Dealuminised nu-86 zeolite and its use in the conversion of...

B - Operations – Transporting – 01 – J

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B01J 29/70 (2006.01) C01B 39/02 (2006.01) C07C 2/12 (2006.01) C07C 2/24 (2006.01)

Patent

CA 2271091

The invention concerns a NU-86 zeolite, containing silicon, and at least one element T selected from the group formed by aluminium, iron, gallium and boron, preferably aluminium, characterised in that the element T has been extracted from the structure and in that it has a global atomic Si/T greater than about 20. The extraction of the element T from the zeolite structure (or network) is effected by at least a thermal treatment. optionally carried out in the presence of water vapour, followed by at least an acid attack, by at least a mineral or organic acid solution, or by a direct acid attack. The invention also concerns a catalyst comprising said zeolite at least partly in acid form and the use of said catalyst in hydrocarbon conversion, in particular in the oligomerization of olefins.

L'invention concerne une zéolithe NU-86, comprenant du silicium, et au moins un élément T choisi dans le groupe formé par l'aluminium, le fer, le gallium, et le bore, de préférence l'aluminium, caractérisée en ce que de l'élément T a été extrait de la charpente et en ce qu'elle possède un Si/T atomique global supérieur à environ 20. L'extraction d'élément T de la charpente (ou réseau) zéolithique est effectuée par au moins un traitement thermique, réalisé éventuellement en présence de vapeur d'eau, suivi d'au moins une attaque acide, par au moins une solution d'un acide minéral ou organique, ou bien par une attaque acide directe. L'invention concerne aussi un catalyseur comprenant ladite zéolithe au moins en partie sous forme acide et l'utilisation dudit catalyseur en conversion d'hydrocarbures, en particulier en oligomérisation d'oléfines.

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