Comparison of States of Substituted Iron in MCM-41 and MFI Molecular Sieves under Reaction Conditions

被引：0
|
作者：
K. Lázár
P. Fejes
G. Pál-Borbély
H. K. Beyer
机构：
[1] CRC,Institute of Isotope and Surface Chemistry
[2] University of Szeged,Dept. of Applied and Environmental Chemistry
[3] CRC,Institute of Chemistry
来源：
Hyperfine Interactions | 2002年 / 141-142卷
关键词：
Isomer Shift; Pore Wall; Quadrupole Splitting; Lorentzian Line Shape; Substitute Iron;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Redox properties of substituted iron in low-iron content Fe-MFI (Si/Fe≈200) and Fe-MCM-41 (Si/Fe=137) samples were compared by in situ Mössbauer spectroscopy (in vacuum, H2, CO, N2O, at 300 K <T< 600 K). The Fe3+ ↔ Fe2+ conversion may proceed reversibly in both hosts. In MFI the rigid structure of the framework is manifested: framework-substituted ferric ions are not reduced, the Fe3+ to Fe2+ reduction proceeding only on extraframework ions. The MCM-41 host is more flexible, allowing various Fe2+ coordinations to occur in the pore wall.
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页码：387 / 390
页数：3
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