth surface, good precious metal dispersion and developed pore structure has become an urgent problem to be solved in the production of hydrogen peroxide catalyst by the anthraquinone method. Technical issues

[0006] The purpose of the present invention is to solve the problems of long preparation cycle and low efficiency of existing spherical catalysts, and to provide a spherical catalyst for synthesizing hydrogen peroxide by an anthraquinone method and a preparation method thereof. Technical Solutions

[0007] A method for preparing a spherical catalyst for synthesizing hydrogen peroxide by an anthraquinone process comprises the following steps:

[0008] (1) reacting a first aluminum source mixed with P123 with a precipitant to obtain an aluminum oxide precursor, and redispersing the aluminum oxide precursor in P123 and assembling to obtain a porous aluminum oxide precursor;

[0009] (2) dispersing the porous alumina precursor and the second aluminum source in deionized water, and adding a solution containing a palladium compound and a promoter compound to prepare a catalyst precursor slurry;

[0010] (3) Add gelatin and gum arabic to the above catalyst precursor slurry and mix them evenly to form a composite glue solution, which is then dripped into a liquid column consisting of an upper oil phase and a lower curing agent. After aging, drying, calcining, and reduction, a spherical catalyst is obtained.

[0011] Preferably, in step (2), the second aluminum source is one or more of ammonium aluminum carbonate, pseudo-boehmite, aluminum sol or aluminum oxide.

[0012] Preferably, in step (2), the mass ratio of the porous alumina precursor to the second aluminum source is (0.1-1):1 in terms of alumina.

[0013] Preferably, the palladium-containing compound in step (2) comprises one or more of PdCl2, Na2PdCl4, (NH4)2PdCl4 or Pd(NO3)2.

[0014] Preferably, the auxiliary compound in step (2) is a soluble salt of potassium or sodium.

[0015] Preferably, the auxiliary compound in step (2) is potassium carbonate or sodium nitrate.

[0016] Preferably, in the composite glue in step (3),

[0017] The mass content of alumina is controlled to be 5-20wt%;

[0018] The gelatin content is controlled to be 0.5-8wt%;

[0019] The mass content of the gum arabic is controlled to be 0.5-8wt%.

[0020] Preferably, in step (3), the drying temperature is 50-100° C., and the drying time is 6-24 hours.

[0021] Preferably, in step (3), the calcination temperature is 500-1000° C., and the calcination time is 6-24 hours.

[0022] The present invention also provides a spherical catalyst obtained by the above preparation method, wherein the palladium content in the spherical catalyst is 0.1-1wt%, the catalyst promoter content is 0.001-2wt%, and the aluminum oxide content is 97-99.8wt%. Beneficial effects

[0023] The present invention provides a spherical catalyst for synthesizing hydrogen peroxide by an anthraquinone method and a preparation method thereof. The spherical catalyst is prepared based on the action of a metal precursor and an alumina precursor, and then based on the sol-gel properties of a polymer material. The precursor of the active metal / auxiliary agent directly acts on the alumina precursor to promote the dispersion of the active metal / auxiliary agent components in the carrier and enhance the adhesion. At the same time, due to the doping of the porous alumina precursor, the pore structure of the catalyst is improved, the utilization rate inside the spherical alumina is increased, and the mass transfer resistance of the reaction is reduced. Compared with the preparation method of the traditional catalyst, the entire preparation process eliminates the subsequent impregnation, drying, and roasting steps in the catalyst preparation, shortens the production process, improves production efficiency, and is easier to achieve industrial continuous production. And because the Pd particles are better stabilized in the spherical catalyst, the phenomenon of palladium de-powdering in industrial applications is suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a product photograph of the spherical catalyst prepared in Example 1 of the present invention. Modes for Carrying Out the Invention

[0025] A spherical catalyst for synthesizing hydrogen peroxide by an anthraquinone method and a preparation method thereof, comprising the following steps:

[0026] (1) reacting a first aluminum source mixed with P123 with a precipitant to obtain an aluminum oxide precursor, and redispersing the aluminum oxide precursor in P123 and assembling to obtain a porous aluminum oxide precursor;

