Preparation method of mesoporous carbon loaded platinum-based catalyst

Abstract

The invention discloses a preparation method of a mesoporous carbon loaded platinum-based catalyst, and relates to the technical field of catalysts, and the preparation method comprises the following preparation steps: carrying out acid-alkali treatment on mesoporous carbon at normal temperature, and then washing and drying; the preparation method comprises the following steps: preparing a platinum nano particle suspension, placing the platinum nano particle suspension in a vacuum tank, reducing the vacuum degree of the vacuum tank to 0.05-0.15 atmospheric pressure, keeping vacuum, adding the platinum nano particle suspension into the vacuum tank, carrying out ultrasonic treatment under a vacuum condition, gradually adjusting the pressure from a vacuum state to normal pressure, repeating the pressure circulation for several times, and filtering to obtain the platinum-containing mesoporous carbon. Normal-temperature inert gas is used for purging the platinum-containing mesoporous carbon; and drying the purged platinum-containing mesoporous carbon, and calcining the dried platinum-containing mesoporous carbon in an inert gas to finally obtain the mesoporous carbon loaded platinum-based catalyst. The mesoporous carbon loaded platinum-based catalyst prepared by the method can ensure that nano particles are uniformly filled in pores, and the high activity and long-term stability of the mesoporous carbon loaded platinum-based catalyst are improved.

Description

Technical Field

[0001] The invention relates to the technical field of catalysts, and in particular to a method for preparing a mesoporous carbon-supported platinum-based catalyst. Background Art

[0002] With the growth of global energy demand and the improvement of environmental protection awareness, the development of clean energy technology has received more and more attention. Fuel cells, as an efficient and environmentally friendly energy conversion device, have shown great application potential in clean energy vehicles, distributed power generation and portable power sources. Among the various types of fuel cells, proton exchange membrane fuel cells (PEMFCs) have attracted much attention due to their high energy conversion efficiency, low emissions and fast response characteristics.

[0003] One of the core components of fuel cells is the catalyst, especially the cathode catalyst for redox reaction (ORR). Platinum (Pt) is the most commonly used catalyst material due to its excellent catalytic activity. However, Pt resources are scarce and expensive, and are susceptible to corrosion and aggregation in practical applications, resulting in decreased catalyst performance. Therefore, the development of high-efficiency, high-stability and cost-effective Pt-based catalysts is a hot topic in current research.

[0004] Mesoporous carbon materials are considered to be ideal catalyst carriers due to their unique pore structure, high specific surface area and good chemical stability. They can provide more active sites, improve mass transfer, and increase the dispersion and durability of catalysts. Therefore, good catalytic effects are often achieved by loading platinum nanoparticles into mesoporous carbon.

[0005] In the prior art, traditional impregnation methods, such as simple impregnation drying or heat treatment, often lead to the aggregation of nanoparticles on the surface of the carrier rather than uniform distribution in the pores. This surface loading not only reduces the accessibility of active sites, but also may cause rapid deactivation of the catalyst, making it difficult to achieve deeper and more uniform nanoparticle loading.

[0006] Based on this, how to efficiently and uniformly load platinum nanoparticles into mesoporous carbon supports while maintaining their high activity and long-term stability remains a technical challenge. Summary of the invention

[0007] The purpose of the present invention is to provide a method for preparing a mesoporous carbon-supported platinum-based catalyst to solve the following technical problems:

[0008] How to improve the high activity and long-term stability of mesoporous carbon-supported platinum-based catalysts?

[0009] The purpose of the present invention can be achieved through the following technical solutions:

[0010] A method for preparing a mesoporous carbon-supported platinum-based catalyst comprises the following preparation steps:

[0011] S1: The mesoporous carbon is treated with acid and alkali at room temperature, followed by washing and drying.

[0012] S2: taking the washed and dried mesoporous carbon and placing it in a vacuum tank, reducing the vacuum degree of the vacuum tank to 0.05-0.15 atmospheres, while maintaining the vacuum, adding 10-100 mg / mL of platinum nanoparticle suspension into the vacuum tank, so that the mesoporous carbon is fully immersed in the platinum nanoparticle suspension to form a mixed solution; wherein the amount ratio of the mesoporous carbon to the platinum nanoparticle suspension is 1 g: (8-12) mL;

[0013] Preferably, the vacuum degree of the vacuum tank is reduced to 0.1 atmosphere;

[0014] Preferably, the ratio of mesoporous carbon to platinum nanoparticle suspension is 1 g:10 mL;

[0015] Preferably, the platinum nanoparticle suspension is a directly purchased commercial platinum nanoparticle suspension obtained by diluting it.

