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Method for preparing monoatomic catalysts

A catalyst and atom technology, applied in the field of materials science and engineering, can solve the problems of mismatching the size of single-atom catalysts and reaction substrates, lack of electronic or spatial synergy, and small size of a single metal atom, and meet the requirements of experimental diversification. , to achieve accurate and controllable, reduce the effect of experimental requirements

Active Publication Date: 2018-12-18
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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  • Method for preparing monoatomic catalysts
  • Method for preparing monoatomic catalysts

Examples

Experimental program
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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 and 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 being completely dissolved, 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...

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 filtering, 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 planeta...

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 filtering, 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 monoatomic catalysts. The method comprises the following steps: step 1, preparation of a transition metal precursor: separately weighing and adding organic amine and substituted benzaldehyde into an acetonitrile solution to obtain an intermediate product, carrying out reduction, extraction and drying to obtain an organic ligand molecule product, separately dissolving organic ligand molecules and a transition metal salt in an acetonitrile solution, continuing mixing under stirring complete dissolving, and successively carrying out filtering, washing and drying so as to obtain a transition metal precursor product; step 2, mechanical ball milling: dispersing the transition metal precursor in carbon black with a high specific surface area by usinga high-energy mechanical ball milling process to obtain a monoatomic catalyst precursor; and step 3, carrying out high-temperature calcinations so as to obtain corresponding monoatomic catalysts. Theinvention realizes the preparation of transition metal monoatomic catalyst materials, has good expandability and reproducibility, and solves the problems of low metal content, few varieties and complicated preparation process in the prior art.

Description

technical field [0001] The invention relates to the technical field of material science and engineering, in particular 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 continuous deepe...

Claims

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Application Information

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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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