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

Kannisto, Hannes, 1979 (författare)
Chalmers tekniska högskola,Chalmers University of Technology
Karatzas, Xanthias (författare)
KTH,Kemisk teknologi
Edvardsson, J. (författare)
Volvo Group
visa fler...
Pettersson, Lars J. (författare)
KTH,Kemisk teknologi
Härelind Ingelsten, Hanna, 1973 (författare)
Chalmers tekniska högskola,Chalmers University of Technology
visa färre...
 (creator_code:org_t)
Elsevier BV, 2011
2011
Engelska.
Ingår i: Applied Catalysis B: Environmental. - : Elsevier BV. - 0926-3373 .- 1873-3883. ; 104:1-2, s. 74-83
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • 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.

Ämnesord

NATURVETENSKAP  -- Kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)
NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)
TEKNIK OCH TEKNOLOGIER  -- Naturresursteknik -- Annan naturresursteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Environmental Engineering -- Other Environmental Engineering (hsv//eng)
TEKNIK OCH TEKNOLOGIER  -- Kemiteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Chemical Engineering (hsv//eng)

Nyckelord

selective catalytic-reduction
nitrogen-oxides
diesel
engine exhaust
Pt
silver-alumina catalysts
in-situ ftir
Ag/Al2O3
higher hydrocarbons
silver/alumina catalyst
Fuel reforming
Lean NOx reduction
Fuel economy
nitric-oxide
rhodium-oxide
Physical chemistry
Environmental engineering
Chemical engineering

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