Methods for making supported chromium catalysts with increased polymerization activity

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United States of America

PATENT NO 12157109
APP PUB NO 20230285940A1
SERIAL NO

18311279

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Abstract

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Methods for making a supported chromium catalyst are disclosed, and can comprise contacting a silica-coated alumina containing at least 30 wt. % silica with a chromium-containing compound in a liquid, drying, and calcining in an oxidizing atmosphere at a peak temperature of at least 650° C. to form the supported chromium catalyst. The supported chromium catalyst can contain from 0.01 to 20 wt. % chromium, and typically can have a pore volume from 0.5 to 2 mL/g and a BET surface area from 275 to 550 m2/g. The supported chromium catalyst subsequently can be used to polymerize olefins to produce, for example, ethylene-based homopolymers and copolymers having high molecular weights and broad molecular weight distributions.

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Patent Owner(s)

Patent OwnerAddress
CHEVRON PHILLIPS CHEMICAL COMPANY LP10001 SIX PINES DRIVE THE WOODLANDS TX 77380

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Clear, Kathy S Bartlesville, US 110 819
McDaniel, Max P Bartlesville, US 560 19791

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