Preparation method of defective graphene anchored double transition metal monatomic synthesis ammonia catalyst

A transition metal and graphene technology, applied in the electrolysis process, electrodes, electrolysis components, etc., can solve problems such as the inability to obtain catalytic performance, and achieve the effect of broadening the field of catalyst preparation, improving catalyst activity, and enhancing catalyst activity.

Active Publication Date: 2021-08-10
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, single-atom catalysts still cannot achieve better

Method used

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  • Preparation method of defective graphene anchored double transition metal monatomic synthesis ammonia catalyst
  • Preparation method of defective graphene anchored double transition metal monatomic synthesis ammonia catalyst
  • Preparation method of defective graphene anchored double transition metal monatomic synthesis ammonia catalyst

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1

[0030] 1.8 g of polyvinylpyrrolidone, 18 g styrene, 0.3 g of azo diisobutyronitrile was added to 80 ml of ethanol and 20 ml of water mixing liquid, and stirred under a nitrogen in oxygen, stirred 12 h, and the product was centrifuged and dried in vacuo to obtain polybenzene. Ethylene microspheres, polystyrene microspheres SEM pictures figure 1 ,from figure 1 It can be seen in that the microsphere size is one, the dispersion is uniform;

[0031] 1 g of polystyrene microspheres were added to 10 mmol / l chloride solutions, and the mixture was mixed at room temperature for 12 h, and the extra chlorinated hemoxin was centrifuged.

[0032] 1 g of polystyrene microspheres with hemoxyl chloride were stirred with 5 mg / ml defective oxide in graphene aqueous solution 24 h, forming polystyrene microspheres as a core, defective oxide oxide as a composite structure, centrifugation, vacuum drying Get defective oxide oxide coated polystyrene microspheres, defective oxide in ...

Example Embodiment

[0034] Example 2

[0035] 1.8 G Polyvinylpyrrolidone, 15 g of styrene, 0.2 g of azo diisobutyronitrile were added to 10 ml of ethanol and 10 ml of water mixed liquid, stirred under a nitrogen removal 12 h, and the product was centrifuged and dried. Styrene microspheres, polystyrene microspheres SEM pictures Image 6 ,from Image 6 It can be seen in that the polystyrene microspheres are uniform, smooth and dimensions;

[0036] 1 g of polystyrene microspheres were added to 20 mmol / L phthalocyanine in iron solution, and stirred at room temperature for 12 h, and eliminated excess phthalocyanine solution;

[0037] 1g Polyphenylene microspheres of the iron phthalocyanine solution were stirred at 10 mg / ml defective oxide in graphene aqueous solution 24 h, forming polystyrene microspheres as a core, defective oxidation graphene as a composite structure, centrifugation, vacuum drying Deficient oxide oxide coated polystyrene microspheres, defective oxide in graphene coated polystyrene micro...

Example Embodiment

[0039] Example 3

[0040] Embodiments Example 1, only the first transition metal complex is replaced with tetramonide copper, and the synthetic ammonia rate can be as high as 18.3 μg · h. -1 · Mg -1 cat Faraday efficiency is as high as 9.1%.

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Abstract

The invention discloses a preparation method of a defective graphene anchored double transition metal monatomic synthesis ammonia catalyst, and the preparation method comprises the following steps: synthesizing polystyrene microspheres, centrifugally washing, and drying in vacuum; stirring and adsorbing the polystyrene microspheres and a transition metal salt solution; stirring the polystyrene microspheres adsorbing the transition metal salt with a defective graphene oxide aqueous solution to form a composite structure taking the polystyrene microspheres as a core and the defective graphene oxide as a shell, performing centrifuging, and performing drying in vacuum; dispersing the sample in an aqueous solution, adding a small amount of another transition metal salt solution, carrying out ultrasonic dispersion, performing freeze-drying, and carrying out high-temperature annealing to obtain a final product. According to the invention, polystyrene microspheres are utilized to adsorb a first transition metal salt, so the first transition metal salt is distributed in an inner shell layer of defective graphene oxide; a second transition metal salt is loaded by utilizing a defective graphene oxide shell layer, and the polystyrene microspheres are removed by utilizing high-temperature annealing to form a structure that the defective graphene hollow inner shell layer and the defective graphene hollow shell layer are respectively loaded with two double-transition metal monatomic structures.

Description

technical field [0001] The invention relates to the field of electrocatalytic synthesis of ammonia at room temperature, in particular to the preparation of core-shell defect graphene hollow microspheres by a template method, and double-transition metal single atoms are loaded on both sides of the defect graphene hollow microspheres, and the obtained catalyst is electrolyzed under alkaline conditions It has high synthetic ammonia yield and faradaic efficiency. Background technique [0002] Due to its large specific surface area, high electrical conductivity, adjustable molecular structure, and acid / alkali resistance, graphene has been used in sensors, batteries, and catalysts in recent years. Graphene can capture a variety of substances through π-π interactions, hydrogen bonds, electrostatic interactions and coordination bonds, including organic pollutants, biopolymers and metal ions. Defective graphene adds more to the advantages of graphene. Multiple binding sites. [000...

Claims

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Application Information

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IPC IPC(8): C25B11/052C25B11/091C25B1/27
CPCC25B1/00
Inventor 陈少娜熊梓林卜梦珂代忠旭
Owner CHINA THREE GORGES UNIV
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