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Lean NOx reduction ...
Lean NOx reduction over Ag/alumina catalysts via ethanol-SCR using ethanol/gasoline blends
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- Gunnarsson, Fredrik, 1983 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Pihl, J. A. (författare)
- Oak Ridge National Laboratory
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- Toops, T. J. (författare)
- Oak Ridge National Laboratory
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- Skoglundh, Magnus, 1965 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Härelind, Hanna, 1973 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- Elsevier BV, 2017
- 2017
- Engelska.
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Ingår i: Applied Catalysis B: Environmental. - : Elsevier BV. - 0926-3373 .- 1873-3883. ; 202, s. 42-50
- Relaterad länk:
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http://dx.doi.org/10...
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https://www.osti.gov...
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Nyckelord
- HC-SCR
- Silver-alumina
- Lean NOx reduction
- Ag/Al2O3
- Platinum doping
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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