Binary doped cerium-zirconium carrier catalyst and preparation method thereof

Abstract

The invention relates to a solid solution carrier catalyst, in particular to a binary doped cerium-zirconium carrier catalyst. The chemical composition and weight content are: 30-50 parts of cerium oxide, 30-50 parts of zirconia, 1-20 parts of other rare earth oxides; among them, other rare earth oxides are: lanthanum oxide, praseodymium oxide, neodymium oxide, yttrium oxide or at least two of samarium oxide. The invention also provides a preparation method thereof. All raw materials are mixed, a surfactant is added, and the pH is adjusted to 8-10 to obtain a colloidal precipitate, and the product is obtained after roasting. The invention overcomes the doping defects caused by doping in the cerium-zirconium carrier, and at the same time greatly improves the thermal stability, aging specific surface area, oxygen storage capacity and other performance indicators of the carrier catalyst; the invention also provides its preparation method, raw material price Inexpensive, simple process, and conducive 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.