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A non-crystal alloy catalyst as well as its preparing method and purpose

A technology of amorphous alloys and catalysts, applied in the field of amorphous alloy catalysts and their preparation, can solve problems such as difficult product separation, low nanoparticle content, and unsuitability for practical applications, and achieve obvious catalytic effects

Inactive Publication Date: 2008-04-09
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is a commonly used technology to prepare nanoparticles with uniform and controllable particle size by water-in-oil microemulsion, but the content of nanoparticles obtained by this method is less, which is not suitable for practical application; moreover, this method needs to use a large amount of organic solvents, which not only causes Environmental pollution, also makes product separation difficult

Method used

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  • A non-crystal alloy catalyst as well as its preparing method and purpose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) 1.19g CoCl 2 ·6H 2 O and 5.0 g of polyethylene glycol were dissolved in 40 mL of deionized water, and 10 mL of cyclohexane was added, fully stirred and mixed to obtain an oil-in-water microemulsion.

[0021] 2) Add 10mL of 2.0mol / L KBH at 20°C 4 When the aqueous solution is added to the above-mentioned oil-in-water microemulsion, black particles are gradually formed in the solution, and gas emerges.

[0022] 3) The black particles formed above were washed successively with water and absolute ethanol for 3 to 5 times respectively to obtain a Co-B amorphous alloy sample, represented by Co-B-10.

[0023] Fig. 1 is the XRD spectrogram of the sample prepared in this embodiment, the sample that can be determined from the diffuse peak shape of its about 45 ° position is amorphous; Fig. 2 is the TEM photo of the sample prepared in this embodiment, from photo It can be seen that the obtained sample is a spherical particle with a uniform particle size distribution, a smooth...

Embodiment 2

[0026] 1) 1.19g CoCl 2 ·6H 2 O and 5.0 g of polyethylene glycol were dissolved in 40 mL of deionized water, and 4 mL of cyclohexane was added, fully stirred and mixed to obtain an oil-in-water microemulsion.

[0027] 2) Add 10mL of 2.0mol / L KBH at 25°C 4 When the aqueous solution is added to the above-mentioned oil-in-water microemulsion, black particles are gradually formed in the solution, and gas emerges.

[0028] 3) The black particles formed above were washed successively with water and absolute ethanol for 3 to 5 times respectively to obtain a Co-B amorphous alloy sample, represented by Co-B-4.

[0029] The particle size of the sample prepared in this embodiment is 20nm.

[0030] The catalytic performance of the catalyst obtained in this example in the hydrogenation reaction of liquid-phase cinnamaldehyde to prepare cinnamyl alcohol is shown in Table 1.

Embodiment 3

[0032] 1) 1.19g CoCl 2 ·6H 2 O and 5.0 g of cetyltrimethylammonium bromide were dissolved in 40 mL of deionized water, and 8 mL of cyclohexylamine was added, fully stirred and mixed to obtain an oil-in-water microemulsion.

[0033] 2) Dissolve 15mL of 2.0mol / L NaBH at 0°C 4 When the aqueous solution is added to the above-mentioned oil-in-water microemulsion, black particles are gradually formed in the solution, and gas emerges.

[0034] 3) The black particles formed above were washed successively with water and absolute ethanol for 3 to 5 times respectively to obtain a Co-B amorphous alloy sample, represented by Co-B-8.

[0035] The particle size of the sample prepared in this embodiment is 10 nm.

[0036] The catalytic performance of the catalyst obtained in this example in the hydrogenation reaction of liquid-phase cinnamaldehyde to prepare cinnamyl alcohol is shown in Table 1.

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Abstract

The invention discloses amorphous alloy catalyst with controllable grain size being smaller than 50 nm and uniform grain size distribution, and adds a new variety for the prior amorphous alloy catalyst field. The activity ratio surface area of the amorphous alloy catalyst is 10 to 50 m<2> / g, the particle diameter can be controlled in the range of 2 to 50 nm, and the grain size distribution is uniform. The invention realizes the amorphous alloy catalyst with the grain size being smaller than 50 nm and achieves the controllable grain size and the uniform grain size distribution through the preparation method for controlling the reduction reaction rate by oil in water microemulsion. The amorphous alloy catalyst of the invention can be taken as hydrogenation catalyst containing unsaturated functional group compounds such as alkene, alkyne, arene, nitrile, nitro compound, carbonyl compound, etc., not only the catalytic performance is superior to the catalytic performance of the ordinary amorphous alloy catalyst, but also the catalytic performance can be controlled; the life of the catalyst is longer than the life of the ordinary amorphous alloy catalyst, and the catalyst can be recovered and reused time after time.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to an amorphous alloy catalyst and its preparation method and application. 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 successively with 6 milliliters of 8 M ammon...

Claims

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Application Information

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IPC IPC(8): B01J23/74B01J23/56B01J21/02C07B35/02
Inventor 李辉李和兴刘俊
Owner SHANGHAI NORMAL UNIVERSITY
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