[0027] According to the present invention, the first aluminum source is first mixed with the precipitant, the mixing temperature is preferably room temperature, the mixing time is preferably 2-3 hours, the first aluminum source is preferably AlCl3·6H2O, the precipitant is preferably NaOH, OH - and Al 3+ The molar ratio of the mixed precipitate is preferably 3.25:1, and then the mixed precipitate is filtered and washed, and then redispersed in Al 3+ The mixture is stirred in a P123 solution having a P123 / P123 molar ratio of 23.2, and the stirring time is preferably 3-4 hours. The resulting composite is dried, and the drying temperature is preferably 100° C. and the drying time is preferably 12 hours to obtain a porous alumina precursor; the P123 is a polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer with a molecular formula of: PEO-PPO-PEO;

[0028] (2) dispersing the porous alumina precursor and the second aluminum source in deionized water, and adding a solution containing a palladium compound and a promoter compound to prepare a catalyst precursor slurry;

[0029] According to the present invention, the key to improving the pore structure of the porous alumina precursor lies in the regulation of the interaction between the precursor and P123. However. During molding, the second aluminum source may competitively bind to P123. At the same time, the porous alumina precursor has little benefit on the strength of the spherical alumina. This requires the selection of a suitable second aluminum source and ratio to provide peptization to increase the strength of the spherical alumina without affecting the interaction between the precursor and P123. The second aluminum source is preferably one or more of ammonium aluminum carbonate, pseudo-boehmite, aluminum sol or alumina, and the mass ratio of the porous alumina precursor to the second aluminum source in terms of alumina is preferably 0.1-1;

[0030] The present invention selects a suitable Pd compound that can be better dissolved into the catalyst precursor slurry and further better dispersed and attached to the aluminum source. The palladium-containing compound preferably includes one or more of PdCl2, Na2PdCl4, (NH4)2PdCl4 or Pd(NO3)2. The auxiliary compound is preferably a soluble salt of potassium or sodium, more preferably potassium carbonate or sodium nitrate. The addition amount of the palladium-containing compound and the auxiliary compound is preferably 0.001-2wt% of the mass of alumina, and the mass ratio of the palladium-containing compound to the auxiliary compound is preferably 0.716: (1.32-2.7).

[0031] (3) Add gelatin and gum arabic to the above catalyst precursor slurry and mix them evenly to form a composite glue solution, which is then dripped into a liquid column consisting of an upper oil phase and a lower curing agent. After aging, drying, calcining, and reduction, a spherical catalyst is obtained.

[0032] According to the present invention, the P123 present in the porous alumina precursor of the present invention can react with the gelatin and gum arabic added during the molding process. Therefore, selecting a suitable ratio of gelatin and gum arabic will facilitate connecting the porous alumina precursor with the second aluminum source without changing the interaction between the precursor and P123. This will be the key to regulating the strength, sphericity and pore structure of spherical alumina. In the composite glue solution in step (3), the mass content of alumina is preferably controlled to be 5-20wt%; the mass content of the gelatin is preferably controlled to be 0.5-8wt%; and the mass content of the gum arabic is preferably controlled to be 0.5-8wt%.

[0033] According to the present invention, the curing agent solution phase contains 1 wt% glutaraldehyde and 0.4 wt% surfactant (AEO-6), and the pH of the curing agent solution phase is adjusted to 3-4 using nitric acid. The temperature in the liquid column is controlled at 5-10°C, and the droplets of the composite adhesive shrink into spheres in the white oil phase. After passing through the oil-water interface and entering the curing agent solution phase, they undergo a gelation reaction to form composite gel spheres. The gel spheres are further immersed in the curing agent solution phase for 5-60 minutes to completely solidify. The solidified gel spheres are removed, dried, calcined, and reduced to obtain spherical catalysts.

[0034] According to the present invention, an appropriate treatment temperature is required to suppress the sintering of Pd species on the spherical alumina during the drying and calcining processes. In step (3), the drying temperature is preferably 50-100°C and the time is preferably 6-24 hours; the calcining temperature is preferably 500-1000°C and the time is preferably 6-24 hours. The reduction temperature is preferably 530°C and the reduction time is preferably 3 hours.

[0035] The present invention also discloses a spherical catalyst prepared by the method. The palladium content in the spherical catalyst is 0.1-1wt%, the catalyst auxiliary content is 0.001-2wt%, and the aluminum oxide content is 97-99.8wt%.

