Effective dispersion model for flow-through catalytic membrane reactors combining axial dispersion and pore size distribution |
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Authors: | Thomas Westermann Nicole Kopriwa Alexander Schröder Thomas Melin |
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Affiliation: | Aachener Verfahrenstechnik (AVT) – Chemical Process Engineering, RWTH Aachen University, 52056 Aachen, Germany |
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Abstract: | In a flow-through catalytic membrane reactor, catalyst is immobilized in the pores of a membrane, which is convectively passed by the reaction mixture, allowing for high catalytic activity and a potentially narrow residence time distribution (RTD). As the membrane geometry prevents measurement of a meaningful RTD, a residence time distribution model is introduced, which accounts for deviations from ideal plug flow behavior induced by a non-ideal pore size distribution and by axial molecular diffusion. Both effects are combined to an effective dispersion model with a single dimensionless parameter, which is a function of pore geometry, axial velocity and molecular diffusion coefficient. As a result of the developed model, recommendations for optimum reactor operation are given. |
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