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Monatomic metal catalyst as well as preparation method and application thereof

A metal catalyst and atomic technology, applied in the field of single-atom metal catalysts and their preparation, can solve the unsatisfactory problems of single-atom catalysts, and achieve the effects of stable output, high output, and simple synthesis method

Active Publication Date: 2021-05-25
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the current synthetic methods of single-atom catalysts, there are many unsatisfactory defects and deficiencies

Method used

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  • Monatomic metal catalyst as well as preparation method and application thereof
  • Monatomic metal catalyst as well as preparation method and application thereof
  • Monatomic metal catalyst as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1: Preparation of a catalyst with monoatomic cobalt dispersion

[0036] Preparation of catalysts Co@Si@SiO with monatomic cobalt dispersion on the surface x (x is an integer or decimal between 0 and 2), and its specific preparation process is as follows:

[0037] Step 1. Under nitrogen atmosphere, tetramethoxysilane (24mL), isopropanol (16mL), water (20mL), acetonitrile (20mL), nitric acid (48mmol) and cobalt nitrate solution (0.17mg / mL, 10mL) into a round-bottomed flask and mixed, stirred until the system was completely dissolved, heated at 120°C, and continued to stir. When the system gelled and completely solidified, stop stirring; after aging for 48 hours, use deionized water and After washing with ethanol for 3 times, dry in an oven at 105°C for 24 hours, take it out, and grind it to a fine blue powder to obtain a hydrolyzed gel with uniform dispersion of metal cobalt ions (Co@HSiO x );

[0038] Step 2. Put the completely dried Co@HSiOx Place in a tube f...

Embodiment 2

[0043] Example 2: Single-atom cobalt catalyst Co@Si@SiO x Photocatalytic reduction of carbon dioxide experiment

[0044] Set up experimental group 2: reduce the amount of cobalt nitrate solution in Example 1 by half, that is, use 5mL, and the other raw materials and their amounts are completely set according to Example 1, and then follow the same preparation method and steps in Example 1 A monoatomic cobalt catalyst is prepared.

[0045] Set up experimental group 3: increase the amount of cobalt nitrate solution in Example 1 by 10 times, that is, use 100mL, other raw materials and their amounts are completely set in accordance with Example 1, and then follow the same preparation method and steps in Example 1 A monoatomic cobalt catalyst is prepared.

[0046] Set up experimental group 4: increase the amount of cobalt nitrate solution in Example 1 by 5 times, that is, use 50mL, and the other raw materials and their amounts are completely set in accordance with Example 1, and t...

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Abstract

The invention discloses a monatomic metal catalyst as well as a preparation method and application thereof. According to the monatomic metal catalyst, alkoxy silane and a metal salt solution are mixed and subjected to a hydrolysis reaction, and then a solid-phase reduction reaction is performed to prepare the monatomic metal catalyst. According to the method, the concept of epitaxial growth is utilized for the first time, the process of co-crystallization growth, thermal cracking and crystal regrowth of target metal atoms and a substrate material is achieved through fine solid chemical synthesis regulation and control, and metal single atoms are reduced on a crystal interface and stably exist in pore channels of the material. The catalytic reaction does not only occur on the surface of the catalyst, the pore structure facilitates the contact between the catalyst interface and the reactant, the effective reaction place is provided, the synthesis method of the monatomic catalyst is simple, the yield is high, the monatomic catalyst is stable, addition of additional reagents and auxiliary materials is not required, and the application potential in the monatomic catalysis field is huge.

Description

technical field [0001] The invention relates to the field of single-atom catalysts, in particular to a single-atom metal catalyst and its preparation method and application. Background technique [0002] Because of their better catalytic activity or selectivity, and extremely high utilization of metal atoms, single-atom catalysts have aroused extensive influence and research interest in the field of catalysis in recent years. Compared with high-loaded metal catalysts with only a few metal active components having a catalytic effect, each metal atom of a single-atom catalyst can exert catalytic activity, and its efficiency can often be equivalent to ten or even hundreds of thousands of effects, especially For noble metal catalysts, the use of high loads greatly increases the cost of the catalyst, and also causes waste of resources and pollution to the environment. Therefore, in order to maximize the catalytic efficiency of the catalyst and reduce its use cost, single-atom met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J35/00B01J35/10B01J37/03B01J37/18
CPCB01J23/75B01J37/036B01J37/18B01J35/391B01J35/60B01J35/39
Inventor 杨振宇陈槐熊杨杨苏成勇
Owner SUN YAT SEN UNIV
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