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A kind of in-situ dissolution type catalyst and its preparation method and application

A catalyst and in-situ technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of large limitations of leaching metal elements and harsh leaching conditions , slow dissolution rate, etc., to achieve the effect of no change in catalyst morphology, improved catalytic activity, and improved stability

Active Publication Date: 2022-06-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problems in the prior art that the eluting element must have a radius close to that of the metal element at the doped site and be easy to be reduced, and provides a new type of eluting catalyst, which uses layered crystals as the framework Catalysts that elute metal nanoparticles have a wide selection range of eluting metal elements, low eluting temperature and fast speed, which solves the limitation of eluting metal elements in perovskite-type eluting catalysts in the prior art. The problem of harsh conditions and slow dissolution rate, and the catalyst has very beneficial stability and catalytic activity

Method used

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  • A kind of in-situ dissolution type catalyst and its preparation method and application
  • A kind of in-situ dissolution type catalyst and its preparation method and application
  • A kind of in-situ dissolution type catalyst and its preparation method and application

Examples

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Effect test

Embodiment 1

[0050] (1) Add 0.001 mol of Cu(NO) to 20 mL of deionized water successively 3 ) 2 ·3H 2 O, 0.002mol Ni(NO 3 ) 2 ·6H 2 O and 0.1 g of multi-walled carbon nanotubes (MWCNTs), stir well. The mixed solution was transferred to a sonicator to suspend for 30 min, and then stirred at a constant speed for 24 h at room temperature to form a uniform suspension;

[0051] (2) Transfer the suspension to the autoclave, react at 80°C for 12 hours, take out and continue stirring at 80°C to completely evaporate the solvent.

[0052] (3) the solid remaining in the step (2) is placed in a quartz boat and placed in a tube furnace for calcination, and the air flow rate is 60 mLmin -1 , heated to 200°C at a heating rate of 3°C / min, and kept for 1h.

[0053] (4) Wash the powder of the calcined material in step (3) alternately with deionized water and ethanol three times, transfer it to a vacuum drying oven, and dry it at 50°C overnight to obtain Cu-doped NiOOH@MWCNT (denoted as Cu 1 Ni 2 @MW...

Embodiment 2

[0056] According to the process of Example 1, the molar ratio of copper salt and nickel salt in step (1) was changed to 1:1.5 to obtain a copper-based catalyst with nickel-based hydroxide as a solid solution. The specific surface area of ​​the catalyst is 56.32m 2 / g.

Embodiment 3

[0058] According to the process of Example 1, the calcination temperature in step (3) was changed to be heated to 300° C. at the same heating rate, and kept for 1 h. The specific surface area of ​​the catalyst is 50.5m 2 / g.

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Abstract

The invention relates to the technical field of chemical catalysts and their preparation, and discloses an in-situ eluting catalyst and its preparation method and application. The catalyst uses layered crystals as the eluting framework, and the lattice gaps are doped with eluting metals and their oxides. , by electroreduction to in-situ elute the doped eluting metal and its oxide, the preparation method is to mix the eluting metal salt and layered crystal for hydrothermal synthesis, and induce the metal and metal oxide by calcination and electric reduction Dissolving in the lattice gap, the dissolved nanoparticles have small particle size and uniform size, showing good electrocatalytic reduction ability of carbon dioxide, and have excellent stability. The electrolysis lasts for 40 hours, and the electrocatalytic performance is not weakened. Nanoparticles There is no agglomeration phenomenon, which breaks the barrier that currently selected solid solutions are mostly perovskite materials, and the reduction conditions are mild and the dissolution rate is fast.

Description

technical field [0001] The invention relates to the technical field of chemical catalysts and preparation thereof, in particular to an in-situ dissolution type catalyst and a preparation method and application thereof. Background technique [0002] Metal nanoparticles have been shown to be effective catalysts, exhibiting excellent performance in a wide range of applications including photocatalysis, thermocatalysis, and electrocatalysis. However, nanoparticles often face deactivation problems such as agglomeration and fragmentation during the catalytic process. To enhance the stability of the system, a common strategy is to combine nanoparticles with stable porous supports. Typical loading methods mainly include physical mixing, vapor deposition and impregnation. Due to the weak interaction between the carrier and the nanoparticles, the size distribution of the loaded particles will be uneven and the composite materials will be easily separated, thereby affecting the cataly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J35/10C25B1/23C25B11/091C25B1/50
CPCB01J23/755C25B1/00B01J35/39B01J35/33B01J35/613Y02E60/50
Inventor 何奕王梦楚张彼克施耀
Owner ZHEJIANG UNIV