Highly acidic composition containing zirconium oxide,...

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B01J 21/06 (2006.01) B01D 53/94 (2006.01) B01J 23/30 (2006.01) B01J 37/02 (2006.01) C01B 13/00 (2006.01) C01G 23/04 (2006.01) C01G 25/02 (2006.01) C01G 41/02 (2006.01)

Patent

CA 2666626

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.

La composition de l'invention est à base d'oxydes de zirconium, de titane et tungstène et éventuellement d'un élément M choisi parmi le silicium, l'aluminium, le fer, le molybdène, le manganèse, le zinc, l'étain et les terres rares dans les proportions suivantes en masse en ces différents éléments: oxyde de titane: 20%-50%, oxyde de tungstène: 1%-20%, oxyde de l'élément M: 1%-20%, le complément en oxyde de zirconium. Cette composition est obtenue en mettant en présence dans un milieu liquide des composés du zirconium, du titane, éventuellement de l'élément M et un composé basique; en ajoutant un composé du tungstène à la suspension du précipité ainsi obtenue et dont la valeur du pH est ajustée entre 1 et 7; en effectuant un mûrissement de la suspension issue de l'étape précédente; en séparant éventuellement le précipité et en le calcinant.

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