Preparation method of highly dispersed, high-load carbon-supported platinum and palladium noble metal catalysts

Abstract

This invention belongs to the field of nanomaterial preparation and noble metal catalysis technology, and relates to a method for preparing a highly dispersed, high-load carbon-supported platinum and palladium noble metal catalyst. The method includes: mixing a functional organic compound with methanol and then ultrasonically dispersing the mixture to obtain a mixture A; adding a carbon support to mixture A, ultrasonically treating it, and then drying it to obtain activated carbon powder B; mixing NaOH and ethylene glycol to obtain a mixture C; adding a Pt or Pd salt, activated carbon powder B, and the mixture C to react and then drying it to obtain a catalyst precursor powder D; grinding the catalyst precursor powder D and then heat-treating it to obtain a highly dispersed, high-load carbon-supported platinum and palladium noble metal catalyst. This invention uses a functional organic compound to surface-functionalize the activated carbon support, strengthening the metal-support interaction, inhibiting the growth and aggregation of nanoparticles, and ensuring uniform dispersion on the carbon support, forming a small-sized, high-load carbon-supported noble metal catalyst, thereby improving the catalyst's catalytic performance and lifespan.

Description

Technical Field

[0001] This invention belongs to the field of nanomaterial preparation and noble metal catalysis technology, and relates to a method for preparing highly dispersed, high-load carbon-supported platinum and palladium noble metal catalysts. Background Technology

[0002] Noble metal catalysts, as metal catalysts, are a class of precious metal catalytic materials that can significantly alter the rate of chemical reactions without participating in the final products. Platinum and palladium-based catalysts are the most widely used. These precious metals, due to their unfilled d-electron orbitals, readily adsorb reactants onto their surfaces, and possess moderate strength, facilitating the formation of intermediate "active compounds." They exhibit high catalytic activity and also possess excellent comprehensive properties such as high-temperature resistance, oxidation resistance, and corrosion resistance, making them the most important catalyst materials. Currently, in the new energy field, supported catalysts using carbon-supported platinum, palladium, ruthenium, and other precious metals have become the most critical component in the development of proton exchange membrane fuel cells, water electrolysis for hydrogen production, and hydrodehydrogenation reactions.

[0003] However, existing carbon-supported noble metal catalysts are typically prepared by directly impregnating activated carbon with an alcohol or aqueous solution of a noble metal salt, followed by a thermal reduction method. A drawback of this process is the weak interaction between the activated carbon and the noble metal, resulting in poor anchoring of the noble metal nanoparticles in the catalyst. This leads to larger particle diameters of the noble metal in the catalyst, resulting in a low specific surface area and unsatisfactory catalytic efficiency. Furthermore, the noble metal loading in existing technologies is generally below 40%, which is insufficient to meet the high metal loading requirements of fuel cell catalysts.

[0004] Therefore, there is an urgent need to explore a catalyst with small noble metal particle size, uniform size distribution, and high loading to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned issues, this invention utilizes the conjugated π bonds in benzoic acid, aniline, benzenethiol, and 1-aminopyridine molecules to form a conjugated structure with localized graphitized units on activated carbon. This creates anchor points on the activated carbon surface containing amino (-NH2), mercapto (-SH), and carboxyl (-COOH) functional groups. In subsequent polyol reduction processes, these anchor points significantly enhance the interaction between the metal and the support, thereby inhibiting the growth and aggregation of metal nanoparticles on the activated carbon surface. This facilitates the formation of small-sized, high-load carbon-supported noble metal catalysts, significantly improving the catalyst's catalytic performance and lifespan.

[0006] The technical solution adopted by this invention to solve the technical problem is: a method for preparing a highly dispersed, high-loading carbon-supported platinum and palladium noble metal catalyst, comprising the following steps:

[0007] Step 1: Mix the functional organic compound and methanol at a mass ratio of 1:8 to 12, and disperse them evenly by ultrasonication to obtain mixture A;

[0008] The carbon support is added to the mixture A, wherein the mass ratio of the carbon support to the mixture is 1:8 to 12. The mixture is ultrasonically treated for 50 to 70 minutes, and then stirred and refluxed at 55 to 65°C for 8 to 12 hours. Finally, after filtration, washing and drying, surface-functionalized activated carbon powder B is obtained.

