Numerical modeling of stagnation-flows on porous catalytic surfaces: CO oxidation on Rh/Al2O3

Hüseyin Karadeniz, Canan Karakaya, Steffen Tischer, Olaf Deutschmann

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Abstract

A stagnation-flow on a catalytic porous plate is modeled one-dimensionally coupled with multi-step surface reaction mechanisms and molecular transport (diffusion and conduction) in the flow field and the porous catalyst. Internal mass transport inside the porous catalyst is studied with three different models: instantaneous diffusion (infinitely fast mass transport), effectiveness factor, and one-dimensional reaction-diffusion equations. A new computer code, DETCHEMSTAG, is presented to execute the numerical model. The oxidation of CO over a porous Rh/Al2O3 surface is studied exemplarily. Experimental measurements are carried out to apply the developed model and the computer code. External and the internal mass transfer effects in front of and inside the porous catalyst are discussed. Internal mass transfer limitations become important in case of a thick catalyst layer for accurately predicting the experimental results.

Original languageEnglish
Pages (from-to)899-907
Number of pages9
JournalChemical Engineering Science
Volume104
DOIs
StatePublished - Dec 18 2013
Externally publishedYes

Funding

We deeply appreciate helpful discussions with R. J. Kee from Colorado School of Mines on stagnation-flow reactor modelling. Financial support by the Steinbeis Technologietransfer GmbH and the Deutsche Forschungsgemeninschaft (DFG) are gratefully acknowledged.

FundersFunder number
Deutsche Forschungsgemeninschaft
Steinbeis Technologietransfer GmbH

    Keywords

    • CO oxidation
    • Heterogeneous catalysis
    • Internal mass transfer limitation
    • Rhodium
    • Stagnation-flow reactor

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