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Ortega, Klaus Friedel ; Anke, Sven ; Salamon, Soma ; Özcan, Fatih ; Heese, Justus ; Andronescu, Corina ; Landers, Joachim ; Wende, Heiko ; Schuhmann, Wolfgang ; Muhler, Martin ; Lunkenbein, Thomas ; Behrens, Malte:
Topotactic Synthesis of Porous Cobalt Ferrite Platelets from a Layered Double Hydroxide Precursor and Their Application in Oxidation Catalysis.
In: Chemistry : a European Journal.
Bd. 23
(2017)
Heft 51
.
- S. 12443-12449.
ISSN 1521-3765
DOI: https://doi.org/10.1002/chem.201702248
Abstract
Monocrystalline, yet porous mosaic platelets of cobalt ferrite, CoFe2O4, can be synthesized from a layered double hydroxide (LDH) precursor by thermal decomposition. Using an equimolar mixture of Fe2+, Co2+, and Fe3+ during co-precipitation, a mixture of LDH, ((FeCoII)-Co-II)(2/3)Fe-1/3(III)(OH)(2)(CO3)(1/6)mH(2)O, and the target spinel CoFe2O4 can be obtained in the precursor. During calcination, the remaining Fe-II fraction of the LDH is oxidized to Fe-III leading to an overall Co2+:Fe3+ ratio of 1:2 as required for spinel crystallization. This pre-adjustment of the spinel composition in the LDH precursor suggests a topotactic crystallization of cobalt ferrite and yields phase pure spinel in unusual anisotropic platelet morphology. The preferred topotactic relationship in most particles is [111](Spinel)vertical bar[001](LDH). Due to the anion decomposition, holes are formed throughout the quasi monocrystalline platelets. This synthesis approach can be used for different ferrites and the unique microstructure leads to unusual chemical properties as shown by the application of the ex-LDH cobalt ferrite as catalyst in the selective oxidation of 2-propanol. Compared to commercial cobalt ferrite, which mainly catalyzes the oxidative dehydrogenation to acetone, the main reaction over the novel ex-LDH cobalt is dehydration to propene. Moreover, the oxygen evolution reaction (OER) activity of the ex-LDH catalyst was markedly higher compared to the commercial material.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | WOS:000410329100003 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Eingestellt am: | 13 Jun 2025 07:45 |
| Letzte Änderung: | 13 Jun 2025 07:45 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/93720 |