Al2O3扩孔条件的优化及材料性能  

Properties and Structure of Al_2O_3 with Large Pore

作　　者：李凝[1] 王强 王鹏[1] 

机构地区：[1]桂林工学院材料与化学工程系,广西桂林541004 [2]江西有色测试中心,南昌330201

出　　处：《桂林工学院学报》2008年第1期78-81,共4页Journal of Guilin University of Technology

基　　金：广西科学基金资助项目(桂科自0728217);广西科学研究与技术开发计划资助项目(桂科攻0630004-1D)

摘　　要：以硝酸铝为原料,用溶胶-凝胶法制备了具有较大孔径的Al2O3。用正交试验得出了制备较大孔径Al2O3的最佳试验条件:pH=10、表面活性剂的用量为3%、扩孔剂(聚乙二醇-20000)用量为8%,陈化温度为80℃、微波干燥。探讨了焙烧温度对Al2O3的表面积、孔径分布和晶相结构的影响。结果表明:900℃焙烧的Al2O3表面积为148.6 m2/g,大于20 nm的孔体积占总孔容的81%,Al2O3的晶相主要为γ-AlO,约占91.8%。Al2O3 with large pores was prepared by sol-gel method using Al（ NO3 ）3 as raw material. Optimal experimental parameters are determined by orthogonal experiments as following： pH = 10, 3% surfactant, pore enlarger （PEG-20000） 8%, aging temperature 80 ℃, microwave drying. The influence of calcination temperature on the specific surface, pore size distribution and crystal structure is studied, and shows that the Al2O3 calcinated at 900℃ has a specific surface of 148.6 m^2/g, a distribution of pores with 81% of them above 20 nm, and 91% γ-Al2O3.

关 键 词：溶胶-凝胶法 微波干燥 AL2O3 

分 类 号：TQ426.94[化学工程] TB303[一般工业技术—材料科学与工程]