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

Abstract

The invention relates to a solid solution carrier catalyst and particularly relates to a multi-doped cerium-zirconium carrier catalyst. The chemical components of the catalyst in parts by weight are as follows: 30-40 parts of cerium oxide, 30-40 part of zirconia, 1-20 parts of other rare earth oxides and 1-5 parts of transition metal oxides, wherein the other rare earth oxides are lanthanum oxide, praseodymium oxide, neodymium oxide, yttrium oxide and samarium oxide and the transition metal oxides are vanadium oxide, chromium oxide, manganese oxide, ferric oxide, cobaltosic oxide and copper oxide. The invention further provides a preparation method of the catalyst. The preparation method comprises the following steps: mixing all the raw materials with a surfactant, adjusting the pH to 8-10 to obtain a gel-like deposition and calcining to obtain the product. According to the method, the doping defect caused during cerium-zirconium carrier doping is overcome; meanwhile, the thermal stability, aging specific area and oxygen storage amount of the carrier catalyst are improved; the invention also provides the preparation method which is simple in technique process and is favorable for large-scale industrial production.

Description

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

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.