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Variety of available coordination sites for extra-framework iron in LTA and MFI zeolites |
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| Authors: | Károly Lázár Carole Vincent Pál Fejes |
| Institution: | 1. Institute of Isotopes, HAS, P.O. Box 77, 1525, Budapest, Hungary 2. Department of Chemistry, University of Poitiers, 40 Ave. Recteur Pineau, 86022, Poitiers, France 3. Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, 6720, Szeged, Hungary |
| Abstract: | Variations in coordination states of extra-framework iron are studied in low iron content ferrisilicates (Si/57Fe ≈ 200) during various in situ treatments. In Fe-LTA complete Fe3+ ? Fe2?+? reversibility is observed. In Fe-MFI extra-framework iron can be stabilized in Fe2?+? state in spite of ambient oxidizing conditions (N2O, 620 K). Further, in Fe-MFI simultaneous stabilization of Fe2?+? and Fe3?+? may take place providing centres for redox catalytic processes. |
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