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

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...

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 obviously not conducive to large-scale production and application

At the same time, it is difficult to effectively control the scale of ceria mesoporous materials in the same reaction system using the current synthesis process.

Images