Variety of available coordination sites for extra-framework iron in LTA and MFI zeolites

被引：0
|
作者：
Károly Lázár
Carole Vincent
Pál Fejes
机构：
[1] Institute of Isotopes,Department of Chemistry
[2] HAS,Department of Applied and Environmental Chemistry
[3] University of Poitiers,undefined
[4] University of Szeged,undefined
来源：
Hyperfine Interactions | 2008年 / 187卷
关键词：
Coordination of iron in zeolites; Framework and extra-framework sites; Fe; ↔ Fe; redox process;
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摘要：
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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页码：1 / 6
页数：5
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