Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10244704 | Journal of Catalysis | 2005 | 13 Pages |
Abstract
Flow reactor experiments were performed to study the effect of SO2Â +Â O2 and SO2Â +Â H2 exposures on the NOx storage performance of Pt/BaO/Al2O3 and BaO/Al2O3 catalysts. In addition, Pt/SiO2 samples were used to study the interaction between Pt and SO2 under the two exposure conditions. For BaO/Al2O3 the two SO2 exposure conditions caused similar deactivation of the NOx storage capacity, whereas for Pt/BaO/Al2O3 the decline in the NOx storage capacity was faster during the SO2Â +Â H2 exposure than for SO2Â +Â O2 exposure. The presence of Pt enhances the adsorption of SO2 for both SO2 exposure conditions. Quantitative analysis of sulfur showed that exposure to SO2Â +Â O2 caused higher accumulation of sulfur in Pt/BaO/Al2O3 samples in comparison with SO2Â +Â H2 exposure. Thus there is no correlation between the total amount of adsorbed sulfur in the samples and the reduction of the NOx storage capacity, probably because of the adsorption of sulfur on sites not necessarily important for the NOx storage process.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Catalysis
Authors
Jazaer Dawody, Magnus Skoglundh, Louise Olsson, Erik Fridell,