[0036] The present invention is further described in detail below with reference to specific examples, in which the raw materials involved are all commercially available. Example

[0037] The preparation method of a spherical catalyst for synthesizing hydrogen peroxide by anthraquinone method described in this embodiment comprises the following steps:

[0038] (1) Mix the solution containing NaOH and the solution containing AlCl3·6H2O according to the OH - and Al 3+ The molar ratio of 3.25 was adjusted several times to mix the pH value to form a white precipitate, and the mixture was stirred for 2 hours. The precipitate was filtered, washed, and then dispersed in Al 3+ The mixture was stirred for 3 hours in a P123 solution with a molar ratio of 1% to 1% P123 of 23.2, and then the composite of the precipitate and the P123 solution was evaporated and dried in an oven at 100° C. for 12 hours to obtain a porous alumina precursor.

[0039] (2) 0.716 g of Pd(NO3)2 was dissolved in 13 g of 65% nitric acid solution to prepare a palladium solution; 100 g of pseudo-boehmite with an alumina content was dispersed in deionized water, and then the prepared palladium solution was added to prepare a palladium-containing aluminum sol; a porous alumina precursor with an alumina content of 10 g (the mass ratio of the porous alumina precursor to the second aluminum source in terms of alumina was 0.1) was added to prepare a palladium-containing alumina precursor slurry with an alumina content of 10 wt%; finally, 1.32 g of potassium carbonate and 10 ml of ammonia water were added to the palladium-containing alumina precursor slurry, and the mixture was stirred at high speed to prepare a catalyst precursor slurry.

[0040] (3) The catalyst precursor slurry is heated to 60°C, and then 30g of gelatin and 30g of gum arabic are added and stirred thoroughly to dissolve to prepare a composite glue solution; the composite glue solution is dripped into a liquid column composed of an upper layer of white oil and a lower layer of a curing agent solution phase to form a solid; the curing agent solution phase contains 1wt% of glutaraldehyde and 0.4wt% of surfactant (AEO-6), and the pH of the curing agent solution phase is adjusted to 3-4 with nitric acid; the temperature in the liquid column is controlled to 5-10°C, and the composite glue solution is The droplets shrink into balls in the white oil phase, and after passing through the oil-water interface and entering the curing agent solution phase, a gelation reaction occurs to form composite gel balls. The gel balls are further immersed in the curing agent solution phase for 5-60 minutes to completely solidify them. The solidified gel balls are taken out and dried at 100°C for 6 hours, then calcined at 850°C for 24 hours. After calcination, they are reduced with hydrogen at 530°C for 3 hours, and then cooled to room temperature under a nitrogen atmosphere to obtain the finished product. A product photo of the spherical catalyst prepared in Example 1 is shown in Figure 1.

[0041] The spherical catalyst prepared in this example has an average particle size of 2.2 mm, an average strength of 85 N / particle, a bulk density of 0.67 g / ml, a pore volume of 0.60 ml / g, and a specific surface area of ​​110 m 2 / g, palladium content is 0.3wt%, potassium content is 0.678wt%, and wear rate is 0.05%. Example

[0042] The preparation method of a spherical catalyst for synthesizing hydrogen peroxide by anthraquinone method described in this embodiment comprises the following steps:

[0043] (1) Mix the solution containing NaOH and the solution containing AlCl3·6H2O according to the OH - and Al 3+ The molar ratio of 3.25 was adjusted several times to mix the pH value to form a white precipitate, and the mixture was stirred for 2 hours. The precipitate was filtered, washed, and then dispersed in Al 3+ The mixture was stirred for 3 hours in a P123 solution with a molar ratio of 1% to 1% P123 of 23.2, and then the composite of the precipitate and the P123 solution was evaporated and dried in an oven at 100° C. for 12 hours to obtain a porous alumina precursor.

[0044] (2) 0.716 g of Pd(NO3)2 was dissolved in 13 g of 65% nitric acid solution to prepare a palladium solution; 80 g of pseudo-boehmite with an alumina content was dispersed in deionized water, and then the prepared palladium solution was added to prepare a palladium-containing aluminum sol; a porous alumina precursor with an alumina content of 30 g (the mass ratio of the porous alumina precursor to the second aluminum source in terms of alumina was 0.375) was added to prepare a palladium-containing alumina precursor slurry with an alumina content of 10 wt%; finally, 1.32 g of potassium carbonate and 10 ml of ammonia water were added to the palladium-containing alumina precursor slurry, and the mixture was stirred at high speed to prepare a catalyst precursor slurry.

