Influence of the sol-gel processing method on the structure and the porous texture of nondoped aluminas
- Universite Claude Bernard-Lyon, Villeurbanne (France)
Alumina supports for high-temperature catalysts were synthesized by different sol-gel methods, including on xerogel dried by simple evaporation and two aerogels dried by supercritical drying in CO{sub 2} or in alcohol. The influence of the gel synthesis technique and the additives used for gelation on the porous structure of alumina and its evolution during heat treatment at 400, 900, and 1200{degrees}C was analysed by X-ray diffraction and by the BET nitrogen adsorption method. Complexation with acetic acid at the gel step followed by supercritical drying at low temperature (35{degrees}C) caused a retardation of {alpha}-alumina formation with a significant residual specific surface area after heating for 5 h at 1200{degrees}C in air, namely 70 m{sup 2}/g. 21 refs., 5 figs., 1 tab.
- OSTI ID:
- 478773
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 166; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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