Evolution of Fe species during the synthesis of over-exchanged Fe/ZSM5 obtained by chemical vapor deposition of FeCl3

AA Battiston, JH Bitter, FMF de Groot, AR Overweg, O Stephan, JA van Bokhoven, PJ Kooyman, C van der Spek, G Vanko, DC Koningsberger*

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    Abstract

    The evolution of iron in over-exchanged Fe/ZSM5 prepared via chemical vapor deposition of FeCl3 was studied at each stage of the synthesis. Different characterization techniques (EXAFS, HR-XANES, Fe-57 Mossbauer spectroscopy, Al-27 NMR, EELS, HR-TEM, XRD, N-2 physisorption, and FTIR spectroscopy) were applied in order to correlate the changes occurring in the local environment of the Fe atoms with migration and aggregation phenomena of iron at micro- and macroscopic scale. Mononuclear isolated Fe-species are formed upon FeCl3 sublimation, which are transformed into binuclear Fe-complexes during washing. During calcination, iron detached from the Bronsted sites migrates to the external surface of the zeolite, finally leading to significant agglomeration. Nevertheless, agglomeration of Fe can be strongly suppressed by adequately tuning the conditions of the calcination. (C) 2002 Elsevier Science (USA). All rights reserved.

    Original languageEnglish
    Article numberPII S0021-9517(02)00051-9
    Pages (from-to)251-271
    Number of pages21
    JournalJournal of Catalysis
    Volume213
    Issue number2
    DOIs
    Publication statusPublished - 25 Jan 2003

    Keywords

    • Fe/ZSM5
    • binuclear
    • iron
    • synthesis
    • evolution
    • calcination
    • X-RAY-ABSORPTION
    • SELECTIVE CATALYTIC REDUCTION
    • STATE ION-EXCHANGE
    • FINE-STRUCTURE
    • NOX REDUCTION
    • ADSORPTION COMPLEXES
    • EXAFS SPECTROSCOPY
    • FE-ZSM-5 CATALYSTS
    • XAFS SPECTROSCOPY
    • FE/MFI CATALYSTS

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