COMPOSITION BASED ON OXIDES OF ZIRCONIUM, CERIUM, YTTRIUM, LANTHANUM AND OF ANOTHER RARE EARTH,

文件类型：PDF文档
文件大小：411K
The invention concerns a composition based on zirconium oxide in a weight proportion of at least 25%%, and comprising between 15%% and 60%% of cerium oxide, between 10%% and 25%% of yttrium oxide, between 2%% and 10%% of lanthanum oxide and between 2%% and 15%% of another rare earth oxide. Additionally, it has, after calcination for 10 hours at 1150°C, a specific surface of at least 15 m2/g as well as a cubic phase. It is obtained by forming a mixture comprising zirconium, cerium, yttrium, lanthanum and the additional rare earth, by precipitating said mixture with a base, heating in aqueous medium said precipitate, adding thereto a surfactant and calcining the precipitate. Said composition can be used as catalyst.© KIPO & WIPO 2009