Supported gold catalyst, preparation method thereof, and p-aminophenol preparation method

A technology for p-aminophenol and gold catalysts, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, preparation of organic compounds, etc., can solve the problems of large particles, influence of catalyst activity, etc. The method is simple, the preparation cost is reduced, and the aggregation effect is reduced

Active Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is relatively simple, but the particles of nano gold in the obtained catalyst are still relatively large (5-10nm), which has a certain influence on the activity of the catalyst.

Method used

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  • Supported gold catalyst, preparation method thereof, and p-aminophenol preparation method
  • Supported gold catalyst, preparation method thereof, and p-aminophenol preparation method
  • Supported gold catalyst, preparation method thereof, and p-aminophenol preparation method

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preparation example Construction

[0028] According to the preparation method described in the second aspect of the present invention, when the molar ratio of the amount of gold source, protective agent, reducing agent and silicon dioxide is 1:10-250:0.5-5:200-700, it can To obtain the supported gold catalyst of the present invention, in a preferred situation, the molar ratio of the gold source, protective agent, reducing agent and silicon dioxide is 1:10-100:1-2.5:300-500.

[0029] According to the preparation method described in the second aspect of the present invention, the amount of water used is not particularly limited, as long as the gold source, protective agent and reducing agent can be fully dissolved, preferably, the amount of water used can make the gold source The molar concentration of gold in the reaction solution of the protective agent and the reducing agent is 0.5-2mmol / L, more preferably 0.5-1mmol / L.

[0030] According to the preparation method described in the second aspect of the present i...

Embodiment 1

[0057] Take 5mL of 2mM HAuCl 4 Aqueous solution, adding 5 mL of polyvinylpyrrolidone (PVP) k-30 aqueous solution with a concentration of 20 mM, stirring vigorously at a speed of 1200 r / min for 5 min under an ice bath, and then adding 0.6 mL of NaBH with a concentration of 40 mM to the mixed solution 4 The aqueous solution was vigorously stirred at a speed of 1200r / min for 2min to obtain a brown gold nanoparticle sol.

[0058] Another 200mg silica airgel (porosity 95%, average pore diameter 20nm, specific surface area 750m2) passed through a 70 mesh sieve 2 / g), dispersed in the mixed solution of 10mL water and 4mL ethanol, after gently stirring at a speed of 450r / min for 5min, add the prepared nano-gold particle sol, and gently stir at a speed of 450r / min for 12h.

[0059] The resulting mixture was allowed to stand for stratification, the upper layer was a colorless aqueous phase, and the lower layer was a brown gel phase. The upper layer was decanted, and the insoluble matt...

Embodiment 2

[0063] Take 5mL of 2mM HAuCl 4Aqueous solution, add 5 mL of polyvinyl alcohol (PVA) aqueous solution with a concentration of 11 mM, stir vigorously at a speed of 1000 r / min for 3 min in an ice bath, and then add 0.5 mL of NaBH with a concentration of 30 mM to the mixed solution 4 The aqueous solution was vigorously stirred at a speed of 1000 r / min for 1 min to obtain a brown gold nanoparticle sol.

[0064] Another 250mg silica airgel (porosity 92%, average pore diameter 30nm, specific surface area 720m2) passed through a 40 mesh sieve 2 / g), dispersed in the mixed solution of 10mL water and 2mL ethanol, after gently stirring at a speed of 400r / min for 3min, add the prepared nano-gold particle sol, and gently stir at a speed of 450r / min for 10h.

[0065] The resulting mixture was allowed to stand for stratification, the upper layer was a colorless aqueous phase, and the lower layer was a brown gel phase. The upper layer was decanted, and the insoluble matter of the obtained g...

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Abstract

The invention discloses a supported gold catalyst, a preparation method and an application thereof, and a p-aminophenol preparation method. The supported gold catalyst contains silica and nano-gold particles supported on the silica, the particle size of the supported gold catalyst is not greater than 0.6mm, the average aperture is 10-70nm, and the particle size of the nano-gold particles is 1-5nm. The supported gold catalyst has the advantages of simple preparation method, low cost, good catalysis performance, good repeatability, and good dispersion and small dimensions of the supported nano-gold particles.

Description

technical field [0001] The invention relates to a supported gold catalyst, a preparation method and application thereof, and a method for preparing p-aminophenol. Background technique [0002] Since Haruta et al. found that highly dispersed gold catalysts have high catalytic activity for low-temperature complete oxidation of CO, gold catalysts have attracted the attention of many researchers. According to the current research, an important prerequisite for the high activity of supported gold catalysts is to prepare nano-sized, highly dispersed gold particles. Individual nanoparticles are easy to agglomerate due to their high surface energy, so it is necessary to load these small particles on a suitable carrier with a high specific surface area to maintain high dispersion of nanoparticles. [0003] At present, the preparation methods of supported gold catalysts with high activity mainly include impregnation method, co-precipitation method, deposition precipitation method, ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J35/10C07C213/02C07C215/76
Inventor 郑俊鹏李森郭鸣明
Owner CHINA PETROLEUM & CHEM CORP
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