A Novel Method for Preparing γ-Al_2O_3
Journal of Xiamen University(2003)
摘要
A novel method for preparingγAl2O3 is provided with the procedure as follows :(1) a mixing solution composed of AlCl3,NH+4,H2O 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 NH4Cl 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 γAl2O3 obtained by the method is characterized by large pore volume,narrow pore distribution and high crushing strength for pellet.
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