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Preparation of loaded bimetallic nano-catalyst

A bimetallic nano-catalyst technology, applied in the preparation of organic compounds, metal/metal oxide/metal hydroxide catalysts, carbon-based compounds, etc., can solve the problems of low catalytic oxidation activity and achieve high catalytic activity, Simple preparation method and less catalyst loss

Inactive Publication Date: 2012-11-14
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most catalysts have very low catalytic oxidation activity for aliphatic primary alcohols, which is also a major problem for alcohol oxidation systems.

Method used

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  • Preparation of loaded bimetallic nano-catalyst

Examples

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Comparison scheme
Effect test

example 1

[0021] Example 1: Preparation of 0.5%Pd-0.6%Au / LDH catalyst

[0022] Step 1, the preparation of magnesium aluminum hydrotalcite: 0.03mol Mg(NO 3 ) 2 ·6H 2 O, 0.015mol Al(NO 3 ) 3 9H 2 O, 0.21mol urea, and 50mL deionized water were mixed evenly, and then slowly heated to 105°C under stirring. When the temperature began to exceed 90°C, urea began to decompose, and gas escaped from the solution continuously. After about 1 hour, the solution From clarification to turbidity, after a period of time, it becomes a slurry, which is maintained at 105°C for dynamic crystallization for 10 hours, followed by static crystallization for 20 hours. After the crystallization, filter with suction, wash with deionized water several times until the pH of the filtrate becomes neutral, and then dry at 60°C for 12 hours to obtain magnesium aluminum hydrotalcite (LDH).

[0023] The preparation of step 2, the palladium-gold bimetallic nanoparticle catalyst supported by magnesium aluminum hydrotal...

example 2

[0024] Example 2: Preparation of 0.5%Pd-0.8%Au / LDH catalyst

[0025] Step 1, the preparation of magnesium aluminum hydrotalcite: 0.03mol Mg(NO 3 ) 2 ·6H 2 O, 0.015mol Al(NO 3 ) 3 9H 2 O, 0.21mol urea, and 50mL deionized water were mixed evenly, and then slowly heated to 105°C under stirring. When the temperature began to exceed 90°C, urea began to decompose, and gas escaped from the solution continuously. After about 1 hour, the solution From clarification to turbidity, after a period of time, it becomes a slurry, which is maintained at 105°C for dynamic crystallization for 10 hours, followed by static crystallization for 20 hours. After the crystallization, filter with suction, wash with deionized water several times until the pH of the filtrate becomes neutral, and then dry at 60°C for 12 hours to obtain magnesium aluminum hydrotalcite (LDH).

[0026] The preparation of step 2, the palladium-gold bimetallic nanoparticle catalyst supported by magnesium aluminum hydrotal...

example 3

[0027] Example 3: Preparation of 0.5%Pd-1.0%Au / LDH catalyst

[0028] Step 1, the preparation of magnesium aluminum hydrotalcite: 0.03mol Mg(NO 3 ) 2 ·6H 2 O, 0.015mol Al(NO 3 ) 3 9H 2 O, 0.21mol urea, and 50mL deionized water were mixed evenly, and then slowly heated to 105°C under stirring. When the temperature began to exceed 90°C, urea began to decompose, and gas escaped from the solution continuously. After about 1 hour, the solution From clarification to turbidity, after a period of time, it becomes a slurry, which is maintained at 105°C for dynamic crystallization for 10 hours, followed by static crystallization for 20 hours. After the crystallization, filter with suction, wash with deionized water several times until the pH of the filtrate becomes neutral, and then dry at 60°C for 12 hours to obtain magnesium aluminum hydrotalcite (LDH).

[0029] The preparation of step 2, the palladium-gold bimetallic nanoparticle catalyst supported by magnesium aluminum hydrotal...

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Abstract

The invention relates to a kind of Mg-Al hydrotalcite loaded bimetallic nano-catalyst and its preparation method, and relates to application of the catalyst system in oxidation of alcohol into corresponding carbonyl compounds. The catalyst preparation method consists of: 1) preparing an Mg-Al hydrotalcite carrier through a urea decomposition method; 2) loading the precursors of metal Pd and Au on the Mg-Al hydrotalcite surface; and 3) then reducing Pd (II) and Au (III) through NaBH4, thus obtaining the bimetallic nanometer particle catalyst. The catalyst provided in the invention has the advantages of high catalytic activity, good stability, separability, and easy recovery, thus being applicable to alcohol oxidation reactions in aqueous phases.

Description

Technical field: [0001] The invention relates to a catalytic system of supported bimetallic nanoparticles, in particular to a catalytic system of palladium-gold bimetallic nanoparticles supported by a solid base. [0002] The present invention also relates to the use of the above-mentioned catalytic system for catalyzing the oxidation of alcohols to the corresponding carbonyl compounds. Background technique: [0003] The oxidation of alcohols to corresponding carbonyl compounds is a relatively common type of reaction, which plays an important role in organic synthesis. Using traditional methods to complete this type of reaction usually requires an equivalent amount of inorganic oxidants (such as high-valent manganese and chromium, etc.), which is not only expensive, but also causes great pollution to the environment. Considering both environmental protection and economy, oxygen or air is cheap, easy to obtain, clean and pollution-free, and is an ideal oxidant. Therefore, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J23/44C07C47/54C07C45/38C07C51/235C07C53/126
Inventor 侯震山石玉曹婷华丽朱闻闻郁茵茵
Owner EAST CHINA UNIV OF SCI & TECH
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