Towards High Surface Area α-Al2O3–Mn-Assisted Low Temperature Transformation
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Published:2023-04-12
Issue:8
Volume:16
Page:3047
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ISSN:1996-1944
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Container-title:Materials
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language:en
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Short-container-title:Materials
Author:
Jähnichen Tim1, Carstens Simon1ORCID, Franz Maximilian1, Laufer Otto1, Wenzel Marianne2ORCID, Matysik Jörg2ORCID, Enke Dirk1
Affiliation:
1. Institute of Chemical Technology, Leipzig University, Linnéstr. 3, D-04103 Leipzig, Germany 2. Institute of Analytical Chemistry, Leipzig University, Linnéstr. 3, D-04103 Leipzig, Germany
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.
Funder
Leipzig University
Subject
General Materials Science
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