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Methods for preparing nanometer cerium dioxide having specific crystal faces

A nano-ceria, nano-ceria technology, applied in chemical instruments and methods, nanotechnology, nanotechnology and other directions, can solve the problems of large size of nano-ceria, low specific surface area, and inability to give full play to the advantages of ceria , to achieve the effect of cost saving, large specific surface area and more catalytic active sites

Inactive Publication Date: 2018-02-02
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the size of the nano-ceria prepared by it is relatively large, generally between 100nm and 500nm. Such a large size makes the specific surface area of ​​ceria low, and cannot give full play to the advantages of the specific crystal plane of ceria.

Method used

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  • Methods for preparing nanometer cerium dioxide having specific crystal faces
  • Methods for preparing nanometer cerium dioxide having specific crystal faces
  • Methods for preparing nanometer cerium dioxide having specific crystal faces

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of nano-ceria with {111} crystal plane orientation.

[0035] (1) 1.302g of cerium nitrate hexahydrate was dissolved in 10mL of deionized water, in addition, 0.36g of NaOH was dissolved in 20mL of deionized water, and magnetically stirred to form two uniform solutions;

[0036] (2) Under the condition of magnetic stirring, the NaOH solution was added dropwise to the cerium nitrate hexahydrate solution, gradually a precipitate was formed, and finally a purple suspension was formed, and the stirring was continued for 30 minutes;

[0037] (3) Transfer the suspension in 2) to a 50mL polytetrafluoroethylene liner, put it into a reaction kettle, put the reaction kettle into a blast drying oven controlled by resistance, keep it warm at 180°C for 24h, and then put The reactor was naturally cooled to room temperature.

[0038] (4) The product obtained in 3) was centrifuged three times with deionized water and ethanol, and then dried in the air at 60°C for 24 hours to...

Embodiment 2

[0040] Preparation of nano-ceria with {110} and {100} crystal plane orientations.

[0041] (1) 1.302g of cerium nitrate hexahydrate was dissolved in 10mL of deionized water, 3.6g of NaOH was dissolved in 20mL of deionized water, and magnetically stirred to form two uniform solutions;

[0042] (2) Under the condition of magnetic stirring, the NaOH solution was added dropwise to the cerium nitrate hexahydrate solution, gradually a precipitate was formed, and finally a purple suspension was formed, and the stirring was continued for 30 minutes;

[0043](3) Transfer the suspension in 2) to a 50mL polytetrafluoroethylene liner, put it into a reaction kettle, put the reaction kettle into a blast drying oven controlled by resistance, keep it warm at 100°C for 24h, and then put The reactor was naturally cooled to room temperature.

[0044] (4) The product obtained in 3) was centrifuged three times with deionized water and ethanol, and then dried in the air at 60°C for 24 hours to obt...

Embodiment 3

[0046] Preparation of nano-ceria with {100} crystal plane orientation.

[0047] (1) 1.302g of cerium nitrate hexahydrate was dissolved in 10mL of deionized water, 0.72g of NaOH was dissolved in 20mL of deionized water, and magnetically stirred to form two uniform solutions;

[0048] (2) Under the condition of magnetic stirring, the NaOH solution is added dropwise to the cerium nitrate hexahydrate solution, gradually producing a precipitate, finally forming a purple suspension, and continuing to stir for 30 minutes;

[0049] (3) Transfer the suspension in 2) to a 50mL polytetrafluoroethylene liner, put it into a reaction kettle, then put the reaction kettle into a resistance-controlled blast drying oven, keep it warm at 180°C for 24h, and then The reaction kettle was naturally cooled to room temperature.

[0050] (4) The product obtained in 3) was centrifuged three times with deionized water and ethanol, and then dried at 60° C. in the air for 24 hours to obtain a white solid,...

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Abstract

The invention relates to three methods for preparing nanometer cerium dioxide having specific crystal faces. The method for preparing nanometer cerium dioxide having a {111} crystal face orientation comprises the following steps: adding a NaOH solution to a cerium nitrate solution under a stirring condition to adjust the pH value to 5-7 in order to form a purple suspension; carrying out a hydrothermal reaction on the suspension in a blast drying oven at 160-200 DEG C; and cleaning and drying the resulting product to obtain a white or light yellow solid, and grinding the solid to obtain nanometer cerium dioxide powder. The method for preparing nanometer cerium dioxide having {110} and {100} crystal face orientations is different from the above method, and is characterized in that the pH value is adjusted to 10 or more, and the hydrothermal reaction is carried out at 90-110 DEG C. The method for preparing nanometer cerium dioxide having a {100} crystal face orientation is different fromthe above first method, and is characterized in that the pH value is adjusted to 10-13.

Description

technical field [0001] The invention belongs to the technical field of synthesis of rare earth oxide nanomaterials, and in particular relates to a preparation method of nano cerium dioxide capable of obtaining a specific crystal plane orientation and a size range of about 20 nm. Background technique [0002] Rare earth elements are widely used in industry and are known as "industrial gold". Cerium (Ce) is the most abundant rare earth element. The atomic number of Ce is 58 and has a special electronic structure (4f 1 5d 1 6s 2 ), its 4f and 5d electron orbitals are partially filled, and each has only one electron, so the Ce atom has two ion valence states Ce 4+ and Ce 3+ . First of all, Ce atoms can lose electrons in the 6s, 4f and 5d layers, and are easily oxidized to a more stable 4-valent full oxidation state Ce 4+ , forming a fluorite-structured ceria (CeO 2 ); Secondly, the Ce atom can also lose the electrons of 6s and 5d, retain the electrons on the 4f electron ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82Y30/00
CPCB82Y30/00C01F17/206C01P2002/72C01P2004/04C01P2004/64
Inventor 李家俊王习习马丽颖赵乃勤沙军威师春生刘恩佐何春年何芳
Owner TIANJIN UNIV
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