Modified catalyst supports

摘要

A process for preparing a supported catalyst system comprising the following steps:
a. titanating a silica-containing catalyst support having a specific surface area of from 150 m2/g to 800 m2/g, preferably 280 to 600 m2/g, with at least one vaporized titanium compound of the general formula selected from RnTi(OR′)m and (RO)nTi(OR′)m, wherein R and R′ are the same or different and are selected from hydrocarbyl groups containing from 1 to 12 carbon and halogens, and wherein n is 0 to 4, m is 0 to 4 and m+n equals 4, to form a titanated silica-containing catalyst support having at least 0.1 wt % of Ti based on the weight of the titanated silica-containing catalyst support,b. treating the support with a catalyst activating agent, preferably an alumoxane.c. treating the titanated support with at least one metallocene during or after step (b).

主权项

1. A process for preparing a supported catalyst system comprising:
a. titanating a silica-containing catalyst support having a specific surface area of from 150 m2/g to 800 m2/g with at least one vapourised titanium compound to form a titanated silica-containing catalyst support having at least 0.1 wt % of Ti based on a weight of the titanated silica-containing catalyst support; b. treating the titanated silica-containing catalyst support with a catalyst activating agent; and c. treating the titanated silica-containing catalyst support with at least one metallocene during or after step (b); wherein the at least one vapourised titanium compound is selected from a group consisting of tetraalkoxides of titanium having the general formula Ti(OR′)4, wherein each R is the same or different and is an alkyl group having from 3 to 5 carbon atoms, a cycloalkyl group having from 3 to 5 carbon atoms, or a mixture thereof.