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

Fredrik Gunnarsson (Kompetenscentrum katalys (KCK) ; Institutionen för kemi och kemiteknik, Teknisk ytkemi) ; J. A. Pihl ; T. J. Toops ; Magnus Skoglundh (Kompetenscentrum katalys (KCK) ; Institutionen för kemi och kemiteknik, Teknisk ytkemi) ; Hanna Härelind (Kompetenscentrum katalys (KCK) ; Institutionen för kemi och kemiteknik, Teknisk ytkemi)
Applied Catalysis B-Environmental (0926-3373). Vol. 202 (2017), p. 42-50.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Silver-alumina, Ag/Al2O3, HC-SCR, Platinum doping, Lean NOx reduction



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Denna post skapades 2016-12-09. Senast ändrad 2017-09-14.
CPL Pubid: 245992

 

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