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Catalysis Letters

, Volume 130, Issue 3–4, pp 525–531 | Cite as

Role of Nitrate Species in the “NO2-SCR” Mechanism over a Commercial Fe-zeolite Catalyst for SCR Mobile Applications

  • Antonio Grossale
  • Isabella Nova
  • Enrico Tronconi
Article

Abstract

The NO2-SCR reaction is studied by transient reaction analysis over a Fe-zeolite commercial catalyst. It is proposed that the NO2-SCR reaction occurs according to a mechanism wherein surface nitrates are first formed by NO2 disproportionation, followed by their catalytic reduction to nitrogen by ammonia.

Keywords

Urea SCR NO2 SCR Nitrates Zeolite catalysts Diesel exhausts aftertreatment 

Notes

Acknowledgments

Financial support from Daimler AG is gratefully acknowledged. The Authors wish to thank Dr. Daniel Chatterjee and Dr. Michel Weibel for useful and stimulating discussions.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Antonio Grossale
    • 1
  • Isabella Nova
    • 1
  • Enrico Tronconi
    • 1
  1. 1.Dipartimento di Energia, Laboratory of Catalysis and Catalytic ProcessesPolitecnico di MilanoMilanItaly

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