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Preparation method of high-entropy monatomic catalyst

A catalyst and atomic technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of convenient operation, good single-atom dispersion and stability, and good application prospects

Pending Publication Date: 2022-05-06
HAINAN UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, single-atom catalysts can only realize the controllable preparation of single-atom catalysts with a maximum of two metal elements, and there have been no reports on multi-element catalysts with more than two elements. The main reason is that there are large differences between different metals. Intrinsic properties make it difficult for multiple metals to harmoniously exist on a single support in the form of single atoms

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  • Preparation method of high-entropy monatomic catalyst

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[0026] The present invention provides a kind of preparation method of high-entropy single-atom catalyst, and the method comprises:

[0027] Preparation of different metal precursors: respectively dissolving the first carrier precursor and different metal precursors in an acid solution and evaporating to dryness to obtain mixed materials corresponding to different metal precursors, and sintering the evaporated mixed materials to obtain different metal precursors; there are at least five metal precursors;

[0028] Preparation of high-entropy single-atom catalysts: dissolving the second carrier precursor and the metal precursor in an alkaline buffer solution and stirring for 12-36 hours, suction filtering and drying to obtain the catalyst precursor after the stirring is completed, and the catalyst High-entropy single-atom catalysts can be obtained by sintering the precursors.

[0029] Wherein, the first carrier precursor is a carbonitride, and the first carrier precursor include...

Embodiment 1

[0047] A preparation method of a high-entropy single-atom catalyst, the high-entropy single-atom catalyst is a five-element high-entropy single-atom catalyst (HEASC-FeCoNiCuMn / NC), the preparation method comprising:

[0048] S1. Prepare different metal precursors respectively;

[0049] S11, the preparation of metal precursor Fe: first use hydrochloric acid solution (30ml HCl+120ml ultrapure water) to dissolve melamine (9g) and ferric chloride (0.1g), after melamine and ferric chloride dissolve completely, obtain mixed solution, in Evaporate the mixed solution at 110°C to obtain the mixed material, and then place the evaporated mixed material in a muffle furnace for sintering to obtain the metal precursor Fe; wherein, the temperature of the muffle furnace is 550°C, and the heating rate is 5°C / min, holding time: 120 minutes.

[0050] S12, the preparation of metal precursor Co: first use hydrochloric acid solution (30ml HCl+120ml ultrapure water) to dissolve melamine (9g) and c...

Embodiment 2

[0064] A preparation method of a high-entropy single-atom catalyst, the high-entropy single-atom catalyst is a seven-member high-entropy single-atom catalyst (HEASC-FeCoNiCuMnCrPt / NC), the preparation method comprising:

[0065] S1. Prepare different metal precursors respectively;

[0066] S11, the preparation of metal precursor Fe: first use hydrochloric acid solution (30ml HCl+120ml ultrapure water) to dissolve melamine (9g) and ferric chloride (0.1g), after melamine and ferric chloride dissolve completely, obtain mixed solution, in Evaporate the mixed solution at 110°C to obtain the mixed material, and then place the evaporated mixed material in a muffle furnace for sintering to obtain the metal precursor Fe; wherein, the temperature of the muffle furnace is 550°C, and the heating rate is 5°C / min , Holding time: 120 minutes.

[0067] S12, the preparation of metal precursor Co: first use hydrochloric acid solution (30ml HCl+120ml ultrapure water) to dissolve melamine (9g) a...

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Abstract

The invention discloses a preparation method of a high-entropy monatomic catalyst, which comprises the following steps: preparing different metal precursors: respectively dissolving a first carrier precursor and different metal precursors in an acid solution, evaporating to dryness to obtain mixed materials corresponding to the different metal precursors, and sintering the evaporated mixed materials to obtain the different metal precursors; and preparing the high-entropy monatomic catalyst: dissolving a second carrier precursor and the metal precursor in an alkaline buffer solution, stirring for 12-36 hours, performing suction filtration and drying after stirring to obtain a catalyst precursor, and sintering the catalyst precursor to obtain the high-entropy monatomic catalyst, the preparation method is simple in process and convenient to operate, controllable preparation of the high-entropy monatomic catalyst is realized for the first time, and each metal component shows good monatomic dispersity and stability on a single carrier.

Description

technical field [0001] The invention relates to the technical field of material synthesis, in particular to a preparation method of a high-entropy single-atom catalyst. Background technique [0002] Single-atom catalyst materials exhibit significantly superior performance to traditional catalysts due to their great atom utilization, uniform and controllable metal active sites, and their unique metal-support interactions. [0003] Since Academician Zhang Tao's team first reported single-atom catalysts in 2011, it has set off a research storm that has swept the world in the fields of electrocatalysis, organic synthesis, biological diagnosis and treatment, and biomass conversion. However, at present, single-atom catalysts can only realize the controllable preparation of single-atom catalysts with a maximum of two metal elements, and there have been no reports for multi-component catalysts with more than two elements, which is mainly due to the large differences between differen...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08
CPCB01J27/24B01J37/082B01J35/33
Inventor 田新龙饶鹏邓培林沈义俊
Owner HAINAN UNIVERSITY
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