An efficient route to aqueous phase synthesis of nanocrystalline γ-Al2O3 with high porosity: From stable boehmite colloids to large pore mesoporous alumina

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:367

Article

Bleta, Rudina¹  Alphonse, Pierre¹  Pin, Lisa¹  Gressier, Marie¹  Menu, Marie-Joelle¹ 

[1] Univ Toulouse, CIRIMAT UPS CNRS, F-31062 Toulouse 9, France

关键词: Mesoporous gamma-Al2O3;    Sol-gel;    Boehmite colloids;    Triblock copolymer;    CMC;   

DOI  :  10.1016/j.jcis.2011.08.087

来源: Elsevier

【 摘 要 】

In this paper we emphasise the important role of Pluronic F127 on the porosity of mesoporous alumina prepared from boehmite colloids. By focusing on the F127/boehmite interactions we show how the concepts of interface science may help to predict and improve the textural characteristics of mesoporous alumina. By varying the synthetic parameters, in particular the copolymer content, we show that the porosity of gamma-Al2O3 can be enhanced by 400% and the average pore diameter can be expanded from 5 to 14 nm. These results are discussed in terms of interactions between the Pluronic F127 and boehmite colloids, and are correlated to the critical micelle concentration (CMC) of the copolymer. The textural characteristics of the mesoporous alumina can be further improved either by introducing hydrocarbons in the preformed boehmite/copolymer sols or by concentrating the sols. In comparison with as-synthesised alumina, those prepared with F127 showed improved thermal stability. Furthermore, boehmite/copolymer sols were stable for all surfactant concentrations investigated and can give high quality coatings suitable for catalytic applications. (C) 2011 Elsevier Inc. All rights reserved.

【 授权许可】

Free