[0016] S3: Under vacuum conditions, the mixed solution is ultrasonically treated to promote uniform dispersion and deep penetration of platinum nanoparticles in the pores of the mesoporous carbon; then the pressure is gradually adjusted from the vacuum state to normal pressure, and the pressure cycle is repeated 3-5 times to further promote the filling of platinum nanoparticles into the mesoporous carbon;

[0017] S4: filtering the mixed liquid after the pressure cycle to obtain platinum-containing mesoporous carbon, and using an inert gas at room temperature to purge the platinum-containing mesoporous carbon to remove the residual solvent on the surface and the nanoparticles in the solvent;

[0018] Preferably, when filtering the mixed solution, a 300-500 mesh screen is used for sieving to remove the non-penetrated nanoparticles attached to the surface of the carrier.

[0019] S5: Drying the purged platinum-containing mesoporous carbon, and then calcining it under an inert gas to solidify the platinum nanoparticles and enhance the bonding between the platinum nanoparticles and the carrier, and finally obtaining a mesoporous carbon-supported platinum-based catalyst.

[0020] In a further embodiment of the present invention: in step S1, the pore size of the mesoporous carbon is in the range of 6-10 nm, and the specific surface area is in the range of 1000-1500 m 2 / g.

[0021] In a further embodiment of the present invention: in step S1, the method of acid-base treatment of mesoporous carbon is:

[0022] First, the mesoporous carbon is placed in a 3.5-4.5 mol / L hydrochloric acid solution and soaked for 1.5-2.5 hours, and then transferred to a 2.5-3.5 mol / L sodium hydroxide solution and soaked for 1.5-2.5 hours;

[0023] Preferably, the concentration of the hydrochloric acid solution is 4 mol / L, and the immersion time is 2 h; the concentration of the hydrochloric acid solution is 3 mol / L, and the immersion time is 2 h.

[0024] In a further embodiment of the present invention: in step S1, the method for washing and drying the mesoporous carbon after acid-base treatment is:

[0025] The mesoporous carbon after acid-base treatment is washed several times in deionized water, and then dried in an oven at 75-85°C for 11-13h to remove the acid and base residual during the acid-base treatment;

[0026] Preferably, the washing times are 3-5 times, the drying temperature is 80° C., and the drying time is 12 hours.

[0027] In a further embodiment of the present invention: in step S2, in the platinum nanoparticle suspension, the particle size of the platinum nanoparticles is 3-5 nm.

[0028] In a further embodiment of the present invention: in step S2, the solvent of the platinum nanoparticle suspension is ethanol.

[0029] In a further embodiment of the present invention, in step S3, the mixed solution is subjected to ultrasonic treatment by using ultrasonic parameters of 30-60 kHz and 100-300 W for 30-100 min.

[0030] Preferably, the ultrasonic parameters are 40-50kHz, 150-250W, and the treatment time is 50-80min;

[0031] More preferably, the ultrasonic parameters are 45 kHz, 200 W, and the treatment time is 60 min.

[0032] In a further embodiment of the present invention: in step S4, when the platinum-containing mesoporous carbon is purged with an inert gas at room temperature, the flow rate of the inert gas is 10-200 mL / min, and the purging time is 10-60 min.

[0033] Preferably, the flow rate of the inert gas is 50-150 mL / min, and the purge time is 20-40 min;

[0034] More preferably, the flow rate of the inert gas is 100 mL / min and the purge time is 30 min;

[0035] In a further embodiment of the present invention: in step S5, the method for drying the purged platinum-containing mesoporous carbon is as follows: drying the purged platinum-containing mesoporous carbon at 75-85° C. for 1-3 h;

[0036] Preferably, the drying temperature is 80° C. and the drying time is 2 h.

[0037] In a further embodiment of the present invention, in step S5, the method of calcining under an inert gas is as follows: calcining the dried platinum-containing mesoporous carbon at 500-700° C. for 2 hours under an inert gas atmosphere.

