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Method for preparing metal monatomic catalyst by hydrothermal method

A hydrothermal method and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve problems such as harsh reaction conditions and achieve rich active sites , avoid agglomeration, the effect of simple preparation process

Pending Publication Date: 2022-04-15
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The metal atom capture method usually uses individual metals (such as Cu, Zn) to volatilize or escape at higher temperatures or in a specific atmosphere, so that they are captured by a defect-rich matrix, but most metals are easier to agglomerate at higher temperatures, so This method requires harsh reaction conditions
[0003] All in all, it is very challenging to design a simple, efficient and general-purpose method to prepare single-atom

Method used

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  • Method for preparing metal monatomic catalyst by hydrothermal method
  • Method for preparing metal monatomic catalyst by hydrothermal method
  • Method for preparing metal monatomic catalyst by hydrothermal method

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Experimental program
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Effect test

Embodiment 1

[0036] Add 100 mg of nitrogen-doped carbon nanospheres to 50 mL of ultrapure water, stir to disperse to obtain a mixed solution A; add 90 mg of cobalt nitrate hexahydrate, and continue stirring for 30 minutes to obtain a mixed solution B, and 10 mL of 50 mg / mL thiourea The solution was added dropwise to the mixed solution B, and the dripping time was 3 minutes to obtain the mixed solution C; the mixed solution C was transferred to the polytetrafluoroethylene memory, packaged and transferred to the blast drying oven, and the reaction temperature was set at 180°C, and the reaction Time 8h; After the reaction is completed, cool to room temperature and collect the solid material; wash the solid material with ultrapure water, centrifuge 3-4 times, collect the solid material, put it in a blast drying oven at 80°C for 12 hours, and then obtain the carbon-supported metal single-atom catalysts.

[0037] figure 1 a and 1b are spherical aberration-corrected high-angle annular dark-field...

Embodiment 2

[0042] Add 50mg of carbon nanospheres to 50mL of ultrapure water, stir to disperse to obtain mixed solution A; add 90mg of cobalt nitrate hexahydrate, continue stirring for 30min to obtain mixed solution B, add 10mL of 50mg / mL thiourea solution dropwise Into the mixed solution B, add dropwise for 3 minutes to obtain the mixed solution C; transfer the mixed solution C to a polytetrafluoroethylene memory, package it and transfer it to a blast drying oven, set the reaction temperature to 180°C, and the reaction time to 8 hours; After the reaction, cool to room temperature and collect the solid material; wash the solid material with ultrapure water, centrifuge 3-4 times, collect the solid material, put it in an 80°C blast drying oven for 12 hours, and obtain a carbon-supported metal single-atom catalyst .

Embodiment 3

[0044] Add 150mg of graphene to 50mL of ultrapure water, stir to disperse to obtain mixed solution A; add 90mg of cobalt nitrate hexahydrate, continue stirring for 30min to obtain mixed solution B, add 10mL of 50mg / mL thiourea solution dropwise to In the mixed solution B, drop the time for 3 minutes to obtain the mixed solution C; transfer the mixed solution C to the memory of polytetrafluoroethylene, package it and transfer it to the blast drying box, set the reaction temperature to 180°C, and the reaction time to 8 hours; After cooling to room temperature, collect the solid material; wash the solid material with ultrapure water, centrifuge 3-4 times, collect the solid material, and put it in a blast drying oven at 80°C for 12 hours to obtain a carbon-supported metal single-atom catalyst.

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Abstract

The invention relates to a method for preparing a metal monatomic catalyst by a hydrothermal method, which comprises the following steps: (1) dispersing a carbon-based carrier into ultrapure water, and sequentially adding a metal salt and a thiourea solution to obtain a precursor solution; and (2) transferring the precursor solution into a reaction kettle, carrying out hydrothermal reaction, collecting an obtained solid product, washing and drying to obtain a target product. Compared with the prior art, the simple hydrothermal method is adopted to prepare the metal monatomic catalyst, the problems of high energy consumption, easy agglomeration and the like caused by high temperature are avoided, and low-cost and large-scale preparation of the metal monatomic catalyst can be realized.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and relates to a method for preparing a metal single-atom catalyst by a hydrothermal method. Background technique [0002] Single-atom catalysts are a new type of catalysts that have emerged in recent years and have been widely used in photocatalysis, electrocatalysis, thermal catalysis and other fields. Single-atom catalysts are a class of supported catalysts that contain only isolated single atoms as catalytically active centers. Single atoms have the advantages of high activity, good selectivity, and high atom utilization, and are currently one of the research hotspots in the field of catalysis. From a thermodynamic analysis, single atoms are prone to atomic agglomeration and catalyst instability due to their high surface energy. Currently, common methods for the synthesis of single-atom catalysts include direct pyrolysis, coordination anchoring, spatial confinement, modular synt...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J27/24B01J37/10
Inventor 刘肖燕杨梦华田悦吴金凤李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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