Method of preparing cerium oxide nano-plate

A nano-sheet, cerium oxide technology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problems of reducing the specific surface area of ​​cerium oxide, reducing the performance of cerium oxide, affecting the specific surface area, etc., and achieving easy control of the structure. , The effect of improving catalytic efficiency and large specific surface area

Inactive Publication Date: 2009-04-15
SHANGHAI UNIV
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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.
US2008051283 proposes a method for preparing cerium oxide nanoparticles with a size of 50-1000nm by hydrothermal method. Since

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  • Method of preparing cerium oxide nano-plate

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Embodiment 1

[0016] Example 1: With stirring, dissolve 1 mmol of cerium nitrate and 3 mmol of cetyltrimethylammonium bromide in 35 mL of water, add 5 mL of ammonia water, ultrasonicate for 10 min, transfer to a 50 mL hydrothermal kettle, and heat at 100 °C After hydrothermal heating for 24 hours, the product was centrifuged, washed with deionized water until neutral (pH 7), and dried at 60°C to obtain cerium oxide nanosheets. (The product is square with a size of 20-40 nm and a thickness of 3-5 nm).

Embodiment 2

[0017] Example 2: Dissolve 0.3mmol of cerium chloride and 0.9mmol of cetyltrimethylammonium bromide in 35mL of water, add 5ml of ammonia water, sonicate for 10min, transfer to a 50mL hydrothermal kettle, and heat at 180°C for 24h , the product was centrifuged, washed with deionized water until neutral (pH 7), and dried at 60°C to obtain cerium oxide nanosheets. (The product is rhombohedral and hexagonal, with a size of 10-20 nm and a thickness of 3-5 nm).

Embodiment 3

[0018] Example 3: Dissolve 0.3mmol of cerium ammonium nitrate and 0.9mmol of cetyltrimethylammonium bromide in 35mL of water, add 5ml of ammonia water, sonicate for 10min, transfer to a 50mL hydrothermal kettle, and heat at 120°C for 72h , the product was centrifuged, washed with deionized water until neutral (pH 7), and dried at 60°C to obtain cerium oxide nanosheets. (The products are square, rhombus and hexagonal, with a size of 40-80 nm and a thickness of 3-5 nm).

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Abstract

The invention relates to a method for preparing a cerium oxide nanometer slice, which belongs to the technical field of the preparation of inorganic nanometer materials, and comprises the main steps as follows: (1) the preparation of a cerium salt mixture liquor: chemometry cerium salt of 0.3-1.0mmol and hexadecyl trimethyl ammonium bromide are dissolved by using an appropriate amount of deionized water and made into a mixture liquor; (2) hydro-thermal reaction: the obtained mixture liquor is added with an appropriate amount of ammonia and subjected to ultrasonic dispersion, and then hydro-thermal reaction is carried out for 1-3 days at the temperature of 100-180 DEG C; afterwards, centrifuge separation is carried out, the obtained precipitate is washed by using deionized water so as to lead the pH value to be 7 and neutral, and then drying is carried out at 60 DEG C so as to obtain the cerium oxide nanometer slice. The shape of the cerium oxide nanometer slice obtained by the method is square, or rhombus, or hexagon, with the size of 20-80nm and the thickness of 3-5nm.

Description

technical field [0001] The invention relates to a method for preparing cerium oxide nanosheets, belonging to the technical field of inorganic nanomaterial preparation technology. Background technique [0002] my country is rich in rare earth resources, and its industrial reserves rank first in the world. Among them, cerium oxide, as a rare earth compound, accounts for about 50% of the proven reserves of rare earths. It 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, cerium oxide nanostructures have 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 50 nm by thermal decomposition. Although the yield of t...

Claims

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Application Information

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IPC IPC(8): C01F17/00
Inventor 张登松施利毅潘成思
Owner SHANGHAI UNIV
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