| 摘要 |
A catalyst is formed by combining a support material with (1) a chromium-containing compound such as chromium trioxide and (2) at least one of a gallium-containing compound such as gallium isopropoxide, and a tin-containing compound such as tin isopropoxide, and then activating the catalyst by heating at a temperature of at least 1,700 DEG F. Polymers such as polyethylene formed using the catalyst of this invention have a narrow molecular weight distribution.
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