[0038] Preferably, the calcination temperature is 550-650°C;

[0039] More preferably, the calcination temperature is 600°C.

[0040] Beneficial effects of the present invention:

[0041] In the preparation method of the mesoporous carbon-supported platinum-based catalyst of the present invention, the mesoporous carbon carrier is first treated with acid and alkali to improve its surface polarity to facilitate the adsorption of nanoparticles; then the treated carrier is ultrasonically assisted impregnated with a solution containing platinum nanoparticles under a vacuum environment, and pressure circulation is used to promote the nanoparticles to penetrate into the pores; after impregnation, surface residues are removed by screening and blowing; finally, the nanoparticles are solidified by high-temperature calcination to complete the preparation;

[0042] During the preparation process, the vacuum ultrasonic impregnation method is used to significantly improve the dispersion of platinum nanoparticles in the mesoporous carbon carrier and reduce the agglomeration phenomenon; the vacuum environment lowers the boiling point of the solution and increases the osmotic pressure, allowing the platinum nanoparticles to penetrate deeper into the pores of the mesoporous carbon, thereby improving the loading efficiency; at the same time, the cavitation effect generated by ultrasound assistance is further promoted to further promote the uniform distribution of nanoparticles in the pores; screening and purge can effectively remove excess nanoparticles and solvents on the surface of the carrier, reduce the surface load, and ensure that the nanoparticles are mainly filled in the pores, thus helping to improve the high activity and long-term stability of mesoporous carbon-supported platinum-based catalysts. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention will be further described below in conjunction with the accompanying drawings.

[0044] Figure 1 It is a flow chart of the preparation method of the mesoporous carbon-supported platinum-based catalyst of the present invention;

[0045] Figure 2 is a TEM image of the mesoporous carbon-supported platinum-based catalyst prepared in Example 9 of the present invention;

[0046] Figure 3 This is a particle size analysis diagram of the mesoporous carbon-supported platinum-based catalyst prepared in Example 9 of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] See also Figure 1 The present invention discloses a method for preparing a mesoporous carbon-supported platinum-based catalyst, comprising the following preparation steps:

[0049] Step 1: Treat the mesoporous carbon with acid or alkali at room temperature, and then wash and dry it.

[0050] Among them, the pore size of mesoporous carbon is in the range of 6-10nm and the specific surface area is 1000-1500m 2 / g;

[0051] The method of acid-base treatment of mesoporous carbon is as follows: firstly, the mesoporous carbon is placed in a 3.5-4.5 mol / L hydrochloric acid solution and soaked for 1.5-2.5 hours, and then transferred to a 2.5-3.5 mol / L sodium hydroxide solution and soaked for 1.5-2.5 hours;

[0052] The method for washing and drying the mesoporous carbon after the acid-base treatment is as follows: washing the mesoporous carbon after the acid-base treatment in deionized water for 3-5 times, and then drying it in an oven at 75-85° C. for 11-13 hours to remove the acid and alkali residues during the acid-base treatment;

[0053] Step 2: Place the washed and dried mesoporous carbon in a vacuum tank, reduce the vacuum degree of the vacuum tank to 0.05-0.15 atmospheres, and while maintaining the vacuum, add 10 mg / mL-100 mg / mL of a platinum nanoparticle suspension to the vacuum tank, so that the mesoporous carbon is fully immersed in the platinum nanoparticle suspension to form a mixed solution; wherein the amount ratio of the mesoporous carbon to the platinum nanoparticle suspension is 1 g: (8-12) mL;

[0054] The platinum nanoparticle suspension is obtained by diluting a directly purchased commercial platinum nanoparticle suspension, and the solvent is ethanol, and the particle size of the platinum nanoparticles is 3-5 nm; for example, a platinum nanoparticle suspension with an average particle size of 3 nm and a concentration of 100 mg / mL can be directly purchased, and then diluted to prepare a platinum nanoparticle suspension of 10 mg / mL-100 mg / mL.

[0055] Step 3: Under vacuum conditions, the mixed solution is ultrasonically treated at 30-60kHz and 100-300W for 30-100min to promote the uniform dispersion and deep penetration of platinum nanoparticles in the pores of the mesoporous carbon; then the pressure is gradually adjusted from the vacuum state to normal pressure, and the pressure cycle is repeated 3-5 times to further promote the filling of platinum nanoparticles into the mesoporous carbon.

