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Formation of nitrous oxide over Pt-Pd oxidation catalysts: Secondary emissions by interaction of hydrocarbons and nitric oxide

Lott, Patrick ORCID iD icon 1; Bastian, Simon 1; Többen, Heike; Zimmermann, Lisa; Deutschmann, Olaf ORCID iD icon 1,2
1 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)
2 Institut für Katalyseforschung und -technologie (IKFT), Karlsruher Institut für Technologie (KIT)

Abstract:

The interaction of hydrocarbons (HC) and nitric oxide (NO) over noble metal catalysts for exhaust gas after-treatment of lean-operated combustion engines can lead to secondary emissions, namely the formation of nitrous oxide (N$_2$O), which is a strong greenhouse gas calling for N$_2$O reduction concepts. By means of a series of light-off tests over state-of-the-art Pt-Pd oxidation catalysts, this study identifies the most critical catalyst operation regimes that should be avoided in order to minimize N$_2$O levels. Especially unsaturated HCs react with NO to form significant amounts of N$_2$O between 150 °C and 350 °C; an increasing HC/NOx ratio generally promotes N$_2$O formation, whereas the NO oxidation reaction is increasingly inhibited. Since low space velocities and fast catalyst heating allow for minimizing N$_2$O levels, active heating of catalytic converters during cold start and phases of low exhaust gas temperatures may efficiently reduce the formation of N$_2$O in real-world applications.


Verlagsausgabe §
DOI: 10.5445/IR/1000155451
Veröffentlicht am 02.02.2023
Originalveröffentlichung
DOI: 10.1016/j.apcata.2023.119028
Scopus
Zitationen: 5
Web of Science
Zitationen: 2
Dimensions
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 02.2023
Sprache Englisch
Identifikator ISSN: 0926-860X, 1873-3875
KITopen-ID: 1000155451
HGF-Programm 38.03.02 (POF IV, LK 01) Power-based Fuels and Chemicals
Erschienen in Applied Catalysis A: General
Verlag Elsevier
Band 651
Seiten Art.-Nr.: 119028
Vorab online veröffentlicht am 10.01.2023
Schlagwörter Emission control, HC-deNOx, Nitrous oxide, Pt-Pd catalyst, Secondary emissions
Nachgewiesen in Dimensions
Scopus
Web of Science
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