Praseodymium-doped cerium-zirconium carrier catalyst and preparation method thereof

Abstract

The invention relates to a solid solution carrier catalyst, and specifically relates to a praseodymium-doped cerium-zirconium carrier catalyst. The carrier catalyst comprises the chemical components of, by weight, 30-50 parts of cerium oxide, 30-50 parts of zirconium oxide, 1-5 parts of praseodymium oxide and 1-5 parts of transition metal. The transition metal is a mixture of vanadium oxide, chromium oxide, manganese oxide, iron oxide, cobalt oxide and copper oxide. The invention also provides a preparation method of the carrier catalyst. According to the invention, all the raw materials are mixed; a surfactant is added; the pH is regulated to 8-10, and a colloidal precipitate is obtained; and the product is obtained by baking. With the method provided by the invention, a doping defect caused by doping in a cerium-zirconium carrier is overcome, and carried catalyst thermal stability and performance indexes such as aging specific surface area, oxygen storage capacity, and the like are greatly improved. The invention also provides the preparation method of the carrier catalyst. The raw materials are cheap, process is simple, and the method is suitable for large-scale industrialized productions.

Description

technical field [0001] The invention relates to a solid solution carrier catalyst, in particular to a praseodymium-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...

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.