A Novel Method for Preparing γ-Al_2O_3

A novel method for preparingγAl2O3 is provided with the procedure as follows :(1) a mixing solution composed of AlCl3,NH+4,H2O and ammonium oxalate is concentrated by heating and resulting in the deposition of Al(OH)3;(2)drying the deposit;(3)decomposing the deposit and NH4Cl being retrieved;(4)the powder from step(3)being pelleliged(5)calcining the pellet at 550℃ for 4hr.Compared with the usual technology,this new method has the advantages of needlessness of preparing steps such as aging,filter and washing,and the dispose of the washing liquid.The γAl2O3 obtained by the method is characterized by large pore volume,narrow pore distribution and high crushing strength for pellet.