以正硅酸甲酯和硝酸铝为硅和铝的前驱体,以非离子表面活性剂C16EO10为结构导向剂,采用溶胶-凝胶法制备了双孔结构硅铝复合氧化物材料.扫描电镜和N2吸附/脱附分析表明,材料具有三维连续大孔和骨架介孔的双孔分布结构.微米范围的连续大孔结构是由于溶胶-凝胶过程中诱发了Spinodal相分离所致,而骨架介孔的形成则可能是由于表面活性剂分子进入凝胶骨架中,起到构建介孔结构的模板作用.骨架元素分析结果表明,制备过程中添加的铝大部分进入了凝胶骨架中,取代部分硅而形成酸性硅铝复合氧化物采用Hammett指示剂法和吡啶吸附红外光谱法分析了材料的表面固体酸性,结果显示,硅铝复合氧化物属于中强酸,酸强度H0在-5.6~-3.0之间的酸中心数约为0.35 mmol/g,并且材料表面的L酸位较为丰富,B酸位相对较少.
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