SC2 activation of supported chromium oxide catalysts

摘要

A method for producing activated catalysts in which a catalyst containing chromium on a silica-containing support is (1) contacted with a gaseous environment consisting essentially of sulfur dioxide and oxygen at a temperature in a range of about 450 DEG C. to about 1100 DEG C. for a time ranging from about one to about five hours and (2) subsequently maintaining a temperature within the contact temperature range while contacting the catalyst with a gaseous environment consisting essentially of oxygen and gases inert to reaction with the catalyst. In another embodiment of the invention the temperature for a succeeding step is not raised above that attained in the previous step. In an embodiment of the invention the catalyst is contacted with a gaseous environment consisting essentially of oxygen and gases inert to reaction with the catalyst while the temperature is being increased prior to contact with sulfur dioxide.