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Method for preparing load type high-dispersion multi-component precious metal nanoparticle catalyst

A nanoparticle and precious metal technology is applied in the field of preparation of supported high-dispersion multi-component precious metal nanoparticle catalysts, which can solve the problems of uneven component distribution, large metal loading, and low metal dispersion, and achieve high catalytic activity. and stability, uniform particle size and uniform particle size distribution

Inactive Publication Date: 2013-03-20
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size and composition of the active component of the supported catalyst prepared by the traditional preparation method are often uneven and difficult to control, and the metal dispersion is low, the metal loading is large, easy to agglomerate, and the production cost is high.

Method used

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  • Method for preparing load type high-dispersion multi-component precious metal nanoparticle catalyst
  • Method for preparing load type high-dispersion multi-component precious metal nanoparticle catalyst
  • Method for preparing load type high-dispersion multi-component precious metal nanoparticle catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 100 mL of ethylene glycol and add it into a three-necked flask, then add 1 mL of oleic acid and 1 mL of oleylamine, and stir and mix evenly at room temperature under an argon atmosphere. Dissolve 1mmol of copper acetate in 10mL of water, 1mmol of palladium acetate in 10mL of acetone solution, add the two solutions into the mixed solution of ethylene glycol, then heat up to 120°C, keep the temperature for 30 minutes, Continue to heat up to 200°C and keep the temperature constant for 90 minutes. After the reaction was completed, it was naturally cooled to room temperature, then 50 mL of n-hexane was added, and the mixture was allowed to stand for stratification, and the upper layer was the obtained nanoparticle solution. Take the solution of the nanoparticles in the upper layer and mix it with the carrier white carbon black of the catalyst, then stir for 24 hours, centrifuge, wash, dry in vacuum at 40 degrees, and obtain the loaded type after 4 hours, then add ethano...

Embodiment 2

[0029] Take 100 mL of ethylene glycol and add it into a three-necked flask, then add 1 mL of oleic acid and 1 mL of oleylamine, and stir and mix evenly at room temperature under an argon atmosphere. Dissolve 1mmol of copper acetate in 10mL of water, 1mmol of palladium acetate in 10mL of acetone solution, add the two solutions into the mixed solution of ethylene glycol, then heat up to 120°C, keep the temperature for 30 minutes, Continue to heat up to 200°C and keep the temperature constant for 60-90 minutes. After the reaction was completed, it was naturally cooled to room temperature, then 50 mL of n-hexane was added, and the mixture was allowed to stand for stratification, and the upper layer was the obtained nanoparticle solution. Get the solution of the upper nanoparticle and mix it with the carrier white carbon black of the catalyst, then stir for 24 hours, centrifuge, wash, dry, in 400 degrees 5% H 2 +Ar atmosphere and calcined for 3.5 hours to obtain the supported PdCu...

Embodiment 3

[0031]Take 100mL of ethylene glycol and add it into a three-necked flask, then add 1mL of oleic acid and oleylamine, and stir and mix evenly at room temperature under an argon atmosphere. Dissolve 1mmol of copper acetate in 5mL of water, 1mmol of palladium acetate in 5mL of acetone solution, add the two solutions into the mixed solution of ethylene glycol, then heat up to 120°C, keep the temperature for 30 minutes, Continue to heat up to 200°C and keep the temperature constant for 60-90 minutes. After the reaction was completed, it was naturally cooled to room temperature, and then 45 mL of n-hexane was added, and the mixture was allowed to stand for stratification, and the upper layer was the obtained nanoparticle solution. Get the solution of upper layer nanoparticle and the carrier aluminum oxide of catalyst and mix, then stir 24 hours, centrifuge, wash, dry, obtain loaded type PdCu two-component nanoparticle catalyst ( Figure 4 ).

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Abstract

The invention relates to a method for preparing a load type high-dispersion multi-component precious metal nanoparticle catalyst. The method comprises the steps of 1) under inert atmosphere, uniformly stirring a solvent and a surface active agent, then adding a precious metal precursor solution, rising the temperature, reacting for a certain period of time, cooling to the room temperature, adding normal hexane, and performing extraction layering; 2) uniformly mixing the obtained upper layer nanoparticle solution with a carrier, and stirring or performing ultrasonic treatment; and 3) centrifugating, washing and drying or baking the mixed solution to obtain the catalyst. For the precious metal catalyst, even under a relatively high carrying amount, relatively good precious metal nanoparticle dispersion degree can be still guaranteed; the particle sizes of the particles are uniformly distributed; the precious metal carrying amount is controlled easily and accurately; the particle sizes and the components of multi-component particles can be controlled; and the catalysis application range is wide. The process is simple; the preparation cost is low; the applicability is high; and load-type high-dispersion precious metal and the multi-component precious metal nanoparticle catalyst can be prepared in a large scale.

Description

technical field [0001] A method for preparing a supported highly dispersed multi-component noble metal nanoparticle catalyst, especially a supported type that can be used for electrochemical oxidation reactions of alcohols, carbon-carbon coupling reactions, olefin hydrogenation reactions, and liquid-phase oxidation of alcohols Reaction, hydrogen peroxide synthesis reaction, hydrodechlorination reaction of aqueous phase halogenated olefins and synthesis reaction of vinyl acetate and other aspects of the preparation method of multi-component noble metal nanoparticle catalysts. Background technique [0002] Supported noble metal nanocatalysts have attracted extensive attention from many researchers in the industry and scientific research circles due to their good catalytic performance, and have been widely used in energy fields, such as fuel cells; chemical fields, such as liquid-phase hydrogenation reactions. Among them, the supported catalysts with uniform particle size, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/52
Inventor 尹振谭小耀高建初园园
Owner TIANJIN POLYTECHNIC UNIV
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