Method for effectively regulating particle size of ceric oxide mesoporous sphere and application thereof

A technology of ceria and mesoporous spheres, applied in chemical instruments and methods, rare earth metal oxides/hydroxides, inorganic chemistry, etc., can solve the problem of expensive surfactants, inducers, stabilizers or templates, difficult The scale control of ceria mesoporous materials, unfavorable large-scale production and application, etc., achieve the effect of simple and easy follow-up processing, good monodispersity and high yield

Inactive Publication Date: 2017-11-24
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, the current method not only needs to add expensive surfactants, inducers, stabilizers or templates in the synthesis process, but also the subsequent treatment process is cumbersome and complicated, which is o

Method used

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  • Method for effectively regulating particle size of ceric oxide mesoporous sphere and application thereof
  • Method for effectively regulating particle size of ceric oxide mesoporous sphere and application thereof
  • Method for effectively regulating particle size of ceric oxide mesoporous sphere and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of 30nm CeO2 Mesoporous Spheres

[0024] Under stirring conditions, 2.1 milliliters of deionized water were added to 67.9 milliliters of ethylene glycol solution, stirred evenly to obtain a water-containing ethylene glycol solution, then 1.52 g of cerium nitrate hexahydrate was added, and stirred for 30 minutes at 500 rpm to make Cerium nitrate was completely dissolved to obtain a reaction precursor solution for preparing cerium oxide mesoporous spheres, wherein the concentration of cerium nitrate was 0.05 mol / liter, and the volume percentage of water content was 3%. Immediately afterwards, the prepared reaction precursor solution was reacted in an oil bath at 180 degrees for 1 hour to obtain a colloidal solution of ceria mesoporous spheres; After centrifuging at a speed of 14,000 rpm for 30 minutes, remove the colorless solution in the centrifuge tube to obtain a yellow precipitate product; use deionized water or absolute alcohol to ultrasonically clean the...

Embodiment 2

[0026] Preparation of 50nm CeO2 Mesoporous Spheres

[0027] Under stirring conditions, 2.8 milliliters of deionized water were added to 67.2 milliliters of ethylene glycol solution, stirred evenly to obtain aqueous ethylene glycol solution, then added 1.52 g of cerium nitrate hexahydrate, and stirred for 30 minutes at 500 rpm to make Cerium nitrate was completely dissolved to obtain a reaction precursor solution for preparing cerium oxide mesoporous spheres, wherein the concentration of cerium nitrate was 0.05 mol / liter, and the volume percentage of water content was 4%. Immediately afterwards, the prepared reaction precursor solution was reacted in a 180-degree oil bath for 2 hours to obtain a colloidal solution of ceria mesoporous spheres; After centrifuging at 12,000 rpm for 30 minutes, remove the colorless solution in the centrifuge tube to obtain a yellow precipitated product; use deionized water or absolute alcohol to ultrasonically clean the obtained precipitated produc...

Embodiment 3

[0029] Preparation of 100nm CeO2 Mesoporous Spheres

[0030]Under agitation, add 3.5 milliliters of deionized water to 66.5 milliliters of ethylene glycol solution, stir evenly to obtain a water-containing ethylene glycol solution, then add 1.52 g of cerium nitrate hexahydrate, and stir for 30 minutes at 500 rpm to make Cerium nitrate was completely dissolved to obtain a reaction precursor solution for preparing cerium oxide mesoporous spheres, wherein the concentration of cerium nitrate was 0.05 mol / liter, and the volume percentage of water content was 5%. Immediately afterwards, the prepared reaction precursor solution was reacted in a 180-degree oil bath for 4 hours to obtain a colloidal solution of ceria mesoporous spheres; After centrifuging at 10,000 rpm for 30 minutes, remove the colorless solution in the centrifuge tube to obtain a yellow precipitate product; use deionized water or absolute alcohol to ultrasonically clean the obtained precipitate product 5-6 times, and...

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Abstract

The invention relates to a method for effectively regulating a particle size of a ceric oxide mesoporous sphere and application thereof to preparation of ceric oxide mesoporous spheres of different scales. The method is characterized in that any other surfactant or inducer or stabilizer or template agent does not need to be added in the preparation process except cerate and a reaction solvent, and the scale can be effectively regulated by virtue of the moisture content in a precursor. The method comprises the following preparation steps: (1) sequentially adding deionized water and cerous nitrate into ethylene glycol under stirring conditions so as to obtain a precursor for preparing the ceric oxide mesoporous sphere; (2) reacting the reactive precursor solution in an oil bath of 180 DEG C for 0.5-6 hours, and preparing a yellow ceric oxide mesoporous sphere colloidal solution; (3) performing centrifugal separation on the ceric oxide mesoporous sphere colloidal solution by using a high speed centrifuge, performing ultrasonic cleaning for 3-5 times, thereby obtaining the ceric oxide mesoporous spheres of different scales. The ceric oxide mesoporous spheres prepared by the method disclosed by the invention can be applied to the aspects such as automotive exhaust purification, catalytic oxidation of carbon monoxide, mechanical polishing and the like.

Description

technical field [0001] The invention relates to a method for effectively regulating the particle size of ceria mesoporous spheres and its application in the preparation of ceria mesoporous spheres of different scales, belonging to the field of controllable preparation of nanomaterials. Background technique [0002] Cerium dioxide is a rare earth oxide with good stability, high hardness, and excellent redox and oxygen storage and oxygen release capabilities. It is currently widely used in automobile exhaust purification, carbon monoxide catalytic oxidation, mechanical polishing, fuel cells, and waste gas and wastewater treatment. and many other fields. Therefore, the controlled synthesis, structure-activity relationship, and application research of ceria nanomaterials have attracted much attention in recent years. People use methods such as hydrothermal, solvothermal, sol-gel, microemulsion, precipitation calcination, template-assisted, electrochemical deposition, etc. Ceri...

Claims

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Application Information

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IPC IPC(8): C01F17/00
CPCC01P2002/72C01P2002/84C01P2004/03C01P2004/04C01P2004/50C01P2004/51C01P2004/62C01P2004/64C01P2006/12C01P2006/17C01F17/206
Inventor 韦云威李村成杨晓冬陈国柱段中尧刘广宁
Owner UNIV OF JINAN
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