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Characterization and Analysis on the Thermal Transformation of Boehmite Synthesized by Yoldas Method
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Characterization and Analysis on the Thermal Transformation of Boehmite Synthesized by Yoldas Method

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Abstract:

The boehmite (AlOOH) sol derived from aluminium isopropoxide was synthesized by Yoldas method. The physicochemical process and phase transition of AlOOH were investigated by TG-DSC, N2 adsorption-desorption, XRD and TEM. The results showed that upon heating, AlOOH lost the physicsorbed water first, and then lost the chemisorbed water at 242 °C, and the dehydroxylation occurred at 361 °C. The BET surface area, total pore volume and pore diameter increased, since the waters were lost. The orthorhombic AlOOH transformed to the cubic γ-Al2O3 at 361 °C, the cubic η-Al2O3 appeared after 484 °C, the monoclinic θ-Al2O3 and rhombohedral α-Al2O3 appeared after 1026 °C, and it totally turned into α-Al2O3 at 1237 °C.

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Periodical:

Advanced Materials Research (Volumes 532-533)

Pages:

3-7

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.532-533.3

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Online since:

June 2012

Authors:

Qiu Cheng Su, Shao Hong Zhang, Pei Li Chen, Xin Jun Li, Juan Fu, Long Long Ma

Keywords:

AlOOH, N2 Adsorption-Desorption, TEM, TG-DSC, Thermal Transformation, X-Ray Diffraction (XRD)

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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