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Sulphur poisoning and regeneration of NOx trap catalyst for direct injected gasoline engines

Sara Erkfeldt (Institutionen för kemisk reaktionsteknik ; Kompetenscentrum katalys (KCK)) ; Mikael Larsson ; Håkan Hedblom ; Magnus Skoglundh (Institutionen för teknisk ytkemi ; Kompetenscentrum katalys (KCK))
Society of Automotive Engineers Technical Paper Series Vol. 1999 (1999), SP-1476, p. 51-62.
[Artikel, refereegranskad vetenskaplig]

Sulphur poisoning and regeneration of NOx trap catalysts have been studied in synthetic exhausts and in an engine bench. Sulphur gradually poisoned the NO x storage sites in the axial direction of the NO x trap. During sulphur regenerations, hydrogen was found to be more efficient than carbon monoxide in removing the sulphur from the trap. The sulphur regeneration became more efficient the richer the environment (λ<1) and the higher the temperature (at least 600°C). H2S was found to be the main product during the sulphur regeneration. However, it was possible to reduce the H2S formation and instead produce more SO2 by running with lambda close to one or by pulsing lambda. Even if a relatively large amount of sulphur was removed from the NOx trap, these methods gave a much less efficient regeneration per sulphur atom removed than when running relatively rich constantly. Finally, a model that could explain this observation was proposed.



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Denna post skapades 2012-01-27. Senast ändrad 2017-09-14.
CPL Pubid: 154475

 

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Institutioner (Chalmers)

Institutionen för kemisk reaktionsteknik (1972-2001)
Kompetenscentrum katalys (KCK)
Institutionen för teknisk ytkemi (1999-2003)

Ämnesområden

Energi
Materialvetenskap
Nanovetenskap och nanoteknik
Transport
Hållbar utveckling
Kemiteknik

Chalmers infrastruktur