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采用浸渍法添加不同碱土金属元素对γAl2O3进行改性.通过BET、XRD等手段研究考察了在1373K空气中经不同时间处理γAl2O3的相变和烧结情况比较了各样品烧结后比表面积的差异.结果表明碱土金属的引入(尤其是Sr、Ca)有效地抑制了氧化铝比表面积的损失和α相变.并对Al2O3的烧结动力学进行了研究探讨研究表明铝酸盐的生成并不是稳定氧化铝的根本原因碱土金属的高温稳定作用主要是分散态的碱土金属氧化物抑制氧化铝焙烧过程中最初1h内的烧结和α相变引起的比表面积损失.
Addition of different alkaline earth elements by impregnation method to modify γ-Al2O3.The BET, XRD and other means to study the 1373K air at different times deal with the phase transformation and sintering of γ-Al2O3 After comparing the specific surface area of each sample after sintering The results show that the introduction of alkaline earth metals (especially Sr, Ca) effectively restrains the loss of specific surface area of alumina and the α transformation, and studies the sintering kinetics of Al 2 O 3. Is not the root cause of stable alumina High temperature stability of alkaline earth metal is mainly that the dispersed alkaline earth metal oxide suppresses the sintering and the specific surface area loss caused by α phase transformation in the first 1 hour during the calcination of alumina.