High pore volume, high purity alumina gels containing a chromium catalyst
AssigneeNational Petro Chemicals Corporation
InventorsAnthony N. Speca, Roger D. Laib
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Abstract
Novel high pore volume, high purity alumina gels and catalysts prepared therefrom are provided by a unique alumina gel preparation comprising hydrolyzing an aluminum alcoholate in a medium of a mixture of water and acetone aging the resultant product and thereafter washing with acetone. Processes for the polymerization of olefins utilizing the afore-described alumina gels are also included herein.
Claims3
A catalyst system useful for the preparation of low molecular weight polyolefins comprising an alumina gel support material having an interparticle nitrogen pore volume of at least 1.4 to 1.8 cc/g and a surface area of 428 to 496 m.sup.2 /g and a chromium containing compound deposited on said alumina gel support, said alumina gel support material being prepared by a process comprising the steps of:
- (i) hydrolyzing an aluminum alcoholate in a hydrolyzing medium comprised of a mixture of water and acetone having an H.sub.2 O/Al ratio of from about 15:1 to about 26:1;
- (ii) aging the product of step (i) for about 4 hours to about 24 hours;
- (iii) washing the resultant aged product from step (ii) with acetone;
- and
- (iv) drying the product from step (iii).
Dependencies are inferred from the claim text.