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  Tandem promotion of iron catalysts by sodium-sulfur and nitrogen-doped carbon layers on carbon nanotube supports for the Fischer-Tropsch to olefins synthesis

Lama, S., Weber, J. L., Heil, T., Hofmann, J. P., Yan, R., de Jong, K. P., et al. (2018). Tandem promotion of iron catalysts by sodium-sulfur and nitrogen-doped carbon layers on carbon nanotube supports for the Fischer-Tropsch to olefins synthesis. Applied Catalysis A: General, 568, 213-220. doi:10.1016/j.apcata.2018.09.016.

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 Urheber:
Lama, Sandy1, Autor           
Weber, J. Lennart, Autor
Heil, Tobias2, Autor           
Hofmann, Jan P., Autor
Yan, Runyu1, Autor           
de Jong, Krijn P., Autor
Oschatz, Martin1, Autor           
Affiliations:
1Martin Oschatz, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2364733              
2Nadezda V. Tarakina, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2522693              

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Schlagwörter: Fischer-Tropsch synthesis, C–C olefins, Iron catalysts, Carbon supports, Electronic junction
 Zusammenfassung: Carbon nanotubes with various surface modifications are utilized as supports for iron species and the resulting catalysts are used for the Fischer-Tropsch synthesis of C2–C4 olefins with and without the addition of Na and S promoters. A layer of nitrogen-doped carbon on the carbon nanotube surface serves as an efficient promoter independent of the presence of Na/S. It leads to significantly faster catalyst activation as compared to the tubes without such a layer resulting from an electronic junction effect at the iron-support interface. The tandem of Na/S- plus N-doped carbon promoted catalysts provide a record high iron-time-yield of up to 94∙10−5molCO gFe-1 s-1 under industrially relevant Fischer-Tropsch conditions (340 °C, 10 bar, H2/CO = 2) and slow deactivation over more than 185 h of time on stream. Furthermore, this tandem promotion leads to enhanced C2–C4 olefin and C5+ selectivity along with reduced methanization as compared to the solely Na/S-promoted catalysts.

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Sprache(n): eng - English
 Datum: 2018
 Publikationsstatus: Erschienen
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 Identifikatoren: DOI: 10.1016/j.apcata.2018.09.016
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Titel: Applied Catalysis A: General
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Amsterdam : Elsevier
Seiten: - Band / Heft: 568 Artikelnummer: - Start- / Endseite: 213 - 220 Identifikator: ISSN: 0926-860X