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Sulphur deactivation of NOx storage catalysts; Influence exposure conditions and noble metal

Annika Amberntsson (Institutionen för teknisk fysik ; Kompetenscentrum katalys (KCK)) ; Magnus Skoglundh (Institutionen för material- och ytkemi, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Sten Ljungström (Institutionen för teknisk fysik ; Kompetenscentrum katalys (KCK)) ; Erik Fridell (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK))
Journal of Catalysis (0021-9517). Vol. 217 (2003), 2, p. 253-263.
[Artikel, refereegranskad vetenskaplig]

In the present study, barium-based NOx, storage catalysts containing platinum, rhodium, or both noble metals were investigated. The influence of SO2 exposure conditions on the performance of NOx storage catalysts was studied using flow reactor measurements, FTIR, and XPS where the samples were exposed to lean and/or rich SO2-containing gas mixtures, simulating the conditions in a mixed lean application. The main results show that all samples are sensitive to sulfur and that deactivation is faster when SO2 is present in the feed under rich conditions than under lean or continuous SO2 exposure. It was also found that SO2 affects the performance of noble metals strongly and that noble metal deactivation most likely occurs during the rich period of a NOx storage cycle. Additionally, the influence of the noble metals present in the catalysts was investigated with respect to sulfur sensitivity and it was found that a combination of platinum and rhodium seems to be preferable for retaining high performance (high NO oxidation and reduction activity) of the catalyst under SO2 exposure and subsequent regeneration.

Nyckelord: nitrogen oxide; NOx storage catalyst; NO oxidation; NO reduction; barium; sulfur; platinum; rhodium

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Denna post skapades 2009-01-26. Senast ändrad 2012-02-20.
CPL Pubid: 88902


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Institutioner (Chalmers)

Institutionen för teknisk fysik (1900-2015)
Kompetenscentrum katalys (KCK)
Institutionen för material- och ytkemi, Teknisk ytkemi (2002-2004)
Institutionen för teknisk fysik, Kemisk fysik (1900-2015)


Nanovetenskap och nanoteknik
Hållbar utveckling
Fysikalisk kemi
Kemisk fysik

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