Catalyst support, method for making a precursor gel for a...

C - Chemistry – Metallurgy – 08 – F

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C08F 4/02 (2006.01) B01J 21/12 (2006.01) B01J 27/16 (2006.01) B01J 35/10 (2006.01) B01J 37/03 (2006.01) C08F 4/78 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2163119

Catalyst support containing at least two components chosen among silica, alumina and aluminium phosphate, with a specific surface of 100 to 800 m<2>/g, a crystallization temperature higher or equal to 700 DEG C, a pore volume of 1.5 to 4 cm<3>/g, and the relationship between the specific surface (SS) and pore volume (PV) being: SS < (VP x 564 - 358). Process for making such a support, comprising mixing an alcohol, water and a silicon alcoholate and an acid in such conditions that the gelification or precipitation of the silica is avoided, adding an acid solution of an aluminium compound and/or a solution of a phosphate ion source, adding a gelling agent, collecting a gel which is washed with water and then with an organic liquid, drying thereafter the gel until a powder is formed, this powder being then calcined. Olefin polymerization in the presence of a chromium-containing catalyst on the afore-mentioned support.

Support pour catalyseurs, contenant au moins deux constituants choisis parmi la silice, l'alumine et le phosphate d'aluminium, présentant une surface spécifique de 100 à 800 m2/g, une températuer de cristallisation supérieure ou égale à 700 °C, un volume poreux de 1,5 à 4 cm3/g, la surface spécifique (SS) et le volume poreux (VP) répondant à la relation: SS < (VP x 564 - 358). Procédé pour la fabrication d'un tel support, selon lequel on mélange un alcool, de l'eau, un alcoolate de silicium et un acide dans des conditions telles qu'on évite une gélification ou précipitation de silice, on y ajoute une solution acide d'un composé d'aluminium et/ou une solution d'une source d'ions phosphates, on y ajoute un agent gélifiant, on recueille un gel que l'on soumet à un lavage à l'eau et ensuite au moyen d'un liquide organique, puis on sèche le gel jusqu'à l'obtention d'une poudre, et on calcine la poudre. Polymérisation d'oléfines en présence d'un catalyseur contenant du chrome sur un support tel que décrit ci-dessus.

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