UV photocatalytic oxidation of paint solvent compounds in air using an annular TiO₂-supported reactor

BACKGROUND: One of the most important industrial sources of volatile organic compounds (VOCs) is related to coating and painting applications. In this sense, photocatalytic oxidation can become an innovative and promising alternative for the remediation of air polluted by VOCs. In this study the UV...

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Published in:Journal of chemical technology and biotechnology (1986) 2011-02, Vol.86 (2), p.273-281
Main Authors: Palau, Jordi, Penya-Roja, Josep M, Gabaldón, Carmen, Javier Álvarez-Hornos, Francisco, Sempere, Feliu, Martínez-Soria, Vicente
Format: Article
Language:English
Subjects:
Acetates
Adsorption
annular gas reactor
Applied sciences
Catalysis
Catalytic reactions
Chemical engineering
Chemistry
Exact sciences and technology
General and physical chemistry
Heat and mass transfer. Packings, plates
kinetics
Oxidation
Paints
Photocatalysis
photocatalytic degradation
Protective coatings
Reactors
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TiO2-supported catalyst
Titanium dioxide
Toluene
VOCs
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Summary:BACKGROUND: One of the most important industrial sources of volatile organic compounds (VOCs) is related to coating and painting applications. In this sense, photocatalytic oxidation can become an innovative and promising alternative for the remediation of air polluted by VOCs. In this study the UV photodegradation of m-xylene, toluene and n-butyl acetate, as representative compounds of paint solvents, was carried out in an annular reactor using a TiO₂-glass wool supported catalyst. RESULTS The removal of each component and their mixture, simulating an industrial emission, was evaluated under different operational conditions. A maximum elimination capacity of 12, 18 and 80 mg C m⁻³ s⁻¹ was reached for m-xylene, toluene and n-butyl acetate, respectively. A simple Langmuir-Hinshelwood kinetic model was used to match the experimental data. Photocatalytic oxidation was found to be more effective for all compounds when humidified air was used. CONCLUSIONS: No mass transfer limitation was found under the experimental conditions. n-butyl acetate was the easiest to degrade and m-xylene the most recalcitrant. In the abatement of the mixture, competitive adsorption between the pollutants was observed, with the degradation of toluene especially hindered. A nearly linear correlation was found between the UV light intensity and kinetic constants. Copyright
ISSN:0268-2575
1097-4660
1097-4660
DOI:10.1002/jctb.2515