[0009] Step 2: Mix NaOH and ethylene glycol at a mass ratio of 1:90-110 and stir thoroughly to obtain mixed solution C;

[0010] Step 3: Add Pt salt or Pd salt and activated carbon powder B to mixed solution C. The mass ratio of Pt metal in Pt salt or Pd metal in Pd salt to activated carbon powder B is 1-30:12; the total mass ratio of Pt salt or Pd salt and activated carbon powder B to mixed solution C is 1:900-1100. Stir and reflux the resulting mixture at 150-170℃ for 3-5 hours. After the solution cools to room temperature, adjust the pH to 3.9-4.1 with H2SO4 and continue stirring for 10-14 hours. Finally, filter the reactants, wash with ethanol, and dry to obtain catalyst precursor powder D.

[0011] Step 4: Grind the catalyst precursor powder D and place it in a muffle furnace for heat treatment at 380-420℃ for 50-70 minutes to obtain a highly dispersed, high-load carbon-supported platinum and palladium noble metal catalyst.

[0012] Preferably, in step 1, the functional organic compound includes: benzoic acid, aniline, benzenethiol, and 1-aminopyridine.

[0013] Preferably, in step 1, the functional organic compound and methanol are mixed at a mass ratio of 1:10.

[0014] Preferably, in step 1, the carbon carrier includes: commercial activated carbon Vulcan XC-72, carbon black, and Ketjen black.

[0015] Preferably, in step 1, the mass ratio of the carbon support to the mixture A is 1:10, the mixture is ultrasonically treated for 60 minutes, and then stirred and refluxed at 60°C for 10 hours.

[0016] Preferably, in step 3, the Pt salt includes: chloroplatinic acid H2PtCl6, potassium chloroplatinate K2PtCl4, and platinum acetylacetonate; the Pd salt includes: palladium acetate, palladium nitrate, and palladium acetylacetonate.

[0017] Preferably, in step 3, the mass ratio of Pt metal in the Pt salt or Pd metal in the Pd salt to activated carbon powder B is 3-28:12.

[0018] Preferably, in step 4, the heat treatment temperature of the catalyst precursor powder D is 400°C and the heat treatment time is 60 minutes.

[0019] The beneficial effects of the present invention are:

[0020] 1. This invention utilizes benzoic acid, aniline, benzenethiol, and 1-aminopyridine to surface-functionalize an activated carbon support. The carboxyl, amino, and thiol functional groups in these small organic molecules can form anchor points on the activated carbon support. During the subsequent alcoholic reduction of noble metal ions, these anchor points can strengthen the metal-support interaction by anchoring the formed catalyst nanoparticles, thereby inhibiting the growth and aggregation of nanoparticles in the subsequent process. This ensures that the nanoparticles are uniformly dispersed on the carbon support, forming a small-sized, high-load carbon-supported noble metal catalyst, significantly improving the catalyst's catalytic performance and lifespan.

[0021] 2. In this invention, the prepared catalyst precursor powder is placed in a muffle furnace and heat-treated at 400°C to remove excess small molecule organic compounds from the surface of the carbon support, while further strengthening the interaction between the metal and the support, which helps to improve the stability of the catalyst.

[0022] 3. The present invention requires no additional equipment during the preparation process, and the preparation method is simple, with low equipment requirements, good repeatability, and easy to achieve industrial production.

[0023] 4. The catalyst obtained by this invention has noble metal particles with a diameter between 0.5 and 4 nanometers, uniform particle dispersion, uniform size, and no agglomeration. The noble metal loading can reach up to 70%, showing broad application prospects in fuel cells and related fields such as water electrolysis for hydrogen production. Attached Figure Description

[0024] Figure 1 This is a transmission electron microscope image of a carbon-supported Pt catalyst with a noble metal loading of 20% prepared according to Example 1 of the preparation method of the high-dispersion, high-loading carbon-supported platinum and palladium noble metal catalyst of the present invention.

[0025] Figure 2 This is a transmission electron microscope image of the carbon-supported Pt catalyst with a noble metal loading of 40% prepared in Example 2 of the present invention.

[0026] Figure 3 This is a transmission electron microscope image of the carbon-supported Pt catalyst with a noble metal loading of 70% prepared in Example 3 of the present invention.

