Search

KR-20260067606-A - THE METHOD OF MANUFACTURING METAL-IMPREGNATED ACTIVATED CARBON ADSORBENT FOR HYDROGEN STORAGE

KR20260067606AKR 20260067606 AKR20260067606 AKR 20260067606AKR-20260067606-A

Abstract

The object of the present invention is to provide a method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage having a hierarchical porous structure with introduced platinum (Pt) particles and improved hydrogen storage performance at room temperature. To achieve the above objective, the present invention comprises: (a) a step of manufacturing activated carbon; (b) a step of mixing a dispersion containing the activated carbon and a solution containing a platinum precursor and evaporating the solvent to obtain a mixture; (c) a step of performing a first heat treatment on the mixture; and (d) a step of performing a second heat treatment on the mixture that has undergone the first heat treatment.

Inventors

  • 배윤상
  • 이승진

Assignees

  • 국방과학연구소

Dates

Publication Date
20260513
Application Date
20241106

Claims (18)

  1. (a) A step of manufacturing activated carbon; (b) a step of mixing a dispersion containing the activated carbon and a solution containing a platinum precursor and evaporating the solvent to obtain a mixture; (c) a step of primary heat treating the above mixture; and (d) a step of performing a second heat treatment on the mixture heat-treated first above; comprising, Method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage.
  2. In paragraph 1, The above step (a) is characterized by including the step of mixing melamine, terephthalaldehyde, and potassium hydroxide (KOH) and heat-treating them. Method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage.
  3. In paragraph 2, Characterized by mixing the melamine, terephthalaldehyde, and potassium hydroxide in a weight ratio of 1:1:5 to 1.5:1.5:5. Method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage.
  4. In paragraph 2, The above heat treatment is characterized by being performed under conditions of an argon atmosphere, 800 to 850°C, and 3 to 4 hours. Method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage.
  5. In paragraph 1, The above step (a) is characterized by including a step of removing unreacted material, Method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage.
  6. In paragraph 1, The above step (a) is characterized by including a step of washing with distilled water and drying, Method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage.
  7. In paragraph 1, In step (b) above , the platinum precursor is platinum chloride hydrate ( H₂PtCl₆ · xH₂O ), and Characterized by mixing 5 to 15 weight percent of platinum with respect to 100 weight percent of the activated carbon. Method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage.
  8. In paragraph 1, The solution containing the platinum precursor in step (b) above is added to the dispersion containing the activated carbon drop by drop at intervals of 15 to 20 seconds. Method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage.
  9. In paragraph 1, The above step (c) is characterized by heat treatment under conditions of an argon atmosphere, 45 to 50°C, and 1.5 to 2 hours. Method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage.
  10. In paragraph 1, The above step (d) is characterized by heat treatment under conditions of a hydrogen and argon atmosphere, 140 to 150°C, and 1 to 1.5 hours. Method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage.
  11. Manufactured by the method of any one of paragraphs 1 to 10, Metal-impregnated activated carbon adsorbent for hydrogen storage.
  12. In Paragraph 11, The above adsorbent is characterized by having a hierarchical porous structure, Metal-impregnated activated carbon adsorbent for hydrogen storage.
  13. In Paragraph 11, Characterized by the hydrogen adsorption capacity (n excess ) of the above adsorbent being 0.38 to 0.46 weight% under conditions of 298K and 40 bar, Metal-impregnated activated carbon adsorbent for hydrogen storage.
  14. In Paragraph 11, Characterized by the hydrogen adsorption capacity (n total ) of the above adsorbent being 1.0 to 1.35 weight% under conditions of 298K and 40 bar, Metal-impregnated activated carbon adsorbent for hydrogen storage.
  15. In Paragraph 11, Characterized by the fact that the BET surface area of the above adsorbent is 2550 to 3350 m² /g, Metal-impregnated activated carbon adsorbent for hydrogen storage.
  16. In Paragraph 11, Characterized by the fact that the pore volume of the above adsorbent is 2 to 3 cc/g, Metal-impregnated activated carbon adsorbent for hydrogen storage.
  17. In Paragraph 11, The platinum particle size of the above adsorbent is 2 to 3 nm, and The above platinum particles are characterized by inducing a spillover phenomenon. Metal-impregnated activated carbon adsorbent for hydrogen storage.
  18. In Paragraph 11, Characterized by the ratio of Pt 0 : Pt 2+ of platinum impregnated in the above adsorbent being 7:3, Metal-impregnated activated carbon adsorbent for hydrogen storage.

