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High stability nanogold catalyst and preparation method thereof

A high-stability, nano-gold technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve long reaction time, high reaction temperature, preparation process Complex problems, to achieve the effect of high activity and stability, good repeatability, and simple process

Active Publication Date: 2014-05-14
SHANDONG ZHAOJIN GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the above methods require multi-step reaction steps, higher reaction temperature and longer reaction time, and the overall preparation process is more complicated, which is not conducive to large-scale production, and is difficult to popularize and apply in industrial production.
It is especially important that the shell of the traditional Yolk-Shell structure material does not have a regular interpenetrating microporous structure, so it is difficult to give full play to the core catalyst in the field of catalysis and other related applications with molecular and material transport as the basic characteristics. performance

Method used

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  • High stability nanogold catalyst and preparation method thereof
  • High stability nanogold catalyst and preparation method thereof
  • High stability nanogold catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of a highly stable nano-gold catalyst, the steps are as follows:

[0041] Dissolve 1.1 grams of polyvinylpyrrolidone, 0.4 grams of silver nitrate, 3.2 milligrams of copper chloride, 720 microliters of 25% ammonia, 0.16 grams of chloroauric acid, and 0.16 grams of chloroplatinic acid in 32 milliliters of ethylene glycol , to prepare mixed solution A;

[0042]Transfer the mixed solution A to a reaction kettle, then place it in an oven, react at 200°C for 240 minutes, stop heating and cool to room temperature naturally, centrifuge at 13,000 rpm for 5 minutes, take the precipitate and mix it with 100 ml of ethanol, 13,000 Centrifuge for 5 minutes at rpm, mix the precipitate with 100 ml of water, centrifuge at 13,000 rpm for 5 minutes, and collect the precipitate to obtain gold / silver / platinum layered structure nanoparticles.

[0043] The above-mentioned gold / silver / platinum layered structure nanoparticles were redispersed in 20 milliliters of water to ...

Embodiment 2

[0049] A preparation method of a highly stable nano-gold catalyst, the steps are as follows:

[0050] Dissolve 1.1 grams of polyvinylpyrrolidone, 0.4 grams of silver nitrate, 3.2 milligrams of copper chloride, 720 microliters of 25% ammonia water, 0.12 grams of chloroauric acid, and 0.12 grams of chloroplatinic acid in 32 milliliters of ethylene glycol , to prepare mixed solution A;

[0051] Transfer the mixed solution A to a reaction kettle, then place it in an oven, react at 200°C for 240 minutes, stop heating and cool to room temperature naturally, centrifuge at 13,000 rpm for 5 minutes, take the precipitate and mix it with 100 ml of ethanol, 13,000 Centrifuge for 5 minutes at rpm, mix the precipitate with 100 ml of water, centrifuge at 13,000 rpm for 5 minutes, and collect the precipitate to obtain gold / silver / platinum layered structure nanoparticles.

[0052] The above-mentioned gold / silver / platinum layered structure nanoparticles were redispersed in 40 milliliters of wa...

Embodiment 3

[0055] A preparation method of a highly stable nano-gold catalyst, the steps are as follows:

[0056] Dissolve 1.1 grams of polyvinylpyrrolidone, 0.4 grams of silver nitrate, 3.2 milligrams of copper chloride, 720 microliters of ammonia water with a mass concentration of 25%, 0.16 grams of chloroauric acid, and 0.16 grams of chloroplatinic acid in 32 milliliters of dimethylformamide In, mixed solution A was prepared;

[0057] Transfer the mixed solution A to a reaction kettle, then place it in an oven, react at 160°C for 240 minutes, stop heating and cool to room temperature naturally, centrifuge at 13,000 rpm for 5 minutes, take the precipitate and mix it with 100 ml of ethanol, 13,000 Centrifuge for 5 minutes at rpm, mix the precipitate with 100 ml of water, centrifuge at 13,000 rpm for 5 minutes, and collect the precipitate to obtain gold / silver / platinum layered structure nanoparticles.

[0058] The above-mentioned gold / silver / platinum nanoparticle with layered structure w...

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Abstract

The invention relates to a high stability nanogold catalyst and a preparation method thereof. The nanogold catalyst is of a Yolk-Shell structure, the platinum is a shell, the gold is a core, and a gap for allowing a gold core to move is formed between the shell and the core. The preparation method of the high stability nanogold catalyst adopts dimethylformamide, polyhydric alcohols, an inorganic silver salt precursor, an inorganic platinum salt precursor, an inorganic silver salt precursor and a surface active agent as reaction raw materials, ammonia water, an inorganic salt containing halide ions and copper-containing inorganic salt as addition agents, the reaction raw materials and the additional agents react to synthesize gold / silver / platinum nano-particles with layered structure, and then silver is corroded by nitric acid, so as to obtain the high stability nanogold catalyst. The high stability nanogold catalyst and the preparation method provided by the invention have the advantages that the prepared non-loaded nanogold particles are packed by a multi-hole shell, so that the nanogold particles can keep high activity and stability, and influence of a carrier on the nanogold particles are also avoided.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a high-stability nano-gold catalyst and a preparation method thereof, and belongs to the technical field of inorganic functional nanometer materials. Background technique [0002] Since Professor Haruta of Japan discovered in the 1980s that gold (Au) nanoparticles loaded on transition metal oxides exhibited high catalytic activity for low-temperature oxidation of carbon monoxide (CO) (J.Catal.115,1989: 301- 309), gold catalysts have attracted much attention. Subsequent studies have found that gold nanoparticles exhibit good catalytic activity and selectivity in many important organic reactions, such as the oxidation of alcohols and aldehydes, the hydrogenation of unsaturated bonds, the oxidation of silanes, and the epoxidation of propylene. Compared with bulk gold, gold nanoparticles have a larger specific surface area, so it has better catalytic activity. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J35/02B82Y30/00
Inventor 丁轶李守生程泰熊海岩柳华杰
Owner SHANDONG ZHAOJIN GROUP
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