| abstract |
The compositions of the present invention are based on zirconium oxide and contain 1% to 20% yttrium oxide, 1% to 30% tungsten oxide and the balance zirconium oxide. The composition can have a specific surface area of at least 40 m 2 / g after baking for 4 hours at 700 ° C. and an acidity of at least 90% as measured by the methylbutinol test. The composition can be used as a catalyst or catalyst support, in particular for the treatment of automobile exhaust gases. |