Binary cerium-zirconium doped supported catalyst and preparation method thereof

Abstract

The invention relates to a solid solution, namely a supported catalyst and in particular relates to a binary cerium-zirconium doped supported catalyst. The supported catalyst comprises the following chemical components in parts by weight: 30-50 parts of cerium oxide, 30-50 parts of zirconium oxide and 1-20 parts of other rare earth oxides, wherein other rare earth oxides are at least two of lanthanum oxide, praseodymium oxide, neodymium oxide, yttrium oxide or samarium oxide. The invention also provides a preparation method of the supported catalyst. The preparation method comprises the steps of mixing all the raw materials, adding surfactants, then adjusting the pH value to 8-10 to obtain a colloidal precipitate, and roasting to obtain the product. The supported catalyst and the preparation method have the advantages that doping defects caused by doping in cerium-zirconium supports are overcome; meanwhile, the performance indexes of the supported catalyst, such as heat stability, aging specific surface area, oxygen storage capacity and the like are greatly improved; the preparation method is low in raw material price and simple in 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 binary doped cerium-zirconium carrier catalyst and a preparation method thereof. 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.