[0027] Figure 4This is a transmission electron microscope image of the carbon-supported Pd catalyst with a noble metal loading of 30% prepared in Example 4 of the present invention.

[0028] Figure 5 This is a transmission electron microscope image of the carbon-supported Pd catalyst with a noble metal loading of 50% prepared in Example 5 of the present invention.

[0029] Figure 6 This is a transmission electron microscope image and its size distribution diagram of the carbon-supported Pd catalyst with a carbon noble metal loading of 60% prepared in Example 6 of the present invention. Detailed Implementation

[0030] The related technologies of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] refer to Figures 1-6 The method for preparing a highly dispersed, highly loaded carbon-supported platinum and palladium noble metal catalyst according to this embodiment includes the following steps:

[0032] Step 1: Mix one of the functional organic compounds (benzoic acid, aniline, benzenethiol, 1-aminopyridine) with methanol at a mass ratio of 1:10, and ultrasonically disperse the mixture to obtain a mixture A. Add one of the following carbon carriers: commercial activated carbon Vulcan XC-72, carbon black, or Ketjen black, with a mass ratio of activated carbon to mixture A of 1:10. Ultrasonically treat the mixture for 60 minutes, then stir and reflux at 60°C for 10 hours. Finally, after filtration, washing, and drying, obtain surface-functionalized activated carbon powder B.

[0033] Step 2: Mix NaOH and ethylene glycol at a mass ratio of 1:100 and stir thoroughly to obtain mixture C;

[0034] Step 3: Add Pt salt or Pd salt and activated carbon powder B to mixed solution C. The mass ratio of Pt or Pd metal in Pt salt or Pd salt to activated carbon powder B is 3-28:12; the total mass ratio of Pt salt or Pd salt and activated carbon powder B to solution C is 1:1000. Stir and reflux the resulting mixture at 160°C for 4 hours. After the solution cools to room temperature, adjust the pH to 4 with H2SO4 and continue stirring for 12 hours. Finally, filter the reactants, wash with ethanol, and dry to obtain catalyst precursor powder D.

[0035] Step 4: Grind the catalyst precursor powder D and place it in a muffle furnace. Heat treat it at 400°C for 60 minutes to obtain a highly dispersed, high-load carbon-supported platinum and palladium noble metal catalyst.

[0036] Example

[0037] The present invention will be further described below through specific embodiments.

[0038] Example 1:

[0039] Benzoic acid was dissolved in methanol at a mass ratio of 1:10 and ultrasonicated for 10 minutes to ensure uniform dispersion. Then, commercial activated carbon black was mixed with the solution at a mass ratio of 1:10, ultrasonicated for 60 minutes, and then refluxed at 60°C for 10 hours. Finally, after filtration, washing, and drying, benzoic acid-functionalized activated carbon powder was obtained. NaOH and ethylene glycol were mixed at a mass ratio of 1:100 and stirred thoroughly for 10 minutes. After the NaOH was fully dissolved, an ethylene glycol alkaline solution was obtained. Then, chloroplatinic acid and the surface-functionalized activated carbon powder were added sequentially at a mass ratio of 3:12 (Pt to surface-functionalized activated carbon powder), so that the total mass ratio of chloroplatinic acid and surface-functionalized activated carbon powder to the ethylene glycol alkaline solution was 1:1000. The resulting mixture was stirred and refluxed at 160°C for 4 hours. After the solution cooled to room temperature, the pH was adjusted to 4 with H2SO4, and stirring was continued for 12 hours. Finally, the reactants were filtered, washed with ethanol, dried, ground, and placed in a muffle furnace for heat treatment at 400°C for 60 minutes to obtain a highly dispersed carbon-supported Pt catalyst with approximately 20% noble metal Pt.

[0040] Figure 1 The image shows a transmission electron microscope (TEM) image of the prepared sample. Pt nanoparticles are uniformly dispersed on the carbon black support, with an average particle size of 1.2 nm. The particles are evenly distributed and there is no obvious agglomeration.

