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Title: New mechanistic insights in the NH3-SCR reactions at low temperature

Abstract

The present study is focused on the investigation of the low temperature Standard SCR reaction mechanism over Fe- and Cu-promoted zeolites. Different techniques are employed, including in situ DRIFTS, transient reaction analysis and chemical trapping techniques. The results present strong evidence of nitrite formation in the oxidative activation of NO and of their role in SCR reactions. These elements lead to a deeper understanding of the standard SCR chemistry at low temperature and can potentially improve the consistency of mechanistic mathematical models. Furthermore, comprehension of the mechanism on a fundamental level can contribute to the development of improved SCR catalysts.

Authors:
 [1];  [1];  [1];  [1];  [2];  [2];  [2]
  1. Politecnico di Milano (Italy). Dipartimento di Energia
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Fuels Engines and Emissions Research Center
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Fuels, Engines and Emissions Research Center (FEERC); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). National Transportation Research Center (NTRC)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1295099
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Topics in Catalysis
Additional Journal Information:
Journal Volume: 59; Journal Issue: 10-12; Journal ID: ISSN 1022-5528
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; low temperature SCR; Cu zeolite; Fe zeolite; SCR mechanism; in situ DRIFTS; chemical trapping

Citation Formats

Ruggeri, Maria Pia, Selleri, Tomasso, Nova, Isabella, Tronconi, Enrico, Pihl, Josh A., Toops, Todd J., and Partridge, Jr., William P. New mechanistic insights in the NH3-SCR reactions at low temperature. United States: N. p., 2016. Web. doi:10.1007/s11244-016-0567-1.
Ruggeri, Maria Pia, Selleri, Tomasso, Nova, Isabella, Tronconi, Enrico, Pihl, Josh A., Toops, Todd J., & Partridge, Jr., William P. New mechanistic insights in the NH3-SCR reactions at low temperature. United States. https://doi.org/10.1007/s11244-016-0567-1
Ruggeri, Maria Pia, Selleri, Tomasso, Nova, Isabella, Tronconi, Enrico, Pihl, Josh A., Toops, Todd J., and Partridge, Jr., William P. 2016. "New mechanistic insights in the NH3-SCR reactions at low temperature". United States. https://doi.org/10.1007/s11244-016-0567-1. https://www.osti.gov/servlets/purl/1295099.
@article{osti_1295099,
title = {New mechanistic insights in the NH3-SCR reactions at low temperature},
author = {Ruggeri, Maria Pia and Selleri, Tomasso and Nova, Isabella and Tronconi, Enrico and Pihl, Josh A. and Toops, Todd J. and Partridge, Jr., William P.},
abstractNote = {The present study is focused on the investigation of the low temperature Standard SCR reaction mechanism over Fe- and Cu-promoted zeolites. Different techniques are employed, including in situ DRIFTS, transient reaction analysis and chemical trapping techniques. The results present strong evidence of nitrite formation in the oxidative activation of NO and of their role in SCR reactions. These elements lead to a deeper understanding of the standard SCR chemistry at low temperature and can potentially improve the consistency of mechanistic mathematical models. Furthermore, comprehension of the mechanism on a fundamental level can contribute to the development of improved SCR catalysts.},
doi = {10.1007/s11244-016-0567-1},
url = {https://www.osti.gov/biblio/1295099}, journal = {Topics in Catalysis},
issn = {1022-5528},
number = 10-12,
volume = 59,
place = {United States},
year = {Fri May 06 00:00:00 EDT 2016},
month = {Fri May 06 00:00:00 EDT 2016}
}

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Cited by: 14 works
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Works referenced in this record:

A Common Intermediate for N 2 Formation in Enzymes and Zeolites: Side-On Cu-Nitrosyl Complexes
journal, August 2013


Operando Spatially- and Time-Resolved XAS Study on Zeolite Catalysts for Selective Catalytic Reduction of NO x by NH 3
journal, May 2014


In Situ-DRIFTS Study of Selective Catalytic Reduction of NO x by NH 3 over Cu-Exchanged SAPO-34
journal, April 2013


In-situ DRIFTS measurements for the mechanistic study of NO oxidation over a commercial Cu-CHA catalyst
journal, May 2015


A comparative study of the NH3-SCR reactions over a Cu-zeolite and a Fe-zeolite catalyst
journal, June 2010


Selective Catalytic Reduction of NO x over H-ZSM-5 Under Lean Conditions Using Transient NH 3 Supply
journal, July 2004


Detailed kinetic modeling of NH3 SCR over Cu-ZSM-5
journal, October 2009


In situ DRIFTS-MS studies on the oxidation of adsorbed NH3 by NOx over a Cu-SSZ-13 zeolite
journal, April 2013


NO2 adsorption on Fe- and Cu-zeolite catalysts: The effect of the catalyst red–ox state
journal, January 2012


Works referencing / citing this record:

Analysis of AdSCR Systems for NOx Removal During the Cold-Start Period of Diesel Engines
journal, January 2019


A PGM-free NO x adsorber + selective catalytic reduction catalyst system (AdSCR) for trapping and reducing NO x in lean exhaust streams at low temperature
journal, January 2018


Temperature-dependent dynamics of NH 3 -derived Cu species in the Cu-CHA SCR catalyst
journal, January 2019