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Influence of Syngas Composition on the Kinetics of Fischer–Tropsch Synthesis of using Cobalt as Catalyst

Titelangaben

Pöhlmann, Ferdinand ; Jess, Andreas:
Influence of Syngas Composition on the Kinetics of Fischer–Tropsch Synthesis of using Cobalt as Catalyst.
In: Energy Technology. Bd. 4 (Januar 2016) Heft 1 . - S. 55-64.
ISSN 2194-4296
DOI: https://doi.org/10.1002/ente.v4.1

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Link zum Volltext (externe URL): Volltext

Abstract

A promising method for the utilization of CO₂ (e.g., captured from the flue gases of gas- or coal-based power plants) is the production of liquid hydrocarbons from CO₂ and renewable H₂ (power to liquid, PTL). This is a three-step process and consists of water electrolysis, reverse water–gas shift (RWGS), and Fischer–Tropsch synthesis (FTS). Here, the syngas for the FTS always contains CO₂ owing to the incomplete conversion of CO₂ in the RWGS reactor because of thermodynamic constraints. Therefore, the influence of not only the main reactants CO and H₂ but also CO₂ on the kinetics of FTS using a homemade cobalt catalyst was studied. Moreover, under effective conditions (i.e., with particles of millimeter size, as used in fixed-bed reactors), the FTS is affected by internal mass-transport limitations, which lead to an increased H₂/CO ratio inside the particle, which has an impact on the local reaction rate and selectivity. Therefore, the effect of the H₂/CO ratio was studied in a broad range of 0.5 to 40 at temperatures of 210 to 230 °C at a total pressure of approximately 3 MPa. With increasing H₂/CO ratio and a surplus of H₂, the methane selectivity rises and the selectivity to higher hydrocarbons decreases. As long as a certain (very low) amount of CO is present, CO₂ behaves like an inert component. However, for particle sizes of several millimeters and pronounced pore diffusion limitations, the CO concentration decreases towards the particle center and a core region free of CO is formed. At H₂/CO ratios >10, CO₂ is also converted (but practically solely to methane). The intrinsic kinetic parameters of the reaction rates were evaluated by using Langmuir–Hinshelwood-type rate expressions. The selectivities were also described by a model from Vervloet et al.1 The used models are in good agreement with the experimental results.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: Special Issue: Energy, Science & Technology Conference
Keywords: cobalt; carbon dioxide; hydrocarbons; reaction kinetics; syngas
Institutionen der Universität: Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Chemische Verfahrenstechnik
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Chemische Verfahrenstechnik > Lehrstuhl Chemische Verfahrenstechnik - Univ.-Prof. Dr.-Ing. Andreas Jess
Forschungseinrichtungen > Forschungsstellen > ZET - Zentrum für Energietechnik
Forschungseinrichtungen
Forschungseinrichtungen > Forschungsstellen
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
600 Technik, Medizin, angewandte Wissenschaften > 660 Chemische Verfahrenstechnik
Eingestellt am: 11 Feb 2016 08:06
Letzte Änderung: 17 Mai 2017 07:16
URI: https://eref.uni-bayreuth.de/id/eprint/30606