Sulphur poisoning and regeneration of NOx trap catalyst for direct injected gasoline engines
Journal article, 1999

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.

Author

Sara U Erkfeldt

Competence Centre for Catalysis (KCK)

Department of Chemical Reaction Engineering

Mikael Larsson

Håkan Hedblom

Magnus Skoglundh

Competence Centre for Catalysis (KCK)

Department of Applied Surface Chemistry

Society of Automotive Engineers Technical Paper Series

Vol. 1999 SP-1476 51-62

Driving Forces

Sustainable development

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Transport

Energy

Materials Science

Subject Categories

Chemical Engineering

DOI

10.4271/1999-01-3504

More information

Created

10/7/2017