CATALYSTS

摘要

A method of preparing a modified catalyst support comprises preparing a titanium- containing catalyst support material by (i) contacting a catalyst support material with an organic titanium compound, or (ii) co-hydrolysing a hydrolysable organic titanium compound and AI(OR")3, with the titanium-containing catalyst support material then including Al, wherein all R" are the same or different and are each an organic group. The titanium-containing catalyst support material is calcined at a temperature above 900°C to obtain a modified catalyst support which includes more than 1 wt% and less than 3.5 wt% Ti, based on the mass of the catalyst support material in the modified catalyst support, the Ti being present in the form of one or more titanium compounds.