采用反相微乳液法制备了在高温条件下结构稳定的Al2O3基复合氧化物.经BET 比表面积和XRD测定表明,用本方法制备的Al2O3、钡改性Al2O3、硅改性Al2O3都具有很高的热稳定性,经1100℃焙烧10h后,Al2O3的比表面积为51m2·g-1,钡改性Al2O3的比表面积为90m2·g-1,硅改性Al2O3的比表面积为175m2·g-1,远高于用sol-gel法制备的同组成的样品.制备方法不同,所得产物的物相结构和孔径分布也存在较大的差异,用反相微乳液法制备的样品主要以活性Al2O3相存在,粒度分布均匀,为纳米级粒子.钡和硅的存在提高了活性Al2O3的相转变温度,抑制了高温条件下粒子的长大,从而使样品的热稳定性提高.
High thermal-stable alumina-substrate materials were prepared by the reverse microemulsion method and characterized by XRD, nitrogen
adsorption at low temperature, TEM and so on. The results indicate that the samples prepared by the reverse microemulsion method have
higher thermal stability. After calcination at 1100℃ for 10h, the surface area of alumina, Ba-doped alumina and Si-doped alumina is
51, 90 and 175m2·g-1 respectively, which is much higher than that of the same samples prepared by the sol-gel method. Besides this, the phase structures and the pore diameter distribution of the sample
derived from the reverse microemulsion method are also more different to those of the sample derived from the sol-gel method. The former
shows transition alumina structure and uniform nanometer particles even calcined at 1100℃ for 10h. The presence of Ba or Si can
increase the phase transformation temperature of alumina and restrict its grain growth at high temperature.
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