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Theoretical investigation of axially non-uniform catalytic monoliths for methane combustion

Cominos, V; Gavriilidis, A; (2001) Theoretical investigation of axially non-uniform catalytic monoliths for methane combustion. CHEM ENG SCI , 56 (11) 3455 - 3468.

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Abstract

A two-dimensional mathematical model was formulated to investigate the effect of axially non-uniform catalyst distribution on temperature and concentration gradients in catalytic monoliths for typical steady state and transient methane combustion conditions. It was observed that exponentially decreasing catalyst distributions initiated light-off at the entrance of the monolith and temperature gradients were lower as compared to monoliths with uniform catalyst distribution under steady stale conditions. Bulk fluid temperature suitable for homogeneous reactions initiation was reached further upstream. For transient conditions, non-uniform distributions alleviated axial temperature gradients but at the expense of temporal gradients. As temperature gradients are linked to thermal stresses, this work indicates that non-uniform distributions can affect monolith thermal stability. (C) 2001 Elsevier Science Ltd. All rights reserved.

Type: Article
Title: Theoretical investigation of axially non-uniform catalytic monoliths for methane combustion
Keywords: catalytic combustion, modelling, non-uniform catalyst distribution, GAS-TURBINE APPLICATIONS, MATHEMATICAL-MODELS, HEAT-TRANSFER, REACTOR, CONVERTERS, TEMPERATURE, TECHNOLOGY, EMISSIONS, SYSTEMS, DESIGN
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/129194
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