Preparation method for oxygen-storage material with high thermal stability

Abstract

The invention relates to a preparation method for an oxygen-storage material with high thermal stability and belongs to the technical field of environment-friendly materials. The preparation method comprises the following steps: utilizing cyanuric acid and lanthanum, cerium and zirconium ions to form a complex, taking ammonium hydroxide and cyanuric acid in the complex as precipitants, adding hydrogen peroxide and polyethylene glycol, and calcining under a certain temperature, thereby acquiring the oxygen-storage material with high thermal stability. The cyanuric acid is an organic acid with ultralow molecular weight; a lanthanum cerium cyanurate heat stabilizer can be acquired after the cyanuric acid is combined with lanthanum and cerium ions; the particles of the stabilizer formed by combing the cyanuric acid with the complex of the lanthanum and cerium ions are ultrafine and the specific surface area is increased; due to the addition of polyethylene glycol in the invention, the specific surface area of the material is obviously increased, the high temperature thermal stability of carrier is improved and the oxygen storage capacity of the oxygen-storage material is enhanced; theammonium hydroxide and the cyanuric acid in the complex are taken as precipitants and are not remained in the catalyst, few impurities are carried by the formed sediment and metal ions are completelyprecipitated; the oxygen-storage material has excellent oxygen storage performance and better market prospect.

Description

technical field [0001] The invention relates to a preparation method of a highly thermally stable oxygen storage material, which belongs to the technical field of environmental protection materials. Background technique [0002] With the increasingly prominent problem of air pollution in my country's cities, vehicle emission pollution is attracting more and more attention. The World Health Organization and many countries have adopted air quality standards to control the content of major pollutants in the atmosphere to protect the public and the ecology. surroundings. In the past ten years, due to the rapid increase in the number of automobiles, the total amount of motor vehicle pollutant emissions in my country's major cities has exceeded that of similar-sized cities in developed countries. At the same time, due to the high concentration of urban traffic and population, the emission density of motor vehicle pollutants and the concentration of pollutants caused by them are se...

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a highly thermally stable oxygen storage material for the problem that the structure and texture of the oxygen storage material have poor thermal stability and low specific surface area at high temperature, resulting in a decrease in its oxygen storage / release capacity. Material preparation method

Images