Description

Method of manufacturing metal-impregnated activated carbon adsorbent for hydrogen storage The present invention relates to a method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage. Hydrogen is the most abundant element on Earth, possesses a high gravimetric energy density (120 MJ/kg), and is gaining attention as the most promising clean energy source to replace fossil fuels because it emits no byproducts other than water during combustion. However, hydrogen exists in a gaseous state at room temperature and pressure, and due to its very low density (0.0838 kg/ m³ ), it requires a much larger volume compared to other energy sources to store the same amount of energy. To store hydrogen at a meaningful level, very harsh conditions such as high pressure and cryogenic temperatures are required to increase storage density, which leads to the need for high-performance storage tanks and complex cooling systems. These conditions, combined with the high cost and the flammability and explosiveness of hydrogen, result in high-risk systems and are factors that hinder the development of the hydrogen economy. Existing hydrogen storage methods include high-pressure gas storage, low-temperature liquid storage, physisorption, chemiosorption, and liquid organic compound storage; among these, hydrogen storage utilizing porous materials based on adsorption mechanisms is attracting attention for its efficiency. Materials for hydrogen adsorption include porous carbon, metal-organic frameworks (MOFs), and zeolites. In particular, activated carbon is cost-effective, and because it enables efficient hydrogen storage by allowing the production of activated carbon with highly developed pore structures and ultra-high specific surface areas through chemical activation using activating agents during the synthesis process, it is advantageous for commercialization. Meanwhile, even when using ultra-high specific surface area activated carbon, hydrogen storage based solely on physical adsorption is based on low heat of adsorption (<10 kJ/mol), making a cryogenic environment unavoidable for a significant amount of hydrogen storage, which poses a problem of causing a serious energy penalty for hydrogen storage. Furthermore, since this is somewhat different from the conditions of the hydrogen storage target (6.5 wt%, -40 to 85 ℃) announced by the U.S. Department of Energy (DOE), there is a need for strategies to efficiently store hydrogen under mild conditions. Accordingly, through strenuous efforts and various studies, the applicant has devised a method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage having a hierarchical porous structure with introduced platinum (Pt) particles and improved hydrogen storage performance at room temperature. FIG. 1 is a Fourier transform infrared spectrometer (FT-IR) graph of Preparation Example 1 of the method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage according to one embodiment of the present invention. FIG. 2 is an SEM image of Preparation Example 1 of a method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage according to one embodiment of the present invention. FIG. 3 is a powder X-ray diffraction diagram of Preparation Example 1 and Examples 1 to 3 of a method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage according to one embodiment of the present invention. FIG. 4 is a graph of the nitrogen adsorption isotherms and pore size distributions of Preparation Example 1 and Examples 1 to 3 of the method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage according to one embodiment of the present invention. FIG. 5 is a TEM image of Examples 1 to 3 of the method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage according to one embodiment of the present invention. FIG. 6 is the XPS spectrum of Preparation Example 1 and Examples 1 to 3 of the method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage according to one embodiment of the present invention. FIG. 7 is a graph of the hydrogen adsorption capacity at (a) low temperature and low pressure (77 K, 1 bar) and (b) room temperature and high pressure (298 K, 70 bar) of Preparation Example 1 and Examples 1 to 3 of the method for manufacturing a metal-impregnated activated carbon adsorbent for hydrogen storage according to one embodiment of the present invention. FIG. 8 is a graph showing the hydrogen storage performance of a metal-impregnated activated carbon adsorbent for hydrogen storage according to one embodiment of the present invention, Manufacturing Example 1, Examples 1 to 3, and a previously reported metal-introduced adsorbent under room temperature and high pressure conditions. Before describing the present invention in detail, it should be understood that the