COMPOSITION BASED ON ZIRCONIUM OXIDE, YTTRIUM OXIDE AND TUNGSTEN OXIDE, METHOD OF PREPARATION AND USE AS CATALYST OR CATALYST SUPPORT

摘要

The composition of the invention is based on zirconium oxide, which comprises 1 to 20% yttrium oxide, 1 to 30% tungsten oxide and the balance zirconium oxide. This composition may have a specific surface area of at least 40 m2/g after calcination at 700oC for 4 hours and an acidity measured by the methylbutynol test of at least 90%. The composition may be used as a catalyst or catalyst support, especially for the treatment of motor vehicle exhaust gases.