Towards High Surface Area α-Al 2 O 3 -Mn-Assisted Low Temperature Transformation

When impregnated with manganiferous precursors, γ-Al O may be converted into α-Al O under relatively mild and energy-saving conditions. In this work, a manganese assisted conversion to corundum at temperatures as low as 800 °C is investigated. To observe the alumina phase transition, XRD and solid-s...

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Bibliographic Details
Published in:Materials 2023-04, Vol.16 (8)
Main Authors: Jähnichen, Tim, Carstens, Simon, Franz, Maximilian, Laufer, Otto, Wenzel, Marianne, Matysik, Jörg, Enke, Dirk
Format: Article
Language:English
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Summary:When impregnated with manganiferous precursors, γ-Al O may be converted into α-Al O under relatively mild and energy-saving conditions. In this work, a manganese assisted conversion to corundum at temperatures as low as 800 °C is investigated. To observe the alumina phase transition, XRD and solid-state Al-MAS-NMR are applied. By post-synthetical treatment in concentrated HCl, residual manganese is removed up to 3 wt.-%. Thereby, α-Al O with a high specific surface area of 56 m g is obtained after complete conversion. Just as for transition alumina, thermal stability is an important issue for corundum. Long-term stability tests were performed at 750 °C for 7 days. Although highly porous corundum was synthesized, the porosity decreased with time at common process temperatures.
ISSN:1996-1944
1996-1944