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Modeling intrinsic kinetics in immobilized photocatalytic microreactors

Paper ID Volume ID Publish Year Pages File Format Full-Text
45913 46427 2014 8 PDF Available
Title
Modeling intrinsic kinetics in immobilized photocatalytic microreactors
Abstract

•First order reaction rate with both light independency and light dependency.•Experimental data for residence time, catalyst thickness and photon flux density.•Intrinsic k values on the order of magnitude of 101 s−1 are reported.•Criterion for neglecting light based on film thickness and absorption coefficient.•Internal effectiveness factor reveals both mass transfer and light limitations.

The article presents a simple model for immobilized photocatalytic microreactors following a first order reaction rate with either light independency or light dependency described by photon absorption carrier generation semiconductor physics. Experimental data obtained for various residence times, catalyst thicknesses and photon flux densities proved that the model is capable of describing the reactor performance. The extracted reaction rate constant reveals the intrinsic kinetics as both external and internal mass transport are accounted for. The effect of light is also considered by defining a criterion for neglecting light intensity based on film thickness and absorption coefficient. For the first time k values on the order of magnitude of 101 s−1 are reported. In the end, performance parameters are also derived for the light dependent model for which the internal effectiveness factor reveals both mass transfer and light limitations.

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Keywords
Photocatalysis; Microreactor; Intrinsic kinetics; Thiele modulus; Internal effectiveness factor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 150–151, 5 May 2014, Pages 93–100
Authors
, , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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