Hartmann Sarah, Sachse Alexander, Galarneau Anne
Institut Charles Gerhardt Montpellier, UMR 5253 CNRS/UM2/ENSCM/UM1, ENSCM 8 Rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France.
Materials (Basel). 2012 Feb 20;5(2):336-349. doi: 10.3390/ma5020336.
A new rapid, very simple and one-step sol-gel strategy for the large-scale preparation of highly porous γ-Al₂O₃ is presented. The resulting mesoporous alumina materials feature high surface areas (400 m² g), large pore volumes (0.8 mL g) and the γ-Al₂O₃ phase is obtained at low temperature (500 °C). The main advantages and drawbacks of different preparations of mesoporous alumina materials exhibiting high specific surface areas and large pore volumes such as surfactant-nanostructured alumina, sol-gel methods and hierarchically macro-/mesoporous alumina monoliths have been analyzed and compared. The most reproducible synthesis of mesoporous alumina are given. Evaporation-Induced Self-Assembly (EISA) is the sole method to lead to nanostructured mesoporous alumina by direct templating, but it is a difficult method to scale-up. Alumina featuring macro- and mesoporosity in monolithic shape is a very promising material for in flow applications; an optimized synthesis is described.
本文提出了一种用于大规模制备高孔隙率γ-Al₂O₃的新型快速、极其简单的一步溶胶-凝胶策略。所得介孔氧化铝材料具有高比表面积（400 m²/g）、大孔容（0.8 mL/g），且γ-Al₂O₃相在低温（500°C）下获得。分析并比较了不同制备方法（如表面活性剂纳米结构氧化铝、溶胶-凝胶法和分级大孔/介孔氧化铝整体材料）制备具有高比表面积和大孔容的介孔氧化铝材料的主要优缺点。给出了最具可重复性的介孔氧化铝合成方法。蒸发诱导自组装（EISA）是通过直接模板法制备纳米结构介孔氧化铝的唯一方法，但它是一种难以放大的方法。具有整体形状的大孔和介孔的氧化铝是一种非常有前途的用于流动应用的材料；描述了一种优化的合成方法。
