Morphology controllable nanometer CeO2 preparation method

A nano and morphology technology, applied in the direction of nanotechnology, chemical instruments and methods, sustainable manufacturing/processing, etc., to achieve the effects of simplified production process, strong environmental protection and economic applicability, and reduced agglomeration

Inactive Publication Date: 2013-02-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although my country is rich in cerium resources, the preparation and application research of nano-cerium dioxide is still in the laboratory

Method used

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  • Morphology controllable nanometer CeO2 preparation method
  • Morphology controllable nanometer CeO2 preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) First, take 8.69g of cerium nitrate hexahydrate and 16.81g of citric acid and dissolve them in 100ml of deionized water to prepare cerium nitrate and citric acid solutions;

[0017] 2) Then slowly add the cerium nitrate solution into the citric acid solution under stirring, stir evenly at 65°C, add ammonia water dropwise, adjust the pH value to 2.0, then put it in a water bath and stir at 80°C until the reaction occurs Sol, put the formed sol into a drying oven and dry at 100°C to form a xerogel;

[0018] 3) The above-mentioned xerogel was fired in a muffle furnace from room temperature to 300°C at a heating rate of 3°C / min for 2 hours to obtain light yellow CeO 2 , Grind the roasted product with a mortar, and finally get a light yellow CeO 2 powder.

Embodiment 2

[0020] 1) First, take 8.69g of cerium nitrate hexahydrate and 16.81g of citric acid and dissolve them in 100ml of deionized water to prepare cerium nitrate and citric acid solutions;

[0021] 2) Then slowly add the cerium nitrate solution into the citric acid solution under stirring, stir evenly at 65°C, add ammonia water dropwise, adjust the pH value to 2.3, then put it in a water bath and stir at 80°C until the reaction occurs Sol, put the formed sol into a drying oven and dry at 100°C to form a xerogel;

[0022] 3) The above-mentioned xerogel was fired in a muffle furnace from room temperature to 400°C at a heating rate of 4°C / min for 2 hours to obtain light yellow CeO 2 , Grind the roasted product with a mortar, and finally get a light yellow CeO 2 powder.

Embodiment 3

[0024] 1) First, take 8.69g of cerium nitrate hexahydrate and 16.81g of citric acid and dissolve them in 100ml of deionized water to prepare cerium nitrate and citric acid solutions;

[0025] 2) Then slowly add the cerium nitrate solution into the citric acid solution under stirring, stir evenly at 65°C, add ammonia water dropwise, adjust the pH value to 2.5, then put it in a water bath and stir at 80°C until the reaction occurs Sol, put the formed sol into a drying oven and dry at 100°C to form a xerogel;

[0026] 3) The above-mentioned xerogel was fired in a muffle furnace from room temperature to 500°C at a heating rate of 5°C / min for 2 hours to obtain light yellow CeO 2 , Grind the roasted product with a mortar, and finally get a light yellow CeO 2 powder.

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Abstract

Disclosed is a morphology controllable nanometer CeO2 preparation method. Hexahydrate cerous nitrate and a citric acid are mixed to obtain a mixture, the mixture is stirred in a magnetic force heating stirrer, the potential of hydrogen (pH) of the mixture is adjusted to 2.0 to 2.5 by aqueous ammonia, the mixture is placed in water bath to be reacted and dried in an air-blowing drying oven, then the dried mixture is placed in a muffle furnace to be calcined at different temperatures from 200 DEG C to 700 DEG C to obtain a product, and the calcined product is ground in a agate mortar to obtain a faint yellow CeO2 powder. According to the method, grain growth kinetics and sol-gel method principles are utilized, the different calcination temperatures are controlled in the process of forming the material, so that the material can be synthesized at low temperature, the energy is saved, the agglomeration during material synthesizing is reduced, the production process is simplified, and the average particle diameter of the formed nanometer oxide ceric oxide particle is smaller with the increasing of the calcination temperature.

Description

technical field [0001] The present invention relates to a CeO 2 The preparation method, specifically relates to a nano-CeO with controllable morphology 2 method of preparation. Background technique [0002] Nanoparticles have attracted great attention from scientists all over the world due to their unique optical, acoustic, electrical, magnetic, thermal, catalytic, mechanical, chemical properties and potential application prospects, and have become one of the hot spots in material science research. Ceria and cerium-based nanomaterials are widely used in superconductors, ceramics, three-way catalysts, oxygen sensors, solid oxide fuel cells, ultraviolet absorbers, glass polishing materials, and electrolytes and electrodes of solid oxide fuel cells due to their multifunctional properties. Materials and other high-tech fields have been widely used. Nano ceria is used in various scientific research fields, and the application of nano ceria is on the rise. Although my country ...

Claims

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Application Information

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IPC IPC(8): C01F17/00B82Y40/00
CPCY02P20/10
Inventor 王芬杨彦青周长江
Owner SHAANXI UNIV OF SCI & TECH
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