Challenges and Strategies in the Synthesis of Mesoporous Alumina Powders and Hierarchical Alumina Monoliths

Materials

Sarah Hartmann¹  Alexander Sachse¹ 

[1] Institut Charles Gerhardt Montpellier, UMR 5253 CNRS/UM2/ENSCM/UM1, ENSCM 8 Rue de l’Ecole Normale, 34296 Montpellier Cedex 5, France;

关键词: mesoporous alumina;    high surface area alumina;    alumina monolith;    hierarchical porosity;    nanostructured alumina;    catalyst support;   

DOI  :  10.3390/ma5020336

来源: mdpi

【 摘 要 】

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⁻¹), large pore volumes (0.8 mL g⁻¹) 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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.