Method for preparing ceria mesoporous hollow ball

A technology of mesoporous hollow spheres and cerium oxide, which is applied in the field of nanomaterials, can solve the problems of inability to realize the continuous control of the hollow structure of mesoporous nanospheres, the long time required for the curing method, and the cumbersome post-processing process of the template method, etc., and achieve easy Batch preparation, easy monitoring and control, and the effect of large-scale production

Inactive Publication Date: 2013-11-13
SHANDONG UNIV
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Problems solved by technology

However, the size of the hollow spheres prepared by this method is large and the scale distribution is uneven, and the continuous regulation of the hollow structure of the mesoporous nanospheres cannot be realized.
[0004] In summary, in the existing methods for preparing ceria mesoporous hollow spheres, the post-treatment process of the template method is relatively cumbersome, and the aging method requires a relatively long time, which affects production efficiency

Method used

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  • Method for preparing ceria mesoporous hollow ball
  • Method for preparing ceria mesoporous hollow ball
  • Method for preparing ceria mesoporous hollow ball

Examples

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Embodiment 1

[0027] Embodiment 1: at first 0.5gCe(NO 3 ) 3 ·6H 2 O was dissolved in 0.5 mL deionized water, and 0.5 mL propionic acid was added to the above solution. The obtained homogeneous solution was added to a 15 mL autoclaved autoclave, the remaining space was filled with ethylene glycol solvent, and the filling rate of the autoclave was 100%. The autoclave was then sealed and heated to 180° C. for 200 minutes at a constant temperature. Among them, a pressure of 45 MPa is applied in the first 120 minutes of constant temperature, and a pressure of 150 MPa is applied in the last 80 minutes of constant temperature. After the constant temperature reaction was over, the heating was stopped and the reactor was naturally cooled to room temperature. Next, the product was washed with deionized water and ethanol and centrifuged to remove by-products, and the product was dried at 60° C. to obtain ceria mesoporous hollow spheres. The hollow spheres have an average outer diameter of 80 nm a...

Embodiment 2

[0031] Example 2: The preparation method is the same as in Example 1, except that the pressure applied in the last 80 minutes is 120 MPa, and the obtained product ceria mesoporous hollow spheres have an average outer diameter of 80 nanometers and an average inner diameter of 50 nanometers.

Embodiment 3

[0032] Example 3: The preparation method was the same as that of Example 1, except that the pressure applied in the last 80 minutes was 90 MPa, and the obtained product ceria mesoporous hollow spheres had an average outer diameter of 80 nanometers and an average inner diameter of 40 nanometers.

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Abstract

The invention relates to a method for preparing a ceria mesoporous hollow ball. The method comprises the following steps of dissolving a cerium nitrate hexahydrate in deionized water, respectively adding propionic acid and glycol into the solution to obtain a mixed solution, adding the mixed solution into a hot pressure reactor, sealing the hot pressure reactor, wherein a constant temperature reaction undergoes in the hot pressure reactor, applying certain pressure to the reaction system in the constant temperature reaction, wherein constant pressure I of 30-120 MPa is applied in first 100-120min and constant pressure II of 60-150 MPa is applied after first 100-120min and the pressure II is greater than the pressure I, and carrying out forced diffusion of a solvent into ceria mesoporous balls by a pressure difference to obtain the ceria mesoporous hollow balls by dissolution-re-precipitation. The ceria mesoporous hollow ball has the characteristics of controllable inner and outer diameters, high yield, high purity and good dispersibility. The method has simple processes, is environmentally friendly and can be massively prepared.

Description

technical field [0001] The invention relates to a method for preparing ceria mesoporous hollow spheres, belonging to the technical field of nanometer materials. Background technique [0002] Cerium dioxide is a very important light rare earth material, because of its excellent performance, it has a wide application prospect in industrial production. At present, cerium dioxide is mainly used in luminescent materials, automobile exhaust purification materials, advanced polishing powder, etc. Especially mesoporous hollow spherical nano ceria has very high application value in the field of improving the performance of three-way catalysts due to its high specific surface area and good pore structure. Currently, the methods used to prepare ceria mesoporous hollow spheres mainly include template method and aging method. [0003] CN101117233A discloses a method for preparing mesoporous cerium oxide microspheres with high specific surface area, which is characterized in that spheri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 廉刚王军司海滨张晓崔得良王琪珑
Owner SHANDONG UNIV
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