A synthetic method of gold nanoparticle catalysts having a controllable dimension, gold catalysts and applications of the catalysts

A technology of gold nanoparticle and synthesis method, applied in the field of gold nanoparticle catalyst synthesis, can solve the problems of easy aggregation, poor stability, difficulty in large-scale production, poor monodispersity, etc., and achieves good high temperature stability, easy control, and avoidance of loss. and the effect of loss

Inactive Publication Date: 2017-06-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its poor aggregation stability, poor monodispersity, low yield, large waste of resources and difficult to achieve large-scale production

Method used

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  • A synthetic method of gold nanoparticle catalysts having a controllable dimension, gold catalysts and applications of the catalysts
  • A synthetic method of gold nanoparticle catalysts having a controllable dimension, gold catalysts and applications of the catalysts
  • A synthetic method of gold nanoparticle catalysts having a controllable dimension, gold catalysts and applications of the catalysts

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: 1wt% Au / TiO with a diameter of about 1 nanometer of Au nanoparticles 2 Synthesis.

[0034] The mass concentration is 0.084mg.ml -1 The polyvinyl alcohol was added to a concentration of 1.6 mM HAuCl 4 solution, stirred for 30min to mix well. Weigh 10.7-11.0 mg of .075 times the molar equivalent of NaBH 4 Dissolve in 40mL of deionized water, take half of it and pour it into the above-mentioned protected chloroauric acid mixed solution for direct reduction to obtain a purple-brown colloidal solution. Add carrier TiO directly after reducing 3-5mim 2 , the measured pH value of the colloid is about 3, and the change is not significant after adding the carrier. Stirring and loading for 60 minutes, a blue-purple slurry was obtained, and after suction filtration, washing and drying in a vacuum oven, a blue-purple powder sample was obtained. Place the solid sample in a quartz tube at 3%% O 2 Oxidation treatment was carried out at 250°C for 4 hours at 250°C (a...

Embodiment 2

[0037] Embodiment 2: The proportion of reducing agent is different: 1wt% Au / TiO with a diameter of about 1.5 nanometers of Au nanoparticles 2 Synthesis.

[0038] The mass concentration is 0.084mg.ml -1 The polyvinyl alcohol was added to a concentration of 1.6 mM HAuCl 4 solution, stirred for 30min to mix well. Weigh 18.0-18.2 mg of 1.25 times the molar equivalent of NaBH 4 Dissolve in 40mL of deionized water, take half of it and pour it into the above-mentioned protected chloroauric acid mixed solution for direct reduction to obtain a purple-brown colloidal solution. Add carrier TiO directly after reducing 3-5mim 2 , the pH value of the colloid was measured to be around 3.2, and there was little change after adding the carrier. Stirring and loading for 60 minutes, a blue-purple slurry was obtained, and after suction filtration, washing and drying in a vacuum oven, a blue-purple powder sample was obtained. Place the solid sample in a quartz tube at 20% O 2 Oxidation trea...

Embodiment 3

[0041] Embodiment 3: The proportion of reducing agent is different: 1wt% Au / TiO with Au nanometer particle diameter of about 3 nanometers 2 Synthesis.

[0042] The mass concentration is 0.084mg.ml -1 The polyvinyl alcohol was added to a concentration of 1.6 mM HAuCl 4solution, stirred for 30min to mix well. Weigh 36.2-36.4 mg of 5 times the molar equivalent of NaBH 4 Dissolve it in 20mL of deionized water, and pour it all at once into the above-mentioned protected chloroauric acid mixed solution for direct reduction to obtain a brown-red colloidal solution. Add carrier TiO directly after reducing 3-5mim 2 , the pH value of the colloid is measured at 5-6, and the change is not significant after adding the carrier. Stirring and loading for 60 minutes, a brown-red slurry was obtained, and after suction filtration, washing and drying in a vacuum oven, a brown-red powder sample was obtained. Place the solid sample in a quartz tube in 10% O 2 Oxidation treatment was carried o...

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Abstract

A synthetic method of simple gold nanoparticle catalysts having a controllable dimension, and applications of the catalysts are disclosed. Aurochloric acid is adopted as a gold source, poly(vinyl alcohol) is adopted as a protective agent, sodium borohydride is adopted as a reductant, and a direct reduction process is adopted to prepare a gold nanoparticle material. Aurochloric acid hydrate is hydrolyzed in water to form free Au<3+>. A series of gold clusters and gold nanoparticles having different dimensions and uniform particle sizes can be obtained through adjusting the concentration of Au<3+> and a mole ratio of the Au<3+> to the reductant. A carrier can be directly loaded with obtained gold colloid through a colloid process. The catalysts can be used for researches for understanding base mechanism of gold nanometer catalysts, and can be applied in simple catalytic reactions. Problems that dimensions are non-uniform and a gold utilization rate is low in a gold nanoparticle preparing process are overcome. Complex gold cluster and gold nanoparticle preparing methods at present are optimized. The cost is reduced. The method and the applications have certain economic value and research value.

Description

[0001] Technical field: [0002] The invention belongs to the field of catalytic material design, and relates to a simple size-controllable gold nano particle catalyst synthesis method. [0003] Background technique: [0004] At present, the research on nano-gold catalysts has a considerable breadth and depth, but the commercialization of nano-gold catalysts still faces great challenges. First of all, due to the limitations of preparation methods, it is difficult to break through the large-scale production of nano-gold catalysts. The impregnation method commonly used in industry is not conducive to the preparation of highly active nano-gold catalysts. However, the precursors of organogold complexes are expensive, unstable, and possibly toxic, which limits their use in large-scale production. Secondly, the preparation of highly active nanocatalysts is affected by many factors, such as: temperature, pH value, reducing agent, protective agent, etc. Finally, nano-gold catalysts ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52C01B32/50
CPCB01J23/52B01J35/006B01J37/16
Inventor 黄家辉邵斌
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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