Spherical cerium dioxide

A ceria, spherical technology, applied in the field of micro-nano material synthesis, can solve the problems of long reaction time, high temperature specific surface drop, poor crystallinity, etc. Easy to use effect

Active Publication Date: 2016-09-21
广州市威格林环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The products synthesized by the precipitation method and the sol-gel method have many amorphous shapes, poor crystallinity, and a serious decrease in the specific surface area at high temperature. The gas phase diffusion method has a long reaction time and low yield; while the ball milling method usually only physically mixes various substances. poor performance overall

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of spherical cerium oxide is prepared, which has the following steps:

[0044] (1) Weigh CeCl 3 ·7H 2 O was dissolved in deionized water and ethylene glycol, stirred until it was completely dissolved, then polyvinylpyrrolidone (PVP, molecular weight M=58000) was added, and stirred for about 1 hour to obtain a transparent and clear solution, which was obtained by adding glacial acetic acid and stirred for about 0.5 hours to obtain clear transparent liquid;

[0045] (2) Transfer the transparent and clear mixed solution into a 100ml polytetrafluoroethylene lining, put it into a stainless steel reaction kettle, and react at 180°C for 1h;

[0046] (3) After the reactor was cooled to room temperature, the product was centrifuged at a speed of 10000r / min for 5min to obtain a precipitate, which was washed alternately with deionized water and ethanol for 3 times, and then dried at 80°C for 12h to obtain ceria.

[0047] Test preparation:

[0048] (1) BET specific surfa...

Embodiment 2

[0060] A kind of spherical cerium oxide is prepared, which has the following steps:

[0061] (1) Weigh CeCl 3 ·7H 2 Dissolve O in deionized water, stir until completely dissolved, then add polyvinylpyrrolidone (PVP, molecular weight M = 58000), stir for about 1 hour to obtain a transparent and clear solution, add glacial acetic acid, and finally add urea, stir for about 0.5 hours to obtain clarification transparent liquid;

[0062] (2) Transfer the transparent and clear mixed solution into a 100ml polytetrafluoroethylene lining, put it into a stainless steel reaction kettle, and react at 180°C for 1h;

[0063] (3) After the reactor was cooled to room temperature, the product was centrifuged at a speed of 10000r / min for 5min to obtain a precipitate, which was washed alternately with deionized water and ethanol for 3 times, and then dried at 80°C for 12h to obtain ceria.

[0064] Test preparation:

[0065] (1) BET specific surface area test: Dry the cerium oxide prepared in ...

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Abstract

The invention discloses a spherical cerium dioxide. The average particle size of spherical cerium dioxide is 50 nm-300 nm, and the specific surface area after roasting at 1000 DEG C is 1.5-20 m<2> / g, preferably, the specific surface area after roasting at 350 DEG C is 102-153 m<2> / g, and the specific surface area after roasting at 550 DEG C is 80-120 m<2> / g. The preparation method of the spherical cerium dioxide disclosed in the invention has short reaction time and simple operation, and is easy to control. Moreover, the prepared cerium dioxide is spherical and has regular shape, good degree of crystallization, high heat stability, and big specific surface area.

Description

technical field [0001] The invention belongs to the field of synthesis of micro-nano materials, and in particular relates to spherical ceria. Background technique [0002] Rare earth elements have a unique 4f electron shell, and the different movement modes of 4f electrons make them have optical, magnetic, electrical, physical and chemical properties different from other elements. Cerium oxide is one of the rare earth oxides, which is abundant in our country and widely used. For example, it is an important part of oxygen sensor, humidity sensor, solid fuel cell, and is also a good UV adsorbent, ceramic material, polishing material, etc. In addition, because it has two valence states of +3 and +4, and with the change of the external oxygen partial pressure, the valence state of cerium is easy to convert between the two, so it has a special ability to store and release oxygen; in addition, it has a large specific surface It is suitable for use as a carrier or additive for he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
CPCC01F17/206C01P2002/72C01P2004/03C01P2004/62C01P2004/64C01P2006/12
Inventor 赵向云杨润农余林范群萧剑鸣杨晓波
Owner 广州市威格林环保科技有限公司
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