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Alumina supported type cerium oxide powder material preparation method

A technology of ceria and powder materials, which is applied in the field of material processing engineering, can solve problems such as toxic liquid waste, poor dispersion effect, complex influence of precursors and solutions, etc., to improve product reliability, reduce production costs, The effect of good industry prospects

Inactive Publication Date: 2015-12-09
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common dispersion methods are: ball milling, impregnation, and sol-gel methods, which are time-consuming and often result in poor dispersion or toxic liquid waste
In 2014, Pournajaf et al. from Islamic Azad University in Iran synthesized Al 2 o 3 -CeO 2 Nanocomposite powder, this method adjusts the size and morphology of the powder by changing the surface activity of sodium lauryl sulfate, cetyltrimethylammonium bromide and polyoxyethylene lauryl ether, but it also causes Time-consuming and polluting the environment
On the other hand, the synthesis of CeO 2 The influence of the precursor and solution of the compound is very complicated, so the repeatability is very poor (CeramicsInternational, 2014, 40 (3), P4933-4937)

Method used

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  • Alumina supported type cerium oxide powder material preparation method
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Experimental program
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Effect test

Embodiment 1

[0024] The invention provides a method for preparing an alumina-supported ceria powder material. The preparation steps are as follows:

[0025] (1) Ce(DPM) 4 As 1g of organic raw material, heated to 250°C in an evaporator;

[0026] (2) 5gAl 2 o 3 Powder (Al 2 o 3 The average particle size of the powder is 100 μm, the purity is not less than 95%) and dried at 80°C for 2 hours, and then the processed Al 2 o 3 The powder is placed in the chemical vapor deposition reaction chamber, vacuumed to 7Pa, preheated at a heating rate of 10°C / min and raised to 500°C;

[0027] (3) feed the mixed gas of oxygen, argon and evaporated raw material in the rotary reactor, the flow of argon gas is 100sccm, the flow of oxygen gas is 10sccm, then adjust the pressure in the reaction chamber, the total pressure is 200Pa, wherein the partial pressure of oxygen is 50Pa. During the coating process, the temperature was 600°C, the reactor speed was 45rpm, and the temperature was kept for 0.5h, so t...

Embodiment 2

[0032]The invention provides a method for preparing an alumina-supported ceria powder material. The preparation steps are as follows:

[0033] (1) Ce(DPM) 4 As organic raw material 3g, heated to 100°C in an evaporator;

[0034] (2) 5gAl 2 o 3 Powder (Al 2 o 3 The average particle size of the powder is 50 μm, and the purity is not less than 95%), which is pretreated by drying at 80°C for 2 hours, and then the processed Al 2 o 3 The powder is placed in the chemical vapor deposition reaction chamber, evacuated to 5Pa, and the temperature is raised to 600°C at a preheating rate of 2°C / min;

[0035] (3) feed the mixed gas of oxygen, argon and evaporated raw material in the rotary reactor, the flow of argon gas is 100sccm, the flow of oxygen gas is 10sccm, then adjust the pressure in the reaction chamber, the total pressure is 500Pa, wherein the partial pressure of oxygen is 100Pa. During the coating process, the temperature was 600 ° C, the reactor speed was 45 rpm, and the...

Embodiment 3

[0040] The invention provides a method for preparing an alumina-supported ceria powder material. The preparation steps are as follows:

[0041] (1) Ce(DPM) 4 As 10g of organic raw material, heated to 100°C in an evaporator;

[0042] (2) 5gAl 2 o 3 Powder (Al 2 o 3 The average particle size of the powder is 10 μm, and the purity is not less than 95%), which is dried at 80°C for 2 hours, passed through a 100-mesh sieve for 3 pretreatments, and then the processed Al 2 o 3 The powder is placed in the chemical vapor deposition reaction chamber, evacuated to 5Pa, preheated and heated at a rate of 5°C / min to 600°C;

[0043] (3) feed the mixed gas of oxygen, argon and evaporated raw material in the rotary reactor, the flow of argon gas is 100sccm, the flow of oxygen gas is 10sccm, then adjust the pressure in the reaction chamber, the total pressure is 1000Pa, wherein the partial pressure of oxygen is 300Pa. During the coating process, the temperature was 800°C, the reactor spe...

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Abstract

The invention discloses an alumina supported type cerium oxide powder material preparation method which comprises: chemical vapor deposition method is adopted, a cerium metal organic precursor is effectively decomposed in an oxygen atmosphere and in a temperature range of 500-700 DEG C, and CeO<2> nano particles are generated and uniformly dispersed on the support alumina. Experiment parameters of reaction of organic materials and oxygen are changed to accelerate the CeO<2> precursor decomposition, powder size and microstructure are controlled, then cerium oxide nanoparticles are prepared and uniformly dispersed, and toxic waste liquid is prevented from being created. The alumina supported type cerium oxide powder material of the invention has a simple preparation method and short preparation cycle; the produced cerium oxide nanoparticle are uniformly dispersed and widely used as catalytic materials and functional materials in a plurality of fields.

Description

technical field [0001] The invention belongs to the field of material processing engineering, and in particular relates to a method for preparing an alumina-supported ceria powder material. Background technique [0002] Cerium oxide (CeO 2 ) as a new type of functional material with excellent performance has played a key role in emerging technologies, environmental and energy issues, such as the removal of nitrogen oxides in automobile exhaust, using its high oxygen vacancy mobility and ion conductivity to Prepare electrodes for solid oxide fuel cells, use its unique electronic structure to absorb ultraviolet rays in the cosmetics industry and glass manufacturing industry, make light-collecting devices and optical displays, etc. Ce 3+ / C 4+ The electromotive force between the electrodes is low, while the CeO 2 The material is a semi-open fluorite crystal structure, so CeO 2 On the premise of maintaining the stability of its crystal structure, it will release O when it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10
CPCB01J21/04B01J23/10B01J35/023B01J37/0223B01J37/0238C04B35/62815C23C16/40B01J35/0006B01J35/026
Inventor 张建峰张欣曹慧杨郭文敏李改叶吴玉萍
Owner HOHAI UNIV
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