Thermally-Activated Al(OH)3: Phase Transformations and Porosity

Anna Savel'eva; Tatiana Bugrova; Andrey Petrov; Valeriy Dutov; Grigory Mamontov

doi:10.4028/www.scientific.net/KEM.670.133

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 670Thermally-Activated Al(OH)3: Phase Transformations...

Thermally-Activated Al(OH)₃: Phase Transformations and Porosity

Abstract:

Thermochemically activated aluminum trihydroxide (Al (OH)₃) is an important intermediate for ceramics, construction materials, catalysts, etc. Functional properties of materials based on Al (OH)₃ depend on its phase composition and porosity. A series of thermochemically activated Al (OH)₃ calcined at temperatures from 120 to 800 °C were studied by low-temperature N₂ sorption, XRD and thermal analysis. It was shown that transformation of gibbsite to boehmite occurs below 300 °C and is accompanied by increasing of specific surface area and pore volume. Transformation of boehmite to γ-Al₂O₃ proceeds above 400 °C. The sample calcined at 500 °C was shown to consist of monophase γ-Al₂O₃ with specific surface area of 206 m²/g and pore volume of 0.55 cm³/g.

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Periodical:

Key Engineering Materials (Volume 670)

Pages:

133-138

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.670.133

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Online since:

October 2015

Authors:

Anna Savel'eva, Tatiana Bugrova, Andrey Petrov, Valeriy Dutov, Grigory Mamontov*

Keywords:

Alumina, Boehmite, Calcination, Thermochemically Activated Aluminum Trihydroxide

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* - Corresponding Author

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