Influence of Ethyl Acetoacetate on the Structure and Thermal Stability of Alumina Aerogel

Abstract:

Alumina aerogels were prepared from aluminum sect-butoxide via sol-gel process and supercritical drying. The influence of Ethyl acetoacetate (Etac) on the aerogel properties, microstructure, and thermal stability was systematically studied. At the same time, reaction mechanism was also investigated. The results show that, without and with Etac addition, the alumina aerogels are consisted of crystalline boehmite and amorphous network, respectively. When n_Etac/n_Al molar ratio is 0.01~0.15:1, Al₂O₃ aerogels have larger surface area (71~98 m²/g) than pure alumina aerogel (61m²/g) after heated at 1200°C, a proper ratio of Etac is helpful to increases the gelation time and stability of alumina sol, and is useful to improve the thermal stability of Al₂O₃ aerogels.

• Periodical: Materials Science Forum (Volume 816)
• Pages: 157-162
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.816.157
• Online since: April 2015
• Authors: Lin Xu, Yong Gang Jiang*, Jun Zong Feng, Jian Feng
• Keywords: Al₂O₃ Aerogel, Aluminum Sect-Butoxide, Ethyl Acetoacetate, Surface Area

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