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Numerical Simulation of Methane and Propane Reforming Over a Porous Rh/Al$_{2}$O$_{3}$ Catalyst in Stagnation-Flows: Impact of Internal and External Mass Transfer Limitations on Species Profiles

Karadeniz, Hüseyin; Karakaya, Canan; Tischer, Steffen; Deutschmann, Olaf

Abstract:
Hydrogen production by catalytic partial oxidation and steam reforming of methane and propane towards synthesis gas are numerically investigated in stagnation-flow over a disc coated with a porous Rh/Al$_{2}$O$_{3}$ layer. A one-dimensional flow field is coupled with three models for internal diffusion and with a 62-step surface reaction mechanism. Numerical simulations are conducted with the recently developed computer code DETCHEM$^{STAG}$. Dusty-Gas model, a reaction-diffusion model and a simple effectiveness factor model, are alternatively used in simulations to study the internal mass transfer inside the 100 µm thick washcoat layer. Numerically predicted species profiles in the external boundary layer agree well with the recently published experimental data. All three models for internal diffusion exhibit strong species concentration gradients in the catalyst layer. In partial oxidation conditions, a thin total oxidation zone occurs close to the gas-washcoat interface, followed by a zone of steam and dry reforming of methane. Increasing the reactor pressure and decreasing the inlet flow velocity increases/decreases the external/internal mass transfer limitations. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000124584
Veröffentlicht am 13.10.2020
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: 2073-4344
KITopen-ID: 1000124584
Erschienen in Catalysts
Band 10
Heft 8
Seiten Art.-Nr.: 915
Vorab online veröffentlicht am 10.08.2020
Schlagwörter partial oxidation; steam reforming; internal mass transfer limitation; external mass transfer limitation; stagnation-flow reactor; methane; propane; rhodium
Nachgewiesen in Web of Science
Scopus
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