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A reaction engineering approach to kinetic analysis of photocatalytic reactions in slurry systems

Paper ID Volume ID Publish Year Pages File Format Full-Text
53551 46974 2016 10 PDF Available
Title
A reaction engineering approach to kinetic analysis of photocatalytic reactions in slurry systems
Abstract

•In kinetics, use reaction rate per catalyst mass and specific rate of photon absorption.•With a “photodifferential” reactor kinetic analysis becomes easier.•If the optical thickness is below 2.5 the reactor is “photodifferential”.•Evaluate the radiant back-scattered flux to limit the errors in kinetic analysis.•Rigorous kinetic analysis is best accomplished with a proper mathematical model.

The knowledge of the rate equation is fundamental for the assessment of the activity of the photocatalytic material and for the study, design and optimization of photocatalytic reactors. In the case of photocatalytic reactions, the local volumetric rate of photon absorption (LVRPA) affects the reaction rate and its inherently uneven distribution within a “slurry” reactor makes complex a correct kinetic analysis. In the present work it is shown which are the critical aspects of the kinetic analysis in slurry reactors and how to carry out photocatalytic experiments to minimize the misinterpretations of the experimental results. In particular, the influence of the type of illumination and of the operating conditions (recirculation flow rate, optical thickness) are studied. For instance, it is shown that the average values of the reaction rate and of the rate of photon absorption give no direct insight on the intrinsic kinetic if the reactor is not uniformly illuminated and the optical thickness is beyond a given value, which is significantly higher than the one usually suggested in literature for a “safe” kinetic analysis. Furthermore, the estimation of the average rate of photon absorption must take into account the backscattering of radiation from the reactor. In any case, the utilization of a proper mathematical model allows carrying out a sound kinetic analysis also in critical situations as those which can arise with an illumination by LEDs.

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Keywords
Photocatalysis; Kinetic analysis; UVA LED; Rate of photon absorption; Radiant energy transfer equation
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A reaction engineering approach to kinetic analysis of photocatalytic reactions in slurry systems
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 259, Part 1, 1 January 2016, Pages 87–96
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us