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DeNOx active iron sites in iron loaded ZSM-5 – a multitechnique analysis of a complex heterogeneous catalyst based on Mössbauer spectroscopy

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Abstract

Iron loaded zeolites like Fe-ZSM-5 are potent candidates for the catalytic abatement of nitrogen oxides from car exhaust, e.g. from Diesel engines. Recent problems in this field show that there is an urgent need in further improvement of such catalysts, for which a full analysis of Fe species present in them under different conditions is highly desirable. We have studied Fe-ZSM-5 catalysts prepared via solid-state ion exchange by using field dependent Mössbauer spectroscopy at low temperature in order to identify the different iron species present in this type of catalyst in the fresh state and after use in catalysis. Mössbauer spectroscopy proved to be the key technique for a full understanding of species structures, but due to the complexity of structures, guidance by parallel EPR experiments and control by SQUID magnetometry were essential to prove reliability of derived species distributions.

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Acknowledgments

V.S., A.B. and W.G. thank the DFG for funding under Schu 1251/15-2, BR 1380/18-2, GR 1447/21-2. The support of the research initiative NANOKAT is also acknowledged (V.S.).

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Authors and Affiliations

  1. Department of Physics, University of Kaiserslautern, 67663, Kaiserslautern, Germany

    K. G. Padmalekha, H. Huang & V. Schünemann

  2. Lehrstuhl Technische Chemie, Ruhr-Universität Bochum, Universitätsstraße 150, 44801, Bochum, Germany

    I. Ellmers & W. Grünert

  3. Leibniz-Institut für Katalyse e. V., 18059, Rostock, Germany

    R. Pérez Vélez & A. Brückner

  4. Institut für Anorganische Chemie, RWTH Aachen, 52056, Aachen, Germany

    J. van Leusen

Authors
  1. K. G. Padmalekha
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  2. H. Huang
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  3. I. Ellmers
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  4. R. Pérez Vélez
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  5. J. van Leusen
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  6. A. Brückner
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  7. W. Grünert
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  8. V. Schünemann
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Corresponding author

Correspondence to V. Schünemann.

Additional information

This article is part of the Topical Collection on Proceedings of the International Conference on the Applications of the Mössbauer Effect (ICAME 2017), Saint-Petersburg, Russia, 3–8 September 2017

Edited by Valentin Semenov

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Padmalekha, K.G., Huang, H., Ellmers, I. et al. DeNOx active iron sites in iron loaded ZSM-5 – a multitechnique analysis of a complex heterogeneous catalyst based on Mössbauer spectroscopy. Hyperfine Interact 238, 80 (2017). https://doi.org/10.1007/s10751-017-1444-4

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  • DOI: https://doi.org/10.1007/s10751-017-1444-4

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