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

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

doi:10.1016/j.apcatb.2016.09.009

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

Journal Article · Sun Sep 04 00:00:00 EDT 2016 · Applied Catalysis. B, Environmental

DOI:https://doi.org/10.1016/j.apcatb.2016.09.009· OSTI ID:1327667

Gunnarsson, Fredrik ^[1]; Pihl, Josh A. ^[2]; Toops, Todd J. ^[2]; Skoglundh, Magnus ^[1];

^[1]

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

This paper 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. Finally, 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Chalmers University of Technology, Gothenburg (Sweden)

Sponsoring Organization:: USDOE; Swedish Energy Agency (Sweden); Knut and Alice Wallenberg Foundation (Sweden)

Grant/Contract Number:: AC05-00OR22725; Dnr KAW 2005.0055

OSTI ID:: 1327667

Journal Information:: Applied Catalysis. B, Environmental, Vol. 202; ISSN 0926-3373

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 31 works

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

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