[0041] Example 2:

[0042] Aniline was dissolved in methanol at a mass ratio of 1:10 and ultrasonicated for 10 minutes to ensure uniform dispersion. Then, commercial activated carbon Vulcan XC-72 was mixed with the solution at a mass ratio of 1:10, ultrasonicated for 60 minutes, and then refluxed at 60°C for 10 hours. Finally, after filtration, washing, and drying, aniline-functionalized activated carbon powder was obtained. NaOH and ethylene glycol were mixed at a mass ratio of 1:100 and stirred thoroughly for 10 minutes. After the NaOH was fully dissolved, an ethylene glycol alkaline solution was obtained. Then, chloroplatinic acid and Vulcan XC-72 were added sequentially at a mass ratio of 12:12 (Pt to surface-functionalized activated carbon powder), so that the total mass ratio of chloroplatinic acid and surface-functionalized activated carbon powder to the ethylene glycol alkaline solution was 1:1000. The resulting mixture was stirred and refluxed at 160°C for 4 hours. After the solution cooled to room temperature, the pH was adjusted to 4 with H2SO4, and stirring was continued for 12 hours. Finally, the reactants were filtered, washed with ethanol, dried, ground, and placed in a muffle furnace for heat treatment at 400°C for 60 minutes to obtain a highly dispersed carbon-supported Pt catalyst with approximately 40% noble metal Pt.

[0043] Figure 2 The image shows a transmission electron microscope (TEM) image of the prepared sample. Pt nanoparticles are uniformly dispersed on the carbon black support, with an average particle size of 2.2 nm. The particles are evenly distributed and there is no obvious agglomeration.

[0044] Example 3:

[0045] Benzothioethanol was dissolved in methanol at a mass ratio of 1:10 and sonicated for 10 minutes to ensure uniform dispersion. Then, commercial activated carbon Ketjen black was mixed with the solution at a mass ratio of 1:10, sonicated for 60 minutes, and then refluxed at 60°C for 10 hours. Finally, after filtration, washing, and drying, benzenethioethanol-functionalized activated carbon powder was obtained. NaOH and ethylene glycol were mixed at a mass ratio of 1:100 and stirred thoroughly for 10 minutes. After the NaOH was fully dissolved, an ethylene glycol alkaline solution was obtained. Then, potassium chloroplatinate and Ketjen black were added sequentially at a mass ratio of 28:12 (Pt to surface-functionalized activated carbon powder), ensuring that the total mass ratio of potassium chloroplatinate and surface-functionalized activated carbon powder to the ethylene glycol alkaline solution was 1:1000. The resulting mixture was stirred and refluxed at 160°C for 4 hours. After the solution cooled to room temperature, the pH was adjusted to 4 with H2SO4, and stirring was continued for 12 hours. Finally, the reactants were filtered, washed with ethanol, dried, ground, and placed in a muffle furnace for heat treatment at 400°C for 60 minutes to obtain a highly dispersed carbon-supported Pt catalyst with approximately 70% noble metal Pt.

[0046] Figure 3The image shows a transmission electron microscope (TEM) image of the prepared sample. Pt nanoparticles are uniformly dispersed on the carbon black support, with an average particle size of 2.8 nm. The particles are evenly distributed and there is no obvious agglomeration.

[0047] Example 4:

[0048] Benzoic acid was dissolved in methanol at a mass ratio of 1:10 and ultrasonicated for 10 minutes to ensure uniform dispersion. Then, commercial activated carbon Ketjen black was mixed with the solution at a mass ratio of 1:10, ultrasonicated for 60 minutes, and then refluxed at 60°C for 10 hours. Finally, after filtration, washing, and drying, benzoic acid-functionalized activated carbon powder was obtained. NaOH and ethylene glycol were mixed at a mass ratio of 1:100 and stirred thoroughly for 10 minutes. After the NaOH was fully dissolved, an ethylene glycol alkaline solution was obtained. Then, palladium acetate and Ketjen black were added sequentially at a mass ratio of 6:12 (Pd to surface-functionalized activated carbon powder), ensuring that the total mass ratio of palladium acetate and surface-functionalized activated carbon powder to the ethylene glycol alkaline solution was 1:1000. The resulting mixture was stirred and refluxed at 160°C for 4 hours. After the solution cooled to room temperature, the pH was adjusted to 4 with H2SO4, and stirring was continued for 12 hours. Finally, the reactants were filtered, washed with ethanol, dried, ground, and placed in a muffle furnace for heat treatment at 400°C for 60 minutes to obtain a highly dispersed carbon-supported Pd catalyst with approximately 30% noble metal Pd.

