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Metal catalyst with nuclear shell structure and preparation method and application of metal catalyst

A metal catalyst, core-shell structure technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of unstable shell metal performance, blocking contact, and difficulty in protecting the nano-metal core. and other problems, to achieve the effect of controllable catalytic performance, long life and excellent catalytic performance.

Inactive Publication Date: 2013-10-16
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most commonly used method for preparing metal catalysts with a core-shell structure is to prepare metal nanoparticles first, and then form a metal shell on the surface of the metal nanoparticles through a displacement reaction. The disadvantage of this method is that the properties of the shell metal are unstable and difficult to Play the role of protecting the nano-metal core
And the formed metal shell may be a dense structure, which blocks the contact between the reaction substrate and the nano-metal core.

Method used

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  • Metal catalyst with nuclear shell structure and preparation method and application of metal catalyst
  • Metal catalyst with nuclear shell structure and preparation method and application of metal catalyst
  • Metal catalyst with nuclear shell structure and preparation method and application of metal catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add 0.0147g Na 2 PdCl 4 Dissolve in 50ml of deionized water, then add 1.0ml of oleylamine, stir thoroughly and ultrasonically to obtain a stable metal salt solution, stir at 80°C for 1 hour.

[0028] (2) Add 0.0216g KBH at 20°C 4 Dissolve in 0.4ml deionized water, add dropwise to the above metal salt solution, black particles are gradually formed in the solution.

[0029] (3) Remove the water solvent from the black particle solution formed above by rotary evaporation, and then wash with a mixed solution of absolute ethanol and cyclohexane for 3 to 5 times.

[0030] (4) The above-mentioned black particles are dispersed in cyclohexane, and the concentration of the metal particles is 0.0012mol / L;

[0031] (5) Add 2.0ml of CO-520, 1ml of ammonia water, and 0.1ml of ethyl orthosilicate to the above 15ml metal particle solution in sequence at 20-30°C, stir for 2-5 hours, and then wash with methanol for 3-5 times. And calcined at 400°C in the air for 4 hours to obtain ...

Embodiment 2

[0034] The catalyst described in Example 1 was applied to the CO catalytic oxidation reaction. That is: put 10mg of catalyst into a miniature gas-solid phase reactor, pass H 2 , activated at 100°C for 4 hours. Then pass into CO, N 2 , O 2 The mixed gas (V%=1:79:20) was used to investigate the performance of CO catalytic oxidation at different reaction temperatures. The reaction product is detected online by gas chromatography equipped with a TDX-01 chromatographic column and a TCD detector. All activity data have been repeated more than three times, and the error range is within 5%. The catalytic performance is shown in image 3 shown.

[0035] The life test of the catalyst for CO oxidation at a reaction temperature of 170°C Figure 4 shown.

Embodiment 3

[0037] (1) Add 0.0147g Na 2 PdCl 4 Dissolve in 50ml of deionized water, then add 1.0ml of oleylamine, stir thoroughly and ultrasonically to obtain a stable metal salt solution, stir at 80°C for 1 hour.

[0038] (2) Add 0.0216g KBH at 20°C 4 Dissolve in 0.4ml deionized water, add dropwise to the above metal salt solution, black particles are gradually formed in the solution.

[0039] (3) Remove the water solvent from the black particle solution formed above by rotary evaporation, and then wash with a mixed solution of absolute ethanol and cyclohexane for 3 to 5 times.

[0040] (4) The above-mentioned black particles are dispersed in cyclohexane, and the concentration of the metal particles is 0.0012mol / L;

[0041] (5) Put 0.1g SiO at 20~30℃ 2 Add the above 15ml metal particle solution, stir for 2 to 5 hours, then wash with methanol for 3 to 5 times, and bake at 400°C in the air for 4 hours to obtain a supported metal catalyst. 2 Indicated at -400°C.

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Abstract

The invention discloses a metal catalyst with a nuclear shell structure and a preparation method and application of the metal catalyst. The particle size of the metal catalyst is 15 to 30 nanometers and the active specific surface area of the metal catalyst is 8 to 20 square meters per gram; and the metal catalyst has the nuclear shell structure. By a micro emulsion technology, the preparation ofthe metal catalyst with the nuclear shell structure and the particle size of 15 to 30 nanometers is realized. The metal catalyst with the nuclear shell structure can be used as a catalyst for oxidizing carbon monoxide; the catalysis performance of the metal catalyst is better than that of a common loading catalyst and the catalysis performance of the metal catalyst can be controlled; and the lifeof the metal catalyst is much longer than that of the common loading catalyst.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a metal catalyst with a core-shell structure and its preparation method and application. Background technique [0002] Catalyst activity, selectivity and stability are key considerations in catalyst design. In the past few decades, with the development of nanotechnology, more and more colloidal metal nanoparticles have been applied to the field of catalysis. Some stabilizers, such as polymers and surfactants, are usually used in the preparation of colloidal metal nanoparticles to prevent the agglomeration of metal nanoparticles. These stabilizers partially cover the active sites of metal catalysts, resulting in reduced catalytic activity. Most of these stabilizers are removed by high-temperature calcination, and the high-temperature calcination process will lead to agglomeration or even sintering of metal nanoparticles, thereby reducing the activity of the catalyst. Therefore, how to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01J35/02C01B31/20B01J35/00C01B32/50
Inventor 李辉徐烨马金强李和兴
Owner SHANGHAI NORMAL UNIVERSITY