abstract |
As a procatalyst composition, a) a silica support, wherein the amount of silica is in the range of about 70% by weight to about 95% by weight based on the total weight of the silica support, b) as a chromium-containing compound, the amount of chromium A chromium-containing compound, c) a titanium-containing compound, ranging from about 0.1% to about 5% by weight based on the amount of silica, wherein the amount of titanium is from about 0.1% to about 20% by weight based on the amount of silica. % Of a titanium-containing compound, d) a carboxylic acid, wherein the equivalent molar ratio of the titanium-containing compound to the carboxylic acid ranges from about 1:1 to about 1:10, and e) at least one A nitrogen-containing compound having a molecular formula containing a nitrogen atom, the procatalyst composition comprising a nitrogen-containing compound, wherein the equivalent molar ratio of the titanium-containing compound to the nitrogen-containing compound ranges from about 1:0.5 to about 1:10. . |