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Challenges and Strategies in the Synthesis of Mesoporous Alumina Powders and Hierarchical Alumina Monoliths
Institut Charles Gerhardt Montpellier, UMR 5253 CNRS/UM2/ENSCM/UM1, ENSCM 8 Rue de l’Ecole Normale, 34296 Montpellier Cedex 5, France
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Received: 14 December 2011; in revised form: 13 February 2012 / Accepted: 13 February 2012 / Published: 20 February 2012
Abstract: 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.
Keywords: mesoporous alumina; high surface area alumina; alumina monolith; hierarchical porosity; nanostructured alumina; catalyst support
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Hartmann, S.; Sachse, A.; Galarneau, A. Challenges and Strategies in the Synthesis of Mesoporous Alumina Powders and Hierarchical Alumina Monoliths. Materials 2012, 5, 336-349.
Hartmann S, Sachse A, Galarneau A. Challenges and Strategies in the Synthesis of Mesoporous Alumina Powders and Hierarchical Alumina Monoliths. Materials. 2012; 5(2):336-349.
Hartmann, Sarah; Sachse, Alexander; Galarneau, Anne. 2012. "Challenges and Strategies in the Synthesis of Mesoporous Alumina Powders and Hierarchical Alumina Monoliths." Materials 5, no. 2: 336-349.