COMPOSITION BASED ON ZIRCONIUM OXIDE AND ON AT LEAST ONE OXIDE OF A RARE EARTH OTHER THAN CERIUM, HAVING A SPECIFIC POROSITY, PROCESSES FOR PREPARING SAME AND USE THEREOF IN CATALYSIS

摘要

The composition of the invention is based on zirconium oxide and at least one oxide of a rare earth other than cerium, in a mass proportion of zirconium oxide of at least 50%, and it is characterized in that, after calcination at a temperature of 900 ° C for 4 hours, two pore populations whose respective diameters are centered, for the first, around a value of between 20 and 40 nm and, for the first time, second, around a value between 80 nm and 200 nm. The composition can be used for the treatment of the exhaust gases of internal combustion engines.