Nano cerium zirconium sosoloid and preparation thereof

Abstract

The invention provides a nano ceria-zirconia solid solution and a method of preparing the solution. The chemical general formula of the nano ceria-zirconia solid solution is Ce1-XZrO2, wherein, X is 0.05 to 0.95. Compared with the prior art, the nano ceria-zirconia solid solution of the invention is characterized by small grain size, large specific surface area, high oxygen storage, high oxygen storage and release speed, and strong sintering resistant capability.

Description

technical field [0001] The invention relates to a nanometer cerium-zirconium solid solution and a preparation method thereof. Background technique [0002] Energy and the environment are the most important issues involved in the sustainable development of human society. With the depletion of petroleum resources and the increasing environmental pollution, my country's standards and requirements for automobile exhaust emissions are getting higher and higher. Three-way catalysts for automobile exhaust It is a multi-component composite catalyst, which mainly eliminates carbon monoxide, nitrogen oxides and hydrocarbons at the same time. [0003] At present, the commonly used cocatalyst to improve the activity, selectivity and stability of the catalyst is cerium-zirconium solid solution, which has multiple functions: (1) store and release oxygen, so that the catalyst can better oxidize carbon monoxide and hydrocarbons in an oxygen-poor state compounds, and better reduction of nitr...

AI Technical Summary

Problems solved by technology

[0004] The cerium-zirconium solid solution prepared by the commonly used technology and process has the disadvantages of low oxygen storage capacity, slow oxygen storage and release rate, small specific surface area, and poor sintering resistance.

Therefore, the development of high-performance cerium-zirconium solid solution is the research focus of automobile exhaust treatment. According to literature and patent reports, the commonly used methods for preparing cerium-zirconium solid solution include coprecipitation method, sol-gel method, hydrothermal synthesis method, etc., but these The cerium-zirconium solid solutions prepared in the prior art generally have disadvantages such as relatively large particle size, small specific surface area, and low oxygen storage capacity.