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Catalyst for electrochemical synthesis of ammonia based on graphene quantum dots and preparation method thereof

A technology of graphene quantum dots and catalysts, applied in the direction of electrodes, electrolytic components, electrolytic processes, etc., can solve problems such as difficult to meet practical applications, short service life, high price, etc., and achieve production conditions that are easy to achieve, low in cost, and good in quality Effect

Active Publication Date: 2020-01-21
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Noble metal catalysts have excellent catalytic performance, but they are easily poisoned and have a short service life, especially expensive, which is difficult to meet the requirements of practical applications.
Although non-precious metal catalysts have a great cost advantage, the catalytic performance remains to be further studied

Method used

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  • Catalyst for electrochemical synthesis of ammonia based on graphene quantum dots and preparation method thereof
  • Catalyst for electrochemical synthesis of ammonia based on graphene quantum dots and preparation method thereof
  • Catalyst for electrochemical synthesis of ammonia based on graphene quantum dots and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: the preparation of graphene quantum dot

[0031] The preparation method of graphene quantum dots comprises the following steps: ① take graphite powder block and mechanically mix it with molten salt catalyst; ② take the mixed material in step ①, preheat and keep it warm; ③ take the mixed material in step ② after heat preservation and directly heat up and heat preservation; ④ cooling the mixture in step ③ to room temperature, soaking in water to obtain the suspension; ⑤ taking the suspension in step ④, and obtaining the graphene quantum dot product through centrifugal filtration.

[0032] In step ①, the mass ratio of graphite powder block to molten salt catalyst is 1:2 to 1:8, preferably 1:5 in this embodiment.

[0033] In step ①, the graphite powder block is industrial grade graphite powder. The ash content of the graphite powder block in this embodiment is not more than 0.05, the moisture content is not higher than 0.02, the carbon content is more than 99%...

Embodiment 2

[0039] Embodiment 2: Preparation of boron nitride quantum dots

[0040] The preparation method of boron nitride quantum dots, the raw material is hexagonal boron nitride, and the rest are the same as in embodiment 1.

[0041] Result analysis:

[0042] figure 1 It is the electron micrograph of the raw material graphite powder block and boron nitride, the macroscopic picture of the product solution and the schematic diagram of the reaction.

[0043] Depend on figure 1 It can be seen that the schematic preparation process of graphene quantum dots and boron nitride quantum dots. Diluted GQDS (5 mg / ml) was transparent with black particles in suspension. The low water solubility and metallic luster indicate that it has less hydrophilic functional groups, which is completely different from the previously reported carbon quantum dots (CQDS). BNQDs (5mg / ml) showed a milky white color. Both GQDs and BNQDs tend to precipitate and aggregate. This is the result of a small amount of ...

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Abstract

The invention relates to the field of graphene quantum dots, in particular to a preparation method of an ammonia electrochemical synthesis catalyst based on graphene quantum dots. The preparation method includes the steps of firstly, mechanically mixing graphite powder lumps and a fused-salt catalyst, wherein the fused-salt catalyst is the mixture of cesium carbonate fused salt and fused salt containing iron and molybdenum; secondly, subjecting the mixture obtained in the first step to thermal treatment and heat preservation; thirdly, directly heating the mixture obtained after the heat preservation in the second step, and performing heat preservation; fourthly, cooling the mixture obtained after the third step to room temperature, and soaking with water to obtain a suspension; fifthly, subjecting the suspension obtained in the fourth step to centrifugal filtering to obtain the ammonia electrochemical synthesis catalyst. The ammonia electrochemical synthesis catalyst is low in preparation cost, high in graphitization degree, good in quality, high in ammonia synthesis catalytic efficiency and applicable to large-scale production.

Description

technical field [0001] The invention relates to the field of graphene quantum dots, in particular to a catalyst for electrochemical synthesis of ammonia based on graphene quantum dots and a preparation method thereof. Background technique [0002] Ammonia is an important chemical and energy material. Nitrogen atom is an important constituent element of biomolecules, so it is a necessary component of medicines and fertilizers. At the same time, nitrogen atom is also widely used in non-biological fields such as dyes, explosives and resins, and the preparation of the above substances requires ammonia as a raw material; ammonia gas Cracking can produce hydrogen, so ammonia is also widely used as a hydrogen storage material in the energy field. [0003] The synthesis of ammonia from nitrogen in the air is known as the greatest scientific progress in the 20th century, and more than 1% of the earth's total energy is used to synthesize ammonia every year. At present, the most impo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/06C25B1/00
Inventor 孙成华徐勇军
Owner DONGGUAN UNIV OF TECH
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