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Investigations of sulphur deactivation of NOx storage catalysts: influence of sulphur carrier and exposure conditions

Annika Amberntsson (Institutionen för teknisk fysik ; Kompetenscentrum katalys (KCK)) ; Magnus Skoglundh (Institutionen för teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Martin Jonsson (Institutionen för teknisk fysik ; Kompetenscentrum katalys (KCK)) ; Erik Fridell (Institutionen för teknisk fysik ; Kompetenscentrum katalys (KCK))
Catalysis Today (0920-5861). Vol. 73 (2002), 3-4, p. 279-286.
[Artikel, refereegranskad vetenskaplig]

The influence of SO2, H2S and COS in low concentrations on the deactivation of PURh/BaO/Al2O3 NOx storage catalysts was investigated. Different samples of the catalyst were exposed to synthetic gas mixtures mimicking lean/rich engine cycling in a mixed lean application at 400degreesC. The lean gas mixture contained 8 vol.% O2, 500 vol-ppm C3H6 and 400 vol-ppm NO balanced to 100 vol.% with Ar. The rich excursions were performed by switching off the oxygen supply. Sulphur, 25 vol-ppm of either SO2, H2S or COS, was added to the gas flow either during the lean, the rich or both periods. This procedure aimed at investigating the influence of the exposure conditions and therefore the lean and rich periods were kept equally long (5 min). In addition, thermodynamical calculations for the prevailing conditions were performed.

Nyckelord: sulphur deactivation; NOx; storage catalysts; sulphur carrier; H2S; COS; platinum; rhodium



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Denna post skapades 2009-01-26. Senast ändrad 2017-09-14.
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Institutioner (Chalmers)

Institutionen för teknisk fysik (1900-2015)
Kompetenscentrum katalys (KCK)
Institutionen för teknisk ytkemi (1999-2003)

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