[0056] Step 4: The mixed liquid after the pressure cycle is screened with a 300-500 mesh screen to obtain platinum-containing mesoporous carbon to remove the unpenetrated nanoparticles attached to the surface of the carrier, and then the platinum-containing mesoporous carbon is purged with an inert gas at room temperature to remove the residual solvent on the surface and the nanoparticles in the solvent; the flow rate of the inert gas is 10-200 mL / min, and the purging time is 10-60 min.

[0057] Step 5: Dry the purged platinum-containing mesoporous carbon at 75-85°C for 1-3 hours, and then calcine at 500-700°C for 2 hours under inert gas to solidify the platinum nanoparticles and enhance their bonding with the carrier, and finally obtain a mesoporous carbon-supported platinum-based catalyst.

[0058] Example 1

[0059] Add 100 mL of 4 mol / L hydrochloric acid solution to beaker 1 and 100 mL of 3 mol / L hydrochloric acid solution to beaker 2; then add 15 g of 8 nm average pore size and 1300 m 2 / g of mesoporous carbon is first added to beaker 1 and soaked for 2h, then the hydrochloric acid solution is filtered out, and then the mixture is transferred to beaker 2 and soaked for 2h. After the sodium hydroxide solution is filtered out, the acid-base treated mesoporous carbon is obtained, and then the mesoporous carbon is transferred to a glass cup, and deionized water is injected into the glass cup to wash the mesoporous carbon. The washing is repeated 4 times to obtain clean mesoporous carbon, and the clean mesoporous carbon is transferred to a crucible, and then the crucible is placed in an oven and dried at 80°C for 12h. After being taken out, the washed and dried mesoporous carbon is obtained. After weighing, the washed and dried mesoporous carbon is 13.25g.

[0060] Example 2

[0061] A platinum nanoparticle suspension with an average particle size of 3 nm and a concentration of 100 mg / mL was purchased (purchased from Swiss Danqing Technology Group). The solvent was ethanol. After dilution, 10 groups of platinum nanoparticle suspensions with concentrations of 10 mg / mL, 20 mg / mL, 30 mg / mL, 40 mg / mL, 50 mg / mL, 60 mg / mL, 70 mg / mL, 80 mg / mL, 90 mg / mL, and 100 mg / mL were prepared respectively.

[0062] Example 3

[0063] 1 g of the washed and dried mesoporous carbon obtained in Example 1 was placed in a vacuum tank, and the vacuum degree of the vacuum tank was reduced to 0.5 atmospheres. While maintaining the vacuum, 8 mL of the platinum nanoparticle suspension prepared in Example 2 with a concentration of 10 mg / mL was added to the vacuum tank to fully immerse the mesoporous carbon in the platinum nanoparticle suspension to form a mixed solution; under vacuum conditions, the mixed solution was ultrasonically treated at 30 kHz and 100 W for 100 min, and then the pressure was gradually adjusted from the vacuum state to normal pressure, and the pressure cycle was repeated 3 times. The mixed solution after the pressure cycle was sieved with a 300-mesh screen to obtain platinum-containing mesoporous carbon, and then the platinum-containing mesoporous carbon was purged with warm argon at a flow rate of 10 mL / min at room temperature for 65 min. The purged platinum-containing mesoporous carbon was transferred to a crucible, and then placed in an oven at 75° C. for drying for 3 h. After drying, it was calcined at 500° C. for 2 hours under argon protection to obtain a mesoporous carbon-supported platinum-based catalyst.

[0064] Example 4

[0065] 1 g of the washed and dried mesoporous carbon obtained in Example 1 was placed in a vacuum tank, and the vacuum degree of the vacuum tank was reduced to 0.1 atmospheres. While maintaining the vacuum, 10 mL of the platinum nanoparticle suspension prepared in Example 2 with a concentration of 20 mg / mL was added to the vacuum tank to fully immerse the mesoporous carbon in the platinum nanoparticle suspension to form a mixed solution; under vacuum conditions, the mixed solution was ultrasonically treated at 45 kHz and 200 W for 65 min, and then the pressure was gradually adjusted from the vacuum state to normal pressure, and the pressure cycle was repeated 4 times. The mixed solution after the pressure cycle was sieved with a 400-mesh sieve to obtain platinum-containing mesoporous carbon, and then the platinum-containing mesoporous carbon was purged with warm argon at room temperature at a flow rate of 100 mL / min for 45 min, and the purged platinum-containing mesoporous carbon was transferred to a crucible, and then placed in an oven at 80° C. for drying for 2 h. After drying, it was calcined at 600° C. for 2 hours under argon protection to obtain a mesoporous carbon-supported platinum-based catalyst.

