Preparation method of cerium-aluminum composite oxide with low cost and large specific surface area

Abstract

The invention relates to a solid solution supported catalyst, and in particular to a preparation method of a cerium-aluminum composite oxide with low cost and large specific surface area. The preparation method is characterized by comprising the following steps: (1) adding alumina hydrate in 100-170g / L of a cerium chloride aqueous solution, pulping to obtain a mixed liquid, adding 0.1-1 percent of a surfactant (by weight percentage) of the mixed liquid, uniformly stirring, putting the mixed liquid in a constant-temperature tank, and standing for 1-2h; (2) adding ammonia water or ammonium carbonate in a feed solution subjected to treatment in the first step, and controlling a pH value to be 8-10 to obtain gelatinous precipitates; (3) washing the gelatinous precipitates obtained in the second step with deionized water, and carrying out dehydration; (4) putting a product obtained through dehydration in the third step in a kiln, and roasting the product under the condition with the temperature being 500-700 DEG C for 4-6h; and (5) grinding the product subjected to roasting until the maximum particle size is 10 microns to obtain the cerium-aluminum composite oxide with large specific surface area. The preparation method is low in cost of raw materials and simple in technological process and is beneficial to large scale industrial production.

Description

technical field [0001] The invention relates to a solid solution carrier catalyst, in particular to a method for preparing a low-cost and large specific surface area cerium-aluminum composite oxide. 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 sy...

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, most of them use cerium carbonate and cerium hydroxide as the main raw materials for producing cerium oxide. These raw materials have the defects of high production cost and serious environmental pollution, so it is difficult to realize industrialization; In the field of 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