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Preparation method of spontaneous dispersing single atom Ag1/Co3O4 catalyst

A spontaneous dispersion and catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, separation methods, etc., can solve problems affecting catalyst performance, precious metals are difficult to disperse, precious metals are easy to agglomerate, etc., to achieve excellent catalytic performance and stability Well, overcome the effect of reunion

Active Publication Date: 2019-06-21
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain problems in these methods, such as the single-atom catalyst prepared by surface atom replacement has no lattice oxygen, the noble metal is difficult to disperse in the atomic layer deposition method, the content of the noble metal obtained by the complexing agent leaching method is low, and the solution chemical method Precious metals are easy to reunite
Moreover, during use, as the temperature rises, the noble metal on the surface of the supported single-atom noble metal catalyst will agglomerate, which affects the performance of the catalyst.

Method used

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  • Preparation method of spontaneous dispersing single atom Ag1/Co3O4 catalyst
  • Preparation method of spontaneous dispersing single atom Ag1/Co3O4 catalyst
  • Preparation method of spontaneous dispersing single atom Ag1/Co3O4 catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Take 12g Co(AC) 2 4H 2 O was dissolved in 600mL of ethylene glycol, and the mixture was transferred to a 1L three-necked flask, connected to a condenser for condensation and reflux, heated and stirred at 180°C for 6h, and reacted to obtain cobalt glycolate.

[0029] (2) Centrifuge the solid obtained in step (1), wash with ethanol 3-5 times to remove ethylene glycol, and dry at 80° C. for 12 hours.

[0030] (3) Dissolve 0.44g of silver nitrate in 10mL of deionized water, add ammonia water dropwise until precipitation occurs, continue to add ammonia water dropwise until the solution is clear, and then continue to drop 2mL of excess ammonia water.

[0031] (4) Take 2 g of the solid obtained in step (2), ultrasonically disperse it in 20 mL of deionized water, and slowly add H 2 o 2 solution, prepared Co with exposed {110} and {100} facets 3 o 4 carrier.

[0032] (5) Add step (3) solution and H to the solution in step (4) dropwise 2 o 2 solution, the rate of addi...

Embodiment 2

[0036] The difference between this example and Example 1 is that the catalyst obtained in step (6) in Example 1 was heat-treated in an air atmosphere at 150° C. for 30 minutes. In order to verify the success of the prepared catalyst and the Ag state on the surface of the Ag catalyst, X-ray powder diffraction analysis was carried out on the catalyst, the results are as follows figure 1 .

Embodiment 3

[0038]The difference between this example and Example 1 is that the catalyst obtained in step (6) in Example 1 was heat-treated in an air atmosphere at 200° C. for 30 minutes. In order to verify the success of the prepared catalyst and the Ag state on the surface of the Ag catalyst, X-ray powder diffraction analysis was carried out on the catalyst, the results are as follows figure 1 .

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PUM

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Abstract

The invention discloses a preparation method of a spontaneous dispersing single atom Ag1 / Co3O4 catalyst. Ag atoms are captured and anchored by use of cation defect sites on the Co3O4 surface, the stability of single atom Ag can be enhanced, the defect of agglomeration at the high temperature is overcome, the prepared spontaneous dispersing single atom Ag1 / Co3O4 catalyst can catalyze CO at the temperature of 100 DEG C, and the conversion rate reaches 100%. The spontaneous dispersing single atom Ag1 / Co3O4 material can be obtained without high-temperature treatment, and Ag can be spontaneously dispersed in the heating process and can be dispersed in situ in the reaction atmosphere. Complicated reaction and operation steps are not involved in the preparation process, and the preparation methodis easy to operate and repeat.

Description

technical field [0001] The invention belongs to the technical field of preparation of catalyst materials, in particular to a spontaneously dispersed single-atom Ag 1 / Co 3 o 4 Catalyst preparation method. Background technique [0002] In general, supported noble metal catalysts have better catalytic performance than other metal catalysts or metal oxide catalysts. However, its high cost limits its practical application. Highly dispersed single-atom-supported noble metal catalysts have been widely studied due to their high noble metal utilization efficiency, which can reduce the cost of catalysts. This highly dispersed single-atom catalyst generally has better catalytic performance than traditional noble metal catalysts, and can be applied to the catalytic oxidation of carbon monoxide (CO) and the removal of nitrogen oxides (NO x ) and indoor volatile organic compounds (VOCs) and other fields. However, the preparation process of such catalysts is usually relatively compl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/12B01J37/16B01D53/86B01D53/62
Inventor 黄志伟荆国华张杰吴孝敏
Owner HUAQIAO UNIVERSITY
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