Cerium oxide and zirconium oxide based sosoloid catalyst, preparation method and application thereof

Abstract

The invention relates to a catalytic material for purifying tail gas of an automobile, in particular to a cerium oxide and zirconium oxide based sosoloid catalyst, a preparation method and application thereof. The cerium oxide and zirconium oxide based sosoloid catalyst comprises 50-79.5wt% of zirconium oxide, 20-49.5wt% of cerium oxide and 0.5-25wt% of oxides of other elements, wherein the zirconium oxide, the cerium oxide and the oxides of other elements is present in a sosoloid form, and the oxides of other elements are one or more oxides of lanthanons except cerium. The preparation method is as follows: continuous coprecipitation is carried out on zirconium oxychloride, saline solution of cerium and saline solution of lanthanons except cerium to obtain the cerium oxide and zirconium oxide based sosoloid catalyst. In the invention, by adding the zirconium oxide and the oxides of the lanthanons except cerium, the prepared cerium oxide and zirconium oxide based sosoloid catalyst has favorable catalytic performance and greatly improved thermal stability. The preparation method can prepare the cerium oxide and zirconium oxide based sosoloid catalyst under relatively lower temperature and normal pressure.

Description

technical field [0001] The invention relates to a catalytic material for purifying automobile exhaust, in particular to a cerium oxide zirconium-based solid solution catalyst, a preparation method and application thereof. Background technique [0002] At present, automobile exhaust purification catalyst is the most effective means to control automobile emission and reduce automobile pollution. Mainly use precious metals and add rare earth elements to form catalysts. Usually, precious metal catalysts mainly use platinum, palladium, etc. as catalysts, which have the advantages of high activity, long life, and good purification effect, and are very practical. The rare earth is mainly cerium oxide. Due to the redox characteristics of cerium oxide, it can effectively control the components of the exhaust gas, and can supply oxygen in a reducing atmosphere or consume oxygen in an oxidizing atmosphere. The disadvantage of ceria is mainly the lack of thermal stability. The therma...

AI Technical Summary

Problems solved by technology

The disadvantage of ceria is mainly the lack of thermal stability. The thermal stability of ceria can be improved by adding other element oxides such as zirconia and yttrium oxide to ceria. Therefore, ceria-zirconium-based solid solution Practically a solid solution of ceria and z