HIGHLY ACIDIC COMPOSITION CONTAINING ZIRCONIUM OXIDE, TITANIUM OXIDE AND TUNGSTEN OXIDE, METHOD FOR PREPARING THE SAME AND USE THEREOF IN THE TREATMENT OF EXHAUST GASES

摘要

The invention relates to a composition containing zirconium, titanium and tungsten oxides, and optionally the oxide of an element M selected from silicon, aluminium, iron, molybdenum, manganese, zinc, tin, and rare earths in the following mass proportions of said different elements: titanium oxide: 20%-50%; tungsten oxide: 1%-20%, M-element oxide: 1%-20%; the balance consisting of zirconium oxide. The composition is obtained by: placing in a liquid medium a zirconium compound, a titanium compound, optionally an M-element compound and a basic compound; adding a tungsten compound to the precipitate suspension thus obtained and having a pH value of between 1 and 7; maturing the suspension resulting from the preceding step; and optionally separating the precipitate and calcining it.