Abstract
In the present study, barium-based NO x storage catalysts containing platinum, rhodium, or both noble metals were investigated. The influence of SO 2 exposure conditions on the performance of NO x storage catalysts was studied using flow reactor measurements, FTIR, and XPS where the samples were exposed to lean and/or rich SO 2-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 SO 2 is present in the feed under rich conditions than under lean or continuous SO 2 exposure. It was also found that SO 2 affects the performance of noble metals strongly and that noble metal deactivation most likely occurs during the rich period of a NO x 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 SO 2 exposure and subsequent regeneration.
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