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Dynamic modelling of a gas phase catalytic fixed-bed reactor—I: Experimental apparatus and determination of reaction kinetics

✍ Scribed by Knud Waede Hansen; Sten Bay Jørgensen

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
737 KB
Volume
31
Category
Article
ISSN
0009-2509

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✦ Synopsis

A lange scale Bxed bed pilot reactor for performing dynamic experiments is described. The reactor system is especially designed to suppress secondary dispersion effects not characteristic for the packed bed itself.

As a model reaction the reaction between oxygen (~1%) and hydrogen on a platinum catalyst supported by alumina has been used.

Differential reactor experiments disclosed a bysteresis phenomenon in the catalyst activity. The catalyst is generally more active when going from high to low temperatures than vice versa.

AglobalfirstorderreactionrateexpressionwithArrheniustemperaturedependencyfitsthefixed-bedreactorprofiles well but the static gains badly. However by simultaneous estimation of frequency factor and activation energy in several axial segments a much better approximation to the static gains was obtained. This result indicates that the reaction kinetics is more complicated than first assumed. However for dynamic modelling the exact reaction mechanism is not needed.

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