Method for preparing ZrO2-CeO2/CNTs composite nanotube by hydrothermal method

A technology of zro2-ceo2 and nanotubes, which is applied in the direction of nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve the problems of carbon nanotube coating structure damage, specific surface area decrease, and organic solvent toxicity, etc., to achieve light agglomeration, The shell is dense and uniform, and the process is simple

Inactive Publication Date: 2010-07-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They have their own advantages and disadvantages: the products prepared by the sol-gel method have good uniformity, small grain radius, and large specific surface area. The disadvantages are that the organic solvent is toxic and requires high-temperature calcination; The later high-temperature calcination will easily cause the decomposition of carbon nanotubes, which will destroy the coating structure of carbon nanotubes, agglomerate particles, and reduce the specific surface area.

Method used

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  • Method for preparing ZrO2-CeO2/CNTs composite nanotube by hydrothermal method
  • Method for preparing ZrO2-CeO2/CNTs composite nanotube by hydrothermal method
  • Method for preparing ZrO2-CeO2/CNTs composite nanotube by hydrothermal method

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example 1

[0030] Weigh 0.1 g of carbon nanotubes and 0.05 g of surfactant (hexadecyltrimethylammonium bromide CTBA), allow them to mix uniformly, add water, and ultrasonically disperse for 15 minutes to obtain a water dispersion system of carbon nanotubes / CTBA . Then take by weighing nanoscale zirconium oxychloride 1.5g, nanoscale cerium nitrate 3.0g, join in the water dispersion system of carbon nanotube / CTBA, precipitate with ammonia water (pH value is 9.5), the precursor that obtains carries out hydrothermal reaction, The hydrothermal temperature was kept at 140°C for 10 hours, and the obtained product was a cerium-zirconium composite nanotube with a crystallinity of 81% and a specific surface area of ​​85m 2 / g.

example 2

[0032] Weigh 0.1 g of carbon nanotubes and 0.05 g of surfactant (hexadecyltrimethylammonium bromide CTBA), allow them to mix uniformly, add water, and ultrasonically disperse for 20 minutes to obtain a water dispersion system of carbon nanotubes / CTBA . Then take by weighing nanoscale zirconium oxychloride 1.5g, nanoscale cerium nitrate 3.0g, join in the water dispersion system of carbon nanotube / CTBA, precipitate with ammonia water (pH value is 9.5), the precursor that obtains carries out hydrothermal reaction, The hydrothermal temperature is 180°C for 14 hours, and the obtained product is a cerium-zirconium composite nanotube with a crystallinity of 81% and a specific surface area of ​​89m 2 / g.

example 3

[0034] Weigh 0.1 g of carbon nanotubes and 0.05 g of surfactant (hexadecyltrimethylammonium bromide CTBA), allow them to mix uniformly, add water, and ultrasonically disperse for 30 minutes to obtain a water dispersion system of carbon nanotubes / CTBA . Then take by weighing nano-scale zirconium oxychloride 2g, nano-scale cerium nitrate 2.5g, join in the water dispersion system of carbon nanotube / CTBA, precipitate with ammonia water (pH value is 9.5), the precursor that obtains carries out hydrothermal reaction, water The heat temperature is 220°C, and the temperature is constant for 4 hours. The obtained product is a cerium-zirconium composite nanotube with a crystallinity of 78% and a specific surface area of ​​97m 2 / g.

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Abstract

The invention discloses a method for preparing a ZrO2-CeO2/CNTs composite nanotube by a hydrothermal method, which is a method for preparing a composite carbon nano tube based on nanoscale cerium oxide, nanoscale zirconia and a carbon nano tube. The preparation method comprises the steps of: sequentially adding the carbon nano tube, a surface active agent, zirconium oxychloride, cerous nitrate and deionized water which serve as raw materials according to stoichiometric ratio; performing ultrasonic dispersion to uniformly mix the raw materials; dripping ammonia water into the mixed raw materials until the pH value is 9.5; and performing hydro-thermal treatment to prepare a product, wherein the tube diameter of the prepared ZrO2-CeO2/CNTs composite nanotube is between 50 and 80 nanometers, and a specific surface area reaches 70-150 m<2>/g; and the ZrO2-CeO2/CNTs composite nanotube exists in the form of complete solid solution of a square/cubic system, the crystallinity reaches over 75 percent, and the ZrO2-CeO2/CNTs composite nanotube is uniform in loading and has no agglomeration phenomenon. The method has the advantages of simple process, no need of high-temperature calcination, low energy consumption and the like.

Description

technical field [0001] The invention relates to a preparation method of nano-scale cerium-zirconium composite oxide nanotubes, and the solid solution is mainly used in catalysts and fuel cells. The present invention specifically relates to a kind of hydrothermal method to prepare ZrO 2 -CeO 2 / CNTs composite nanotube method. Background technique [0002] The main cause of air pollution in today's cities, it seriously affects people's health and the growth of animals and plants, so it is very important to study catalysts and additives with excellent performance. Nano-scale cerium-zirconium oxide solid solution is a good catalyst additive for automobile exhaust purification. Due to its addition, it not only reduces the amount of precious metals used in the catalyst, but also increases its oxygen storage capacity and mechanical strength, making thermal stability and Catalytic activity is improved. [0003] Carbon nanotubes have a hollow tubular structure, a nanoscale diamet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00B01J23/10B01J37/10
Inventor 郑育英黄慧民刘德飞余林孙明
Owner GUANGDONG UNIV OF TECH
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