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High-load metal monatomic catalyst as well as preparation method and application thereof

A catalyst and metal technology, applied in the field of high-loaded metal single-atom catalysts and their preparation, to achieve the effect of high specific surface area

Pending Publication Date: 2021-12-31
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is very challenging to prepare single-atom catalysts under realistic synthesis and reaction conditions and maintain the dispersion of metal atoms, especially the single-atom active sites at high metal loadings.

Method used

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  • High-load metal monatomic catalyst as well as preparation method and application thereof
  • High-load metal monatomic catalyst as well as preparation method and application thereof
  • High-load metal monatomic catalyst as well as preparation method and application thereof

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Embodiment 1

[0039] figure 1 It is a schematic diagram of the technical route of the present invention. Firstly, the nitrogen-rich porous polymer (SNW-1) was prepared by Schiff base reaction between melamine and terephthalaldehyde; then, SNW-1 was thoroughly mixed and reacted with cobalt acetate universal ultrasound to utilize the SNW-1 Abundant nitrogen atoms anchor metals; finally, high-cobalt-loaded metal single-atom catalysts (SACo-NCs) are obtained by high-temperature carbonization in an inert atmosphere. The specific steps are as follows:

[0040] 1. Preparation:

[0041] (1) Put melamine (313mg, 2.485mmol), terephthalaldehyde (500mg, 3.728mmol) and dimethyl sulfoxide (15.5mL) into a three-necked flask, heat to reflux and stir under an inert atmosphere. The heating temperature is 180°C for 72h. After the reaction, the reaction system was cooled to room temperature, filtered to obtain a solid powder, and then the solid product was washed with excess acetone, tetrahydrofuran and di...

Embodiment 2

[0048] Nitrogen-rich porous polymer (SNW-1) was prepared by the Schiff base reaction of melamine and terephthalaldehyde; then, SNW-1 was thoroughly mixed and reacted with palladium acetate universal ultrasound to utilize the abundant Nitrogen atoms anchor the metal; finally, a high-palladium-loaded metal single-atom catalyst (SAPd-NC) was obtained by high-temperature carbonization in an inert atmosphere. The specific steps are as follows:

[0049] 1. Preparation:

[0050] (1) Put melamine (313mg, 2.485mmol), terephthalaldehyde (500mg, 3.728mmol) and dimethyl sulfoxide (15.5mL) into a three-necked flask, heat to reflux and stir under an inert atmosphere. The heating temperature is 180°C for 72h. After the reaction, the reaction system was cooled to room temperature, filtered to obtain a solid powder, and then the solid product was washed with excess acetone, tetrahydrofuran and dichloromethane, and finally the solvent was removed in vacuo at room temperature to obtain SNW-1 m...

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Abstract

The invention belongs to the technical field of functional material preparation, and discloses a high-load metal monatomic catalyst as well as a preparation method and application thereof. The method comprises the following steps of: heating, refluxing and stirring melamine, terephthalaldehyde and dimethyl sulfoxide at 175-180 DEG C in an inert atmosphere; cooling a reaction system to room temperature after the reaction is finished; filtering and washing a product; drying the product in vacuum to remove a solvent; adding an obtained nitrogen-rich porous polymer and metal acetate into ethanol, and carrying out ultrasonic treatment; drying a dispersion at 50-90 DEG C under a vacuum condition to obtain powder; carbonizing prepared SNW-1@M powder in an inert atmosphere at 600-900 DEG C; washing a product with deionized water; and drying the product in vacuum to obtain the high-loading metal monatomic catalyst. The loading capacity of metal in the metal monatomic catalyst is 5-8 wt%. The metal monatomic catalyst prepared by the invention has high specific surface area and high conductivity, and can be used in the fields of adsorption, energy storage and catalysis.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and more specifically relates to a high-capacity metal single-atom catalyst and its preparation method and application. Background technique [0002] Due to their special properties, including surface and interface effects, quantum effects, and macroscopic quantum tunneling effects, nanomaterials have attracted extensive attention from researchers in the past two decades. In the field of catalysis, the catalytic activity of nanomaterials largely comes from the large number of unsaturated coordination atoms on their surface. Therefore, researchers control the distribution and structure of catalyst surface atoms by adjusting the size, morphology, and crystal plane of nanoparticles to improve their catalytic performance. With the development of nanocatalysis and the advancement of characterization technology, researchers have found that when the size of nanoparticles is ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10B22F9/24B22F1/00B01J20/02B01J20/20B01J20/28B01J20/30
CPCB01J27/24B22F9/24B01J20/20B01J20/28061B01J20/28064B01J20/28071B01J20/02B01J35/617B01J35/633B01J35/615
Inventor 陈超张振宇林展林铮徐娟
Owner GUANGDONG UNIV OF TECH