Patent attributes
A method comprising calcining a catalyst precursor comprising chromium and a silica support material at a temperature in the range of from about 95° C. to about 400° C. in a bed fluidized by a gas flowing at a volumetric flow rate of from about 2.5 to about 30 times the settled volume of the bed per minute to form a calcined catalyst precursor. A method comprising calcining a catalyst precursor comprising chromium and silica at a temperature in the range of from about 95° C. to about 400° C. with a gas flowing through the bed at a gas hourly space velocity of from about 15 to about 200 per hour. A method comprising calcining a catalyst precursor comprising chromium and silica at a temperature in the range of from about 95° C. to about 400° C. with a gas flowing through the bed at a weight hourly space velocity of from about 1.9 to about 240 per hour.
