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Black cerium dioxide nano-material and preparation method thereof

A technology of cerium oxide and nanomaterials, applied in the direction of cerium oxide/cerium hydroxide, nanotechnology, nanotechnology, etc., can solve the problems of organic ligands that are not resistant to high temperature, expensive, high energy consumption, etc., and achieve excellent photothermal The effect of conversion efficiency

Inactive Publication Date: 2020-06-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, further studies have shown that the above-mentioned existing solutions still have the following defects or deficiencies: first, such methods are relatively complex and consume a lot of energy; second, they usually require the use of organic ligands, which are expensive and difficult to achieve mass production. Moreover, these organic ligands are not resistant to high temperature and are likely to cause secondary pollution.

Method used

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  • Black cerium dioxide nano-material and preparation method thereof
  • Black cerium dioxide nano-material and preparation method thereof
  • Black cerium dioxide nano-material and preparation method thereof

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Embodiment approach

[0034] According to a typical implementation of the present invention, an embodiment of the present invention provides a method for preparing a black ceria nanomaterial, comprising:

[0035] S1. Mix and stir the cerium salt solution and the lye to carry out the first reaction to obtain a precipitate; the molar concentration ratio of the cerium salt solution to the lye is 1:100-200;

[0036] Cerium salt solution reacts with alkali such as sodium hydroxide to generate cerium hydroxide;

[0037] If the molar concentration ratio of cerium salt to alkali is too low, black cerium oxide cannot be finally produced, and if the molar concentration ratio is too high, there will be problems of sodium hydroxide dissolution and subsequent cleaning of surface alkali salt is difficult.

[0038] S2. placing the precipitate in liquid nitrogen for low-temperature treatment to obtain blue crystals;

[0039] S3. Thawing and drying the blue crystals to obtain yellow cerium oxide;

[0040] This pr...

Embodiment 1

[0061] Dissolve 1.96g of persimmon nitrate hexahydrate in 40ml of deionized water, 18.1g of NaOH in 30ml of deionized water, add the cerium salt solution dropwise into the sodium hydroxide solution, stir evenly in the beaker at 400rpm for 30min, the mixed solution appears light blue Add the mixed solution dropwise into 500ml liquid nitrogen to obtain a light blue solid, wash it with deionized water after thawing, then centrifuge at 6000rpm, repeat the washing and centrifugation for 5 times, and dry it in an oven at 80°C for 24h to obtain a yellow cerium oxide nano material, denoted as LNCeO 2 100-1, reduced at a temperature of 500 ° C to obtain the desired black ceria nanomaterial product.

Embodiment 2

[0063] Dissolve 1.96g of cerium nitrate hexahydrate in 40ml of deionized water, 27.15g of NaOH in 30ml of deionized water, add the cerium salt solution dropwise into the sodium hydroxide solution, stir evenly in a beaker at 400rpm for 30min, the mixed solution appears light blue Add the mixed solution dropwise into 500ml liquid nitrogen to obtain a light blue solid, wash it with deionized water after thawing, then centrifuge at 6000rpm, repeat the washing and centrifugation for 5 times, and dry it in an oven at 80°C for 24h to obtain a yellow cerium oxide nano material, denoted as LNCeO 2 150-1, reduced at a temperature of 500°C to obtain the desired black ceria nanomaterial product.

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Abstract

The invention particularly relates to a black cerium dioxide nano-material and a preparation method thereof, and belongs to the technical field related to preparation of cerium dioxide nano-materials.The preparation method of the black cerium dioxide nano-material comprises the following steps: mixing a cerium salt solution with an alkali liquor, and stirring to obtain a precipitate, wherein themolar concentration ratio of the cerium salt solution to the alkali liquor is 1:(100-200); adding the precipitate into liquid nitrogen, and carrying out low-temperature treatment to obtain blue crystals; unfreezing and drying the blue crystals to obtain yellow cerium oxide; and carrying out a reduction reaction on the yellow cerium oxide at the temperature of 500-800 DEG C under the hydrogen condition to obtain the black cerium dioxide nano-material which is stable at room temperature. The black cerium dioxide nano-material prepared by the method has excellent photo-thermal conversion efficiency, waste gas catalytic treatment, carbon dioxide catalytic reduction and other application values.

Description

technical field [0001] The invention belongs to the technical field related to the preparation of cerium oxide nanomaterials, and in particular relates to a black cerium oxide nanomaterial and a preparation method thereof. Background technique [0002] Oxygen vacancies on the surface of cerium oxide have a strong function of storing and releasing oxygen. Therefore, as a catalyst with strong oxygen exchange capacity, it is widely used in the treatment of petrochemical and automobile exhaust pollutants. Oxidation reactions can be carried out under mild conditions, such as the C-H bond activation of alkanes, CO oxidation, methane oxidation coupling, etc., but the activity is low at room temperature; the activity is high under high temperature conditions, but it is easy to produce carbon deposition, and the catalyst is sintered at high temperature , and cause a lot of energy consumption and other problems, it is necessary to design and prepare catalytic materials with better cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/235B82Y30/00
CPCB82Y30/00C01P2002/72C01P2004/04C01P2004/64
Inventor 张立麒鲁博文张泽武罗聪李小姗李诗谙支昕宇
Owner HUAZHONG UNIV OF SCI & TECH
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