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A method for synthesizing uniform spherical nano-cerium oxide material at low temperature

A nano-cerium oxide, spherical technology, applied in the direction of cerium oxide/cerium hydroxide, lanthanide oxides/hydroxides, rare earth metal oxides/hydroxides, etc., can solve the problem of uneven particle size of products, Achieve uniform particle size and good dispersion

Active Publication Date: 2022-04-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention overcomes the disadvantages of high temperature, long time reaction and non-uniform product particle size in the prior art, and provides a preparation method of highly dispersed uniform spherical cerium oxide with mild conditions, simple requirements and low cost

Method used

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  • A method for synthesizing uniform spherical nano-cerium oxide material at low temperature
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  • A method for synthesizing uniform spherical nano-cerium oxide material at low temperature

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Embodiment 1

[0021] (1) Accurately weigh 2.17 g Ce(NO3)•6H2O, 3.60 g urea, and 1.00 g PVP-K30, respectively add deionized water and stir to dissolve, mix the solutions and stir for 20 minutes;

[0022] (2) Transfer the mixed solution into a polytetrafluoroethylene-lined stainless steel autoclave, raise the temperature to 100 °C, and react for 9 hours to obtain a white precipitate;

[0023] (3) After natural cooling, centrifuge the white precipitate, wash it alternately with deionized water and absolute ethanol several times, and dry it at 80 °C;

[0024] (4) The dried product was calcined at 450 °C for 4 hours to obtain a light yellow solid powder.

Embodiment 2

[0026] (1) Accurately weigh 2.17g Ce(NO3)•6H2O, 3.60g urea, and 1.00g PVP-K30, add deionized water and stir to dissolve, mix the solutions and stir for 20 minutes;

[0027] (2) Transfer the mixed solution into a polytetrafluoroethylene-lined stainless steel autoclave, heat up to 100 °C, and react for 10 hours to obtain a white precipitate;

[0028] (3) After natural cooling, centrifuge the white precipitate, wash it alternately with deionized water and absolute ethanol several times, and dry it at 80 °C;

[0029] (4) The dried product was calcined at 450 °C for 4 hours to obtain a light yellow solid powder.

Embodiment 3

[0031] (1) Accurately weigh 2.17 g Ce(NO3)•6H2O, 3.60 g urea, and 0.80 g PVP-K30, respectively add deionized water and stir to dissolve, mix the solutions and stir for 20 minutes;

[0032] (2) Transfer the mixed solution into a polytetrafluoroethylene-lined stainless steel autoclave, heat up to 100 °C, and react for 10 hours to obtain a white precipitate;

[0033] (3) After natural cooling, centrifuge the white precipitate, wash it alternately with deionized water and absolute ethanol several times, and dry it at 80 °C;

[0034] (4) The dried product was calcined at 450 °C for 4 hours to obtain a light yellow solid powder.

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Abstract

The invention specifically relates to a method for preparing a uniform spherical cerium oxide material, which belongs to the technical field related to the preparation of inorganic nanometer materials. The invention adopts a low-temperature hydrothermal method, dissolves a certain amount of cerium nitrate hexahydrate, urea, and polyvinylpyrrolidone-K30 in deionized water at room temperature, mixes and stirs, and then transfers the obtained solution to a stainless steel autoclave for reaction. The autoclave is maintained at 80-120°C for 6-12h. After naturally cooling to room temperature, spherical nano ceria with uniform particle size can be obtained through centrifugation, washing and calcination. The nano-spherical ceria is synthesized under mild temperature conditions, easy to operate, and easy to control. The average spherical diameter is about 180 nm and the size is uniform. It can be applied to many aspects such as VOCs catalytic degradation, automobile exhaust purification, and ultraviolet light shielding.

Description

technical field [0001] The invention specifically relates to a method for synthesizing a uniform spherical nano-cerium oxide material at low temperature, and belongs to the technical field related to the preparation of inorganic nano-materials. Background technique [0002] The characteristics of inorganic nanomaterials are closely related to their morphology, so shape-selective synthesis has important scientific and technical significance. In recent years, cerium oxide materials with various shapes such as rods, cubes, octahedrons, spheres, and hollow spheres have been synthesized by different methods, among which the spherical shape is superior in terms of fluidity, dense packing, and friction resistance. Spherical cerium oxides with different shapes have been synthesized in various ways: Chen et al. Using Ce(OH)CO3 precursor to synthesize CeO2 nanospheres, the particle size of the obtained product is about 500nm, the size is not uniform, the particle size is too large an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/235C01F17/10
CPCC01F17/235C01F17/10C01P2004/03C01P2004/32C01P2002/72C01P2004/62C01P2006/17
Inventor 唐文翔曹艺嘉张驰唐盛伟欧阳先
Owner SICHUAN UNIV
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