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Efficient low temperature lean NOx reduction over Ag/Al2O3-A system approach

Hannes Kannisto (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; X. Karatzas ; J. Edvardsson ; L. J. Pettersson ; Hanna Härelind Ingelsten (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK))
Applied Catalysis B-Environmental (0926-3373). Vol. 104 (2011), 1-2, p. 74-83.
[Artikel, refereegranskad vetenskaplig]

This study focuses on lean NOx reduction (LNR) by n-octane using silver-alumina based catalysts, with the addition of hydrogen. The work takes a system approach, where parameters such as temperature, reformate gas composition, fuel penalty and realistic monolith samples are considered. The LNR catalyst samples were prepared by impregnation and sol-gel methods and the NOx reduction performance was characterized by flow-reactor experiments, where realistic engine-out gas compositions were used. The hydrogen feed over the LNR catalyst samples was determined via data achieved by autothermal reforming experiments over a rhodium based catalyst, using real diesel as feedstock. The LNR catalyst samples generally show an enhanced NOx reduction when hydrogen is added to the gas feed. In particular, a 2 wt% silver-alumina sample with the addition of minute amounts of platinum, shows a high increase in NOx reduction when hydrogen is added to the feed. The addition of CO, a potential poison in the reaction and a by-product from the reforming, did not show any significant effect on the LNR catalyst performance at the conditions used. This is beneficial, since it renders a CO clean-up step in the reformer system unneeded. Ammonia formation is discussed in terms of a possible dual-SCR system. Finally, the fuel penalty for hydrogen production and hydrocarbon addition is taken into consideration. It is found that an addition of 1000 ppm H-2 leads to unacceptable fuel penalties. (C) 2011 Elsevier B.V. All rights reserved.

Nyckelord: Lean NOx reduction, Ag/Al2O3, Pt, Fuel reforming, Fuel economy, selective catalytic-reduction, silver-alumina catalysts, in-situ ftir, higher hydrocarbons, nitric-oxide, silver/alumina catalyst, nitrogen-oxides, engine exhaust, rhodium-oxide, diesel

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Denna post skapades 2011-06-10. Senast ändrad 2012-03-02.
CPL Pubid: 141519


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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Teknisk ytkemi (2005-2014)
Kompetenscentrum katalys (KCK)


Nanovetenskap och nanoteknik
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Chalmers infrastruktur