Synthesis and characterization of Fe2O3 containing aluminas by thermal decomposition of modified ammonium dawsonite

Fe2O3-containing aluminas are of interest for catalytic applications and for preparing nanocomposites and coatings. Aluminas with Fe2O3 particles finely divided in the Al2O3 matrix were prepared via a crystalline precursor derived from ammonium dawsonite and its calcination. The precursors with Fe c...

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Bibliographic Details
Published in:Journal of materials chemistry 2001, Vol.11 (10), p.2498-2503
Main Authors: PITSCH, Irene, GESSNER, Wolfgang, BRÜCKNER, Angelika, MEHNER, Hartmut, MÖHMEL, Steffen, UECKER, Doris-Christine, POHL, Marga-Martina
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Porous materials
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Summary:Fe2O3-containing aluminas are of interest for catalytic applications and for preparing nanocomposites and coatings. Aluminas with Fe2O3 particles finely divided in the Al2O3 matrix were prepared via a crystalline precursor derived from ammonium dawsonite and its calcination. The precursors with Fe contents between 1 and 10 wt% were synthesised by reaction of ammonium hydrogen carbonate with mixtures containing aluminium ammonium sulphate and ferric ammonium sulphate. Characterisation of the as-synthesised and calcined products by chemical analysis, XRD, EPR, Mossbauer, TEM and adsorption measurements shows that all the Fe3+ ions are incorporated into the structure of dawsonite when the Fe content is low and that the calcined materials with micropores and mesopores (maximum 30-40 Angstroms) also contain very small Fe2O3 particles ( < 10 nm) at higher Fe contents. 14 refs.
ISSN:0959-9428
1364-5501
DOI:10.1039/b101466h