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The reduction/oxidation behaviour of MnAPO-5 as studied by ESR spectroscopy

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Abstract

It is shown by ESR spectroscopy that Mn2+ ions in MnAPO-5 are oxidized to Mn3+ during calcination atT⩾475 K. Mn2+ occupies variously distorted tetrahedral positions within the framework and in extra-lattice sites. Octahedrally coordinated Mn2+ presumably located in the channels becomes detectable after adsorption of water. The ESR spectra of reduced MnAPO-5 show line-narrowing due to spin exchange interactions. The material behaves reversible in redox cycles at temperatures near 500 K.

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Author notes

  1. A. Katzmarzyk

    Present address: Institut für Physikalische und Theoretische Chemie, Universität Erlangen-Nürnberg, Erlangen

Authors and Affiliations

  1. Institut für Physikalische Chemie, Universität München, Sophienstrasse 11, 8000, München 2, Germany

    A. Katzmarzyk & H. Knözinger

  2. Institut für Technische Chemie I, Universität Stuttgart, Pfaffenwaldring 55, 7000, Stuttgart, Germany

    S. Ernst & J. Weitkamp

Authors
  1. A. Katzmarzyk
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  2. S. Ernst
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  3. J. Weitkamp
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  4. H. Knözinger
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Katzmarzyk, A., Ernst, S., Weitkamp, J. et al. The reduction/oxidation behaviour of MnAPO-5 as studied by ESR spectroscopy. Catal Lett 9, 85–90 (1991). https://doi.org/10.1007/BF00769085

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  • DOI: https://doi.org/10.1007/BF00769085

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