| Autor: |
Pitsch, Irene, Geßner, Wolfgang, Brückner, Angelika, Mehner, Hartmut, Möhmel, Steffen, Uecker, Doris-Christine, Pohl, Marga-Martina |
| Zdroj: |
Journal of Materials Chemistry; September 27, 2001, Vol. 11 Issue: 10 p2498-2503, 6p |
| Abstrakt: |
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 content between 1 and 10 wt% were synthesized by reaction of ammonium hydrogen carbonate with mixtures containing aluminium ammonium sulfate and ferric ammonium sulfate. The characterization of the as-synthesized and calcined products by chemical analysis, XRD, EPR, Mössbauer, 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 3040 Å) also contain very small Fe2O3 particles (<10 nm) at higher Fe contents. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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