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Supported core-shell catalyst with oxide coated shell and metal nanoparticle core and preparation method thereof

An oxide and supported technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as complex preparation process, organic pollution, and difficult control , to achieve the effect of simple and easy-to-adjust operation method, uniform and controllable shell thickness, and easy-to-control reaction

Inactive Publication Date: 2014-12-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only makes the preparation process complicated and difficult to control, but also brings about the pollution and removal of organic matter, and also involves the formation of the shell oxide precursor in the entire solution phase, that is, the reaction to form the oxide precursor does not only occur in the On the surface / interface of the metal core, and occurs in the solution phase and agglomerates, causing separation difficulties
[0005] The present invention aims to solve the key problem of controlling the reaction of forming a shell or its precursor to be localized on the surface / interface of nano metal particles in the preparation of existing core-shell structure nanomaterials, and provides a supported metal oxide nano-core-shell structure Catalyst and its preparation method

Method used

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  • Supported core-shell catalyst with oxide coated shell and metal nanoparticle core and preparation method thereof
  • Supported core-shell catalyst with oxide coated shell and metal nanoparticle core and preparation method thereof
  • Supported core-shell catalyst with oxide coated shell and metal nanoparticle core and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] One: 1): Add 0.5ml24.28×10 to the round bottom flask equipped with reflux cold flow tube -3 mol / l of chloroauric acid. After vigorously stirring and heating to reflux, when the solution boils, quickly add 2.4ml sodium citrate (mass percentage 1%), stir for 30 min under boiling conditions, remove the heat source and cool to room temperature naturally to obtain 17nm Au nanoparticles for use. The TEM picture Such as figure 1 Shown. 2): Weigh 0.1736g of cerium nitrate and dissolve in 50ml of water, then add 0.126g of citric acid, 0.15g of ethylene glycol, and add 1.5% ammonia water dropwise to adjust the pH of the solution to 6.7.3): Take 50ml step 1) The resulting sol and 100ml. Step 2) The obtained solution is mixed and added to the lighting equipment, the wavelength of the light source is 200~800nm, and the intensity of the light source is 200mW / cm 2 , Control the reaction temperature to 25℃, illuminate for 15min, 45min, 2h to obtain AuCe 3+ Gel, its TEM picture such as ...

Embodiment 2

[0047] 1) Dissolve 4.7ml sodium citrate (mass fraction 1%) in 45ml water, stir vigorously for 15min, then pour it into a 100ml round bottom flask equipped with reflux cold flow tube, when it starts to boil, add 0.5ml Chloroauric acid (24.28×10 -3 mol / l), react for 30 minutes, and cool to room temperature to obtain 11nm Au nanoparticles for later use. 2): Weigh 0.1736g of cerium nitrate dissolved in 50ml of water, then add 0.126g of citric acid, 0.15g of ethylene glycol, and add 1.5% ammonia water to adjust the pH of the solution to 6.7.3): Take 50ml of the product obtained in step 1) Mix with 100ml of the product obtained in step 2) and add it to the lighting equipment. The wavelength of the light source is 200-800nm, and the light source intensity is 200mW / cm 2 , Control the temperature of the reaction solution to 25℃, and set the illumination time to 2h. 4): Centrifuge the final product at 10000r / min for 15min, take out the gel, dissolve it in 2ml of water, and immerse it in ...

Embodiment 3

[0049] First, add 0.5ml 24.28×10 to the round bottom flask equipped with reflux cold flow tube -3 mol / l of chloroauric acid. Then, after vigorous stirring and heating to reflux, when the solution boils, quickly add 1.4ml sodium citrate (mass fraction 2%), stir for 30 minutes under boiling conditions, remove the heat source and cool to room temperature naturally to obtain 22nm Au nanoparticles for later use.

[0050] The subsequent steps are exactly the same as in Example 1.

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Abstract

The invention discloses a supported core-shell catalyst with an oxide coated shell and a metal nanoparticle core and a preparation method of the catalyst. The preparation method comprises the following steps: by taking SiO2, graphite, carbon nano tubes (CNTs), Al2O3 and TiO2 as carriers, triggering heat on an interface between metal nanoparticles and a liquid-phase medium by illuminating by virtue of surface plasma resonance effects of the metal nanoparticles so as to trigger a shell forming thermal reaction of a metal oxide precursor to be localized on the interface, sequentially centrifuging, dipping, drying and calcining to obtain a supported metal @ oxide core-shell catalyst. The invention provides the novel preparation method of a core-shell structure; the method has the advantages that the preparation process is simple, the cost is low, the pollution is avoided and the shell forming reaction is only localized on the interface; and the supported core-shell catalyst has the characteristics that the dispersion performance is high, the particle diameter and shell thickness of the metal nanoparticles are uniform and controllable.

Description

Technical field [0001] The invention relates to a supported oxide-coated metal (metal oxide) core-shell catalyst and a method for forming a metal core surface oxide shell initiated by local surface plasmon resonance photothermal, in particular, it can be used to prepare a metal oxide by a thermally initiated reaction Core-shell nanoparticles. Background technique [0002] In recent years, the use of core-shell nanomaterials for catalytic reactions has received great attention. This is because the core-shell components are prone to synergistic effects. The metal oxide wraps the metal nanoparticles, which not only facilitates the interaction between the metal and the oxide, but also the confinement effect of the oxide shell can prevent the metal nanoparticles from sintering. Dots are very valuable for nano-metal catalysts. By adjusting the core and shell components and ratios, as well as the particle size and shell thickness, the performance can be adjusted for different catalyti...

Claims

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Application Information

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IPC IPC(8): B01J35/08B01J23/66
Inventor 张立红屈缨虹魏莹钟慧娴刘源
Owner TIANJIN UNIV
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