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Influence of Sodium and/or Phosphorus Addition on the Deactivation of Cu-FER Zeolites for SCR of NOx with NH3

  • M-L. Tarot
  • F. CanEmail author
  • E. E. Iojoiu
  • V. Lauga
  • X. CourtoisEmail author
Original Paper
  • 18 Downloads

Abstract

This work investigates the effect of sodium and phosphorus on the DeNOx performances of model Cu-FER SCR catalysts with two copper loadings (2.8 wt% and 6.1 wt%). These inorganic elements, present in the Biodiesel fuels and lubricants, were added by wet-impregnation using two solvents: water or ethanol. Catalysts were evaluated in standard-SCR conditions as well as in NO and NH3 oxidation, and characterized by means of H2-TPR and NH3 adsorption monitored by FT-IR. It was evidenced that catalytic behaviors were highly influenced by the implemented impregnation route with a stronger impact of water as solvent. Whatever the studied catalysts, NH3 adsorption capacities decreased after addition of sodium and/or phosphorus. Interestingly, sodium and phosphorus acted differently on the poisoning of NH3 adsorption sites. Na mainly poisoned Brønsted acid sites and favored a back exchange with Cu2+ species (especially when Na was added in water), while phosphorus directly interacted with copper species, mainly in exchange position. The deactivation observed at low temperature (250 °C) was preferentially due to the decrease in NH3 adsorption together with the increase in the copper-phosphorus interaction, especially for copper species in exchange position.

Keywords

Sodium Phosphorus Biodiesel NH3-SCR Cu exchanged zeolite Deactivation 

Notes

Acknowledgements

The authors acknowledge financial support from the European Union (ERDF), “Région Nouvelle Aquitaine” and the French National Agency for Research (ANR Appibio Project, Ref. ANR-14-CE22-0003).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.IC2MP (UMR 7285)Université de PoitiersPoitiers Cedex 9France
  2. 2.Renault Trucks -Volvo Group Trucks TechnologySaint-Priest CedexFrance

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