Characterization of Pt-based oxidation catalyst : deactivated simultaneously by sulfur and phosphorus
Honkanen, Mari; Huuhtanen, Mika; Kärkkäinen, Marja; Kanerva, Tomi; Lahtonen, Kimmo; Väliheikki, Ari; Kallinen, Kauko; Keiski, Riitta L.; Vippola, Minnamari (2021-03-31)
Mari Honkanen, Mika Huuhtanen, Marja Kärkkäinen, Tomi Kanerva, Kimmo Lahtonen, Ari Väliheikki, Kauko Kallinen, Riitta L. Keiski, Minnamari Vippola, Characterization of Pt-based oxidation catalyst – Deactivated simultaneously by sulfur and phosphorus, Journal of Catalysis, Volume 397, 2021, Pages 183-191, ISSN 0021-9517, https://doi.org/10.1016/j.jcat.2021.03.026
© 2021 The Author(s). Published by Elsevier Inc.This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2021052731906
Tiivistelmä
Abstract
Simultaneous poisoning of sulfur + phosphorus on a platinum-based diesel oxidation catalyst was studied to gain a deeper understanding on the catalyst deactivation. Compared to a single poisoning (sulfur or phosphorus), the simultaneous poisoning had a severe effect on the catalyst activation: light-off temperature for 90% conversion of propene was not reached, this of carbon monoxide was much higher than expected, and the maximum conversion of nitrogen monoxide collapsed. With very comprehensive structural characterization by various methods (e.g. STEM-EDS, XPS, DRIFTS) used, we achieved to conclude an explanation for this. In the case of the S + P-poisoning of the catalyst, formed aluminum phosphate was found to block adsorption sites for sulfur species on alumina and sulfur adsorbs mainly on cerium oxides. In addition, sulfur species remain with and in the vicinity of the platinum particles blocking active sites.
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