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Influence of Hydrothermal Ageing on NH3-SCR Over Fe-BEA—Inhibition of NH3-SCR by Ammonia

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Abstract

The decay in ammonia adsorption capacity and the amount of active iron sites are important to consider in order to understand the deactivation processes of Fe-BEA for NH3-SCR catalyst applications. NH3 and NO storage capacity experiments together with kinetic modeling have been used to evaluate ammonia inhibition during NH3-SCR before and after hydrothermal treatment of H-BEA and Fe-BEA. The kinetic model shows that at least four types of acid sites for H-BEA and one additional site for Fe-BEA are required to predict the NH3 desorption well. NH3-TPD experiments together with simulations show that the strongest adsorption sites are the sites that are most affected by the hydrothermal treatment. For H-BEA a clear correlation between the ammonia storage capacity and the improved NOX conversion after NH3 cut-off during NH3-SCR is observed. However, for Fe-BEA an inhibiting effect of ammonia after NH3 cut-off is seen but no significant difference (i.e. increased NOX conversion time) between fresh and aged samples can be observed, indicating that the inhibiting effect is unaffected by the hydrothermal treatment.

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Acknowledgments

This work has been performed within the FFI program (Proj. No. 32900-1), which is financially supported by the Swedish Energy Agency and partly within the Competence Centre for Catalysis, which is hosted by Chalmers University of Technology and financially supported by the Swedish Energy Agency and the member companies AB Volvo, Volvo Car Corporation AB, Scania CV AB, Haldor Topsøe A/S, and ECAPS AB. Financial support from Knut and Alice Wallenberg Foundation, Dnr KAW 2005.0055, is gratefully acknowledged. The authors would also like to thank Volvo Group Trucks Technology and Miroslawa Milh for help with the hydrothermal treatment of the samples.

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Authors and Affiliations

  1. Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96, Gothenburg, Sweden

    Soran Shwan, Radka Nedyalkova, Louise Olsson & Magnus Skoglundh

  2. Volvo Group Trucks Technology, SE-405 08, Gothenburg, Sweden

    Jonas Jansson & John Korsgren

Authors
  1. Soran Shwan
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  2. Radka Nedyalkova
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  3. Jonas Jansson
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  4. John Korsgren
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  5. Louise Olsson
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  6. Magnus Skoglundh
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Correspondence to Soran Shwan.

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Shwan, S., Nedyalkova, R., Jansson, J. et al. Influence of Hydrothermal Ageing on NH3-SCR Over Fe-BEA—Inhibition of NH3-SCR by Ammonia. Top Catal 56, 80–88 (2013). https://doi.org/10.1007/s11244-013-9933-4

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  • DOI: https://doi.org/10.1007/s11244-013-9933-4

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