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Compositions based on cerium oxide and zirconium oxide with high specific surface area and high oxygen storage capacity, process for their preparation and use in catalytic reactions
Compositions based on cerium oxide and zirconium oxide with high specific surface area and high oxygen storage capacity, process for their preparation and use in catalytic reactions
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机译:具有高比表面积和高储氧能力的基于氧化铈和氧化锆的组合物,其制备方法和用于催化反应的方法
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摘要
A composition based on cerium oxide and on zirconium oxide and, optionally, on a yttrium, scandium or rare-earth metal oxide. The cerium/zirconium atomic proportion is at least 1. The compound exhibits a specific surface, after calcination for 6 hours at 900° C. of at least 35 m2/g and an oxygen storage capacity at 400° C. of at least 1.5 ml of O2/g. The composition is prepared by mixing, in a liquid medium, a cerium compound, a zirconium compound and, if appropriate, a yttrium, scandium or rare-earth metal compound; heating and calcining the precipitate obtained; and using a zirconium solution having an amount of base necessary to reach the equivalent point during an acid/base titration of the solution having a molar ratio of OH-/Zr=1.65. The composition thus obtained is used in the manufacture of multi-functional catalysts.
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