Heteroatom doped cobalt metal catalyst and preparation method thereof

A cobalt metal and catalyst technology, applied in the field of catalyst synthesis, can solve the problems of difficult to maintain stable, difficult to fix active sites, loss of pores, etc., and achieve the effects of improving performance, enriching active centers, and low price

Pending Publication Date: 2020-08-21
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of introducing heteroatoms and metal elements to increase its active sites, the active sites are difficult to fix, easy to lose, and difficult to maintain the pores stably. Additional templates are needed to maintain the shape and other problems.

Method used

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  • Heteroatom doped cobalt metal catalyst and preparation method thereof
  • Heteroatom doped cobalt metal catalyst and preparation method thereof
  • Heteroatom doped cobalt metal catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 220 mg of guanine, add it into a mixed solution of 20 mL of methanol and 20 mL of ethanol, and disperse it uniformly by ultrasonic treatment. Add 440 mg of cobalt nitrate hexahydrate and 620 mg of 2-methylimidazole under magnetic stirring, and stir for 4 hours. After stirring, it was left to stand at room temperature for 24 hours. The product was collected by centrifugation and washed. Then, the product was dried in a vacuum oven at 60° C. overnight to obtain a bright purple powdery solid. Finally, the product was put into a 30mL ceramic crucible, placed in a high-temperature tube furnace, heated to 800°C in a nitrogen atmosphere at a heating rate of 5°C / min, kept at a constant temperature for 2 hours, and allowed to cool naturally to room temperature to obtain nitrogen-doped cobalt Metal catalyst named Co-N-C-1.

[0033] figure 1 It is a scanning electron microscope picture of Co-N-C-1. It can be seen from the figure that the prepared cobalt metal catalyst ha...

Embodiment 2

[0038]Weigh 1g of amino acid, put it in a 30mL ceramic crucible, place it in a high-temperature tube furnace, heat it to 1000°C in a nitrogen atmosphere at a heating rate of 5°C / min, keep the temperature at a constant temperature for 2h, and wait for it to cool naturally to room temperature to obtain biomass based porous carbon materials. Weigh 150 mg of biomass-based porous carbon, add it to a mixed solution of 20 mL of methanol and 20 mL of ethanol, and add 50 mg of F127 as a surfactant, and disperse it uniformly by ultrasonic treatment. Add 146 mg of cobalt nitrate hexahydrate and 164 mg of 2-methylimidazole under magnetic stirring, and stir for 4 hours. After stirring, it was left to stand at room temperature for 24 hours. The product was collected by centrifugation and washed. Then, the product was dried in a vacuum oven at 60° C. overnight to obtain a black powdery solid. Finally, the product was put into a 30mL ceramic crucible, placed in a high-temperature tube furn...

Embodiment 3

[0040] Weigh 220 mg of phospholipids, add to a mixed solution of 20 mL of dimethyl sulfoxide and 20 mL of ethanol, and disperse evenly by ultrasonic treatment. Add 440 mg of cobalt nitrate hexahydrate and 620 mg of 2-methylimidazole under magnetic stirring, and stir for 4 hours. After stirring, it was left to stand at room temperature for 24 hours. The product was collected by centrifugation and washed. Then, the product was dried in a vacuum oven at 60° C. overnight to obtain a bright purple powdery solid. Finally, the product was put into a 30mL ceramic crucible, placed in a high-temperature tube furnace, heated to 800°C in a nitrogen atmosphere at a heating rate of 5°C / min, kept at a constant temperature for 2 hours, and allowed to cool naturally to room temperature to obtain nitrogen-phosphorus-doped The cobalt metal catalyst named Co-N-P-C-1.

[0041] Figure 5 It is the scanning electron micrograph of Co-N-P-C-1. It can be seen from the figure that the prepared coba...

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Abstract

The invention discloses a heteroatom doped cobalt metal catalyst and a preparation method thereof, and belongs to the field of catalyst synthesis technology and application. The method for preparing the cobalt metal catalyst by heteroatom doping comprises the following steps: dispersing and dissolving biomolecules in a solution, sequentially adding a cobalt salt and an organic ligand, stirring, drying, and directly carbonizing at a high temperature to prepare the heteroatom (nitrogen, phosphorus and sulfur) doped cobalt metal catalyst in one step. According to the catalyst disclosed by the invention, the complete morphology is kept; meanwhile, the catalyst has a high specific surface area, a hierarchical porous structure and good methanol resistance and stability; and the preparation method is simple, the raw materials are easy to obtain, the price is low, the obtained catalyst shows remarkable fuel cell cathode oxygen reduction reaction (ORR) activity in an alkaline medium, the good method is provided for exploring the new non-noble metal catalyst material, and a basis is provided for further experimental optimization and industrial production.

Description

technical field [0001] The invention belongs to the technical field of catalyst synthesis, and in particular relates to a heteroatom-doped cobalt metal catalyst and a preparation method thereof. [0002] technical background [0003] With the progress and development of human society, the excessive use of fossil energy has led to increasing environmental problems. The development of green and clean renewable energy is becoming more and more urgent and has become an important issue to be solved in the 21st century. ORR is an important reaction in fuel cells, metal-air batteries, and other energy conversion systems (R. Bashyam, P.A Zelenay, A class of non-precious metal composite catalysts for fuel cells. Nature 443 (2006) 63–66 .). Pt-based catalysts are currently the most effective catalysts, but their further applications are limited due to their high cost, limited reserves, poor durability, and poor resistance to methanol. Therefore, it is necessary to find suitable subst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/00B01J35/10B01J37/08H01M4/90
CPCB01J27/24B01J35/0033B01J35/10B01J37/086H01M4/9083H01M4/9041Y02E60/50
Inventor 温娜张亮林志谋王琪周鑫
Owner FUZHOU UNIV
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