溶胶-凝胶法制备钇修饰氧化铝载体的热稳定性研究  

Study on Thermal Stability of Alumina Modified with Yttrium Prepared by Sol-gel Method

作　　者：田久英[1] 卢菊生[1] 吴宏[1] 沐来龙[1] 

机构地区：[1]徐州师范大学化学化工学院,江苏徐州221116

出　　处：《稀土》2010年第1期30-34,共5页Chinese Rare Earths

基　　金：徐州师范大学自然科学基金(07XLA06);江苏省高校自然科学基金(07KJB150112)

摘　　要：利用柠檬酸为配体的溶胶-凝胶法制备钇修饰的氧化铝样品,并通过XRD,BET等测试手段对氧化铝样品的物相组成、孔结构和热稳定性进行研究,结果表明钇的添加,抑制了介稳态氧化铝向热力学稳定态α-Al2O3的转变,提高了γ-Al2O3的相变温度,同时,降低了氧化铝的微孔烧结和比表面积下降的速度,从而提高了氧化铝的高温热稳定性。Alumina modified with rare earth element yttrium was prepared by sol-gel method,using citric acid as ligand.XRD and BET were used to study the constitute of phase,pore structure and thermal stability of alumina,the results show that the addition of rare earth element yttrium can delay the phase transformation from metastable phase alumina to corundum phase（α-Al2O3）,which is the most thermodynamically stable phase,improve the temperature of phase transformation,keep micro-pore of alumina from sintering,suppress the decrease of the surface area of alumina and enhance the thermal stability.

关 键 词：钇修饰 氧化铝载体 热稳定性 溶胶-凝胶法 

分 类 号：O643.3[理学—物理化学] O614.33[理学—化学]