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133 results on '"Pettersson, Lars J."'

26. Assessment of the Impact of Trace Elements in FAME Biodiesel on Diesel Oxidation Catalyst Activity after Full Lifetime of Operation in A Heavy-Duty Truck

Author

Granestrand, Jonas, París, Rodrigo Suárez, Nilsson, Marita, Regali, Francesco, and Pettersson, Lars J.

Subjects
poisoning, lcsh:Chemistry, diesel oxidation catalyst, lcsh:QD1-999, biodiesel, lcsh:TP1-1185, phosphorus, Pt/Pd, lcsh:Chemical technology
Abstract

Fatty acid methyl ester (FAME) biodiesel contains some trace amounts of Na, K, P, Ca, and Mg. Our objective was to investigate whether the presence of such elements can poison a diesel oxidation catalyst that has been used for an entire regulatory lifetime in a heavy-duty truck fueled by FAME biodiesel. The investigated vehicle-aged catalyst contained high loadings of S, P, and Na, as well as a visible layer of soot. Activity in the NO oxidation reaction was severely decreased compared to a fresh catalyst of the same type, while the CO and C3H6 oxidation reactions were less affected. Subsequent selective trace element removal procedures, followed by activity tests, were used to decouple the effect of different poisons. Sintering was observed to be the main cause of catalyst deactivation. Of the trace elements present on the catalyst, P had the greatest effect on catalyst activity, while the other trace elements had little effect.

Published
2020

49. Insights into sulfur poisoning and regeneration of Cu-SSZ-13 catalysts: in situCu and S K-edge XAS studiesElectronic supplementary information (ESI) available: S K-edge XAS of reference compounds; 3D plots of Cu K-edge XAS data; PCA of Cu K-edge XAS data; FT EXAFS of pure components; WT EXAFS of pure components; backscattering amplitude factors; MCR-ALS using five components. See DOI: 10.1039/d1cy00975c

Author

Mesilov, Vitaly, Dahlin, Sandra, Bergman, Susanna L., Hammershøi, Peter S., Xi, Shibo, Pettersson, Lars J., and Bernasek, Steven L.

Abstract

In situCu and S K-edge X-ray absorption spectroscopy (XAS) was used for the investigation of sulfur-poisoned and regenerated Cu-SSZ-13 selective catalytic reduction (SCR) catalysts. Highly dispersed sulfur in the oxidation state +6 was found in the catalysts. Even though a similar amount of sulfur was deposited in the catalysts poisoned at both 200 and 500 °C, a higher fraction of sulfur-free Cu species was seen for the catalyst poisoned at the higher temperature. Regeneration at 550 °C resulted in more sulfur-free Cu species in the catalyst poisoned at 500 °C, even though a higher amount of sulfur was detected in this catalyst compared to the regenerated catalyst poisoned at 200 °C. Inconsistencies between the amount of sulfur and the fraction of sulfur-free Cu species were attributed to the additional sulfur storage at sites that do not involve Cu. It was suggested that increased temperature of poisoning may facilitate the formation of Al sulfates along with Cu sulfates. These results provide the next step in detailed understanding of sulfur poisoning and regeneration of Cu-SSZ-13 catalysts.

Published
2021
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