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Preparation method of precious metal/graphene nanocomposite

A technology of nanocomposite materials and precious metals, applied in the field of preparation of carbon-based nanocomposite materials, can solve unsatisfactory problems and achieve the effects of simple implementation, uniform and controllable particle size, and easy industrial preparation

Active Publication Date: 2017-01-11
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prepared composite metal nanoparticles do not penetrate into the graphene sheet, but are deposited on the surface of the graphene coating, which is not ideal.

Method used

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  • Preparation method of precious metal/graphene nanocomposite
  • Preparation method of precious metal/graphene nanocomposite
  • Preparation method of precious metal/graphene nanocomposite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 0.4258 g K 2 PtCl 4 Dissolved in a small amount of water, added to 400 ml of graphene oxide water dispersion with a concentration of 0.5 g / L, then added 0.1346 g of ammonium nitrate and 0.3435 g of glycine, stirred evenly and ultrasonicated for 30 minutes to obtain a uniform dispersion, heated and concentrated When it becomes thick, put it into a muffle furnace at 500°C to ignite. After the combustion is complete, cool it to room temperature, and wash the product with deionized water and ethanol until the conductivity of the washing liquid is lower than 10 μs / cm 2 After drying, the platinum / graphene nanocomposite material is obtained.

Embodiment 2

[0024] Weigh 0.3709 g NaAuCl 4 Dissolved in a small amount of water, added to 400 ml of graphene oxide water dispersion with a concentration of 0.5 g / L, then added 0.1346 g of ammonium nitrate and 0.2748 g of urea, stirred evenly and ultrasonicated for 30 minutes to obtain a uniform dispersion, heated and concentrated When it becomes thick, put it into a muffle furnace at 500°C to ignite. After the combustion is complete, cool it to room temperature, and wash the product with deionized water and ethanol until the conductivity of the washing liquid is lower than 10 μs / cm 2 After drying, the gold / graphene nanocomposite material is obtained.

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Abstract

The invention discloses a preparation method of a precious metal / graphene nanocomposite. The method comprises the following steps that 1, according to the loading capacity of precious metal on graphene and the preparation quantity of target products, a corresponding quantity of precious metal soluble compounds are weighed and dissolved in a small amount of water, and the mixture is added into a corresponding volume of graphene oxide aqueous dispersion liquid with the concentration of 0.5-5 g / L; 2, a proper amount of organic fuel and ammonium nitrate are added into the dispersion liquid in step 1, and the mixture is stirred and subjected to ultrasound treatment for 15-90 minutes; 3, the mixed dispersion liquid in step 2 is heated and concentrated to be thick and then placed in a heating furnace at the temperature of 300-900 DEG C for ignition, and after combustion is completed, the product is cooled to room temperature, washed and dried. The preparation method is short in synthesis time and easy to implement, a poisonous and harmful reducing agent or stabilizing agent does not need to be added, the particle sizes of platinum nano-particles are uniform and controllable, the platinum nano-particles are uniform in dispersity on graphene, and the preparation method is a new method which is fast and efficient and makes industrial preparation of the platinum / graphene nanocomposite easy.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and relates to a preparation method for carbon-based nanocomposite materials. [0002] technical background [0003] Precious metal catalysts have the characteristics of high catalytic activity, strong selectivity, convenient catalyst production, less usage, repeated regeneration and activation, and long service life. They are mainly used for ammonia oxidation, reforming of petroleum hydrocarbons, oxidation of unsaturated compounds and hydrogenation , removal of carbon monoxide and nitrogen oxides in gas, etc., is a catalyst often used in chemical, petroleum and chemical reaction processes. Compared with bulk noble metal catalysts, noble metal nanocatalysts have higher catalytic activity, less dosage and higher selectivity. However, noble metal nanocatalysts are unstable due to small particles and large surface energy, and are easy to agglomerate, so that most of the noble metal partic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/52B82Y30/00
CPCB01J23/42B01J23/52B82Y30/00
Inventor 陈伟凡方晓辰卓明鹏周文威郭兰玉霍婷婷
Owner NANCHANG UNIV
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