[0066] Example 5

[0067] 1 g of the washed and dried mesoporous carbon obtained in Example 1 was placed in a vacuum tank, and the vacuum degree of the vacuum tank was reduced to 0.15 atmospheres. While maintaining the vacuum, 12 mL of the platinum nanoparticle suspension prepared in Example 2 with a concentration of 30 mg / mL was added to the vacuum tank to fully immerse the mesoporous carbon in the platinum nanoparticle suspension to form a mixed solution; under vacuum conditions, the mixed solution was ultrasonically treated at 60 kHz and 300 W for 30 min, and then the pressure was gradually adjusted from the vacuum state to normal pressure, and the pressure cycle was repeated 5 times. The mixed solution after the pressure cycle was sieved with a 500-mesh sieve to obtain platinum-containing mesoporous carbon, and then the platinum-containing mesoporous carbon was purged with warm argon at a flow rate of 200 mL / min at room temperature for 10 min. The purged platinum-containing mesoporous carbon was transferred to a crucible, and then placed in an oven at 85° C. for drying for 1 h. After drying, it was calcined at 700° C. for 2 hours under argon protection to obtain a mesoporous carbon-supported platinum-based catalyst.

[0068] Example 6

[0069] Compared with Example 4, the only difference is that the platinum nanoparticle suspension with a concentration of 20 mg / mL prepared in Example 2 is replaced by the platinum nanoparticle suspension with a concentration of 40 mg / mL prepared in Example 2.

[0070] Example 7

[0071] Compared with Example 4, the only difference is that the platinum nanoparticle suspension with a concentration of 20 mg / mL prepared in Example 2 is replaced by the platinum nanoparticle suspension with a concentration of 50 mg / mL prepared in Example 2.

[0072] Example 8

[0073] Compared with Example 4, the only difference is that the platinum nanoparticle suspension with a concentration of 20 mg / mL prepared in Example 2 is replaced by the platinum nanoparticle suspension with a concentration of 60 mg / mL prepared in Example 2.

[0074] Example 9

[0075] Compared with Example 4, the only difference is that the platinum nanoparticle suspension with a concentration of 20 mg / mL prepared in Example 2 is replaced by the platinum nanoparticle suspension with a concentration of 70 mg / mL prepared in Example 2.

[0076] Example 10

[0077] Compared with Example 4, the only difference is that the platinum nanoparticle suspension with a concentration of 20 mg / mL prepared in Example 2 is replaced by the platinum nanoparticle suspension with a concentration of 80 mg / mL prepared in Example 2.

[0078] Embodiment 11

[0079] Compared with Example 4, the only difference is that the platinum nanoparticle suspension with a concentration of 20 mg / mL prepared in Example 2 is replaced by the platinum nanoparticle suspension with a concentration of 90 mg / mL prepared in Example 2.

[0080] Example 12

[0081] Compared with Example 4, the only difference is that the platinum nanoparticle suspension with a concentration of 20 mg / mL prepared in Example 2 is replaced by the platinum nanoparticle suspension with a concentration of 100 mg / mL prepared in Example 2.

[0082] The morphology of the mesoporous carbon-supported platinum-based catalysts prepared in Examples 3-12 was detected. Taking Example 9 as an example, the TEM image of the mesoporous carbon-supported platinum-based catalyst prepared is as follows: Figure 2 As shown in the figure, the particle size analysis is as follows Figure 3 As shown, Figure 2-3 Combined analysis shows that the platinum particle size distribution of the mesoporous carbon-supported platinum-based catalyst is uniform, with an average particle size of about 3.9 nm, which indicates that most of the platinum particles are located inside the mesoporous carbon pores, and the confinement effect of the mesopores limits the growth of platinum during the calcination process.

