CATALYST CARRIERS, METHOD OF OBTAINING A GEL SERVING AS PRECURSOR OF SUCH CATALYST CARRIERS, METHOD OF OBTAINING A CATALYST CARRIER, CATALYST FOR POLYMERISATION OF OLEFINS AND METHOD OF POLYMERISING OLEFINS IN PRESENCE OF SUCH CATALYST

摘要

Process for the manufacture of a support containing silica and at least one constituent chosen from alumina and aluminum phosphate, according to which an alcohol, water, a silicon alkoxide and an acid are mixed under conditions such that gelling or precipitation of silica is prevented, an acidic solution of an aluminum compound and/or a solution of a source of phosphate ions are added thereto, a gelling agent is added thereto, a gel is recovered which is washed with water and then by means of an organic liquid, the gel is then dried by atomization until a powder is obtained, and the powder is calcined. Polymerization of olefins in the presence of a catalyst containing chromium on a support as described above.