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Method for preparing nano CeO2 power by ultrasonic atomization process

An ultrasonic atomization and nanotechnology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problems of complex preparation process, poor monodispersity, high preparation cost, etc., achieve good repeatability, less pollution, Effects with few types

Inactive Publication Date: 2009-02-25
JIANGSU POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the common problems in the preparation of nano-powders by the traditional liquid phase method are serious particle agglomeration, uneven particle size distribution, and poor monodispersity, which seriously affect the performance of the powder.
Mei Yan et al. used the water / oil microemulsion system composed of hexadecyltrimethylammonium bromide + n-butanol / cyclohexane / water solution to realize the micro-region reaction, and prepared monodisperse nano-CeO 2 Particles, but the preparation process is too complicated and the preparation cost is high; Zhang Jiaqi et al. made TiO with better performance by ultrasonically atomizing the reaction solution and then pyrolyzing it. 2 Powder
At present, no nano-CeO nanoparticle has been found to realize the micro-region reaction by ultrasonic atomization. 2 Related news about powder

Method used

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  • Method for preparing nano CeO2 power by ultrasonic atomization process
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  • Method for preparing nano CeO2 power by ultrasonic atomization process

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Embodiment 1

[0017] Preparation of Ce(NO 3 ) 3 200ml each with ammonium bicarbonate solution, where [Ce 3+ ]=0.4mol / l, the concentration molar ratio of ammonium bicarbonate and cerium nitrate is 4:1, place the two reaction solutions in an ultrasonic atomization device for atomization, and pass the atomized reaction solution into the reactor for reaction. And the generated suspended sediment is introduced into a collector for collection to obtain a suspension, and then the precipitate is obtained by centrifugation. The precipitate was washed three times with distilled water and once with absolute ethanol, dried in a blast drying oven, and then calcined at 300°C for 2 hours to obtain nano-CeO 2 Powder.

[0018] The CeO that the processing parameter of embodiment 1 makes 2 The TEM photos of the powder samples are as follows figure 1 As shown, it can be seen that the prepared CeO 2 The particle size distribution of the powder is uniform and nearly spherical, the particle size is between ...

Embodiment 2

[0020] Change the solution parameter preparation [Ce 3+ ] is 0.1mol / l, and the molar ratio of ammonium bicarbonate to cerium nitrate is 20:1. Place the two reaction solutions in an ultrasonic atomization device for atomization respectively, pass the atomized reaction solution into the reactor for reaction, and introduce the generated suspended sediment into the collector to obtain the suspension, and then The precipitate was obtained by centrifugation. The precipitate was washed three times with distilled water and once with absolute ethanol, dried in a blast drying oven, and then calcined at 300°C for 2 hours to obtain nano-CeO 2 Powder.

[0021] The CeO that the processing parameter of embodiment 2 makes 2 The TEM photos of the powder samples are as follows figure 2 shown.

Embodiment 3

[0023] Using sodium hydroxide as a precipitating agent, changing the solution parameters [Ce 3+ ] is 0.4mol / l, and the molar ratio of sodium hydroxide to cerium nitrate is 3:1. Place the two reaction solutions in an ultrasonic atomization device for atomization respectively, pass the atomized reaction solution into the reactor for reaction, and introduce the generated suspended sediment into the collector to obtain the suspension, and then The precipitate was obtained by centrifugation. The precipitate was washed three times with distilled water and once with absolute ethanol, dried in a blast drying oven, and then calcined at 300°C for 2 hours to obtain nano-CeO 2 Powder.

[0024] The CeO that the processing parameter of embodiment 3 makes 2 The TEM photos of the powder samples are as follows image 3 shown.

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Abstract

A method for preparing nano CeO2 powder by an ultrasonic atomization process relates to the preparation field of nano powder, and is characterized in that: a certain amount of cerium salt and a precipitant are respectively dissolved into distilled water to prepare a reaction solution with a certain concentration, wherein, the concentration range of Ce<3+> in the reaction solution is 0.1-1mol / L, and the concentration mol ratio of the precipitant to the cerium salt is 2:1-20: 1. The two reaction solutions are ultrasonically atomized respectively and introduced into a reactor for reaction after being mixed, and the suspended precipitate generated by the reaction is collected, washed, dried and calcined at the temperature of 300-800 DEG C for 0.5-3h to obtain the faint yellow nano CeO2 powder. The method has the advantages that the nano CeO2 powder with good monodispersion is prepared by a simple chemical process without complicated devices, a few cheap chemical raw materials with little pollution is needed, repeatability is good, and the shape of the particles is subsphaeroidal and the particle size thereof is nano grade.

Description

technical field [0001] The invention relates to the field of nano-powder preparation, in particular to a method for preparing a near-spherical nano-oxide powder with good monodispersity and uniform particle size distribution by an ultrasonic atomization method. Background technique [0002] CeO 2 As a typical rare earth oxide has many functional properties, it is widely used in electronic ceramics, radiation-resistant glass, luminescent materials, catalytic materials, chemical mechanical polishing (CMP) abrasives, high temperature oxygen sensitive materials, pH sensing materials, Intermediate materials for fuel cells, membrane reactor materials for electrochemical cells, electrode materials for intermediate temperature solid oxide fuel cells (SOFC), etc., have great development potential in modern high-tech fields. The preparation of ultrafine powder by liquid phase method has the advantages of mild reaction conditions, easy control, uniform composition and high purity of t...

Claims

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Application Information

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IPC IPC(8): C01F17/00
Inventor 陈志刚陈扬刘强赵晓兵李霞章付猛
Owner JIANGSU POLYTECHNIC UNIVERSITY