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Title: Effect of mass transfer and catalyst layer thickness on photocatalytic reaction

Abstract

Semiconductor photocatalytic processes have been studied for nearly 20 years due to their intriguing advantages in environmental remediation. A rational approach in determining the effect of mass transfer and catalyst layer thickness during photocatalytic reactions is proposed. The reaction occurs at the liquid-catalyst interface, and therefore when the catalyst is immobilized, both external and internal mass transfer plays significant roles in overall photocatalytic processes. Several model parameters--external mass-transfer coefficient, dynamic adsorption equilibrium constant, adsorption rate constant, internal mass-transfer coefficient, and effective diffusivity--were determined either experimentally or by fitting realistic models to experimental results using benzoic acid as a model component. Even though all these parameters are critical to the design and development of photocatalytic processes, they are not available in the literature. The effect of the internal mass transfer on the photocatalytic degradation rate over different catalyst layer thicknesses under two different operating configurations was analyzed theoretically and experimentally verified. It was observed that an optimal catalyst layer thickness exists for substrate-to-catalyst illumination.

Authors:
; ;
Publication Date:
Research Org.:
National Univ. of Singapore (SG)
OSTI Identifier:
20080312
Resource Type:
Journal Article
Journal Name:
AIChE Journal (American Institute of Chemical Engineers)
Additional Journal Information:
Journal Volume: 46; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0001-1541
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; SEMICONDUCTOR MATERIALS; CATALYSTS; PHOTOCHEMICAL REACTIONS; MASS TRANSFER; AIR POLLUTION CONTROL; WATER GAS PROCESSES; MATERIALS RECOVERY; WASTE WATER

Citation Formats

Chen, D., Li, F., and Ray, A.K. Effect of mass transfer and catalyst layer thickness on photocatalytic reaction. United States: N. p., 2000. Web. doi:10.1002/aic.690460515.
Chen, D., Li, F., & Ray, A.K. Effect of mass transfer and catalyst layer thickness on photocatalytic reaction. United States. doi:10.1002/aic.690460515.
Chen, D., Li, F., and Ray, A.K. Mon . "Effect of mass transfer and catalyst layer thickness on photocatalytic reaction". United States. doi:10.1002/aic.690460515.
@article{osti_20080312,
title = {Effect of mass transfer and catalyst layer thickness on photocatalytic reaction},
author = {Chen, D. and Li, F. and Ray, A.K.},
abstractNote = {Semiconductor photocatalytic processes have been studied for nearly 20 years due to their intriguing advantages in environmental remediation. A rational approach in determining the effect of mass transfer and catalyst layer thickness during photocatalytic reactions is proposed. The reaction occurs at the liquid-catalyst interface, and therefore when the catalyst is immobilized, both external and internal mass transfer plays significant roles in overall photocatalytic processes. Several model parameters--external mass-transfer coefficient, dynamic adsorption equilibrium constant, adsorption rate constant, internal mass-transfer coefficient, and effective diffusivity--were determined either experimentally or by fitting realistic models to experimental results using benzoic acid as a model component. Even though all these parameters are critical to the design and development of photocatalytic processes, they are not available in the literature. The effect of the internal mass transfer on the photocatalytic degradation rate over different catalyst layer thicknesses under two different operating configurations was analyzed theoretically and experimentally verified. It was observed that an optimal catalyst layer thickness exists for substrate-to-catalyst illumination.},
doi = {10.1002/aic.690460515},
journal = {AIChE Journal (American Institute of Chemical Engineers)},
issn = {0001-1541},
number = 5,
volume = 46,
place = {United States},
year = {2000},
month = {5}
}