Process for preparing nanometer cerium dioxide

A nano-ceria, cerium salt technology, applied in chemical instruments and methods, nanotechnology, nanotechnology and other directions, to achieve the effect of reducing cost, large activity and small particle size

Inactive Publication Date: 2008-01-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the nano-CeO prepared by these existing methods 2 The particle size is all relatively la

Method used

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  • Process for preparing nanometer cerium dioxide
  • Process for preparing nanometer cerium dioxide

Examples

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Effect test

Embodiment 1

[0021] Weigh Ce(NO 3 ) 3 ·6H 2 O 8.68g, be made into 0.1mol / L solution of 100ml, and add 1gPEG4000 wherein; Weigh (NH 4 ) 2 CO 3 ·H 2 O 5.13g, made into 150ml of 0.1mol / L solution. The prepared two solutions were preheated at 40°C for 10 min, and then (NH 4 ) 2 CO 3 ·H 2 The O solution was quickly poured into the Ce(NO 3 ) 3 ·6H 2 O mixed solution in a 1L three-neck flask with temperature control, control the pH value of the reaction system to 7-8, and stir the reaction by electric machinery at 800r / min for 10min, and wash the obtained sol twice with deionized water during the vacuum filtration process , the sol after suction filtration is mixed with 20ml n-butanol under strong mechanical stirring to form a suspension, and then the liquid is poured into a three-necked flask of an azeotropic distillation device. When the temperature rises to the water-alcohol azeotropic temperature of 93°C, the The water in the gel is entrained and removed in the form of azeotrop...

Embodiment 2

[0023] Weigh Ce(NO 3 ) 3 ·6H 2 O 8.68g, be made into 0.1mol / L solution of 100ml, and add 1gPEG4000 wherein; Weigh (NH 4 ) 2 CO 3 ·H 2 O 5.13g, made into 150ml of 0.1mol / L solution. At 40°C, the (NH 4 ) 2 CO 3 ·H 2 The O solution was quickly poured into the Ce(NO 3 ) 3 ·6H 2 In the O mixed solution, the pH value of the reaction system was controlled to be 8-9, and the reaction was mechanically stirred at 800rpm for 10 minutes. The obtained precursor sol was washed twice with distilled water during the vacuum filtration process, and the sol after suction filtration was under strong mechanical stirring. Mix with 20ml of isobutanol to form a suspension, then pour the liquid into a three-neck flask of an azeotropic device, heat up to the boiling point of isobutanol above 108°C, take out the gel after reflux for 15 minutes, and put it in a vacuum drying oven to dry at 60°C 3h. The obtained precursor gel powder was calcined in a muffle furnace at 700 °C for 3 hours to ...

Embodiment 3

[0025] Weigh Ce(NO 3 ) 3 ·6H 2 O 8.68g, be made into 0.1mol / L solution of 100ml, and add 1gPEG4000 wherein; Weigh (NH 4 ) 2 CO 3 ·H 2 O 5.13g, made into 150ml of 0.1mol / L solution. At 40°C, the (NH 4 ) 2 CO 3 ·H 2 The O solution was quickly poured into the Ce(NO 3 ) 3 ·6H 2 In the O mixed solution, the pH value of the reaction system was controlled to be 8-9, and the reaction was mechanically stirred at 800rpm for 10 minutes. The obtained precursor sol was washed twice with distilled water during the vacuum filtration process, and the sol after suction filtration was under strong mechanical stirring. Mix with 20ml of n-propanol to form a suspension, pour the liquid into a three-necked flask with an azeotropic device, heat up to the boiling point of isobutanol above 97°C, take out the gel after reflux for 15 minutes, and dry it in a vacuum oven at 60°C for 3 hours . The obtained precursor gel powder was calcined in a muffle furnace at 300 °C for 1 h to obtain ye...

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Abstract

Disclosed is a method for nano-cerium oxide preparation. The azeotropic mechanism will be introduced to the precipitation method; surfactant is added to 0.1-0.5 mol / L cerium salt solution and precipitator is rapidly added for reaction, then the gel produced after the reaction is washed by ionic water and mixed with a certain amount of organic alcohol under rapid mixing; then the mixture is poured into an azeotropic device to be slowly heated above the alcohol boiling point; through refluxing, the gel is taken out and dried to obtain precursor powder; through the baking of the precursor powder, high-purity active CeO2 is obtained. The nano-CeO2 prepared by the present invention is within 5 to 19 nm in grain size, which is smaller and more uniformly, with better dispersibility and greater activity. The organic alcohol used in the azeotropic distillation process is recyclable and is low in cost and can prevent environmental pollution.

Description

technical field [0001] The present invention relates to a kind of cerium oxide (CeO 2 ) preparation method, specifically, relates to a preparation method of nano ceria. Background technique [0002] Rare earth oxide CeO 2 Because of its strong redox ability and oxygen ion conductivity at high temperature, it is widely used in modern high-tech fields such as automobile exhaust purification, oxygen sensor, catalyst, solid oxide fuel cell electrode material, and chemical mechanical polishing abrasive material. Due to the nanosize effect, in practical applications, nano-CeO 2 It can also play the role of increasing selectivity, improving stability and improving catalysis, so the preparation of nano-CeO with fine particles and uniform particle size 2 It is of great significance to study its rare earth compound materials. [0003] Chinese patent CN1215981C discloses a method for preparing nano-cerium dioxide by reverse precipitation method, which uses cerium nitrate, cerium di...

Claims

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Application Information

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IPC IPC(8): C01F17/00B82B3/00
Inventor 宋晓岚曲鹏何希邱冠周杨华明金胜明
Owner CENT SOUTH UNIV
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