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Preparation method of nano cerium-zirconium solid solution and nano cerium-zirconium solid solution prepared by same

A cerium zirconium solid solution, nanotechnology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as product purity and environmental pollution, achieve simple and stable preparation methods, low production costs, Complete effect of crystal growth

Pending Publication Date: 2022-05-06
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of product purity and environmental pollution in the prior art, the present invention provides a preparation method of nano-cerium-zirconium solid solution and the prepared nano-cerium-zirconium solid solution, and proposes to use insoluble cerium salt and insoluble zirconium salt as raw materials , by adding molten salt and adopting a simple high-temperature calcination process to prepare nano-cerium-zirconium solid solution powder, the nano-cerium-zirconium solid solution prepared by this method has small particle size, uniform particle size distribution, high purity, and large specific surface area , large oxygen storage capacity, good high temperature stability, etc.
Ease of industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a method for preparing a nano-cerium-zirconium solid solution, comprising the following steps:

[0026] S1. Preparation of slurry: Mix the water-insoluble cerium salt and zirconium salt with a mass ratio of 1:0.1~10 to obtain a mixed salt; add molten salt to water and stir until dissolved, add dispersant and surfactant and mix Obtain a mixed solution; gradually add the mixed solution to the mixed salt, mechanically stir until uniformly dispersed, and obtain the desired slurry; wherein, the mass ratio of the mixed salt to the molten salt is 1:0.01-5, and the mixed The mass ratio of salt to water is 1:0.1~5;

[0027] S2. Add water to the slurry and perform ball milling, and pass through an 80-mesh filter sieve to obtain a uniform emulsion / suspension; wherein, the mass ratio of the slurry to water is 0.5-4:1;

[0028] S3. Drop the emulsion / suspension obtained in S2 into a drying device for spray drying under stirring, and obtain a dry powder with ...

Embodiment 2

[0037] In this example, 20g of cerium carbonate and 5g of zirconium carbonate were mixed evenly, 1.75g ​​of ammonium chloride was uniformly dissolved in 7.5g of deionized water at 90°C, and 0.025g of polyethylene glycol and 0.025g of cetyltri Methyl ammonium bromide, then slowly pour it into the mixed powder of 25g cerium carbonate and zirconium carbonate while stirring to obtain a slurry, put the slurry and a certain amount of deionized water into a ball mill at about 400r / min Rotate the ball mill for 8 minutes, pass the ball-milled slurry through an 80-mesh filter sieve and rinse the slurry with an appropriate amount of deionized water to control the mass fraction of the obtained emulsion / suspension to 40%; then the emulsion / suspension Spray drying while stirring, control the spray drying temperature to 115°C, and the feed rate to 550ml / h to obtain a dry powder of the mixture, the water content of the powder after spray drying is not higher than 20wt%; then place the mixture ...

Embodiment 3

[0039] In this example, 20g of cerium carbonate and 5g of zirconium carbonate were mixed evenly, 1.75g ​​of ammonium chloride was uniformly dissolved in 7.5g of deionized water at 90°C, and 0.025g of polyethylene glycol and 0.025g of cetyltri Methyl ammonium bromide, then slowly pour it into the mixed powder of 25g cerium carbonate and zirconium carbonate while stirring to obtain a slurry, put the slurry and a certain amount of deionized water into a ball mill at about 400r / min Rotate the ball mill for 8 minutes, pass the ball-milled slurry through an 80-mesh filter sieve and rinse the slurry with an appropriate amount of deionized water to control the mass fraction of the obtained emulsion / suspension to 40%; then the emulsion / suspension Spray drying while stirring, control the spray drying temperature to 115°C, and the feed rate to 550ml / h to obtain a dry powder of the mixture, the water content of the powder after spray drying is not higher than 20wt%; then place the mixture ...

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Abstract

The invention provides a preparation method of a nano cerium-zirconium solid solution. The preparation method comprises the following steps: S1, preparing slurry; s2, adding water into the slurry, carrying out ball milling, and sieving with a 80-mesh filter sieve to obtain a uniform emulsion / suspension; s3, dropwise adding the emulsion / suspension obtained in the step S2 into drying equipment in a stirring state, and carrying out spray drying to obtain dry powder with the water content not higher than 20wt%; and S4, calcining the dried powder obtained in S3 in a furnace body, and cooling to room temperature after calcining to obtain the nano cerium-zirconium solid solution. According to the method, the insoluble cerium salt and the insoluble zirconium salt are used as raw materials, and the nano cerium-zirconium solid solution with small particle size and uniform particle size distribution can be obtained. The invention further provides the nano cerium-zirconium solid solution.

Description

technical field [0001] The invention relates to the field of material preparation, and specifically provides a method for preparing a nano-cerium-zirconium solid solution. The invention also provides a nano-cerium-zirconium solid solution. [0002] technical background [0003] With the rapid development of the automobile industry, automobile exhaust pollution has aroused widespread concern in the society. The use of three-way catalysts (TWC) to catalyze the purification of automobile exhaust is one of the main ways to solve exhaust pollution. Since the early 1980s, cerium oxide-based high-performance rare earth oxygen storage materials have been widely used in three-way catalysts for automobile exhaust purification, and have become key materials for three-way catalysts, which determine the performance and life of catalysts. The focus of competition among enterprises in the field of automobile exhaust purification catalysts. Due to the poor aging resistance of pure cerium o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J35/02B01J35/10B01J37/00B01J37/08
CPCB01J23/10B01J37/0018B01J37/088B01J35/40B01J35/60
Inventor 韦家谋罗冷
Owner HUNAN UNIV
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