Patent ID: 8076262

Claim:
A supported chromium catalyst comprising: (i) an activated chromium catalyst, wherein said activated chromium catalyst consists essentially of: chromium oxide, and a silica-containing support comprising silica selected from the group consisting of silica having: (a) a pore volume of about 1.1-1.8 cm 3 /g and a surface area of about 245-375 m 2 /g; (b) a pore volume of about 2.4-3.7 cm 3 /g and a surface area of about 410-620 m 2 /g; and (c) a pore volume of about 0.9-1.4 cm 3 /g and a surface area of about 390-590 m 2 /g; and (ii) an alkyl silanol, and (iii) an organoaluminum compound, wherein said activated chromium catalyst is obtained by activating a chromium catalyst at 400-860° C. prior to the addition of said alkyl silanol; and wherein the activated chromium catalyst is treated first with said alkyl silanol and then with said organoaluminum compound.