Abstract
In this study, Pd/Al 2O 3 and Pd/BaO/Al 2O 3 metallic monoliths were used to investigate the effect of BaO in C 2H 4 and CO oxidation as well as in NO reduction. A FT-IR gas analyser was used to study the activity of the catalysts. Several activity experiments carried out with dissimilar feedstreams revealed that BaO enhances CO and C 2H 4 oxidation as well as NO reduction reactions in rich conditions. This effect is due to BaO, which causes a decrease in the ethene poisoning of palladium. In lean conditions BaO is present in the form of Ba(OH) 2 which reacts with oxidised NO releasing water. Therefore, NO was stored during the lean reaction.
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