Fixed bed photocatalytic reactor for formaldehyde degradation: Experimental and modeling study
Identifieur interne : 000417 ( Main/Exploration ); précédent : 000416; suivant : 000418Fixed bed photocatalytic reactor for formaldehyde degradation: Experimental and modeling study
Auteurs : Annaëlle Cloteaux [France] ; Fabien Gérardin [France] ; Dominique Thomas [France] ; Noël Midoux [France] ; Jean-Claude André [France]Source :
- Chemical Engineering Journal [ 1385-8947 ] ; 2014.
English descriptors
Abstract
Formaldehyde is toxic to humans and is classed as a category 1 carcinogen. Methods have been developed to degrade this compound, but for industrial application, relevant mathematical models are required. This study models a fixed bed photocatalytic reactor designed to degrade formaldehyde constituted of TiO2-coated Raschig rings illuminated by UV-A lamps. Initially, the reactor's hydraulic behavior was described based on an experimental residence time distribution. This model takes into account hydraulics, light distribution, chemical kinetics and mass transfer in the reactor. The dispersion model satisfactorily represented the reactor's hydraulic behavior. This model, combined with a Langmuir-Hinshelwood kinetic model, was then used to calculate variations in concentration at the reactor output. By adding the transfer flux between the bulk and the surface to the material balance equation, it is possible to distinguish between mass transfer and chemical reaction limitation and determine the chemical kinetics. Experimental data from different initial concentrations were used to calculate the Langmuir-Hinshelwood kinetic constants. The dispersion model with chemical reaction was validated under various irradiation and flow rate conditions. The results show that the fixed bed photocatalytic reactor efficiently degrades formaldehyde in an aqueous solution. The chemical constants of photocatalytic degradation obtained for formaldehyde are necessary parameters if this technology is to become the basis of industrial applications. This study provides a new tool, integrating mass transfer limitations and light distribution, to design photo-reactors.
Url:
Affiliations:
- France
- Grand Est, Lorraine (région)
- Metz, Nancy
- Centre national de la recherche scientifique, Laboratoire réactions et génie des procédés, Université de Lorraine
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Le document en format XML
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Methods have been developed to degrade this compound, but for industrial application, relevant mathematical models are required. This study models a fixed bed photocatalytic reactor designed to degrade formaldehyde constituted of TiO2-coated Raschig rings illuminated by UV-A lamps. Initially, the reactor's hydraulic behavior was described based on an experimental residence time distribution. This model takes into account hydraulics, light distribution, chemical kinetics and mass transfer in the reactor. The dispersion model satisfactorily represented the reactor's hydraulic behavior. This model, combined with a Langmuir-Hinshelwood kinetic model, was then used to calculate variations in concentration at the reactor output. By adding the transfer flux between the bulk and the surface to the material balance equation, it is possible to distinguish between mass transfer and chemical reaction limitation and determine the chemical kinetics. Experimental data from different initial concentrations were used to calculate the Langmuir-Hinshelwood kinetic constants. The dispersion model with chemical reaction was validated under various irradiation and flow rate conditions. The results show that the fixed bed photocatalytic reactor efficiently degrades formaldehyde in an aqueous solution. The chemical constants of photocatalytic degradation obtained for formaldehyde are necessary parameters if this technology is to become the basis of industrial applications. This study provides a new tool, integrating mass transfer limitations and light distribution, to design photo-reactors.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Grand Est</li><li>Lorraine (région)</li></region><settlement><li>Metz</li><li>Nancy</li></settlement><orgName><li>Centre national de la recherche scientifique</li><li>Laboratoire réactions et génie des procédés</li><li>Université de Lorraine</li></orgName></list><tree><country name="France"><region name="Grand Est"><name sortKey="Cloteaux, Annaelle" sort="Cloteaux, Annaelle" uniqKey="Cloteaux A" first="Annaëlle" last="Cloteaux">Annaëlle Cloteaux</name></region><name sortKey="Andre, Jean Claude" sort="Andre, Jean Claude" uniqKey="Andre J" first="Jean-Claude" last="André">Jean-Claude André</name><name sortKey="Gerardin, Fabien" sort="Gerardin, Fabien" uniqKey="Gerardin F" first="Fabien" last="Gérardin">Fabien Gérardin</name><name sortKey="Midoux, Noel" sort="Midoux, Noel" uniqKey="Midoux N" first="Noël" last="Midoux">Noël Midoux</name><name sortKey="Thomas, Dominique" sort="Thomas, Dominique" uniqKey="Thomas D" first="Dominique" last="Thomas">Dominique Thomas</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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