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
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Example Embodiment
[0033] Embodiment 1,
[0034] The preparation composition is 80% of cerium oxide, 10% of zirconium oxide, 5% of aluminum oxide and 5% of lanthanum oxide. Calculate and weigh the required amounts of cerium carbonate, zirconium oxycarbonate and aluminum nitrate according to the composition, put cerium carbonate, zirconium oxycarbonate and aluminum nitrate in a container, add 65% concentrated nitric acid, and add an appropriate amount of deionized water after complete dissolution , and mixed with cetyltrimethylamine bromide solution (the dosage is 80% of the total oxide), which is marked as solution 1. 25 wt% ammonia water was diluted and labeled as solution 2. Mix solution 1 and solution 2, and adjust the pH 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 BET method is 112m 2 / g, the oxygen storage capacity is 505μmol / g; the thermal stability was evaluat...
Example Embodiment
[0035] Embodiment 2,
[0036] A composite oxide with a composition of 70% ceria, 15% zirconia, 10% alumina and 5% lanthanum oxide was prepared, and the specific preparation method was the same as the method 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 118 m 2 / g, the oxygen storage capacity is 515μmol / g; the specific surface area of the aged sample is 39m 2 / g, and the oxygen storage capacity is 410 μmol / g.
Example Embodiment
[0037] Embodiment 3,
[0038] A composite oxide with a composition of 70% ceria, 15% zirconia, 10% alumina and 5% lanthanum oxide was prepared, and the specific preparation method was the same as the method 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 118 m 2 / g, the oxygen storage capacity is 515μmol / g; the specific surface area of the aged sample is 39m 2 / g, and the oxygen storage capacity is 410 μmol / g.
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