a catalyst is produced by contacting an already activated silica - titania supported chromium composition with a tertiary alcohol and thereafter reactivating under relatively mild conditions . such contacting is conveniently carried out by forming a slurry of the catalyst in an inert diluent containing a small amount of the alcohol . the resulting catalyst is useful in olefin polymerization . in such polymerization operations , the catalyst offers the advantage of allowing polymerization at a lower reactor temperature to achieve a given melt flow .