Supermolecule crystal material based platinum nano-catalyst and preparation and application thereof

A technology of supramolecular crystals and catalysts, applied in the preparation of amino compounds, organic compounds, physical/chemical process catalysts, etc., can solve the problem that the size of noble metal nanoparticles cannot be controlled from the atomic scale, and achieve mild preparation conditions and convenient operation , a wide range of effects

Inactive Publication Date: 2015-02-25
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of introducing noble metal nanoparticles by impregnation cannot control the size of the final noble metal nanoparticles from the atomic scale.

Method used

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  • Supermolecule crystal material based platinum nano-catalyst and preparation and application thereof
  • Supermolecule crystal material based platinum nano-catalyst and preparation and application thereof
  • Supermolecule crystal material based platinum nano-catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: M-Pt-Me 10 Preparation of CB[5](M=Li, Na, K, Rb, Cs) Supramolecular Crystal Material

[0016] First, mix 0.1g MCl, 0.1g Me 10 CB[5] was dissolved in 20mL ultrapure water, and the clear MCl and Me were obtained under magnetic stirring 10 Mixed aqueous solutions of CB[5]. 20 mg H 2 PtCl 6 Dissolve in 20mL ultrapure water to form a clear solution. Then, slowly drop 20mL of MCl and Me 10 The mixed aqueous solution of CB[5] and 20mL H 2 PtCl 6 aqueous solution. By solution diffusion, a series of M-Pt-Me 10 CB[5] supramolecular crystal materials.

Embodiment 2

[0017] Example 2: M-Pt NPs-Me 10 CB[5](M=Li, Na, K, Rb, Cs) Catalyst Preparation

[0018] According to the M-Pt-Me that embodiment 1 obtains 10 CB[5] supramolecular crystal material, the required M-Pt NPs-Me can be obtained by reducing at 200°C for 4 hours in a hydrogen atmosphere (a mixture of 5% hydrogen and 95% nitrogen by volume) 10 CB[5] catalyst.

Embodiment 3

[0019] Example 3: M-Pt NPs-Me 10 CB[5](M=Li, Na, K, Rb, Cs) Catalyzed Hydrogenation of Nitrobenzene

[0020] Nitrobenzene (1mmol), absolute ethanol (3ml) and M-Pt NPs-Me 10 CB[5] (5×10 -3 mmol) catalyst together into the test tube, after the test tube is sealed with a stopper, it is first evacuated and then filled with hydrogen. After repeated five times of vacuuming and filling with hydrogen, the mixture was reacted in a hydrogen (1.0 atm) atmosphere at a temperature of 35° C. and a stirring speed of 600 r / min. After 90 minutes of reaction, the catalyst was centrifuged, and the yield was measured by gas chromatography.

[0021] Thereafter, K-Pt NPs-Me 10 The CB[5] catalyst continued the catalytic reaction of Example 2. After five reactions, the yield did not decrease significantly, and the Pt NPs did not significantly agglomerate.

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Abstract

The invention provides supermolecule crystal material based platinum nano-catalyst and a preparation method and application thereof. The preparation method is characterized by including steps of utilizing platinum and Me10CB [5] and preparing a series of M-Pt-Me10CB [5] (M=Li, Na, K, Rb, Cs) supermolecule crystal materials under the induction action of different alkali metal by a conventional solution diffusion method. The supermolecule crystal materials can prepare platinum nanoparticles-Me10CB [5] nano-composite catalyst with different particle sizes under the condition of hydrogen reduction. The supermolecule crystal material based platinum nano-catalyst has high catalytic activity and stability, can catalyze hydrogenation reaction of nitrobenzene under the mild condition and can be repeatedly used. The preparation method has the advantages of simplicity in process, low cost, convenience in operation, good application effect and the like.

Description

technical field [0001] The invention relates to a preparation method of a platinum nano-catalyst based on a supramolecular crystal material. Using metal platinum and decamethyl five-membered melon ring (Me 10 CB[5]), under the induction of different alkali metals, by the conventional solution diffusion method, the formation of M-Pt-Me 10 CB[5] (M=Li, Na, K, Rb, Cs) supramolecular crystal material. Under hydrogen reduction conditions, platinum nanoparticles with different particle sizes-Me 10 A CB[5] nanocomposite catalyst, which can be used for catalytic hydrogenation reaction under mild conditions, belongs to the field of catalyst materials. Background technique [0002] Noble metal nanoparticles are widely used as catalysts due to their small size and high surface activity. Because the particle has no pores, it can avoid some side reactions caused by the slow diffusion of reactants to the inner pores, so its activity and selectivity are higher than similar traditional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C07C209/36C07C211/46
Inventor 李红芳曹荣
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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