Double-layer hollow amorphous alloy nanometer ball as well as preparation method and application thereof

An amorphous alloy, double-layer hollow technology, applied in the preparation of nanospheres, the field of double-layer hollow amorphous alloy nanospheres, can solve the problems of alloy particle agglomeration, insufficient specific surface area, overheating, etc., and achieve simple preparation process , easy operation and long catalytic life

Inactive Publication Date: 2011-09-14
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In Journal of Catalysis 150, 434-438, 1994, it was reported that 2.5M KBH 4 The aqueous solution is added dropwise to 0.1M nickel acetate ethanol solution under stirring at 298K, and the precipitate is washed successively with 6 milliliters of 8M ammonia water and a large amount of distilled water to obtain a Ni-B amorphous alloy ultrafine particle catalyst. This method has become a preparation method. Conventional method for M-B amorphous alloy catalysts; however, this method has 4 The reduction reaction of the method is rapid and exothermic, which will cause local overheating and easily lead to the agglomeration of the generated alloy particles. Therefore, the biggest defect of this method is that the specific surface area is still not large enough.

Method used

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  • Double-layer hollow amorphous alloy nanometer ball as well as preparation method and application thereof
  • Double-layer hollow amorphous alloy nanometer ball as well as preparation method and application thereof
  • Double-layer hollow amorphous alloy nanometer ball as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Add 5ml of 0.01g / ml NiCl 2 ·6H 2 O solution was added to 0.3 g of sulfonated polystyrene hollow spheres, ultrasonicated for 20 min, stirred at 25 °C for 24 h, centrifuged, and freeze-dried to obtain NiCl 2 wrapped polystyrene pellets;

[0024] 2) Add 0.1mol / L KBH at 20°C 4 The aqueous solution is added dropwise to the NiCl prepared in step 1) 2 Encased in polystyrene pellets, of which: KBH 4 with NiCl 2 The molar ratio is 5:1;

[0025] 3) Filter the black particles generated in step 2), freeze-dry, then dissolve the polystyrene pellets with DMF or THF, and wash with deionized water and absolute ethanol for 3 to 5 times respectively to obtain a double-layer hollow Ni-B Amorphous alloy nanospheres, represented by Ni-B-bilayers.

[0026] figure 1 For the XRD spectrum of the sample prepared in this embodiment, it can be determined that the prepared sample is an amorphous structure from its diffuse peak shape at about 45° position; figure 2 It is the TEM photo o...

Embodiment 2

[0029] 1) Add 3ml of 0.05g / ml NiCl 2 ·6H 2 The O solution was added to 0.3 g of sulfonated polystyrene hollow spheres, ultrasonicated for 40 min, stirred at 0 °C for 24 h, centrifuged, and freeze-dried to obtain NiCl 2 wrapped polystyrene pellets;

[0030] 2) Add 1.0mol / L KBH at 0°C 4 The aqueous solution is added dropwise to the NiCl prepared in step 1) 2 Encased in polystyrene pellets, of which: KBH 4 with NiCl 2 The molar ratio is 5:1;

[0031] 3) Filter the black particles generated in step 2), freeze-dry, dissolve polystyrene pellets with DMF or THF, and wash with deionized water and absolute ethanol for 3 to 5 times respectively to obtain the target object.

[0032] The XRD spectrogram of the sample prepared by the present embodiment can determine that the obtained sample is an amorphous alloy structure; in the TEM photo of the sample prepared by the present embodiment, it can be seen that the obtained sample is a double-layer hollow structure nanosphere, and the i...

Embodiment 3

[0035] 1) Add 5ml of 0.05g / ml NiCl 2 ·6H 2 O solution was added to 0.5 g of sulfonated polystyrene hollow spheres, ultrasonicated for 60 min, stirred at 30 °C for 24 h, centrifuged, and freeze-dried to obtain NiCl 2 wrapped polystyrene pellets;

[0036] 2) Add 1.0mol / L KBH at 30°C 4 The aqueous solution is added dropwise to the NiCl prepared in step 1) 2 Encased in polystyrene pellets, of which: KBH 4 with NiCl 2 The molar ratio is 5:1;

[0037] 3) Filter the black particles generated in step 2), freeze-dry, dissolve polystyrene pellets with DMF or THF, and wash with deionized water and absolute ethanol for 3 to 5 times respectively to obtain the target object.

[0038]The XRD spectrogram of the sample prepared by the present embodiment can determine that the obtained sample is an amorphous alloy structure; in the TEM photo of the sample prepared by the present embodiment, it can be seen that the obtained sample is a double-layer hollow structure nanosphere, and the inne...

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Abstract

The invention discloses a double-layer hollow amorphous alloy nanometer ball which is characterized in that the activity ratio surface area is 20-40 square meters per gram; the diameter of an inner cavity is 240-260 nanometers; the distance between two layers is 40-60 nanometers; the thickness of a ball shell is 10-20 nanometers; the ball shell of the double-layer hollow nanometer ball is made from M-B amorphous alloy nanometer particles with the particle size of 4-6 nanometers; M is a metallic element; and the active specific surface area of the ball is 2-3 times of the active specific surface area of a solid amorphous alloy catalyst. The double-layer hollow amorphous alloy nanometer ball has long catalysis life, can be repeatedly used, has the almost constant catalysis efficiency, can be used as hydrogenation catalyst for the compounds containing unsaturated functional groups such as olefin, alkyne, phenols, nitryl and carbonyl compounds, and also can be used as the catalyst for coupling reaction, such as C-C, C-S, and the like. The double-layer hollow amorphous alloy nanometer ball is prepared by a hard mould plate reverse copying method in combination with a chemical reduction method. The preparation method is simple, the condition is easily controlled and the cost is low.

Description

technical field [0001] The invention relates to a double-layer hollow amorphous alloy nanosphere, a preparation method and application of the nanosphere, and belongs to the technical field of catalysts. Background technique [0002] Amorphous alloys are a new class of long-range disordered and short-range ordered materials. Their unique structural characteristics endow them with high corrosion resistance, high mechanical toughness, and excellent magnetic, electrical, and catalytic properties, and they are also environmentally friendly. . As a catalyst application, amorphous alloys are required to have a higher specific surface area. In order to increase the specific surface area, the chemical reduction method is generally used to prepare amorphous alloy catalysts. In Journal of Catalysis 150, 434-438, 1994, it was reported that 2.5M KBH 4 The aqueous solution is added dropwise to 0.1M nickel acetate ethanol solution under stirring at 298K, and the precipitate is washed su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/44B01J23/75B01J23/745B01J23/46B01J23/42C07B31/00C07B37/04C07B45/06C07C15/54C07C2/86C07C321/30C07C319/14
Inventor 李辉徐烨李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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