[0049] Figure 4 The image shows a transmission electron microscope (TEM) image of the prepared sample. Pd nanoparticles are uniformly dispersed on the carbon black support, with an average particle size of 3 nm. The particles are evenly distributed and there is no obvious agglomeration.

[0050] Example 5:

[0051] 1-Aminopyridine was dissolved in methanol at a mass ratio of 1:10 and ultrasonicated for 10 minutes to ensure uniform dispersion. Then, commercial activated carbon black was mixed with the solution at a mass ratio of 1:10, ultrasonicated for 60 minutes, and then refluxed at 60°C for 10 hours. Finally, after filtration, washing, and drying, 1-aminopyridine-functionalized activated carbon powder was obtained. NaOH and ethylene glycol were mixed at a mass ratio of 1:100 and stirred thoroughly for 10 minutes. After the NaOH was fully dissolved, an ethylene glycol alkaline solution was obtained. Then, palladium acetylacetonate and surface-functionalized activated carbon black were added sequentially at a mass ratio of 12:12 (Pd to surface-functionalized activated carbon powder), so that the total mass ratio of palladium acetylacetonate and surface-functionalized activated carbon powder to the ethylene glycol alkaline solution was 1:1000. The resulting mixture was stirred and refluxed at 160°C for 4 hours. After the solution cooled to room temperature, the pH was adjusted to 4 with H2SO4, and stirring was continued for 12 hours. Finally, the reactants were filtered, washed with ethanol, dried, ground, and placed in a muffle furnace for heat treatment at 400°C for 60 minutes to obtain a highly dispersed carbon-supported Pd catalyst with approximately 50% noble metal Pd.

[0052] Figure 5 The image shows a transmission electron microscope (TEM) image of the prepared sample. Pd nanoparticles are uniformly dispersed on the carbon black support, with an average particle size of 3.8 nm. The particles are evenly distributed and there is no obvious agglomeration.

[0053] Example 6:

[0054] Benzothioethanol was dissolved in methanol at a mass ratio of 1:10 and sonicated for 10 minutes to ensure uniform dispersion. Then, commercial activated carbon, Ketjen black, was mixed with the solution at a mass ratio of 1:10 and sonicated for 60 minutes. The mixture was then stirred and refluxed at 60°C for 10 hours. Finally, after filtration, washing, and drying, benzenethioethanol-functionalized activated carbon powder was obtained. NaOH and ethylene glycol were mixed at a mass ratio of 1:100 and stirred thoroughly for 10 minutes. After the NaOH was fully dissolved, an ethylene glycol alkaline solution was obtained. Then, palladium nitrate and Ketjen black were added sequentially at a mass ratio of 18:12 (Pd to surface-functionalized activated carbon powder), ensuring that the total mass ratio of palladium nitrate and surface-functionalized activated carbon powder to the ethylene glycol alkaline solution was 1:1000. The resulting mixture was stirred and refluxed at 160°C for 4 hours. After the solution cooled to room temperature, the pH was adjusted to 4 with H2SO4, and stirring was continued for 12 hours. Finally, the reactants were filtered, washed with ethanol, dried, ground, and placed in a muffle furnace for heat treatment at 400°C for 60 minutes to obtain a highly dispersed carbon-supported Pd catalyst with approximately 60% noble metal Pd.

[0055] Figure 6The image shows a transmission electron microscope (TEM) image of the prepared sample. Pd nanoparticles are uniformly dispersed on the carbon black support, with an average particle size of 4.3 nm. The particles are evenly distributed and there is no obvious agglomeration.

[0056] This specific embodiment utilizes small organic molecules containing functional groups such as amino, carboxyl, and thiol groups to anchor the surface of activated carbon. By leveraging the anchoring effect of these functional groups on noble metal nanoparticles, the metal-support interaction is enhanced, leading to the overgrowth of noble metal ions during reduction and nucleation processes, ultimately forming a small-sized, highly dispersed, and highly loaded carbon-supported noble metal catalyst. This method is an improvement on the traditional impregnation + alcoholic reduction method, therefore requiring no additional equipment and featuring a simple preparation method with low equipment requirements, making it easy to achieve industrial production. The catalyst obtained by this invention has noble metal particles with diameters between 0.5 and 4 nanometers, uniform particle dispersion, uniform size, and no agglomeration, with a noble metal loading of up to 70%.

