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Lean NOx Removal by a Bifunctional (EtOH + NH3) Mixture Dedicated to (Ag/Al2O3 + NH3-SCR) Dual-Bed Catalytic System: Comparison Between WO3/CeZrO2 and Cu–FER as NH3-SCR Catalyst

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Abstract

In a previous study, a drastic enhancement of the NOx conversion in EtOH-SCR process was achieved by means of ammonia and ethanol co-feeding over Ag/Al2O3 catalyst to avoid the NO2/NOx ratio dependency of conventional implemented urea-SCR technology. The ammonia activation was mainly attributed to the availability of hydrogen H* species resulting from EtOH dehydrogenation, which promoted the H2 assisted NH3-SCR over Ag/Al2O3. Additional conversion gain was reached with a dual-bed configuration in which a NH3-SCR catalyst (WO3/CexZr1−xO2) was added downstream to the silver-based sample (Ag/Al2O3 + NH3-SCR catalyst). This study deals with the influence of the SCR catalyst formulation on the catalytic performances of the dual-bed system. Oxide-based sample (WO3/CexZr1−xO2) and exchanged copper zeolite (Cu2.5–FER) were selected as model NH3-SCR catalysts. Results shows that WO3/CexZr1−xO2 in more appropriate in dual-bed configuration for (EtOH + NH3)-SCR process because ammonia and ethanol (or its by-products) strongly interacted together on Cu2.5–FER.

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Acknowledgements

The authors thank the European communities (FEDER) and the “Région Nouvelle Aquitaine” for financial support.

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Authors and Affiliations

  1. IC2MP (UMR 7285), Université de Poitiers, 4 rue Michel Brunet, 86073, Poitiers Cedex 9, France

    M. Barreau, M. Delporte, X. Courtois & F. Can

  2. Renault Trucks -Volvo Group Trucks Technology, 99 route de Lyon, 69806, Saint-Priest Cedex, France

    E. Iojoiu

Authors
  1. M. Barreau
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  2. M. Delporte
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  3. E. Iojoiu
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  4. X. Courtois
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  5. F. Can
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Correspondence to X. Courtois or F. Can.

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Barreau, M., Delporte, M., Iojoiu, E. et al. Lean NOx Removal by a Bifunctional (EtOH + NH3) Mixture Dedicated to (Ag/Al2O3 + NH3-SCR) Dual-Bed Catalytic System: Comparison Between WO3/CeZrO2 and Cu–FER as NH3-SCR Catalyst. Top Catal 62, 79–85 (2019). https://doi.org/10.1007/s11244-018-1104-1

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  • DOI: https://doi.org/10.1007/s11244-018-1104-1

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