Investigating dry reforming of methane with spatial reactor profiles and particle‐resolved CFD simulations |
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| Authors: | Gregor D Wehinger Matthias Kraume Viktor Berg Oliver Korup Katharina Mette Robert Schlögl Malte Behrens Raimund Horn |
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| Affiliation: | 1. Chemical and Process Engineering, Technische Universit?t Berlin, Berlin, Germany;2. Institute of Chemical Reaction Engineering, Hamburg University of Technology, Hamburg, Germany;3. Dept. of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Berlin, Germany;4. Inorganic Chemistry, University of Duisburg‐Essen, Essen, Germany |
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| Abstract: | Dry reforming of methane (DRM) over nickel in a fixed‐bed reactor of spheres was studied experimentally and with CFD simulations. Temperature and mole fraction profiles were measured in a dedicated profile reactor as function of axial coordinate. Particle‐resolved CFD simulations took into account conjugate heat transfer, surface‐to‐surface radiation, and surface reactions described by microkinetics. Energy transport of CFD simulations were verified by studying heat transfer without chemical reactions. DRM experiments could not be reproduced with the original microkinetics formulation, even with the axial temperature profile applied. A detailed analysis of the microkinetics showed that thermodynamic inconsistencies are present, which are amplified by high surface coverage of CO*. After modifying the mechanism the experiments could be reproduced. This study shows how complex interactions between local transport phenomena and local kinetics can be quantified without relying on transport correlations. © 2016 American Institute of Chemical Engineers AIChE J, 62: 4436–4452, 2016 |
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| Keywords: | dry reforming of methane fixed‐bed reactor synthesis gas spatial resolution computational fluid dynamics |
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