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Normal-pressure preparation method of rare-earth oxide doped cerium oxide aerogel

A rare earth oxide, cerium oxide technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, chemical/physical processes, etc. problems such as glue shrinkage, to achieve the effects of easy filtration and recovery, high specific surface area, and low cost

Active Publication Date: 2020-12-11
ANHUI ESTONE MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the expensive supercritical drying equipment, harsh drying conditions, and high risk factor, it cannot meet the needs of low-cost and easy-to-implement industrial production.
When using normal pressure drying, although the cost is low and easy to implement, due to the effect of surface tension, the gel will shrink during drying, causing the gel structure to rupture and collapse.

Method used

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  • Normal-pressure preparation method of rare-earth oxide doped cerium oxide aerogel
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  • Normal-pressure preparation method of rare-earth oxide doped cerium oxide aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 2.98g of cerous chloride heptahydrate and add it to 14mL ethanol solution, stir at 700r / min until it dissolves completely, then add 0.513g of samarium chloride and stir until completely dissolved to obtain the alcoholic solution of the metal salt; 11 mL of propylene oxide was added dropwise into the solution, and stirred at 1000 r / min for 5 min after the drop was completed, then the reactor was sealed and allowed to stand at room temperature to obtain a wet gel. In order to maintain the wet state of the wet gel, a small amount of ethanol is added to the wet gel, and it is sealed and aged at room temperature for 24 hours. After that, the wet gel is immersed in the ethanol solution according to the solid-to-liquid volume ratio of 1:1, and the solvent is carried out at room temperature. Replacement, repeated three times. Finally, the wet gel after solvent replacement is dried under normal pressure in the range of 20-200° C. to obtain airgel particles.

Embodiment 2

[0035] Weigh 0.24g of cerous chloride heptahydrate and add it to 14mL ethanol solution, stir at 700r / min until it dissolves completely, then add 0.15g of samarium chloride and stir until completely dissolved to obtain the alcoholic solution of the metal salt; 11 mL of propylene oxide was added dropwise into the solution, and stirred at 1000 r / min for 5 min after the drop was completed, then the reactor was sealed and allowed to stand at room temperature to obtain a wet gel. In order to maintain the wet state of the wet gel, a small amount of ethanol is added to the wet gel, and it is sealed and aged at room temperature for 24 hours. After that, the wet gel is immersed in the ethanol solution according to the solid-to-liquid volume ratio of 1:0.5, and the solvent is carried out at room temperature. Replacement, repeated 4 times. Finally, the wet gel after solvent replacement is dried under normal pressure in the range of 20-200° C. to obtain airgel particles.

Embodiment 3

[0037] Take by weighing 5.6g cerous chloride heptahydrate and join in 14mL ethanol solution, stir until dissolving completely with 700r / min, then add 0.64g samarium chloride and stir until completely dissolving to obtain the alcoholic solution of metal salt; Add 11 mL of propylene oxide dropwise to the solution, and stir at 1000 r / min for 5 min after the dropping, then seal the reactor and let it stand at room temperature to obtain a wet gel, then seal the reactor and stand at room temperature to obtain a wet gel. In order to maintain the wet state of the wet gel, add a small amount of ethanol to the wet gel, and seal it at room temperature for 24 hours to age, then soak the wet gel in the ethanol solution according to the solid-to-liquid volume ratio of 1:2, and carry out the solvent at room temperature Replacement, repeat 2 times. Finally, the wet gel after solvent replacement is dried under normal pressure in the range of 20-200° C. to obtain airgel particles.

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Abstract

The invention discloses a normal-pressure preparation method of rare-earth oxide doped cerium oxide aerogel, and relates to the technical field of rare-earth oxide aerogel. An inorganic cerium salt isused as a precursor, a rare-earth inorganic salt is used as a doping phase, wet gel is obtained by a complexing agent for modification and a gelling catalyst and through a sol-gel process, and rare-earth oxide doped cerium oxide aerogel large particles are obtained through normal-pressure drying. The cerium oxide aerogel particles prepared by the method are low in cost, are not pulverized when meeting water, have the specific surface area of 244 m<2> / g, and have the advantages of high specific surface area, low density and the like, and due to the face that the obtained aerogel particles arerelatively large, after being applied to a liquid environment, the aerogel particles are easy to filter and recycle compared with powder.

Description

Technical field: [0001] The invention relates to the technical field of rare earth oxide aerogels, in particular to an atmospheric pressure preparation method of rare earth oxides mixed with cerium oxide aerogels. Background technique: [0002] Cerium oxide is the most studied material among rare earth oxides, with a fluorite structure, where Ce is represented by Ce 3+ and Ce 4+ The double oxidation method exists and can undergo reversible transformation. When cerium oxide is transformed into cerium oxide, it exists in a metastable structure. There are a large number of oxygen vacancies in the structure, and it has good ion conductivity and oxygen storage capacity. It has been used in biology, It has been applied in fields such as environment, catalysis, sensor and fuel cell. [0003] These special properties of cerium oxide are mainly related to the particle size and specific surface area of ​​the synthesized cerium oxide. The larger the specific surface area of ​​cerium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26B01J31/06B01J35/10B01J35/02B01J35/00
CPCB01J31/26B01J31/06B01J35/50B01J35/61B01J35/615Y02E60/50
Inventor 李文龙蒋学鑫王韶晖
Owner ANHUI ESTONE MATERIAL TECH CO LTD
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