Mass transfer limitations in photocatalytic reactors employing titanium dioxide suspensions I. Concentration profiles in the bulk

The possibility of mass transport limitations in the bulk of photocatalytic suspensions of pure titanium dioxide is studied. The investigation is based on fundamental principles and a realistic kinetics derived from a complete reaction mechanisms. It is found that concentration profiles in the bulk...

Full description

Saved in:
Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2008-02, Vol.136 (1), p.50-65
Main Authors: DE LOS MILAGROS BALLARI, Maria, BRANDI, Rodolfo, ALFANO, Orlando, CASSANO, Alberto
Format: Article
Language:English
Subjects:
Applied sciences
Catalysis
Catalytic reactions
Chemical engineering
Chemistry
Exact sciences and technology
General and physical chemistry
Heat and mass transfer. Packings, plates
Reactors
Sintering, pelletization, granulation
Solid-solid systems
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The possibility of mass transport limitations in the bulk of photocatalytic suspensions of pure titanium dioxide is studied. The investigation is based on fundamental principles and a realistic kinetics derived from a complete reaction mechanisms. It is found that concentration profiles in the bulk will be always present unless very good mixing conditions in the characteristic direction of radiation propagation are used. The results suggest that the combination of high irradiation rates with high catalyst loading should be used with great care, particularly if the reaction kinetics is not known, because mass transfer limitations may be present. In flow reactors, when fully developed turbulent flow operation is achieved, these mass transfer limitations are almost negligible.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2007.03.028