Metal monatomic catalyst and preparation method thereof

A catalyst and metal technology, applied in the field of metal single-atom catalysts and their preparation, can solve the problems of single-atom metal species, poor stability, long process, etc., and achieve the effects of improving catalytic performance, preventing shedding and easy operation.

Active Publication Date: 2020-07-17
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a metal single-atom catalyst, which aims to solve the problem that the preparation method of a metal single-atom catalyst has a long process and requires the use of toxic precursors and Technical problems such as toxic solvents, monoatomic metal species prepared, poor stability, etc.

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  • Metal monatomic catalyst and preparation method thereof
  • Metal monatomic catalyst and preparation method thereof
  • Metal monatomic catalyst and preparation method thereof

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preparation example Construction

[0043]The embodiment of the present invention provides a method for preparing a metal single-atom catalyst, comprising the following steps:

[0044] S10. Under the first protective gas atmosphere, laser treatment is performed on the mixed solution containing the metal material and the dispersant to obtain a mixed metal single atom solution;

[0045] S20. Mixing the metal single atom mixed solution with the base material and performing a hydrothermal reaction to obtain a precursor loaded with a metal single atom;

[0046] S30. Under the atmosphere of the second protective gas, the precursor is mixed with the nitrogen-containing compound and then sintered to obtain a nitrogen-doped metal single-atom catalyst.

[0047] The preparation method of the metal single-atom catalyst provided by the embodiment of the present invention is to carry out laser treatment on the mixed solution containing the metal material and the dispersant, so that the metal material enters the solution in th...

Embodiment 1

[0071] A metal single-atom catalyst comprising the following preparation steps:

[0072] 1) Put the cobalt metal block into 30ml ethanol solution containing 0.1wt% block polymer P123.

[0073] 2) The solution is fed with excess argon.

[0074] 3) A visible laser with a laser power of 30w irradiates the surface of metal cobalt, so that cobalt atoms enter the solution, and the irradiation time is 0.2h.

[0075] 4) The metal monoatomic dispersed solution was mixed with ZIF-8 by ultrasonic, and reacted in a high-pressure reactor at 80° C. for 5 hours. Centrifugal separation to obtain the ZIF-8 precursor loaded with cobalt single atom;

[0076] 5) After the precursor material is mixed with 20wt% ammonium chloride, it is calcined at 400°C for 2 hours under an argon atmosphere, and finally a metal single-atom catalyst Co-N-C can be obtained. The mass percentage of cobalt atoms is shown in Table 1. The obtained catalyst can be used at 0.1mol / LHClO 4 solution to test the oxygen red...

Embodiment 2

[0078] A metal single-atom catalyst comprising the following preparation steps:

[0079] 1) The cobalt metal powder is placed in a 50ml ethanol solution containing 5wt% P127.

[0080] 2) The solution is fed with excess nitrogen.

[0081] 3) A visible laser with a laser power of 100w irradiates the surface of metal cobalt, so that cobalt atoms enter the solution, and the irradiation time is 0.5h.

[0082] 4) Stir and mix the solution of metal monatomic dispersion with activated carbon, and react in a high-pressure reactor at 120° C. for 6 hours. Centrifugal separation to obtain an activated carbon precursor loaded with cobalt single atoms;

[0083] 5) After the precursor material is mixed with 0.1wt% ammonium nitrate, it is calcined at 1200°C for 5h under an argon atmosphere, and finally the metal single-atom catalyst Co-N-C can be obtained. The mass percentage of cobalt atoms is shown in Table 1. The obtained catalyst can be used Test the oxygen reduction performance in 0.1...

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Abstract

The invention belongs to the technical field of catalysts, and particularly relates to a preparation method of a metal monatomic catalyst, which comprises the following steps: in a first protective gas atmosphere, carrying out laser treatment on a mixed solution containing a metal material and a dispersing agent to obtain a metal monatomic mixed solution; mixing the metal single atom mixed solution with a substrate material, and then carrying out hydrothermal reaction to obtain a precursor loaded with metal single atoms; and in a second protective gas atmosphere, mixing the precursor with a nitrogen-containing compound, and sintering to obtain the nitrogen-doped metal monatomic catalyst. According to the preparation method of the metal monatomic catalyst, the metal monatomic catalyst can be obtained only through simple laser treatment, hydrothermal reaction and sintering treatment; the metal monatomic active site catalysis is achieved, the catalytic performance of the material is improved, operation is easy, and industrial large-scale production and application are easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a metal single-atom catalyst and a preparation method thereof. Background technique [0002] As chemical and chemical products are widely used in human life, the development of industrial chemistry plays an increasingly important role in social and technological progress. Catalyst has the advantages of increasing chemical reaction rate, reducing reaction cost, increasing yield and saving reaction time, so catalyst is the core material of industrial chemistry. Metal single-atom catalysts use metal single-atom sites to improve catalytic activity. Metal single-atom catalysts are highly efficient catalysts that maximize metal utilization, so they have the advantages of low cost and high catalytic activity. The metal single atom in the metal single-atom catalyst does not exist in the form of metal valence, but forms an M-N-C or M-O covalent bond with the substrate material, so the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/75B01J27/22B01J27/04C01B3/04C07C5/09C07C11/04C25B11/06
CPCB01J27/24B01J23/75B01J27/22B01J27/04B01J35/004B01J35/0033C01B3/042C07C5/09C07C2527/24C25B11/091C25B11/075C07C11/04Y02E60/36Y02P20/52
Inventor 徐保民钟熊伟
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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