[0083] The platinum content of the mesoporous carbon-supported platinum-based catalysts prepared in Examples 3-12 was tested, and the test results are listed in Table 1. Table 1 is as follows:

[0084] Table 1

[0085]

[0086]

[0087] By analyzing the data in Table 1, it can be learned that the platinum content of the mesoporous carbon-supported platinum-based catalyst can be adjusted by adjusting the concentration of the platinum nanoparticle suspension. When the concentration of the platinum nanoparticle suspension is 10-100 mg / mL, the platinum content ranges from 9.5% to 72.1%.

[0088] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for preparing a mesoporous carbon-supported platinum-based catalyst, characterized in that: The method comprises the following preparation steps: S1: acid-base treatment of mesoporous carbon at room temperature, followed by washing and drying; S2: taking the washed and dried mesoporous carbon and placing it in a vacuum tank, reducing the vacuum degree of the vacuum tank to 0.05-0.15 atmospheres, while maintaining the vacuum, adding 10-100 mg / mL of platinum nanoparticle suspension into the vacuum tank, so that the mesoporous carbon is fully immersed in the platinum nanoparticle suspension to form a mixed solution; wherein the amount ratio of the mesoporous carbon to the platinum nanoparticle suspension is 1 g: (8-12) mL; S3: Under vacuum conditions, the mixed solution is subjected to ultrasonic treatment, and then the pressure is gradually adjusted from the vacuum state to normal pressure, and the pressure cycle is repeated 3-5 times; S4: filtering the mixed liquid after the pressure cycle to obtain platinum-containing mesoporous carbon, and purging the platinum-containing mesoporous carbon with an inert gas at room temperature; S5: drying the purged platinum-containing mesoporous carbon, and calcining the dried mesoporous carbon under an inert gas to finally obtain a mesoporous carbon-supported platinum-based catalyst.

2. The method for preparing a mesoporous carbon-supported platinum-based catalyst according to claim 1, characterized in that: In step S1, the mesoporous carbon has a pore size range of 6-10 nm and a specific surface area of ​​1000-1500 m 2 / g.

3. The method for preparing a mesoporous carbon-supported platinum-based catalyst according to claim 2, characterized in that: In step S1, the method of acid-base treatment of mesoporous carbon is: The mesoporous carbon is first placed in a 3.5-4.5 mol / L hydrochloric acid solution and soaked for 1.5-2.5 hours, and then transferred to a 2.5-3.5 mol / L sodium hydroxide solution and soaked for 1.5-2.5 hours.

4. The method for preparing a mesoporous carbon-supported platinum-based catalyst according to claim 3, characterized in that: In step S1, the method for washing and drying the mesoporous carbon after acid-base treatment is: The acid-base treated mesoporous carbon was washed several times in deionized water and then dried in an oven at 75-85° C. for 11-13 h.

5. The method for preparing a mesoporous carbon-supported platinum-based catalyst according to claim 1, characterized in that: In step S2, in the platinum nanoparticle suspension, the particle size of the platinum nanoparticles is 3-5 nm.

6. The method for preparing a mesoporous carbon-supported platinum-based catalyst according to claim 5, characterized in that: In step S2, the solvent of the platinum nanoparticle suspension is ethanol.

7. The method for preparing a mesoporous carbon-supported platinum-based catalyst according to claim 1, characterized in that: In step S3, the mixed solution is subjected to ultrasonic treatment by using ultrasonic parameters of 30-60 kHz and 100-300 W for 30-100 min.

8. The method for preparing a mesoporous carbon-supported platinum-based catalyst according to claim 1, characterized in that: In step S4, when the platinum-containing mesoporous carbon is purged with an inert gas at room temperature, the flow rate of the inert gas is 10-200 mL / min, and the purging time is 10-60 min.

9. The method for preparing a mesoporous carbon-supported platinum-based catalyst according to claim 1, characterized in that: In step S5, the method for drying the purged platinum-containing mesoporous carbon is as follows: drying the purged platinum-containing mesoporous carbon at 75-85°C for 1-3 hours.

10. The method for preparing a mesoporous carbon-supported platinum-based catalyst according to claim 9, characterized in that: In step S5, the method of calcining under an inert gas is: calcining the dried platinum-containing mesoporous carbon at 500-700° C. for 2 hours under an inert gas atmosphere.

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