[0045] (3) The prepared catalyst precursor slurry is shaped, aged, dried, calcined, and reduced according to the method described in step (3) of Example 1 to obtain a finished product.

[0046] The spherical catalyst prepared in this example has an average particle size of 2.2 mm, an average strength of 70 N / particle, a bulk density of 0.45 g / ml, a pore volume of 0.75 ml / g, and a specific surface area of ​​119 m 2 / g, palladium content is 0.3wt%, and wear rate is 0.06%. Example

[0047] The preparation method of a spherical catalyst for synthesizing hydrogen peroxide by anthraquinone method described in this embodiment comprises the following steps:

[0048] (1) Mix the solution containing NaOH and the solution containing AlCl3·6H2O according to the OH - and Al 3+ The molar ratio of 3.25 was adjusted several times to mix the pH value to form a white precipitate, and the mixture was stirred for 2 hours. The precipitate was filtered, washed, and then dispersed in Al 3+The mixture was stirred for 3 hours in a P123 solution with a molar ratio of 1% to 1% P123 of 23.2, and then the composite of the precipitate and the P123 solution was evaporated and dried in an oven at 100° C. for 12 hours to obtain a porous alumina precursor.

[0049] (2) 0.716 g of Pd(NO3)2 was dissolved in 13 g of 65% nitric acid solution to prepare a palladium solution; 70 g of pseudo-boehmite with an alumina content was dispersed in deionized water, and then the prepared palladium solution was added to prepare a palladium-containing aluminum sol; a porous alumina precursor with an alumina content of 40 g (the mass ratio of the porous alumina precursor to the second aluminum source in terms of alumina was 0.57) was added to prepare a palladium-containing alumina precursor slurry with an alumina content of 10 wt%; finally, 2.7 g of sodium nitrate and 10 ml of ammonia water were added to the palladium-containing alumina precursor slurry, and the mixture was stirred at high speed to prepare a catalyst precursor slurry.

[0050] (3) The prepared catalyst precursor slurry is shaped, aged, dried, calcined, and reduced according to the method described in step (3) of Example 1 to obtain a finished product.

[0051] The spherical catalyst prepared in this example has an average particle size of 2.2 mm, an average strength of 56 N / particle, a bulk density of 0.37 g / ml, a pore volume of 0.9 ml / g, and a specific surface area of ​​130 m 2 / g, palladium content is 0.3wt%, and wear rate is 0.09%.

[0052] Comparative Example 1

[0053] The preparation method of a spherical catalyst for synthesizing hydrogen peroxide by anthraquinone method described in this comparative example comprises the following steps:

[0054] (1) 0.716 g of Pd(NO3)2 was dissolved in 13 g of 65% nitric acid solution to prepare a palladium solution; 110 g of pseudo-boehmite with an alumina content was dispersed in a certain amount of deionized water, and then the prepared palladium solution was added to prepare a palladium-containing alumina precursor slurry with an alumina content of 10 wt%; finally, 1.32 g of potassium carbonate and 10 ml of ammonia water were added to the palladium-containing alumina precursor slurry, and the mixture was stirred at high speed to prepare a catalyst precursor slurry.

[0055] (2) The catalyst precursor slurry is heated to 60°C, and then 30g of gelatin and 30g of gum arabic are added and stirred thoroughly to dissolve to prepare a composite glue solution; the composite glue solution is dripped into a liquid column composed of an upper layer of white oil and a lower layer of a curing agent solution phase to form a solid; the curing agent solution phase contains 1wt% of glutaraldehyde and 0.4wt% of surfactant (AEO-6), and the pH of the curing agent solution phase is adjusted to 3-4 with nitric acid; the temperature in the liquid column is controlled to 5-10°C, and the composite glue solution is The liquid droplets will shrink into balls in the white oil phase, and after passing through the oil-water interface and entering the curing agent solution phase, a gelation reaction will occur to form composite gel balls, and the gel balls are further immersed in the curing agent solution phase for 5-60 minutes to completely solidify them; the solidified gel balls are taken out and dried at 100°C for 12 hours, and then calcined at 850°C for 18 hours. After the calcination is completed, they are reduced with hydrogen at 530°C for 3 hours, and then cooled to room temperature under a nitrogen atmosphere to obtain the finished product.

