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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

Inactive Publication Date: 2010-04-07
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the main problems faced by cerium-based oxygen storage materials at present are poor thermal stability of structure and texture at high temperature, and low specific surface area, resulting in a decrease in their oxygen storage / release capacity; while specific surface area, pore volume, and average pore diameter, etc. Texture performance is an important index to measure the performance of catalytic materials, especially the carrier of automobile exhaust purification catalysts used at high space velocity and high temperature (sometimes above 1000°C), requires high specific surface area, suitable Pore ​​volume and pore size distribution

Method used

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

Examples

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Embodiment 1

[0034] A composite oxide with a composition of 80% of cerium oxide, 10% of zirconia, 5% of aluminum oxide and 5% of lanthanum oxide was prepared. Calculate and weigh the required amount of cerium carbonate, zirconium carbonate and aluminum nitrate according to the composition, put the cerium carbonate, zirconium carbonate and aluminum nitrate in the container, add 65% concentrated nitric acid, and add an appropriate amount of deionized water after completely dissolving , and mixed with hexadecyltrimethylammonium bromide solution (amount of 80% of the total amount of oxides), marked as solution 1. 25 wt% ammonia was diluted and labeled solution 2. Mix solution 1 and solution 2, and adjust the pH value to about 11; then age at 90°C for 48 hours; filter and wash, dry at 110°C in air, and then calcinate at 600°C for 3 hours After that, the specific surface area measured by the BET method is 112m 2 / g, the oxygen storage capacity is 505μmol / g; after calcination at 1050℃ for 5 hou...

Embodiment 2

[0036] A composite oxide with a composition of 70% cerium oxide, 15% zirconium oxide, 10% aluminum oxide and 5% lanthanum oxide was prepared, and the specific preparation method was the same as that in Example 1 of this part. The difference is that the pH of the reaction is 9, and the aging temperature is room temperature. After calcination at 700°C for 2 hours, the specific surface area of ​​the fresh sample of the obtained cerium-based oxygen storage material is 118m 2 / g, the oxygen storage capacity is 515μmol / g; the specific surface area of ​​the sample after aging is 39m 2 / g, the oxygen storage capacity is 410μmol / g.

Embodiment 3

[0038] A composite oxide with a composition of 70% cerium oxide, 15% zirconium oxide, 10% aluminum oxide and 5% lanthanum oxide was prepared, and the specific preparation method was the same as that in Example 1 of this part. The difference is that the pH of the reaction is 9, and the aging temperature is room temperature. After calcination at 500°C for 4 hours, the specific surface area of ​​the fresh sample of the obtained cerium-based oxygen storage material is 118m 2 / g, the oxygen storage capacity is 515μmol / g; the specific surface area of ​​the sample after aging is 39m 2 / g, the oxygen storage capacity is 410μmol / g.

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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.

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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Application Information

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IPC IPC(8): B01J23/10B01J37/03B01D53/94
Inventor 吴群英肖彦张燕郭子峰王林江
Owner CHINA NAT OFFSHORE OIL CORP
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