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Towards High Surface Area α-Al2O3-Mn-Assisted Low Temperature Transformation.


ABSTRACT: When impregnated with manganiferous precursors, γ-Al2O3 may be converted into α-Al2O3 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 27Al-MAS-NMR are applied. By post-synthetical treatment in concentrated HCl, residual manganese is removed up to 3 wt.-%. Thereby, α-Al2O3 with a high specific surface area of 56 m2 g-1 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.

SUBMITTER: Jahnichen T 

PROVIDER: S-EPMC10142860 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature

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Towards High Surface Area α-Al<sub>2</sub>O<sub>3</sub>-Mn-Assisted Low Temperature Transformation.

Jähnichen Tim T   Carstens Simon S   Franz Maximilian M   Laufer Otto O   Wenzel Marianne M   Matysik Jörg J   Enke Dirk D  

Materials (Basel, Switzerland) 20230412 8


When impregnated with manganiferous precursors, γ-Al<sub>2</sub>O<sub>3</sub> may be converted into α-Al<sub>2</sub>O<sub>3</sub> 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 <sup>27</sup>Al-MAS-NMR are applied. By post-synthetical treatment in concentrated HCl, residual manganese is removed up to 3 wt.-%. Thereby, α-Al<su  ...[more]

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