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Au@CeO2 nanocomposite material having hollow core-shell structure, and preparation method thereof

A technology of nanocomposite material and core-shell structure, which is applied in the field of hollow core-shell structure AuCeO2 nanocomposite material and its preparation, which can solve the problems such as the easy sintering of active component Au, and achieve the effect of facilitating adsorption and desorption and reducing diffusion resistance

Inactive Publication Date: 2015-04-01
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hollow core-shell structure AuCeO prepared by the preparation method of the present invention 2 Nanocomposites can not only solve the problem of easy sintering of the active component Au in the catalytic oxidation reaction of CO, but also reduce the diffusion resistance of reaction molecules and product molecules.

Method used

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  • Au@CeO2 nanocomposite material having hollow core-shell structure, and preparation method thereof
  • Au@CeO2 nanocomposite material having hollow core-shell structure, and preparation method thereof
  • Au@CeO2 nanocomposite material having hollow core-shell structure, and preparation method thereof

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preparation example Construction

[0021] The invention provides a hollow core shell structure AuCeO 2 A method for preparing a nanocomposite, wherein the method comprises the following steps,

[0022] 1) After the cerium source, urea and distilled water are mixed and dissolved to obtain a dissolved solution, the sodium citrate solution is first contacted with the dissolved solution, and the product after the first contact is first contacted with a hydrogen peroxide solution. The second contact is to crystallize the product after the second contact and dry to obtain a solid product;

[0023] 2) After uniformly mixing gold source, stabilizer and distilled water to obtain a mixed solution, adding the solid product obtained in step 1) to the mixed solution for the third contact, separating the solid-liquid product after the third contact to obtain The first solid, the obtained first solid is dispersed in distilled water to obtain a dispersion, the dispersion is contacted with sodium citrate for the fourth time, a...

Embodiment 1

[0050] 1) At 25°C, put 1.24g of cerous chloride, 1.5g of urea and 238mL of distilled water in a 500mL small beaker, stir magnetically to make the solution appear colorless and transparent, add dropwise 120mL of sodium citrate aqueous solution (concentration: 10mmol / L), after stirring for 10min, dropwise add 30% by weight of hydrogen peroxide aqueous solution (the addition of hydrogen peroxide is 15mmol), continue stirring for 30min, put into a 200mL crystallization kettle, crystallize at 180°C for 22h, crystallize After the completion of the crystallization, the crystallization kettle was quenched, and the crystallized product was suction-filtered with 500 mL of distilled water, and the product was dried at 100° C. for 12 hours to obtain 0.5 g of light yellow solid powder. Its X-ray powder diffraction pattern is as follows figure 1 As shown, (110), (200), (220), (311), (222), (400), (331), (420) and (422) belong to CeO 2 The characteristic diffraction peaks belong to the cub...

Embodiment 2

[0053] 1) At 25°C, put 1.24g of cerous chloride, 0.75g of urea and 135mL of distilled water in a 500mL small beaker, stir magnetically to make the solution appear colorless and transparent, add dropwise 120mL of sodium citrate aqueous solution (concentration: 10mmol / L), after stirring for 20min, dropwise add 30% by weight of hydrogen peroxide aqueous solution (the addition of hydrogen peroxide is 20mmol), continue stirring for 20min, put into a 200mL crystallization kettle, crystallize at 180°C for 22h, crystallize After the crystallization was completed, the crystallization kettle was quenched, and the crystallized product was suction-filtered with 500 mL of distilled water, and the product was dried at 100° C. for 12 hours to obtain 0.49 g of light yellow solid powder. Its transmission electron microscope pictures are as Figure 8 As shown, the hollow CeO 2 The size of the microspheres is between 540-770nm, and the shell thickness is about 100nm.

[0054]2) Mix chloroauri...

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Abstract

The invention relates to a preparation method of an Au@CeO2 nanocomposite material having a hollow core-shell structure, and a composite material prepared through the method. The method comprises the following steps: mixing a cerium source, urea and distilled water for dissolving the cerium source and urea, allowing the obtained mixture to have a first contact with a sodium citrate solution, allowing a product obtained after the first contact to have a second contact with a hydrogen peroxide solution, crystallizing a product obtained after the second contact, and drying the crystallized product to obtain a solid product; and uniformly mixing a gold source, a stabilizer and distilled water, allowing the obtained solution to have a third contact with the solid product, separating a first solid from a product obtained after the third contact, dispersing the first solid in distilled water to obtain a dispersion liquid, allowing the dispersion liquid to have a fourth contact with sodium citrate, adding a reducing agent into a product obtained after the fourth contact in order to carry out a fifth contact, and carrying out solid-liquid separation of a product obtained after the fifth contact. The Au@CeO2 nanocomposite material having a hollow core-shell structure prepared through adopting the method solves an easy sintering problem of an active component Au in a CO catalytic oxidation reaction process, and also reduces the dispersion resistances of reaction molecules and product molecules.

Description

technical field [0001] The invention relates to a hollow core-shell structure AuCeO 2 Nanocomposites and methods for their preparation. Background technique [0002] The catalytic oxidation of carbon monoxide (CO) has important practical significance in the fields of energy, chemical industry and environment. At present, for the catalytic oxidation of CO, the catalytic activity of supported gold nanoparticles is much greater than that of unsupported gold catalysts. while CeO 2 As a good active carrier, it has been paid more and more attention by researchers. At the same time, CeO 2 It has n-type semiconductor properties and has oxygen vacancies that can provide reactive oxygen. Due to the continuous occurrence of adsorption on oxygen vacancies, there may be a large amount of O at the gold-support interface. 2 2- or O 2- And other surface species, its better overflow makes the speed of diffusion to the gold crystal grains faster, greatly improving the reactivity of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/04
Inventor 齐健唐智勇
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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