Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 202, Issue -, Pages 42-50Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2016.09.009
Keywords
Silver-alumina; Ag/Al2O3; HC-SCR; Platinum doping; Lean NOx reduction
Funding
- Swedish Energy Agency
- Knut and Alice Wallenberg Foundation [KAW 2005.0055]
- Area of Advance Transport
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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 degrees 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. (C) 2016 Elsevier B.V. All rights reserved.
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