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Experimental and Numerical Study of the Transient Behavior of a Catalytic Partial Oxidation Monolith

Schwiedernoch, R.; Tischer, S.; Correa, C.; Deutschmann, O.

The objective of this investigation is a better understanding of transient processes in catalytic monoliths. As an example, the light-o( of
the partial oxidation of methane to synthesis gas (H2 and CO) on a rhodium/alumina catalyst is studied experimentally and numerically.
Methane/oxygen/argon mixtures are fed at room temperature and atmospheric pressure into a honeycomb monolith, which is preheated
until ignition occurs. The exit gas-phase temperature and species concentrations are monitored by a thermocouple and mass spectroscopy,
respectively. In the numerical study, the time-dependent temperature distribution of the entire solid monolith structure and the
two-dimensional laminar reactive 2ow 3elds in the single monolith channels are simulated. A multi-stepheterogeneous reaction mechanism
is used, and the surface coverage with adsorbed species is calculated as function of the position in the monolith. During light-o(, complete
oxidation of methane to water and carbon dioxide occurs initially. Then, synthesis gas selectivity slowly increases with rising temperature.
2003 Elsevier Science Ltd. All rights reserved.

Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2003
Sprache Englisch
Identifikator ISSN: 0009-2509
KITopen ID: 1000004048
Erschienen in Chemical engineering science
Band 58
Heft 3/6
Seiten 633-642
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