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Cerium oxide nano materials and its preparation and use

A technology of nanomaterials and cerium oxide, applied in chemical instruments and methods, polycrystalline material growth, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of low initial solution concentration, low yield, and reduced product purity, etc. problem, to achieve the effect of cheap precipitant and high catalytic activity

Inactive Publication Date: 2006-10-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] As can be seen from the above several preparation methods, the current method still has several significant disadvantages: (1) template or surfactant is introduced into the reaction system; (2) sodium ions are introduced into the reaction system; (3) There are many steps; (4) the initial solution concentration is too low, resulting in low yield; (5) the shape and size of cerium oxide nanoparticles cannot be controlled by changing the reaction conditions; (6) there is no synthesis method for nanoprism-related materials
The introduction of templates or surfactants and sodium ions complicates the preparation process, increases the preparation cost, and reduces the purity of the product, so it is inevitable to add additional elution work, and the initial concentration is too low to make these methods difficult. Realize practicality

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  • Cerium oxide nano materials and its preparation and use
  • Cerium oxide nano materials and its preparation and use
  • Cerium oxide nano materials and its preparation and use

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Preparation of precursor solution: 1 g Ce(NO 3 ) 3 ·6H 2 O was added to 4.5g of urea, then deionized water was added, dissolved under stirring, and finally diluted to 40ml with water to obtain a precursor solution; the above solution was poured into a hydrothermal reaction kettle, and treated with 140°C hydrothermal treatment, and the temperature was 2 hours, take it out and cool to room temperature, filter with suction, wash, dry at 120°C for 2 hours, and bake at 450°C for 1 hour. figure 1 X-ray powder diffraction pattern for the product. figure 2 It is the scanning electron microscope result of the product, which shows that the calcined sample is nanofiber. BET test shows that the specific surface area is 100m 2 / g.

Embodiment 2

[0038] Ce(NO 3 ) 3 ·6H 2 The add-on of O is 2g, all the other conditions are with embodiment 1. SEM ( image 3 ) measured that the roasted sample is a nanorod with a diameter of 20-100 nanometers and a length of 100 nanometers-3 microns.

Embodiment 3

[0040] Ce(NO 3 ) 3 ·6H 2 The add-on of O is 10g, all the other conditions are with embodiment 1. SEM ( Figure 4 ) measured that the roasted sample is a nanorod with a diameter of 40-100 nanometers and a length of 100 nanometers-2 microns. BET test shows that the specific surface area is 120m 2 / g.

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Abstract

The related preparation method for nano product of cerium oxide comprises: with water, organic solution or mixed solvent, taking hydrothermal process the soluble cerium salt, and obtaining the product as nano granule, nano rod, nano fiber, and nano prism all with well catalytic activity. This invention is simple and low cost, and has wide application.

Description

technical field [0001] The invention relates to a nanometer material of cerium oxide. [0002] The present invention also relates to a preparation method of the above-mentioned nanometer material. [0003] The present invention also relates to the application of the above-mentioned nanomaterials. Background technique [0004] There have been many reports on cerium oxide nanoparticles and their preparation methods. On the one hand, cerium oxide nanoparticles are often used as supports for complete or partial oxidation catalysts of hydrocarbons and automobile exhaust three-way catalysts; on the other hand, cerium oxide nanoparticles can be directly used as abrasives, catalysts, fluorescent materials, chemical sensors, etc. [0005] In the field of application of cerium oxide, spherical nanoparticles of cerium oxide are currently used. These cerium oxide nanoparticles are mainly prepared by a precipitation method using precipitants such as ammonia water, carbonate, sodium hy...

Claims

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Application Information

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IPC IPC(8): C01F17/00C30B7/10C30B29/16C30B29/62B01J23/10B01J35/02
Inventor 李灿关业军应品良蒋宗轩
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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