Method for preparing high-thermal-stability cerium-based oxygen storage material

A technology of high thermal stability and oxygen storage materials, applied in separation methods, chemical instruments and methods, catalyst activation/preparation, etc., can solve problems such as low specific surface area, decreased oxygen storage/release capacity, poor thermal stability of structure and texture, etc. problem, to avoid agglomeration and growth, weaken the interaction force, and reduce the effect of surface tension
CN101690890AInactive Publication Date: 2010-04-07CHINA NAT OFFSHORE OIL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA NAT OFFSHORE OIL CORP
Publication Date
2010-04-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for preparing a high-thermal-stability cerium-based oxygen storage material, which is characterized in that the cerium-based oxygen storage material comprises cerium dioxide, zirconium dioxide, aluminum oxide in a small amount and at least one rare-earth crystal stabilizer selected from lanthanum oxide, praseodymium oxide, yttrium oxide and terbium oxide. The method comprises the following steps in the preparation process: adding a proper amount of surfactant, to obtain a cerium-based composite oxide material having the characteristics of single crystalline phase, high oxygen storage performance and high specific surface area; and ageing the cerium-based composite oxide material at a high temperature (1,050 DEG C) for 5h until the specific surface area thereof is higher than 35m<2> / g and the oxygen storage capacity thereof is higher than 400 mu mol / g. According to the phase results, the cerium-based oxygen storage material has a uniform-phase structure, moreover, a uniform solid solution with a cubic fluorite structure can be prepared from zirconium dioxide, aluminum oxide, stabilizer and cerium dioxide. The preparation process of the oxygen storage material has the characteristics of simple process, lower production cost, easy industrial scale-up, etc.
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Description

[0001] Involved areas

[0002] The invention relates to the technical field of rare earth oxygen storage materials; more precisely, it relates to an oxygen storage material technology of an automobile exhaust purification catalyst, and is a preparation method of a high thermal stability cerium-based oxygen storage material. Background technique

[0003] With the increasingly prominent problem of air pollution in my country's cities, people are paying more and more attention to vehicle emission pollution. The World Health Organization (WHO) and many countries (regions) have adopted air quality standards to control the content of major pollutants in the atmosphere. , to protect the public and the ecological environment. 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 c...

Claims

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