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Silver nanoparticle filled microporous carbon spheres, preparation method thereof and use thereof as catalyst

A technology of silver nanoparticles and microporous carbon, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of no preparation method and achieve uniform distribution , The effect of high product purity and easy separation

Inactive Publication Date: 2011-01-05
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no effective preparation method, especially without any template and additives, to realize the uniform filling of the obtained spherical matrix with metal nanoparticles, which not only ensures the high number density and dispersion uniformity of the particles, but also realizes Its size, position and number density are controllable

Method used

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  • Silver nanoparticle filled microporous carbon spheres, preparation method thereof and use thereof as catalyst
  • Silver nanoparticle filled microporous carbon spheres, preparation method thereof and use thereof as catalyst
  • Silver nanoparticle filled microporous carbon spheres, preparation method thereof and use thereof as catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Transfer 44 mL of 0.3 M sucrose aqueous solution into a 88 mL hydrothermal reaction vessel (50% full) and seal it. Then put the reaction kettle into an oven, the oven temperature is 190°C, and the reaction time is 2.25h. After the reaction was complete, it was taken out and cooled in air. Finally, the microporous carbon spheres were prepared by centrifugally cleaning with distilled water and alcohol, and drying in an oven.

[0050] figure 1 a is a transmission electron microscope (TEM) picture of the microporous carbon spheres obtained in Example 1. It can be seen that the microporous carbon spheres are relatively uniform in size, with an average diameter of about 800nm; figure 1 b is a high-resolution image of the edge of the microporous carbon sphere. Numerous nanopores are distributed on the surface of the microporous carbon sphere. It can be inferred that the carbon sphere has a microporous structure, which provides a prerequisite for ions to enter the interior...

Embodiment 2

[0052] Using the microporous carbon spheres obtained in Example 1 as a raw material, Ag-C composite spheres were prepared according to the above-mentioned method for preparing microporous carbon spheres filled with silver nanoparticles, and the reaction parameters were c=2mM, t I = 2h, P = 140W and t R = 10 min.

[0053] figure 2 It is the TEM pictures of different magnifications of Ag-C composite balls obtained in Example 2. From low magnification ( figure 2 a) It can be seen that a large number of small black spots are distributed inside the ball, but there are no balls on the surface. The black dots are nanoparticles with high number density but still uniform distribution. Since TEM is a two-dimensional projection image of a three-dimensional object, the center of the ball is very dark, and it seems that there are agglomerates of nanoparticles, which is due to the overlapping of two-dimensional imaging. The selected area electron diffraction (SAED) pattern of a singl...

Embodiment 3

[0057] Using the microporous carbon spheres obtained in Example 1 as a raw material, Ag-C composite spheres were prepared according to the above-mentioned preparation method of silver nanoparticles filled microporous carbon spheres, and the reaction parameters were c=0.5mM, t I = 4h, P = 140W and t R = 10 min.

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Abstract

The invention relates to a method for preparing silver nanoparticle filled microporous carbon spheres, which can realize uniform nanoparticle filling of the microporous carbon spheres. The invention also provides the silver nanoparticle filled microporous carbon spheres and use thereof as a catalyst. The preparation method comprises the following steps of: adding 0.2 to 0.3g of microporous carbonspheres into 20 to 100ml of 0.2 to 2.5mM ammonical silver solution for soaking; adding a reducing agent into the soaked microporous carbon sphere suspension; and heating by using microwaves for 2 to 10 minutes to reduce ammonical silver ions to obtain the silver nanoparticle filled microporous carbon spheres. The silver nanoparticle filled microporous carbon spheres can be used as a catalyst. The obtained silver nanoparticle filled microporous carbon spheres have the submicron-scale diameter and the pore diameter of less than 2nm; and the filled silver in a form of monodispersed spherical nanoparticles is uniformly dispersed in the microporous carbon spheres, has the controllable diameter in a range of 2 to 50nm, and accounts for 10 to 56 weight percent of silver nanoparticle filled microporous carbon spheres.

Description

technical field [0001] The invention relates to microporous carbon spheres filled with silver nanoparticles, its preparation method and its application as a catalyst. Background technique [0002] The surface plasmon resonance, surface-enhanced Raman scattering, and catalytic properties of metal nanoparticles strongly depend on their size, morphology, and interparticle coupling effects. In order to achieve performance regulation and optimization, scientists at home and abroad continue to explore the preparation and assembly of metal nanoparticles and the design of new structural composite materials. So far, many simple and effective preparation methods have been reported. However, due to their small size and high specific surface area, nanoparticles are prone to agglomeration and are difficult to collect from reaction solutions, and their self-assembly in solution is also a major problem in the field of nanotechnology. [0003] These factors above degrade the performance o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02B01J23/50B01J35/08C07C215/76C07C213/02
Inventor 唐少春孟祥康郑洲
Owner NANJING UNIV
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