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

Josh A. Pihl; Todd J. Toops; Galen B. Fisher; Brian H. West

doi:10.1016/j.cattod.2013.12.042

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

Josh A. Pihl, Todd J. Toops, Galen B. Fisher, Brian H. West

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

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 NO_x 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 NO_x 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. The gasoline HCs do not deactivate the ethanol SCR activity, but they also do not appear to be significantly activated by the presence of ethanol.

Original language	English
Pages (from-to)	46-55
Number of pages	10
Journal	Catalysis Today
Volume	231
DOIs	https://doi.org/10.1016/j.cattod.2013.12.042
State	Published - Aug 1 2014

Funding

This research was sponsored by the U.S. Department of Energy , Office of Energy Efficiency and Renewable Energy , Vehicle Technologies Office . The authors thank program manager Kevin Stork for his support. The authors also thank Catalytic Solutions for the prototype catalyst and Prof. Hanna Härelind and Fredrik Gunnarsson for sharing their insights on this work. This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes.

Funders	Funder number
Office of Energy Efficiency and Renewable Energy , Vehicle Technologies Office	DE-AC05-00OR22725
U.S. Department of Energy

Keywords

Ethanol
SCR
Silver alumina

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.cattod.2013.12.042

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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. The gasoline HCs do not deactivate the ethanol SCR activity, but they also do not appear to be significantly activated by the presence of ethanol.",

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AU - Toops, Todd J.

AU - Fisher, Galen B.

AU - West, Brian H.

PY - 2014/8/1

Y1 - 2014/8/1

N2 - 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. The gasoline HCs do not deactivate the ethanol SCR activity, but they also do not appear to be significantly activated by the presence of ethanol.

AB - 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. The gasoline HCs do not deactivate the ethanol SCR activity, but they also do not appear to be significantly activated by the presence of ethanol.

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

Abstract

Funding

Keywords

UN SDGs

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