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Effect of Impurities on the Initiation of the Methanol-to-Olefins Process: Kinetic Modeling Based on Ab Initio Rate Constants

Amsler, Jonas; Plessow, Philipp Nikolaus; Studt, Felix

Abstract:
The relevance of a selection of organic impurities for the initiation of the MTO process was quantified in a kinetic model comprising 107 elementary steps with ab initio computed reaction barriers (MP2:DFT). This model includes a representative part of the autocatalytic olefin cycle as well as a direct initiation mechanism starting from methanol through CO-mediated direct C–C bond formation. We find that the effect of different impurities on the olefin evolution varies with the type of impurity and their partial pressures. The reactivity of the considered impurities for initiating the olefin cycle increases in the order formaldehyde < di-methoxy methane < CO < methyl acetate < ethanol < ethene < propene. In our kinetic model, already extremely low quantities of impurities such as ethanol lead to faster initiation than through direct C–C bond formation which only matters in complete absence of impurities. Graphic Abstract: [Figure not available: see fulltext.]

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Verlagsausgabe §
DOI: 10.5445/IR/1000129108
Veröffentlicht am 29.01.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 06.01.2021
Sprache Englisch
Identifikator ISSN: 1011-372X, 1572-879X
KITopen-ID: 1000129108
Erschienen in Catalysis letters
Verlag Springer
Schlagwörter Ab initio, DFT, Impurities, Kinetic modeling, MTO initiation
Nachgewiesen in Dimensions
Web of Science
Scopus
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