Potential and Limitations of Natural Chabazite for Selective Catalytic Reduction of NOx with NH3

Authors

  • Tobias Günter,

    1. Karlsruhe Institute of Technology, Institute for Chemical Technology and Polymer Chemistry, Kaiserstraße 12, 76131 Karlsruhe, Germany
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  • Dr. Maria Casapu,

    1. Karlsruhe Institute of Technology, Institute for Chemical Technology and Polymer Chemistry, Kaiserstraße 12, 76131 Karlsruhe, Germany
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  • Dr. Dmitry Doronkin,

    1. Karlsruhe Institute of Technology, Institute for Chemical Technology and Polymer Chemistry, Kaiserstraße 12, 76131 Karlsruhe, Germany
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  • Dr. Stefan Mangold,

    1. Karlsruhe Institute of Technology, Institute for Synchrotron Radiation, P.O. Box 3640, 76021 Karlsruhe, Germany
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  • Vanessa Trouillet,

    1. Karlsruhe Institute of Technology, Institute for Applied Materials, P.O. Box 3640, 76021 Karlsruhe, Germany
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  • Timo Augenstein,

    1. Karlsruhe Institute of Technology, Institute for Inorganic Chemistry, Engesserstraße 15, 76131 Karlsruhe, Germany
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  • Prof. Jan-Dierk Grunwaldt

    Corresponding author
    1. Karlsruhe Institute of Technology, Institute for Chemical Technology and Polymer Chemistry, Kaiserstraße 12, 76131 Karlsruhe, Germany
    • Karlsruhe Institute of Technology, Institute for Chemical Technology and Polymer Chemistry, Kaiserstraße 12, 76131 Karlsruhe, Germany

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Abstract

The potential of the natural chabazite for the selective catalytic reduction (SCR) of NOx with NH3 is evaluated in the present work. Activity tests were performed under technically relevant reaction and temperature conditions for the fresh and hydrothermally aged catalysts. The natural chabazite before and after alkaline removal as well as after iron and copper addition were compared. The structural as well as surface and bulk properties were elucidated by a variety of complementary characterization techniques, i.e. XRD, XPS, EPR, BET, NH3-TPD, ex situ and in situ XAS. The results indicate that an important facet for using the natural chabazite for the standard and fast SCR reactions is the removal of alkaline metals, which at the same time also leads to a partial change of the structure and the size of the iron-containing particles. The performance and especially the hydrothermal stability can be further improved by copper addition.

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