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Cerium dioxide nanosheet as well as preparation method and application thereof

A technology of ceria and nanosheets, which is applied in the field of ceria nanosheets and its preparation, can solve the problems of high environmental hazards, limited applications, and obstacles to the interaction between substrate molecules and nanoparticles, and achieve high specific surface area and catalytic performance. high efficiency effect

Active Publication Date: 2018-12-21
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large specific surface area and high surface energy of metal nanoparticles, metal nanoparticles are prone to agglomeration, which greatly reduces the reactivity of metal nanoparticles and limits their applications.
The modification of noble metal nanoparticles by surfactants can effectively improve the dispersion of nanoparticles, but a large number of surfactant molecules occupy the active sites of metal nanoparticles, thereby hindering the interaction between substrate molecules and nanoparticles and reducing the concentration of noble metal nanoparticles. The activity of nanoparticles, and the use of a large amount of surfactants in the preparation process is very harmful to the environment

Method used

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  • Cerium dioxide nanosheet as well as preparation method and application thereof
  • Cerium dioxide nanosheet as well as preparation method and application thereof
  • Cerium dioxide nanosheet as well as preparation method and application thereof

Examples

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Embodiment 1

[0072] This embodiment provides a method for preparing a ceria nanocomposite material, the preparation method comprising the following steps:

[0073] (1) 20 DEG C under the protection of nitrogen, the molar concentration of the hydroxide ion is that the sodium hydroxide aqueous solution of 3mol / L is added dropwise in the cerium nitrate aqueous solution that the molar concentration of cerium nitrate is 0.05mol / L, the said hydroxide The molar ratio of root ion and described cerium nitrate is 18:1, and the speed of described dropping is 14mL / h, stirs cerium nitrate aqueous solution in precipitation process, and the time of described stirring is 9h, and the speed of described stirring is 1000r / h min, wash the precipitate to neutrality, and obtain the cerium hydroxide nanosheet precursor;

[0074] (2) Freeze-drying step (1) obtained cerium hydroxide nanosheet precursor, under the condition of 600 ℃, the cerium hydroxide nanosheet precursor after freeze-drying is roasted, and the t...

Embodiment 2

[0079] This embodiment provides a method for preparing a ceria nanocomposite material, the preparation method comprising the following steps:

[0080] (1) 25 DEG C under argon protection, the molar concentration of hydroxide ion is that the sodium hydroxide aqueous solution of 4mol / L is added dropwise in the cerium nitrate aqueous solution that the molar concentration of cerium nitrate is 0.06mol / L, the hydrogen The mol ratio of oxygen ion and described cerium nitrate is 12:1, and the speed of described dropping is 16mL / h, stirs cerium nitrate aqueous solution in precipitation process, and the time of described stirring is 12h, and the speed of described stirring is 1200r / min, wash and precipitate to neutrality, and obtain the precursor of cerium hydroxide nanosheet;

[0081] (2) Freeze-drying step (1) obtained cerium hydroxide nanosheet precursor, under the condition of 420 ℃, the cerium hydroxide nanosheet precursor after freeze-drying is roasted, and the time of described ...

Embodiment 3

[0086] This embodiment provides a method for preparing a ceria nanocomposite material, the preparation method comprising the following steps:

[0087] (1) 15 DEG C under the protection of helium, the molar concentration of hydroxide ion is 2mol / L potassium hydroxide aqueous solution is added dropwise in the cerium nitrate aqueous solution that the molar concentration of cerium nitrate is 0.02mol / L, the hydrogen The mol ratio of oxygen ion and described cerium nitrate is 10:1, and the speed of described dropping is 12mL / h, stirs cerium nitrate aqueous solution in precipitation process, and the time of described stirring is 6h, and the speed of described stirring is 800r / min, wash and precipitate to neutrality, and obtain the precursor of cerium hydroxide nanosheet;

[0088] (2) Freeze-drying step (1) obtained cerium hydroxide nanosheet precursor, under the condition of 400 ℃, the cerium hydroxide nanosheet precursor after freeze-drying is roasted, and the time of described roa...

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Abstract

The invention relates to cerium dioxide nanosheets as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) precipitating a cerous nitrate solution with an alkali solution so as to obtain a cerium hydroxide nanosheet precursor; (2) drying and roasting the cerium hydroxide nanosheet precursor obtained in the step (1), thereby obtaining cerium dioxide nanosheets, wherein the alkali solution of the step (1) comprises a sodium hydroxide solution and / or a potassium hydroxide solution, and the mole ratio of hydroxide ions in the alkali solution to cerous nitrate in the cerous nitrate solution is (8-27):1. The cerium dioxide nanosheets provided by the invention can be used as multiple nano metallic carriers and have very good application prospects in fields of energy, environment protection and catalysis. The cerium dioxide nanosheets has the advantages of being free of high-temperature high-pressure equipment for hydrothermal reactions and the like, free of organic modifier or organic solvent, good in environment protection, gentle in reaction condition, low in cost, and the like, and is beneficial to industrial amplified production.

Description

technical field [0001] The invention belongs to the field of composite material preparation, and relates to a nanocomposite material and its preparation method and application, in particular to a cerium oxide nanosheet and its preparation method and application. Background technique [0002] Ce 4+ / C 3+ Redox transformation and abundant oxygen vacancies make nano ceria widely used as catalyst and catalyst carrier in the fields of energy, environment and catalysis. The catalytic activity of nano-ceria is closely related to its exposed crystal plane. As a catalyst and catalyst carrier, the (100) and (110) crystal planes of ceria have higher activity than the (111) crystal plane, so the preparation of exposed Nano ceria with highly active crystal facets is a research hotspot. At present, the methods for preparing nano ceria mainly include precipitation method, hydro(solvent) thermal method, sol-gel method, microemulsion method and so on. [0003] Liu Zien and others publish...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82Y40/00B01J23/42B01J23/46B01J23/52
CPCB01J23/42B01J23/468B01J23/52B82Y40/00C01P2004/04C01P2004/24C01P2004/61C01P2004/62C01P2004/64C01P2006/12C01P2006/16C01F17/206
Inventor 杨蓉刘学良王琛
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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