摘要 |
<p>The invention relates to a composition that contains zirconium oxide, cerium oxide and yttrium oxide, or zirconium oxide, cerium oxide and at least two oxides of two rare earths different from cerium in a mass proportion of at least 20 % of zirconium oxide and of at most 70 % of cerium oxide, characterized in that said composition comprises, after calcination at 900°C for 4 hours, two populations of pores having respective diameters centered, for the first population, about a value of between 20 and 40 nm and, for the second, about a value of between 80 and 200 nm. The composition can be used for processing exhaust gases of internal combustion engines.</p> |