A variety of modified Phillips catalysts were synthesized by employing three kinds of chemical modifiers for silica support: (1) organic modification with silane coupling agents, (2) Lewis acidic modification with typical metal alkyl or alkoxide, and (3) modification with transition-metal alkoxide. The activity and branching ability of these catalysts were investigated for ethylene polymerization. It was revealed that the chemical modification of silica support was a good methodology for controlling the catalyst activity as well as the branching level in resultant polyethylene.
Influence of Metal‐Alkyls on Early‐Stage Ethylene Polymerization over a Cr/SiO
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Phillips Catalyst: A Bulk Characterization and X‐ray Chemical Imaging Study