PROCESS FOR PRODUCING PHILLIPS CATALYSTS

摘要

Process for producing chromium catalysts, comprising the steps of: a) applying one or more chromium compound(s) to a finely divided inorganic support to form a catalyst precursor; b) thermally treating the catalyst precursor, the step of thermally treating the catalyst precursor being carried out for at least part of the time in an oxidizing atmosphere and in such a manner that a maximum temperature of from 350°C to 1050°C is not exceeded. The duration of the thermal treatment step at a temperature of above 300°C is, according to the invention, at least 1500 minutes.