[0057] In summary, this invention utilizes benzoic acid, aniline, benzenethiol, and 1-aminopyridine to surface-functionalize an activated carbon support. The carboxyl, amino, and thiol functional groups in these small organic molecule compounds can form anchor points on the activated carbon support. During the subsequent alcoholic reduction of noble metal ions, these anchor points can enhance the metal-support interaction by anchoring the formed catalyst nanoparticles, thereby inhibiting the growth and aggregation of nanoparticles in the subsequent process and ensuring their uniform dispersion on the carbon support. This results in a small-sized, high-load carbon-supported noble metal catalyst, significantly improving the catalyst's catalytic performance and lifespan.

[0058] It should be emphasized that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a highly dispersed, high-loading carbon-supported platinum and palladium noble metal catalyst, characterized in that, The following steps are involved: Step 1: Mix the functional organic compound and methanol at a mass ratio of 1:8-12, and disperse them evenly by ultrasonication to obtain mixture A; add the carbon support to mixture A, wherein the mass ratio of carbon support to mixture is 1:8-12; ultrasonically treat the mixture for 50-70 minutes, and then stir and reflux at 55-65℃ for 8-12 hours; finally, after filtration, washing and drying, obtain surface-functionalized activated carbon powder B. Step 2: Mix NaOH and ethylene glycol at a mass ratio of 1:90-110 and stir thoroughly to obtain mixed solution C; Step 3: Add Pt salt or Pd salt and activated carbon powder B to mixed solution C. The mass ratio of Pt metal in Pt salt or Pd metal in Pd salt to activated carbon powder B is 1-30:12; the total mass ratio of Pt salt or Pd salt and activated carbon powder B to mixed solution C is 1:900-1100. Stir and reflux the resulting mixture at 150-170℃ for 3-5 hours. After the solution cools to room temperature, adjust the pH to 3.9-4.1 with H2SO4 and continue stirring for 10-14 hours. Finally, filter the reactants, wash with ethanol, and dry to obtain catalyst precursor powder D. Step 4: Grind and heat-treat the catalyst precursor powder D at 380-420℃ for 50-70 minutes to obtain a highly dispersed, high-load carbon-supported platinum and palladium noble metal catalyst. The method for preparing the highly dispersed, high-load carbon-supported platinum and palladium noble metal catalyst is characterized in that, in step 1, the functional organic compound includes: benzoic acid, aniline, benzenethiol, and 1-aminopyridine. In step 3, the Pt salt includes: chloroplatinic acid H2PtCl6, potassium chloroplatinate K2PtCl4, and platinum acetylacetonate; the Pd salt includes: palladium acetate, palladium nitrate, and palladium acetylacetonate.

2. The method for preparing the highly dispersed, high-loading carbon-supported platinum and palladium noble metal catalyst according to claim 1, characterized in that, In step 1, the functional organic compound and methanol are mixed at a mass ratio of 1:

10.

3. The method for preparing the highly dispersed, high-loading carbon-supported platinum and palladium noble metal catalyst according to claim 1, characterized in that, In step 1, the carbon support includes: Vulcan XC-72 and Ketjen Black.

4. The method for preparing the highly dispersed, high-loading carbon-supported platinum and palladium noble metal catalyst according to claim 1, characterized in that, In step 1, the mass ratio of the carbon support to the mixture A is 1:

10. The mixture is ultrasonically treated for 60 minutes and then stirred and refluxed at 60°C for 10 hours.

5. The method for preparing the highly dispersed, high-loading carbon-supported platinum and palladium noble metal catalyst according to claim 1, characterized in that, In step 3, the mass ratio of Pt metal in the Pt salt or Pd metal in the Pd salt to activated carbon powder B is 3-28:

12.

6. The method for preparing the highly dispersed, high-loading carbon-supported platinum and palladium noble metal catalyst according to claim 1, characterized in that, In step 4, the catalyst precursor powder D is heat-treated at a temperature of 400°C for 60 minutes.

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