Abstract
EXAFS spectroscopy is a very powerful tool to gain an insight of the structures of transition-metal complexes embedded in the pores of zeolitic materials. The existence of binuclear oxo-iron clusters in Fe/ZSM-5, which was postulated on the basis of FTIR and CO/H2 TPR experiments, was unambiguously confirmed by EXAFS. By comparison with data of Fe model- complexes available in the literature, it is proposed that the Fe species adopt a structure closely resembling the “diamond core” of the methane monooxygenase enzyme (Fe(μ-OH)2Fe). The EXAFS measurements provided Co-O distances and coordination numbers for Co/FER, MFI and MOR samples and thus enabled to characterize the average Co ion site in the zeolite framework. The results also indicated, in agreement with FTIR spectra, that Co ions deform the zeolite support to reach an optimal bonding with the framework.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Feng, X. and Hall, W. K. (1997) FeZSM-5: A durable SCR catalyst for NOx removal from combustion streams, J. Catal. 166, 368–376.
Li, Y. and Armor, J. N. (1994) Selective Reduction of NOx by methane on Co-ferrierites I. Reaction and kinetic studies, J. Catal. 150, 376–387.
Chen, H.-Y., and Sachtler, W. M. H. (1998) Activity and durability of Fe/ZSM5 catalysts for lean burn NOX reduction in the presence of water vapor, Catal. Today 42, 73–83.
Sobalík, Z., Dědeček, J., Kaucký, D., Wichterlová, B., Drozdová, L., and Prins, R. (2000) Structure, distribution and properties of Co ions in ferrierite revealed by FTIR, UV-VIS and EXAFS, J. Catal. (in press).
van Zon, J.B.A.D., Koningsberger, D.C., van’t Blik, H.F.J., and Sayers, D.E. (1985) An EXAFS study of the structure of the metal-support interface in highly dispersed Rh/Al2O3 catalysts, J. Chem. Phys. 82, 5742–5754.
Kirlin, P.S.,J. van Zon, B.A.D., Koningsberger, D.C., and Gates, B.C. (1990) Surface catalytic sites prepared from [HRe(CO)5] and [H3Re3(CO)12] mononuclear, trinuclear, and metallic rhenium catalysts supported on MgO, J. Phys. Chem. 94, 8439–8450.
Zabinsky, S.I., Rehr, J.J., Ankudinov, A., Albers, R.C., and Eller, M.J. (1995) Multiple scattering calculations of X-Ray absorption spectra, J. Phys. Rev. B 52, 2995–3009.
Joyner, R., and Stockenhuber, M. (1999) Preparation, characterization and performance of Fe-ZSM-5 catalysts, J. Phys. Chem. B. 103, 5963–5976.
Marturano, P., Drozdová, L., Kogelbauer, A., and Prins, R. (2000) Fe/ZSM-5 prepared by sublimation of FeCl3: the structure of the Fe species as determined by IR, 27A1 MAS NMR, and EXAFS spectroscopy, J. Catal. 192, 236–247.
El-Malki, E.-M., van Santen, R.A., and Sachtier, W. M. H. (1999) Introduction of Zn, Ga, and Fe into HZSM-5 cavities by sublimation: identification of acid sites, J. Phys. Chem. B 103, 4611–4622.
Wallar, B.J., and Lipscomb, J. D. (1996) Dioxygen activation by enzymes containing binuclear non-heme iron clusters, Chem. Rev. 96, 2625–2657.
Shu, L., Liu, Y., Lipscomb, J.D., and Que, L. J. (1996) X-ray absorption spectroscopic studies of the methane monooxygenase hydroxylase component from Methylosinus trichosporium OB3b, J. Biol. Inorg. Chem. 1, 297–304.
Marturano, P., Drozdová, L., Kogelbauer, A., and Prins, R. (manuscript in preparation).
Dědeček, J. and Wichterlová, B. (1999) Co2+ Ion Siting in Pentasil-Containing Zeolites. I. Co2+ Ions Sites and Their Occupation in Mordenite. A Vis-NIR Diffuse Reflectance Spectroscopy Study, J. Phys. Chem. B 103, 1462–1476.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2001 Springer Science+Business Media Dordrecht
About this chapter
Cite this chapter
Drozdová, L., Marturano, P., Wichterlová, B., Kogelbauer, A., Prins, R. (2001). Exafs Study of Fe/ZSM-5 Prepared by Chemical Vapour Deposition and Co/FER, MOR, MFI Prepared by Ion Exchange. In: Centi, G., Wichterlová, B., Bell, A.T. (eds) Catalysis by Unique Metal Ion Structures in Solid Matrices. NATO Science Series, vol 13. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0782-5_6
Download citation
DOI: https://doi.org/10.1007/978-94-010-0782-5_6
Publisher Name: Springer, Dordrecht
Print ISBN: 978-0-7923-6875-5
Online ISBN: 978-94-010-0782-5
eBook Packages: Springer Book Archive