| abstract |
Catalyst systems and methods for making and using them. One method of making a catalyst support includes forming a mixture of a support material and a fluoride donor. The mixture is added to a fluidized bed reactor. The mixture is fluidized to form a fluidized bed, while maintaining a flow rate of a fluidizing gas of about 0.1 ft/s at less than about 370°C and greater than about 0.35 ft/s at higher temperatures. than about 370°C. The mixture is calcined to decompose the fluoride donor, forming a fluorinated support. |