HIGHLY ACIDIC COMPOSITION CONTAINING ZIRCONIUM AND SILICON OXIDES AND AN OXIDE OF AT LEAST ONE ELEMEMENT SELECTED FROM TITANIUM, ALUMINIUM, TUNGSTEN, MOLYBDENUM, CERIUM, IRON, TIN, ZINC, ANDMANGANESE

摘要

The invention relates to a composition containing zirconium oxide, Silicon oxide and an oxide of an eiement M selected from titanium, aluminium, tungsien, molybdenum, cerium, iron, tin, zinc, and manganese, in the following mass proportions of said difTerent elements: Silicon oxide : 5%-30%; de M-element oxide : l%-20%; the balance consisting of zirconium oxide. The composition further has an acidity, as measured by the methylbutynol test, of at least 90 %. The composition can be prepared according to a method that involves placing a zirconium Compound, a Silicon Compound, an M-element Compound and a basic Compound in a liquid medium, thereby generating a precipitate; maturing said precipitate in a liquid medium; and separating and calcining the precipitate. The composition can be used for processing the exhaust gases of diesel engines.