COMPOSITION BASED ON OXIDES OF ZIRCONIUM, OF CERIUM, OF AT LEAST ONE RARE EARTH OTHER THAN CERIUM AND OF SILICON, PREPARATION PROCESSES AND USE IN CATALYSIS

摘要

The composition according to the invention is based on zirconium oxide, cerium oxide and at least one oxide of a rare earth other than cerium, in a proportion, by weight, of zirconium oxide of at least 5% and of cerium oxide of at most 90%, and it is characterized in that it additionally comprises silicon oxide in an amount, by weight, of between 0.1% and 2%. This composition may be used in catalysis, in particular in systems for treating the exhaust gases of internal combustion engines.