Lean NOx reduction over Ag/alumina catalysts via ethanol-SCR using ethanol/gasoline blends
Abstract
This paper 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. Finally, 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.
- Authors:
-
- Chalmers Univ. of Technology, Gothenburg (Sweden). Dept. of Chemistry and Chemical Engineering. Competence Centre for Catalysis
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Fuels, Engines, and Emissions Research Center
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Chalmers University of Technology, Gothenburg (Sweden)
- Sponsoring Org.:
- USDOE; Swedish Energy Agency (Sweden); Knut and Alice Wallenberg Foundation (Sweden)
- OSTI Identifier:
- 1327667
- Grant/Contract Number:
- AC05-00OR22725; Dnr KAW 2005.0055
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Catalysis. B, Environmental
- Additional Journal Information:
- Journal Volume: 202; Journal ID: ISSN 0926-3373
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Silver-alumina; Ag/Al2O3; HC-SCR; Platinum doping; Lean NOx reduction
Citation Formats
Gunnarsson, Fredrik, Pihl, Josh A., Toops, Todd J., Skoglundh, Magnus, and Härelind, Hanna. Lean NOx reduction over Ag/alumina catalysts via ethanol-SCR using ethanol/gasoline blends. United States: N. p., 2016.
Web. doi:10.1016/j.apcatb.2016.09.009.
Gunnarsson, Fredrik, Pihl, Josh A., Toops, Todd J., Skoglundh, Magnus, & Härelind, Hanna. Lean NOx reduction over Ag/alumina catalysts via ethanol-SCR using ethanol/gasoline blends. United States. https://doi.org/10.1016/j.apcatb.2016.09.009
Gunnarsson, Fredrik, Pihl, Josh A., Toops, Todd J., Skoglundh, Magnus, and Härelind, Hanna. Sun .
"Lean NOx reduction over Ag/alumina catalysts via ethanol-SCR using ethanol/gasoline blends". United States. https://doi.org/10.1016/j.apcatb.2016.09.009. https://www.osti.gov/servlets/purl/1327667.
@article{osti_1327667,
title = {Lean NOx reduction over Ag/alumina catalysts via ethanol-SCR using ethanol/gasoline blends},
author = {Gunnarsson, Fredrik and Pihl, Josh A. and Toops, Todd J. and Skoglundh, Magnus and Härelind, Hanna},
abstractNote = {This paper 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. Finally, 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.},
doi = {10.1016/j.apcatb.2016.09.009},
journal = {Applied Catalysis. B, Environmental},
number = ,
volume = 202,
place = {United States},
year = {Sun Sep 04 00:00:00 EDT 2016},
month = {Sun Sep 04 00:00:00 EDT 2016}
}
Web of Science
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