Evolution of Fe species during the synthesis of over-exchanged Fe/ZSM5 obtained by chemical vapor deposition of FeCl3
Publication date
2003-01-25
Authors
Battiston, AA
Bitter, J.H.
de Groot, F. M. F.
Overweg, AR
Stephan, O
Tjeerdsma - van Bokhoven, Hanne
Kooyman, PJ
van der Spek, C.
Vanko, G
Koningsberger, DC
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Article
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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.
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
Citation
Battiston, AA, Bitter, JH, de Groot, FMF, Overweg, AR, Stephan, O, van Bokhoven, JA, Kooyman, PJ, van der Spek, C, Vanko, G & Koningsberger, DC 2003, 'Evolution of Fe species during the synthesis of over-exchanged Fe/ZSM5 obtained by chemical vapor deposition of FeCl3', Journal of Catalysis, vol. 213, no. 2, PII S0021-9517(02)00051-9, pp. 251-271. https://doi.org/10.1016/S0021-9517(02)00051-9