Patent ID: 6608151
Filing Date: 2003-08-19
Classification: B01J,C08F

Abstract:
A method for producing supported chromium catalysts for the polymerization of olefins which comprises loading a xerogel support with chromium bya) adding to the xerogel support a volume of a 0.025 to 15% by weight solution of a chromium compound or a volume of a solution comprising from 0.025 to 7.8% by weight of Cr which is essentially converted into a chromium(VI) compound on heating in a water-free stream of gas under oxidizing conditions at temperatures in the range from 300 to 1100Â° C. for a period of from 10 to 1000 minutes in a solvent which comprises a maximum of 20% by weight of water, and subsequently b) evaporating the solvent, and wherein the volume of the chromium salt solution employed is smaller than the pore volume of the xerogel support.