Reduction and reoxidation of cogel or self-reduced catalyst

Details Reduction and reoxidation of cogel or self-reduced catalyst Reduction and reoxidation of cogel or self-reduced catalyst

C - Chemistry, Metallurgy

08

F

252/103, 402/631

C08F 4/22 (2006.01) B01J 23/26 (2006.01) B01J 37/02 (2006.01) B01J 37/12 (2006.01) C08F 10/00 (2006.01)

Patent

CA 1125734

26413 REDUCTION AND REOXIDATION OF COGEL OR SELF-REDUCED CATALYST Abstract of the Disclosure High melt flow olefin polymers suitable for such applications as injection molding, and the like requiring a narrow molecular weight distri- bution are produced using a catalyst made by reducing and reoxidizing a chromiun catalyst on either a titanium-silica cogel or a self-reduced silica- containing composition. In the first embodiment, a cogel fromed by copre- cipitsting silics and titania, and containing a chromium compound, is treated in a nonoxidizing atmosphere, such as CO, hydrogen, N2 or a material decom- posable to these materials, and thereafter reoxidized. In the second embod- iment, a titanium-free chromium containing catalyst is first heated in air or the like to dry the catalyst and oxidized the chromium after which it is heated in an inert atmospere wherein the composition is self-reduced to give chromium in a lower valence state. The resulting self-reduced composition is then heated a reducing ambient and then reoxidized as in the first embodiment.

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