A kind of method for preparing single-atom-like catalyst

A catalyst and atom technology, applied in the field of materials science and engineering, can solve the problems of single atom catalyst and reaction substrate size mismatch, lack of electron or space synergy, single metal atom small size, etc., to meet the requirements of experimental diversification , achieve precise and controllable effects, and reduce experimental requirements

Active Publication Date: 2021-05-04
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on the fact that the volume of a single metal atom in a single-atom catalyst is too small, the isolated single-atom site lacks electronic or steric synergy, and in some reactions, it limits the rate increase. The method of atomic catalysts to solve the problem that single-atom catalysts do not match the size of the reaction substrate and cannot form good contacts

Method used

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  • A kind of method for preparing single-atom-like catalyst
  • A kind of method for preparing single-atom-like catalyst
  • A kind of method for preparing single-atom-like catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Preparation of organic cryptand molecules: Weigh an appropriate amount of tris(2-aminoethyl)amine and m-phthalaldehyde into a round-bottomed flask filled with acetonitrile solution, stir until completely dissolved, then mix, and continue stirring for a certain period of time. Filtration and washing yielded an intermediate product. Finally, through reduction, extraction, drying and other steps to obtain organic cryptand molecular products (such as figure 1 ).

[0034] transition metal precursors (such as figure 2 ) preparation: Weigh an appropriate amount of organic cryptand molecules and copper perchlorate hexahydrate and dissolve them in acetonitrile solution, mix and stir for a certain period of time after complete dissolution, and obtain copper precursor products after filtering, washing and drying.

[0035] Weigh 0.02g of the mixture of copper precursor and 1g of carbon black and add it into a 50mL agate ball mill jar, put some agate balls in the jar, put the aga...

Embodiment 2

[0037] Preparation of organic cryptand molecules: Weigh an appropriate amount of tris(2-aminoethyl)amine and m-phthalaldehyde into a round-bottomed flask filled with acetonitrile solution, stir until completely dissolved, then mix, and continue stirring for a certain period of time. Filtration and washing yielded an intermediate product. Finally, the organic ligand molecular product is obtained through reduction, extraction, drying and other steps.

[0038] Preparation of transition metal precursors: Weigh appropriate amount of organic ligand molecules and copper perchlorate hexahydrate and dissolve them in acetonitrile solution, mix and stir for a certain period of time after complete dissolution, and obtain copper precursor products after filtration, washing and drying.

[0039] Weigh 0.06g of the mixture of copper precursor and 3 g of carbon black and add it into a 100mL agate ball mill jar, put a number of agate balls in the jar, put the agate ball mill jar into the planet...

Embodiment 3

[0041] Preparation of organic cryptand molecules: Weigh an appropriate amount of tris(2-aminoethyl)amine and m-phthalaldehyde into a round-bottomed flask filled with acetonitrile solution, stir until completely dissolved, then mix, and continue stirring for a certain period of time. Filtration and washing yielded an intermediate product. Finally, the organic ligand molecular product is obtained through reduction, extraction, drying and other steps.

[0042] Preparation of transition metal precursors: Weigh appropriate amount of organic ligand molecules and copper perchlorate hexahydrate and dissolve them in acetonitrile solution, mix and stir for a certain period of time after complete dissolution, and obtain copper precursor products after filtration, washing and drying.

[0043] Weigh 0.2g of the mixture of copper precursor and 10g of carbon black and add it into a 250mL agate ball mill jar, put some agate balls in the jar, put the agate ball mill jar into the planetary ball...

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Abstract

The invention discloses a method for preparing a single-atom-like catalyst, which comprises the following steps: the first step, the preparation of a transition metal precursor: weighing an organic amine and a substituted benzaldehyde into an acetonitrile solution to obtain an intermediate product; Reduction, extraction, and drying steps to obtain organic ligand molecular products; organic ligand molecules and transition metal salts were dissolved in acetonitrile solution, and after complete dissolution, continue to mix and stir, and obtain transition metal precursor products after filtering, washing, and drying; The second step is mechanical ball milling: use high-energy mechanical ball milling to disperse transition metal precursors in carbon black with a high specific surface area to obtain single-atom catalyst precursors; the third step is high-temperature calcination to obtain corresponding single-atom catalysts. The invention realizes the preparation of the transition metal-based single-atom catalyst material, has good expandability and reproducibility, and solves the problems of low metal content, few types, complicated preparation methods and the like in the prior art.

Description

technical field [0001] The invention belongs to the technical field of material science and engineering, and in particular relates to a method for preparing a single-atom-like catalytic material. Background technique [0002] Single-atom catalysts refer to catalysts with excellent performance formed by uniformly dispersing metal active components on the surface of a support in the form of single atoms. Because of its high catalytic activity, easy separation, good selectivity, uniform and isolated metal active sites, and high utilization of metal active components. Since academician Zhang Tao of Dalian Institute of Chemical Physics first proposed the concept of "single-atom catalyst" in 2011, it has been greatly developed and has become a research hotspot in the field of heterogeneous catalysis. The common preparation methods of single-atom catalysts include coprecipitation method, impregnation method, atomic layer deposition method and so on. In recent years, with the cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24
CPCB01J27/24
Inventor 何晓辉纪红兵张颖陈虹宇
Owner SUN YAT SEN UNIV
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