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Porous carbon load noble metal catalyst and preparation method thereof

A precious metal catalyst, porous carbon technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of easy loss of nano-active centers, poor catalyst stability, use Life shortening and other problems, to achieve uniform morphology, stable performance, and improve the effect of affinity

Active Publication Date: 2015-12-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing studies have shown that supported nano-noble metal catalyst materials have excellent catalytic activity and selectivity, but are usually prepared by using the surface of porous carrier materials for loading, so nano-noble metal catalyst materials often have nano-active centers that are easy to lose, Problems such as poor stability of the catalyst greatly shorten its service life, thereby reducing the efficiency of its use

Method used

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  • Porous carbon load noble metal catalyst and preparation method thereof
  • Porous carbon load noble metal catalyst and preparation method thereof
  • Porous carbon load noble metal catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Place a three-necked flask containing 100mL of chloroauric acid aqueous solution (0.1g / L) in an oil bath at 100°C, and after uniformly heating up, add 1.4mL of sodium citrate aqueous solution (0.113g / mL) dropwise, and add dropwise after 12 minutes 1.4 mL of the above-mentioned sodium citrate solution was reacted for 1 hour, and then the heating was stopped and the temperature was lowered to room temperature to obtain a dispersion liquid containing gold nanoparticles. Add 3mL PVP aqueous solution (9.28wt%) in the obtained dispersion liquid, after stirring for 2 days, centrifuge at 10000r / min rotating speed for 30min, add deionized water after absorbing the supernatant, repeat the above-mentioned centrifugal washing step 2 times after ultrasonic dispersion for 5min, Surface-modified gold nanoparticles were obtained.

[0031] Mix 0.01 g of the above-mentioned surface-modified gold nanoparticles with 10 mL of absolute ethanol and 0.4 mL of deionized water and disperse ultra...

Embodiment 2

[0035] Place a three-necked flask containing 100mL of chloroauric acid aqueous solution (0.1g / L) in an oil bath at 100°C, and after uniformly heating up, add 1.6mL of sodium citrate aqueous solution (0.113g / mL) dropwise, and add dropwise after 12 minutes 1.6 mL of the above-mentioned sodium citrate solution was reacted for 1 h, and then the heating was stopped and the temperature was lowered to room temperature to obtain a dispersion liquid containing gold nanoparticles. Add 2.5mL PVP aqueous solution (9wt%) to the obtained dispersion, after stirring for 2 days, centrifuge at 10000r / min for 30min, add deionized water after absorbing the supernatant, and repeat the above centrifugal washing step 2 times after ultrasonic dispersion for 5min. Surface-modified gold nanoparticles were obtained.

[0036] Mix 0.01 g of the surface-modified gold nanoparticles obtained above with 10 mL of absolute ethanol and 0.4 mL of deionized water and disperse ultrasonically for 10 min to form a ho...

Embodiment 3

[0040] Place a three-necked flask containing 100mL of chloroauric acid aqueous solution (0.1g / L) in an oil bath at 105°C, and after uniform heating, add 1.6mL of sodium citrate aqueous solution (0.113g / mL) dropwise, and add dropwise after 12 minutes 1.6 mL of the above-mentioned sodium citrate solution was reacted for 1 h, and then the heating was stopped and the temperature was lowered to room temperature to obtain a dispersion liquid containing gold nanoparticles. Add 3 mL of PVP aqueous solution (10wt%) to the resulting dispersion, stir for 2 days, centrifuge at 12,000 r / min for 30 min, add deionized water after absorbing the supernatant, and repeat the above-mentioned centrifugal washing step 2 times after ultrasonic dispersion for 5 min to obtain Surface-modified gold nanoparticles.

[0041] Mix 0.01 g of surface-modified gold nanoparticles obtained above with 10 mL of absolute ethanol and 0.4 mL of deionized water and disperse ultrasonically for 10 min to form a homogene...

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Abstract

The invention relates to a porous carbon load noble metal catalyst and a preparation method thereof. The catalyst is prepared from porous cage-shaped carbon materials and noble metal nanometer particles distributed in the porous cage-shaped carbon materials. The preparation method of the catalyst includes the steps of firstly, adding a dispersing agent solution to noble metal nanometer dispersion liquid, removing supernate through centrifugal separation, and obtaining surface-decorated noble metal nanometer particles; secondly, mixing the surface-decorated noble metal nanometer particles with absolute ethyl alcohol and deionized water, dispersing the mixture evenly through ultrasonic waves, adding ammonia water and tetraethyl orthosilicate, and obtaining noble metal @SiO2 core-shell particles; thirdly, mixing the noble metal @SiO2 core-shell particles with PS micro-balloons, a carbon substrate material and a dilute sulphuric acid solution, dispersing the mixture evenly through ultrasonic waves to have a reaction at a temperature of 120 DEG C to 200 DEG C, conducting full carbonization and thermal treatment, putting the mixture into an HF solution to be treated for 10 h to 15 h after naturally cooling the mixture so that silicon dioxide can be removed, and finally conducting washing and drying to obtain the porous carbon load noble metal catalyst.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a porous carbon-supported noble metal catalyst and a preparation method thereof. Background technique [0002] As catalysts and catalyst carrier materials, inorganic porous materials have the advantages of high catalytic activity and selectivity, stable structure, simple preparation technology, low cost, simple post-processing, and reusability, and occupy a very important position in the application of industrial catalysts. It has been widely used in petroleum refining and chemical industry, such as FCC catalyst molecular sieve Y and ZSM-5. Inorganic porous materials are generally used in heterogeneous catalytic systems. The catalytic reaction process includes the diffusion and adsorption of reactants to the surface of the catalyst, the chemical reaction of reactants in the catalytic system, and the desorption and diffusion of reaction products from the catalyst. According to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/50B01J23/52
Inventor 陈丽华毛家玮欧阳逸挺余勇李昱邓兆苏宝连
Owner WUHAN UNIV OF TECH
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