Iron ions in ZSM-5 zeolite: Fe3+ in framework, Fe2+ in extra-framework positions in catalytic N2O decomposition |
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| Authors: | K Lázár O Pozdnyakova A Wootsch P Fejes |
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| Institution: | (1) Institute of Isotopes, CRC, HAS, Budapest , P. O. B. 77, 1525, Hungary;(2) Department of Applied and Environmental Chemistry, University of Szeged, 6720 Szeged, Hungary |
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| Abstract: | Fe-ZSM-5 samples containing a combination of 57Fe3+ in framework (FW) and regular iron in extra-framework (EFW) sites were prepared by introducing 57Fe in hydrothermal synthesis, then exchanging Fe2+ of natural isotope composition into the lattice. The stability for one part of Fe2+ and Fe2+ ? Fe3+ reversibility for the other part in catalytic decomposition of N2O is demonstrated by in situ Mössbaer measurements. Formation of dinuclear FeFW–O–FeEFW pairs is not prevailing. |
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| Keywords: | Fe2+ and Fe3+ simultaneously N2O decomposition |
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