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Process for synthesizing nano cerium oxide crystal material

A nano-cerium oxide, synthesis method technology, applied in chemical instruments and methods, rare earth metal compounds, inorganic chemistry and other directions, can solve the problems of difficult material particle size, complex equipment requirements, agglomeration, etc., to hinder crystal grain agglomeration and simple preparation process. Effect

Inactive Publication Date: 2007-04-25
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the molten salt method, these methods have the disadvantages of high reagent cost (such as microemulsion method), complicated equipment requirements (such as spray pyrolysis method) or serious agglomeration (such as precipitation method), and the particle size of the obtained material is not easy to control; The method can obtain materials with uniform composition, but the output is small, and it is difficult to implement in industry

Method used

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  • Process for synthesizing nano cerium oxide crystal material
  • Process for synthesizing nano cerium oxide crystal material
  • Process for synthesizing nano cerium oxide crystal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take Ce(NO 3 ) 3 ·6H 2 O and K 2 C 2 O 4 ·H 2 O is the raw material, and the liquid phase is mixed and reacted to obtain Ce 2 (C 2 O 4 ) 3 Precipitate, dry in an oven at 80~90℃ for 12h; press Ce: KNO 3 Add quantitative KNO to the precipitate at a molar ratio of 1:3 3 , Fully grind and mix uniformly, heat up to 500°C at a speed of 5°C / min, roast at a constant temperature for 3 hours, then cool naturally with the furnace, roast at different temperatures for 3 hours, wash and filter thoroughly with deionized water, and fully dry at 130°C, Get nano CeO with a particle size of about 10nm 2 Crystal.

Embodiment 2

[0023] Take Ce(NO 3 ) 3 ·6H 2 O and K 2 C 2 O 3 ·H 2 O is the raw material, and the liquid phase is mixed and reacted to obtain Ce 2 (C 2 O 4 ) 3 Precipitate, dry in an oven at 120°C for 6 hours; press Ce: KNO 3 Add quantitative KNO to the precipitate at a molar ratio of 1:3 3 , Fully grind and mix uniformly, heat up to 600°C at a rate of 10°C / min, roast at a constant temperature for 3 hours, then cool down at a rate of 20°C / min, wash and filter thoroughly with deionized water and ethanol, and fully dry at 200°C to obtain granules Nano CeO with a diameter of about 20nm 2 Crystal.

Embodiment 3

[0025] Ce(NO 3 ) 3 ·6H 2 O and K 2 C 2 O 4 ·H 2 O solution is mixed, and Ce is obtained by reaction 2 (C 2 O 4 ) 3 Precipitate, dry it in an oven at 150℃ for 5h; press Ce: KNO 3 Add quantitative KNO to the precipitate at a molar ratio of 1:3 3 , Fully grind and mix uniformly, heat up to 700°C at a rate of 25°C / min, roast at a constant temperature for 3 hours, then cool down at a rate of 40°C / min, fully wash and filter with deionized water and acetonitrile, and fully dry at 60-80°C, Get nano CeO with a particle size of about 50nm 2 Crystal.

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Abstract

A process for synthesizing cerium oxide nano-crystals includes such steps as proportionally mixing a fused salt with the compound easy to decompose for releasing Ce, heating to the temp which is 950 deg. C higher than the smelting point of said fused salt, constant-temp calcining, cooling, washing for removing residual fused salt, and baking at 50-300 deg. C.

Description

Invention field [0001] The invention relates to a method for preparing nano materials, in particular to a method for synthesizing nano cerium oxide crystal materials, and belongs to the field of inorganic material synthesis technology or catalyst synthesis technology. Background technique [0002] Cerium oxide has unique price change and oxygen storage properties, and can be widely used in automobile exhaust catalysts, fuel cells, luminescent materials, ultraviolet absorbing materials, electronic ceramics, polishing powders, etc. [0003] The particle size and surface properties of cerium oxide have a huge impact on its performance. Nano cerium oxide as a catalyst promoter can effectively increase the strength of the support, improve the stability of the catalyst, and have obvious oxygen storage performance; when cerium oxide is used in the polishing field, the smaller the particle size, the higher the polishing fineness. Therefore, the development of nano-cerium oxide crystals h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00
Inventor 邱新平王健武增华朱文涛孙杰白玉霞邓小芝李金峰
Owner TSINGHUA UNIV