Lean NOx reduction over Ag/alumina catalysts via ethanol-SCR using ethanol/gasoline blends

Fredrik Gunnarsson; Josh A. Pihl; Todd J. Toops; Magnus Skoglundh; Hanna Härelind

doi:10.1016/j.apcatb.2016.09.009

Lean NO_x reduction over Ag/alumina catalysts via ethanol-SCR using ethanol/gasoline blends

Fredrik Gunnarsson, Josh A. Pihl, Todd J. Toops, Magnus Skoglundh, Hanna Härelind

Applied Catalysis&Emissions Res. Group

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

38 Scopus citations

Abstract

This study focuses on the activity for lean NO_x reduction over sol-gel synthesized silver alumina (Ag/Al₂O₃) catalysts, with and without platinum doping, using ethanol (EtOH), EtOH/C₃H₆ and EtOH/gasoline blends as reducing agents. The effect of ethanol concentration, both by varying the hydrocarbon-to-NO_x ratio and by alternating the gasoline concentration in the EtOH/gasoline mixture, is investigated. High activity for NO_x reduction is demonstrated for powder catalysts for EtOH and EtOH/C₃H₆ as well as for monolith coated catalysts (EtOH and EtOH/gasoline). The results show that pure Ag/Al₂O₃ catalysts display higher NO_x reduction and lower light-off temperature as compared to the platinum doped samples. The 4 wt.% Ag/Al₂O₃ catalyst displays 100% reduction in the range 340–425 °C, with up to 37% selectivity towards NH₃. These results are also supported by DRIFTS (Diffuse reflection infrared Fourier transform spectroscopy) experiments. The high ammonia formation could, in combination with an NH₃-SCR catalyst, be utilized to construct a NO_x reduction system with lower fuel penalty cf. stand alone HC-SCR. In addition, it would result in an overall decrease in CO₂ emissions.

Original language	English
Pages (from-to)	42-50
Number of pages	9
Journal	Applied Catalysis B: Environmental
Volume	202
DOIs	https://doi.org/10.1016/j.apcatb.2016.09.009
State	Published - Mar 1 2017

Funding

This work has been performed within the Competence Centre for Catalysis, which is hosted by Chalmers University of Technology and financially supported by the Swedish Energy Agency and the member companies AB Volvo, ECAPS AB, Haldor Topsøe A/S, Scania CV AB, Volvo Car Corporation AB and Wärtsilä Finland Oy. Financial support from Knut and Alice Wallenberg Foundation , Dnr KAW 2005.0055 , and Area of Advance Transport are gratefully acknowledged. This manuscript has been co-authored by UT-Battelle, LLC, under Contract No. DE-AC0500OR22725 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 the United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).

Funders	Funder number
AB Volvo
ECAPS AB
Haldor Topsøe A/S, Scania CV AB
Volvo Car Corporation
U.S. Department of Energy
UT-Battelle	DE-AC0500OR22725
Knut och Alice Wallenbergs Stiftelse	Dnr KAW 2005.0055
Energimyndigheten

Keywords

Ag/AlO
HC-SCR
Lean NO reduction
Platinum doping
Silver-alumina

UN SDGs

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

Access to Document

10.1016/j.apcatb.2016.09.009

Cite this

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title = "Lean NOx reduction over Ag/alumina catalysts via ethanol-SCR using ethanol/gasoline blends",

abstract = "This study focuses on the activity for lean NOx reduction over sol-gel synthesized silver alumina (Ag/Al2O3) catalysts, with and without platinum doping, using ethanol (EtOH), EtOH/C3H6 and EtOH/gasoline blends as reducing agents. The effect of ethanol concentration, both by varying the hydrocarbon-to-NOx ratio and by alternating the gasoline concentration in the EtOH/gasoline mixture, is investigated. High activity for NOx reduction is demonstrated for powder catalysts for EtOH and EtOH/C3H6 as well as for monolith coated catalysts (EtOH and EtOH/gasoline). The results show that pure Ag/Al2O3 catalysts display higher NOx reduction and lower light-off temperature as compared to the platinum doped samples. The 4 wt.% Ag/Al2O3 catalyst displays 100% reduction in the range 340–425 °C, with up to 37% selectivity towards NH3. These results are also supported by DRIFTS (Diffuse reflection infrared Fourier transform spectroscopy) experiments. The high ammonia formation could, in combination with an NH3-SCR catalyst, be utilized to construct a NOx reduction system with lower fuel penalty cf. stand alone HC-SCR. In addition, it would result in an overall decrease in CO2 emissions.",

keywords = "Ag/AlO, HC-SCR, Lean NO reduction, Platinum doping, Silver-alumina",

author = "Fredrik Gunnarsson and Pihl, {Josh A.} and Toops, {Todd J.} and Magnus Skoglundh and Hanna H{\"a}relind",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2017",

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doi = "10.1016/j.apcatb.2016.09.009",

language = "English",

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AU - Pihl, Josh A.

AU - Toops, Todd J.

AU - Skoglundh, Magnus

AU - Härelind, Hanna

PY - 2017/3/1

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N2 - This study focuses on the activity for lean NOx reduction over sol-gel synthesized silver alumina (Ag/Al2O3) catalysts, with and without platinum doping, using ethanol (EtOH), EtOH/C3H6 and EtOH/gasoline blends as reducing agents. The effect of ethanol concentration, both by varying the hydrocarbon-to-NOx ratio and by alternating the gasoline concentration in the EtOH/gasoline mixture, is investigated. High activity for NOx reduction is demonstrated for powder catalysts for EtOH and EtOH/C3H6 as well as for monolith coated catalysts (EtOH and EtOH/gasoline). The results show that pure Ag/Al2O3 catalysts display higher NOx reduction and lower light-off temperature as compared to the platinum doped samples. The 4 wt.% Ag/Al2O3 catalyst displays 100% reduction in the range 340–425 °C, with up to 37% selectivity towards NH3. These results are also supported by DRIFTS (Diffuse reflection infrared Fourier transform spectroscopy) experiments. The high ammonia formation could, in combination with an NH3-SCR catalyst, be utilized to construct a NOx reduction system with lower fuel penalty cf. stand alone HC-SCR. In addition, it would result in an overall decrease in CO2 emissions.

AB - This study focuses on the activity for lean NOx reduction over sol-gel synthesized silver alumina (Ag/Al2O3) catalysts, with and without platinum doping, using ethanol (EtOH), EtOH/C3H6 and EtOH/gasoline blends as reducing agents. The effect of ethanol concentration, both by varying the hydrocarbon-to-NOx ratio and by alternating the gasoline concentration in the EtOH/gasoline mixture, is investigated. High activity for NOx reduction is demonstrated for powder catalysts for EtOH and EtOH/C3H6 as well as for monolith coated catalysts (EtOH and EtOH/gasoline). The results show that pure Ag/Al2O3 catalysts display higher NOx reduction and lower light-off temperature as compared to the platinum doped samples. The 4 wt.% Ag/Al2O3 catalyst displays 100% reduction in the range 340–425 °C, with up to 37% selectivity towards NH3. These results are also supported by DRIFTS (Diffuse reflection infrared Fourier transform spectroscopy) experiments. The high ammonia formation could, in combination with an NH3-SCR catalyst, be utilized to construct a NOx reduction system with lower fuel penalty cf. stand alone HC-SCR. In addition, it would result in an overall decrease in CO2 emissions.

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