[0056] The spherical catalyst prepared in this example has an average particle size of 2.2 mm, an average strength of 105 N / particle, a bulk density of 0.75 g / ml, a pore volume of 0.51 ml / g, and a specific surface area of ​​102 m 2 / g, palladium content is 0.3wt%, and wear rate is 0.03%. Example

[0057] The activity of the prepared catalyst was evaluated as follows:

[0058] ① Prepare the working solution by mixing heavy aromatic hydrocarbons and trioctyl phosphate in a volume ratio of 3:1 to obtain a mixed solvent. Then add 2-ethylanthraquinone and dissolve it completely to obtain the working solution for activity evaluation. The mass concentration of 2-ethylanthraquinone is 120 g / L.

[0059] Catalyst activity was evaluated in a jacketed glass reactor with a catalyst loading of 5 g, a controlled reaction temperature of 50°C, a pressure of 0.3 MPa, a hydrogen flow rate of 3 L / h, and a working fluid flow rate of 0.2 L / h. The catalyst evaluation results are shown in Table 1.

[0060] Table 1

[0061]

[0062] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A method for preparing a spherical catalyst for synthesizing hydrogen peroxide by anthraquinone method, characterized in that: The steps include: (1) reacting a first aluminum source mixed with P123 with a precipitant to obtain an aluminum oxide precursor, and redispersing the aluminum oxide precursor in P123 and assembling to obtain a porous aluminum oxide precursor; (2) dispersing the porous alumina precursor and the second aluminum source in deionized water, and adding a solution containing a palladium compound and a promoter compound to prepare a catalyst precursor slurry; (3) Add gelatin and gum arabic to the above catalyst precursor slurry and mix evenly to form a composite glue solution, and drop the glue solution into a liquid column composed of an upper oil phase and a lower curing agent, and then age, dry, calcine, and reduce to obtain a spherical catalyst.

2. The method for preparing a spherical catalyst for synthesizing hydrogen peroxide by anthraquinone method according to claim 1, characterized in that: In the step (2), the second aluminum source is one or more of ammonium aluminum carbonate, pseudo-boehmite, aluminum sol or aluminum oxide.

3. The method for preparing a spherical catalyst for synthesizing hydrogen peroxide by anthraquinone method according to claim 1, characterized in that: In the step (2), the mass ratio of the porous alumina precursor to the second aluminum source is (0.1-1):1 in terms of alumina.

4. The method for preparing a spherical catalyst for synthesizing hydrogen peroxide by anthraquinone method according to claim 1, characterized in that: The palladium-containing compound in step (2) comprises one or more of PdCl2, Na2PdCl4, (NH4)2PdCl4 or Pd(NO3)2.

5. The method for preparing a spherical catalyst for synthesizing hydrogen peroxide by anthraquinone method according to claim 1, characterized in that: The auxiliary compound in step (2) is a soluble salt of potassium or sodium.

6. The method for preparing a spherical catalyst for synthesizing hydrogen peroxide by anthraquinone method according to claim 5, characterized in that: The auxiliary compound in step (2) is potassium carbonate or sodium nitrate.

7. The method for preparing a spherical catalyst for synthesizing hydrogen peroxide by anthraquinone method according to claim 1, characterized in that: In the composite glue solution in step (3), The mass content of aluminum oxide is controlled to be 5-20wt%; Control the mass content of the gelatin to be 0.5-8wt%; The mass content of the gum arabic is controlled to be 0.5-8wt%.

8. The method for preparing a spherical catalyst for synthesizing hydrogen peroxide by anthraquinone method according to claim 1, characterized in that: In the step (3), the drying temperature is 50-100° C. and the drying time is 6-24 hours.

9. The method for preparing a spherical catalyst for synthesizing hydrogen peroxide by anthraquinone method according to claim 1, characterized in that: In the step (3), the calcination temperature is 500-1000° C. and the calcination time is 6-24 hours.

10. The spherical catalyst obtained by the preparation method according to claim 1, characterized in that: The palladium content in the spherical catalyst is 0.1-1wt%, the catalyst promoter content is 0.001-2wt%, and the aluminum oxide content is 97-99.8wt%.

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