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Title: Selective catalytic reduction of nitric oxide with ethanol/gasoline blends over a silver/alumina catalyst

Abstract

Lean gasoline engines running on ethanol/gasoline blends and equipped with a silver/alumina catalyst for selective catalytic reduction (SCR) of NO by ethanol provide a pathway to reduced petroleum consumption through both increased biofuel utilization and improved engine efficiency relative to the current stoichiometric gasoline engines that dominate the U.S. light duty vehicle fleet. A pre-commercial silver/alumina catalyst demonstrated high NOx conversions over a moderate temperature window with both neat ethanol and ethanol/gasoline blends containing at least 50% ethanol. Selectivity to NH3 increases with HC dosing and ethanol content in gasoline blends, but appears to saturate at around 45%. NO2 and acetaldehyde behave like intermediates in the ethanol SCR of NO. NH3 SCR of NOx does not appear to play a major role in the ethanol SCR reaction mechanism. Ethanol is responsible for the low temperature SCR activity observed with the ethanol/gasoline blends. In conclusion, the gasoline HCs do not deactivate the catalyst ethanol SCR activity, but they also do not appear to be significantly activated by the presence of ethanol.

Authors:
 [1];  [1];  [2];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1131503
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Catalysis Today
Additional Journal Information:
Journal Volume: 231; Journal Issue: 1; Journal ID: ISSN 0920-5861
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; ethanol; SCR; lean NOx; silver alumina

Citation Formats

Pihl, Josh A., Toops, Todd J., Fisher, Galen B., and West, Brian H. Selective catalytic reduction of nitric oxide with ethanol/gasoline blends over a silver/alumina catalyst. United States: N. p., 2014. Web. doi:10.1016/j.cattod.2013.12.042.
Pihl, Josh A., Toops, Todd J., Fisher, Galen B., & West, Brian H. Selective catalytic reduction of nitric oxide with ethanol/gasoline blends over a silver/alumina catalyst. United States. https://doi.org/10.1016/j.cattod.2013.12.042
Pihl, Josh A., Toops, Todd J., Fisher, Galen B., and West, Brian H. 2014. "Selective catalytic reduction of nitric oxide with ethanol/gasoline blends over a silver/alumina catalyst". United States. https://doi.org/10.1016/j.cattod.2013.12.042.
@article{osti_1131503,
title = {Selective catalytic reduction of nitric oxide with ethanol/gasoline blends over a silver/alumina catalyst},
author = {Pihl, Josh A. and Toops, Todd J. and Fisher, Galen B. and West, Brian H.},
abstractNote = {Lean gasoline engines running on ethanol/gasoline blends and equipped with a silver/alumina catalyst for selective catalytic reduction (SCR) of NO by ethanol provide a pathway to reduced petroleum consumption through both increased biofuel utilization and improved engine efficiency relative to the current stoichiometric gasoline engines that dominate the U.S. light duty vehicle fleet. A pre-commercial silver/alumina catalyst demonstrated high NOx conversions over a moderate temperature window with both neat ethanol and ethanol/gasoline blends containing at least 50% ethanol. Selectivity to NH3 increases with HC dosing and ethanol content in gasoline blends, but appears to saturate at around 45%. NO2 and acetaldehyde behave like intermediates in the ethanol SCR of NO. NH3 SCR of NOx does not appear to play a major role in the ethanol SCR reaction mechanism. Ethanol is responsible for the low temperature SCR activity observed with the ethanol/gasoline blends. In conclusion, the gasoline HCs do not deactivate the catalyst ethanol SCR activity, but they also do not appear to be significantly activated by the presence of ethanol.},
doi = {10.1016/j.cattod.2013.12.042},
url = {https://www.osti.gov/biblio/1131503}, journal = {Catalysis Today},
issn = {0920-5861},
number = 1,
volume = 231,
place = {United States},
year = {Wed Feb 12 00:00:00 EST 2014},
month = {Wed Feb 12 00:00:00 EST 2014}
}