| abstract |
The composition of the invention is based on zirconium oxide comprising 1% to 20% of yttrium oxide, 1% to 30% of tungsten oxide and the balance of zirconium oxide. This composition may have a specific surface area of at least 40 m 2 / g after calcination at 700 ° C. for 4 hours and an acidity measured by the methylbutynol test of at least 90%. The composition may be used as catalyst or catalyst support, especially for the treatment of motor vehicle exhaust gases. |