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Method for preparing amorphous nanometer rhodium palladium alloy and catalytic application thereof

An amorphous, nano-rhodium technology, applied in nanotechnology, nanotechnology, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as unsatisfactory selectivity, and achieve high selectivity and high yield , the effect of low reaction temperature

Active Publication Date: 2014-05-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pd as a catalyst to catalyze the hydrogenation of phenylacetylene has high activity, but the selectivity is not ideal

Method used

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  • Method for preparing amorphous nanometer rhodium palladium alloy and catalytic application thereof
  • Method for preparing amorphous nanometer rhodium palladium alloy and catalytic application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0014] At 25°C, weigh 2mg of rhodium acetylacetonate and 1.5mg of palladium acetylacetonate, add them to 5ml of oleylamine, then add 60μL of tri-n-octylphosphine, put the above mixture into a 25ml beaker, and ultrasonicate for 20min at 25°C, then Stir magnetically at 25°C for 20 minutes; transfer the reaction solution to a 10ml autoclave, react at 200°C for 16 hours, and centrifuge the slurry after reaction for 3 times with a mixed solvent of ethanol and cyclohexane with a volume ratio of 10:1 at 70°C , the precipitate after centrifugation was dispersed in 4mL of cyclohexane to obtain an amorphous nano-rhodium-palladium alloy, the particle size of which was 5nm, and the dispersion was uniform.

[0015] The amorphous nano-rhodium-palladium alloy prepared above is used as a catalyst to catalyze the hydrogenation of phenylacetylene to prepare styrene. The reaction conditions are: the reaction temperature is 30 ° C, the reaction pressure is normal pressure, the catalyst amorphous n...

Embodiment 2

[0017] At 25°C, weigh 1.3mg of rhodium acetylacetonate and 2mg of palladium acetylacetonate, add them to 5ml of oleylamine, then add 60μL of tri-n-octylphosphine, put the above substances into a 25ml beaker, and ultrasonically for 20min at 25°C, then Stir magnetically at 25°C for 20 minutes; transfer the slurry to a 10ml reactor, and react at 200°C for 16 hours. The precipitate after centrifugation was dispersed in 4 mL of cyclohexane to obtain an amorphous nano-rhodium-palladium alloy, the particle size of which was 4.9 nm, and the dispersion was uniform.

[0018] The amorphous nano-rhodium-palladium alloy prepared above is used as a catalyst to catalyze the hydrogenation of phenylacetylene to prepare styrene. The reaction conditions are: the reaction temperature is 30 ° C, the reaction pressure is normal pressure, the catalyst amorphous nano-rhodium-palladium alloy and the reaction substrate phenylacetylene The molar ratio is 1:1200, and the reaction time is 2.5h.

[0019] ...

Embodiment 3

[0020] At 25°C, weigh 2.6 mg of rhodium acetylacetonate and 1 mg of palladium acetylacetonate, add them to 5 ml of oleylamine, and then add 100 μL of tri-n-octylphosphine, add the above substances into a 25 ml beaker, and ultrasonicate for 20 minutes at 25°C, then Stir magnetically at 25°C for 20 minutes; transfer the slurry to a 10ml reactor, and react at 200°C for 16h. After the reaction, the slurry is centrifuged and washed 3 times with a mixed solvent of ethanol and cyclohexane with a volume ratio of 10:1 at 65°C. The precipitate after centrifugation was dispersed in 4 mL of cyclohexane to obtain an amorphous nano-rhodium-palladium alloy, the particle size of which was 5.2 nm, and the dispersion was uniform.

[0021] The amorphous nano-rhodium-palladium alloy prepared above is used as a catalyst to catalyze the hydrogenation of phenylacetylene to prepare styrene. The reaction conditions are: the reaction temperature is 30 ° C, the reaction pressure is normal pressure, the c...

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Abstract

The invention discloses a method for preparing amorphous nanometer rhodium palladium alloy, and belongs to the technical field of manufacturing of nanometer material. According to the method, oleylamine is selected as solvent and reducing agent, tri-n-octylphosphine is selected as protecting agent, and even and disperse amorphous nanometer rhodium palladium alloy is manufactured with a pyrosol reduction method. The method has the advantages of being simple in step and high in yield, and the prepared nanometer particles are small and even in particle diameter and good in reproducibility. The prepared amorphous nanometer rhodium palladium alloy serves as catalyst to be applied into a reaction for manufacturing styrene through phenylacetylene hydrogenation, the reactant conversion rate is high, the selectivity of products is high, and stability of the catalyst is good.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a method for preparing an amorphous nanometer-level rhodium-palladium alloy and its catalytic application. Background technique [0002] Due to the particularity of its structure, amorphous alloy materials have excellent physical, chemical, mechanical, mechanical and other properties, such as high corrosion resistance, high magnetic permeability, low loss magnetic core, superconductivity and catalysis, and are called "Material of the Century". Amorphous alloys have the structural characteristics of short-range order and long-range disorder. This structure is conducive to the adsorption of reactants, and at the same time has uniformly distributed active sites. These active sites are all unsaturated, which is conducive to the transformation of reaction products. . Although the study of amorphous alloys as catalytic materials started late, it has progr...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00C22C45/00B01J23/46C07C15/46C07C5/05B82Y30/00B82Y40/00
Inventor 卫敏任梦蕊陈嘉乐段雪
Owner BEIJING UNIV OF CHEM TECH
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