- AutorIn
- Simon Carstens
- Ralf Meyer
- Dirk Enke
- Titel
- Towards Macroporous α-Al2O3—Routes, Possibilities and Limitations
- Zitierfähige Url:
- https://nbn-resolving.org/urn:nbn:de:bsz:15-qucosa2-848181
- Quellenangabe
- Materials
Erscheinungsjahr: 2020
Jahrgang: 13
Heft: 7
E-ISSN: 1996-1944
Artikelnummer: 1787 - Erstveröffentlichung
- 2020
- Abstract (EN)
- This article combines a systematic literature review on the fabrication of macroporous α-Al2O3 with increased specific surface area with recent results from our group. Publications claiming the fabrication of α-Al2O3 with high specific surface areas (HSSA) are comprehensively assessed and critically reviewed. An account of all major routes towards HSSA α-Al2O3 is given, including hydrothermal methods, pore protection approaches, dopants, anodically oxidized alumina membranes, and sol-gel syntheses. Furthermore, limitations of these routes are disclosed, as thermodynamic calculations suggest that γ-Al2O3 may be the more stable alumina modification for ABET > 175 m2/g. In fact, the highest specific surface area unobjectionably reported to date for α-Al2O3 amounts to 16–24 m2/g and was attained via a sol-gel process. In a second part, we report on some of our own results, including a novel sol-gel synthesis, designated as mutual cross-hydrolysis. Besides, the Mn-assisted α-transition appears to be a promising approach for some alumina materials, whereas pore protection by carbon filling kinetically inhibits the formation of α-Al2O3 seeds. These experimental results are substantiated by attempts to theoretically calculate and predict the specific surface areas of both porous materials and nanopowders.
- Andere Ausgabe
- Link zur Erstveröffentlichung
Link: https://doi.org/10.3390/ma13071787 - Freie Schlagwörter (EN)
- high surface area α-alumina; macroporosity; calculation of specific surface areas; sol-gel; AAO membranes; solid solutions of Mn in alumina; pore protection
- Klassifikation (DDC)
- 600
- Verlag
- MDPI, Basel
- Version / Begutachtungsstatus
- publizierte Version / Verlagsversion
- URN Qucosa
- urn:nbn:de:bsz:15-qucosa2-848181
- Veröffentlichungsdatum Qucosa
- 20.04.2023
- Dokumenttyp
- Artikel
- Sprache des Dokumentes
- Englisch
- Lizenz / Rechtehinweis
- CC BY 4.0