Abstract
Experiments using FT-IR or combined XRD/XAS, both with simultaneous gas phase analysis by MS and chemiluminescence were performed to study reactions over model Pt/Ba/Al 2O 3 NO x storage and reduction catalysts (NSR). Particular attention was given to the interaction of SO 2 with the catalyst components and how these influenced the NO x release and reduction stages. Propene was employed as reductant in gas mixtures with/without SO 2. When catalyst was exposed to SO 2 in air, bulk BaSO 4 formation occurred readily but without eliminating all of the NO x storage capacity. When SO 2 was exposed to catalysts in competition with NO 2, no bulk sulphate was detected but a diminished NO x capacity was measured suggesting the presence of competing adsorbed SO x species. The latter, in the presence of reductant at higher temperatures, led to rapid displacement of stored NO x and inhibited carbonate formation.
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