Preparation method of low-cost large-specific-surface-area cerium oxide

Abstract

The invention relates to a solid solution carrier catalysis, and specifically relates to a preparation method of low-cost large-specific-surface-area cerium oxide. According to the invention, water solutions corresponding to all raw materials are mixed; a surfactant is added; the pH value is regulated to 8-10, such that a gel precipitate is obtained; washing and roasting are carried out; drying and grinding are carried out; trifluoromethanesulfonic acid is added to the product, and the mixture is well mixed; and drying is carried out, such that the cerium oxide is obtained. The raw materials are cheap, and the process procedure of the method is simple. With the method, a doping defect caused by doping in a cerium oxide carrier is overcome. Also, performance indexes such as thermal stability, aging specific surface area, oxygen storage capacity, and the like of the carrier catalyst are greatly improved.

Description

technical field [0001] The invention relates to a solid solution carrier catalyst, in particular to a method for preparing cerium oxide with low cost and large specific surface area. Background technique [0002] As an important catalyst carrier, cerium oxide has unique oxygen storage capacity and other excellent properties. Cerium ions generate Ce in an oxidizing or reducing atmosphere 3+ and Ce 4+ Oxidation-reduction reaction between them, so as to realize the function of oxygen storage and oxygen release, which is helpful to realize the catalytic conversion of automobile exhaust, etc., but pure cerium oxide is very easy to sinter at high temperature, resulting in a decline in the ability to store and release oxygen. Doping an appropriate amount of zirconium to form a cerium-zirconium-based oxide solid solution can greatly improve the high-temperature aging resistance and oxygen storage and release properties of cerium oxide. Therefore, research on the synthesis of ceriu...

AI Technical Summary

Problems solved by technology

Cerium ions generate Ce in an oxidizing or reducing atmosphere 3+ and Ce 4+ Oxidation-reduction reaction between them, so as to realize the function of oxygen storage and oxygen release, which is helpful to realize the catalytic conversion of automobile exhaust, etc., but pure cerium oxide is very easy to sinter at high temperature, resulting in a decline in the ability to store and release oxygen. Doping an appropriate amount of zirconium to form a cerium-zirconium-based oxide solid solution can greatly improve the high-temperature aging resistance and oxygen storage and release properties of cerium oxide. Therefore, research on the synthesis of cerium-zirconium-based oxide solid solutions has attracted widespread attention.

However, the existing cerium oxide supported catalysts have defects such as high production cost, serious powder agglomeration, and small specific surface area.

[0003] In the prior art, cerium carbonate, cerium hydroxide, cerium ammonium chloride, and tetravalent cerium chloride are mostly used as the main raw materials for the production of cerium oxide. These raw materials have the defects of high production cost and serious environmental pollution, so it is difficult to realize industrialization Furthermore, most of the current research is still in the field of high-pressure reaction, microwave reaction and mesoporous reaction. This experimental scheme has large investment, high production cost, high risk factor, cumbersome process control, and is not easy to realize industrialization.