HEAT-RESISTANT TRANSITION ALUMINA AND ITS PRODUCTION

摘要

PURPOSE:To decrease the reduction of specific surface area and to decrease the production cost by using a mixture of aluminum sulfate and barium compd. each by specified pts.wt. expressed in terms of alumina and barium, respectively. CONSTITUTION:The mixture of aluminum sulfate and barium compd. is a mixture soln. comprising 100 pts.wt. of alumina and 1-20 pts.wt. of barium, or a mixture containing water by the amt. 20 or more hydrates expressed in terms of crystalline water of aluminum sulfate. This mixture is heated and thermally decomposed. The obtd. transition alumina thus obtd. has >=60m<2>/g BET specific surface area after calcined at 1200 deg.C for 3 hours and excellent heat resistance.