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

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.
 [1] ;  [2] ;  [2] ;  [1] ;  [1]
  1. Chalmers Univ. of Technology, Gothenburg (Sweden). Dept. of Chemistry and Chemical Engineering. Competence Centre for Catalysis
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Fuels, Engines, and Emissions Research Center
Publication Date:
OSTI Identifier:
Grant/Contract Number:
AC05-00OR22725; Dnr KAW 2005.0055
Accepted Manuscript
Journal Name:
Applied Catalysis. B, Environmental
Additional Journal Information:
Journal Volume: 202; Journal ID: ISSN 0926-3373
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Chalmers Univ. of Technology, Gothenburg (Sweden)
Sponsoring Org:
USDOE; Swedish Energy Agency (Sweden); Knut and Alice Wallenberg Foundation (Sweden)
Country of Publication:
United States
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY Silver-alumina; Ag/Al2O3; HC-SCR; Platinum doping; Lean NOx reduction