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Preparation method of metal atomic-scale dispersion catalyst

A technology of metal atoms and catalysts, which is applied in the field of preparation of metal atom-level dispersed catalysts, can solve the problems of increasing energy consumption and achieve the effect of improving catalytic efficiency

Active Publication Date: 2021-07-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the traditional impregnation method involves high temperature treatment, it greatly increases the energy consumption in industrial production

Method used

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  • Preparation method of metal atomic-scale dispersion catalyst
  • Preparation method of metal atomic-scale dispersion catalyst
  • Preparation method of metal atomic-scale dispersion catalyst

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preparation example Construction

[0045] As an aspect of the present invention, a method for preparing a metal atomically dispersed catalyst of the present invention comprises the following steps:

[0046] 1) Under ambient conditions, mix activated carbon and 2,2-dithiophene and grind thoroughly; then place the ground powder in N 2 Keep at 750-850°C for 1-3 hours under the atmosphere to obtain a sulfur-doped carbon material (hereinafter referred to as: CS), which is ready for use;

[0047]2) In a centrifuge tube, ultrasonically homogenize the sulfur-doped carbon material in deionized water to obtain solution A, then dissolve the metal precursor in deionized water solution B; then drop solution B into the centrifuge containing solution A Mix in the tube, stir the mixture for 4-8h, then centrifuge, and wash the centrifuged solid with deionized water;

[0048] 3) vacuum-drying the centrifuged solid to obtain an atomically dispersed metal catalyst;

[0049] 4) Washing the atomically dispersed metal catalyst with...

Embodiment 1

[0060] A universal preparation method for an atomically dispersed catalyst, comprising the steps of:

[0061] 1) Under ambient conditions, first 0.5g of activated carbon and 0.9-1.1g of 2,2-dithiophene are fully ground, then, the ground powder is placed in N 2 Under the atmosphere at 800°C for 2 hours, the sulfur-doped carbon material (defined as CS) was finally successfully synthesized and is ready for use;

[0062] 2) In a centrifuge tube, 30mg CS was dissolved in 30mL deionized water by ultrasonic, then, 0.05mmol ruthenium trichloride was dissolved in 5mL deionized water, after that, the ruthenium trichloride solution was dropped into the In a centrifuge tube, next, the mixture was thoroughly mixed for 6 h, then centrifuged at 6000 rpm for 7 min, and washed three times with deionized water;

[0063] 3) Finally, the atomically dispersed Ru catalyst can be obtained after the sample is vacuum-dried at room temperature after centrifugation;

[0064] 4) Wash the atomically dis...

Embodiment 2

[0073] Repeat Example 1, its difference is only: in step 2), replace ruthenium trichloride with rhodium trichloride.

[0074] After testing, the Rh atomic-level catalyst was obtained.

[0075] Figure 8 STEM and elemental mapping of the atomically dispersed Rh catalyst prepared in step 3) of this example.

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Abstract

The invention discloses a preparation method of a metal atomic-scale dispersion catalyst, which comprises the following steps: under an environmental condition, mixing and fully grinding active carbon and 2,2-dithiophene; then placing and maintaining the ground powder in an N2 atmosphere for 1-3h to obtain a sulfur-doped carbon material for later use; in a centrifugal tube, carrying out ultrasonic homogenization on a sulfur-doped carbon material in deionized water to obtain a solution A, and dissolving a metal precursor in the deionized water to obtain a solution B; then dropwise adding the solution B into a centrifugal tube filled with the solution A, conducting mixing, stirring and mixing the mixture, then performing centrifugal separation, and cleaning and centrifugally separating solids; performing vacuum drying on the centrifugally separated solid to obtain an atom-dispersed metal catalyst; and conducting washing with hydrochloric acid to obtain the metal monatomic catalyst. The main components of the obtained metal atomic-scale dispersion catalyst comprise sub-nano clusters and single atoms; and the nanocluster in the catalyst has no lattice fringes, has an amorphous characteristic, and has a thickness of about one atomic layer.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, in particular to a method for preparing a metal atom-level dispersed catalyst. Background technique [0002] Fine chemicals are crucial high value-added products in chemical production, involving all aspects of production and life. Among them, aldehyde chemicals are important chemical raw materials for pesticides, medicines, spices and other products. For example, from the application point of view, the condensation reaction involves the application of aldehyde chemicals, such as the preparation of plasticizers and polyols, and the reduction reaction to prepare alcohols. Therefore, it is very important to improve the preparation and conversion of aldehydes. The carbonylation reaction, also known as hydroformylation or oxo synthesis, is an important reaction for the preparation of aldehydes from olefins. It is an important method to prepare carbonyl compounds such as aldehydes and ketones by ...

Claims

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Application Information

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IPC IPC(8): B01J27/22
CPCB01J27/22Y02E60/50
Inventor 程道建曹东
Owner BEIJING UNIV OF CHEM TECH
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