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Homogeneous conversion of NO$_{x}$ and NH$_{3}$ with CH$_{4}$, CO, and C$_{2}$H$_{4}$ at the diluted conditions of exhaust-gases of lean operated natural gas engines [in press]

Schmitt, Steffen; Schwarz, Sabrina; Ruwe, Lena; Horstmann, Jacqueline; Sabath, Franziska; Maier, Lubow; Deutschmann, Olaf; Kohse-Höinghaus, Katharina

Abstract:
Understanding gas‐phase reactions in model gas mixtures approximating pre‐turbine heavy‐duty natural gas engine exhaust compositions containing NO, NH$_{3}$, NO$_{2}$, CH$_{4}$, CO, and C$_{2}$H$_{4}$ is extremely relevant for aftertreatment procedure and catalyst design and is thus addressed in this work. In a plug‐flow reactor at atmospheric pressure, five different model gas mixtures were investigated in the temperature range of 700‐1 200 K, using species analysis with electron ionization molecular‐beam mass spectrometry. The mixtures were designed to reveal influences of individual components by adding NO$_{2}$, CH$_{4}$, CO, and C$_{2}$H$_{4}$ sequentially to a highly argon‐diluted NO/NH$_{3}$ base mixture. Effects of all components on the reactivity for NO$_{x}$ conversion were investigated both experimentally as well as by comparison with three selected kinetic models. Main results show a significantly increased reactivity upon NO$_{2}$ and hydrocarbon addition with lowered NO conversion temperatures by up to 200 K. Methane was seen to be of dominant influence in the carbon‐containing mixtures regarding interactions between the carbon and nitrogen chemistry as well as formaldehyde formation. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000125349
Veröffentlicht am 28.10.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Institut für Katalyseforschung und -technologie (IKFT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0538-8066, 1097-4601
KITopen-ID: 1000125349
Erschienen in International journal of chemical kinetics
Vorab online veröffentlicht am 25.10.2020
Schlagwörter ammonia, exhaust gas aftertreatment, gas-phase kinetics, natural gas engines, nitric oxide
Nachgewiesen in Scopus
Web of Science
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