Hollow bead shaped nano-cerium oxide and its preparation method

A nano-cerium oxide and bead-like technology is applied in the field of nano-cerium oxide and its preparation, which can solve the problems of affecting the specific surface area, poor particle size uniformity, and high activity of the cerium oxide crystal plane, and achieves enhanced catalytic performance, improved catalytic efficiency, and improved catalytic performance. The effect of specific surface area

Active Publication Date: 2007-04-18
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Japanese patent JP2004107186 proposed a method for preparing cerium oxide nanospheres with a diameter of about 50 nm by thermal decomposition. Although the yield of this method is large, the solid nanospheres reduce the specific surface area of ​​cerium oxide and reduce its catalytic performance.
U.S. Patent US2005003744 proposes a method for preparing cerium oxide nanoparticles with a size of 10-100 nm by hydrothermal method. Since no other templates are used, the uniformity of particle size is poor
Chinese patent CN1556039 proposes a method for preparing cerium oxide nanocubes and cerium oxide nanowires by a hydrothermal method. Due to the high activity of cerium oxide crystal planes with this structure, the structure stability is poor, and the performance of nanomaterials is reduced.
Chinese patent CN1683248 proposes a method for preparing cerium oxide nanoparticles by the coordination precipitation method. Although the size of the nanoparticles is 5-10nm, they are easily agglomerated together, which affects their specific surface area, thereby reducing the cerium oxide. performance
Chinese patent CN1704339 proposes a method for preparing cerium oxide nanoparticles by precipitation method, but it is also very easy to agglomerate together
And easy to reunite is also their common defect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: Under the situation of stirring, 2mmol of cerium nitrate is dissolved in 30mLN, in the mixed solution of N-dimethylformamide and 10ml ethanol, then the carbon nanotube (diameter 40~50nm) after 0.1g purification Add it into this solution and sonicate for 40-120min, transfer it to a 50mL hydrothermal kettle, heat it at 180°C for 24h, centrifuge the product, wash it with deionized water until neutral (pH is 7), and dry it at 60°C to obtain Hollow bead-shaped nano cerium oxide and carbon nanotube composite material, the color of the composite material is gray, and the weight gain is about 100%. Take 0.02g hollow bead-shaped nano-cerium oxide and carbon nanotube composite material, put it into a crucible, raise the temperature to 550°C at a heating rate of 5k / min, and keep the temperature for 30min. The color of the composite material changes from black to white, and the hollow bead-shaped Nano cerium oxide (inner diameter 40-50nm, outer diameter 80-120nm).

Embodiment 2

[0019] Embodiment two: under the situation of stirring, the cerium chloride of 1mmol is dissolved in 20mLN, in the mixed solution of N-dimethylformamide and 20ml ethanol, then the carbon nanotube (20~40nm in diameter) after 0.08g purification ) was added to the solution and sonicated for 40-120min, transferred to a 50mL hydrothermal kettle, heated at 120°C for 72h, the product was centrifuged, washed with deionized water until neutral (pH 7), and dried at 60°C, that is A composite material of hollow bead nano cerium oxide and carbon nanotube is obtained, the color of the composite material is gray, and the weight gain is about 100%. Take 0.02g hollow bead-shaped nano-cerium oxide and carbon nanotube composite material, put it into a crucible, raise the temperature to 550°C at a heating rate of 10k / min, and keep the temperature constant for 30min. The color of the composite material changes from black to white, and the hollow bead-shaped Nano cerium oxide (inner diameter 20-40n...

Embodiment 3

[0020] Embodiment three: under the situation of stirring, the ceric ammonium nitrate of 4mmol is dissolved in 10mLN, in the mixed solution of N-dimethylformamide and 30ml ethanol, then the carbon nanotube (diameter 10~30nm) after 0.15g purification ) into the solution and ultrasonically for 40-120min, transferred to a 50mL hydrothermal kettle, heated at 120°C for 36h, the product was centrifuged, washed with deionized water until neutral (pH 7), and dried at 60°C, that is A composite material of hollow bead nano cerium oxide and carbon nanotube is obtained, the color of the composite material is gray, and the weight gain is about 100%. Take 0.02g hollow bead-shaped nano-cerium oxide and carbon nanotube composite material, put it into a crucible, raise the temperature to 450°C at a heating rate of 10k / min, and keep the temperature constant for 30min. The color of the composite material changes from black to white, and the hollow bead-shaped Nano cerium oxide (inner diameter 10-...

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Abstract

The present invention relates to a hollow pearl nano cerium oxide and its preparation method. The invented nano cerium oxide is a spherical granule whose diameter is 80-200 nm and centre has a through hole whose diameter is 10-60 nm. Said invention utilizes organic solvent to make the cerium salt be dissolved, and further utilizes solvent heat to make the hollow pearl nano cerium oxide be formed on the surface of carbon nano tube, then the template is removed, so that the correspondent hollow pearl nano cerium oxide can be obtained.

Description

technical field [0001] The invention relates to a nano cerium oxide and its preparation technology, in particular to a hollow bead nano cerium oxide and a preparation method thereof. Background technique [0002] my country is very rich in rare earth resources, accounting for more than 80% of the world's proven reserves, and its industrial reserves rank first in the world. Among them, cerium compounds account for about 50% of the proven reserves. As a compound of cerium, cerium oxide has important applications in automobile exhaust purification, solid fuel cells, catalytic cracking of fluids, and chemical mechanical polishing abrasives. Due to its special properties such as large specific surface area, small grain size and high surface activity of specific nanostructures, nano-cerium oxide has become one of the hot spots in the synthesis of cerium oxide. [0003] Japanese patent JP2004107186 proposes a method for preparing cerium oxide nanospheres with a diameter of about ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82B1/00
Inventor 施利毅张登松潘成思付红霞方建慧
Owner SHANGHAI UNIV
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