| abstract |
The compositions of the present invention is essentially at least 15%, has a ratio of the oxides of lanthanum oxide and other rare earth, 10 hours at 4 hours and 1150 ° C. at 1000 ° C., at least 40m after calcination, respectively 2 / g and another rare earth oxide selected from zirconium, cerium and lanthanum and yttrium, gadolinium and samarium having a specific surface area of at least 15 m 2 / g. The composition has a surface area of at least 7 m 2 / g after calcination at 1200 ° C. for 10 hours. This surface area is at least 5 m 2 / g in embodiments where the composition is in the form of a pure solid solution after 10 hours of calcination at 1150 ° C. The composition can be used as a catalyst or catalyst support. |