Fixed bed photocatalytic reactor for formaldehyde degradation: Experimental and modeling study
Identifieur interne : 000514 ( Hal/Corpus ); précédent : 000513; suivant : 000515Fixed bed photocatalytic reactor for formaldehyde degradation: Experimental and modeling study
Auteurs : Annaëlle Cloteaux ; Fabien Gérardin ; Dominique Thomas ; Noël Midoux ; Jean-Claude AndréSource :
- 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.
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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><hal api="V3"><titleStmt><title xml:lang="en">Fixed bed photocatalytic reactor for formaldehyde degradation: Experimental and modeling study</title><author role="aut"><persName><forename type="first">Annaëlle</forename><surname>Cloteaux</surname></persName><email></email><idno type="halauthor">400576</idno><affiliation ref="#struct-211875"></affiliation></author><author role="aut"><persName><forename type="first">Fabien</forename><surname>Gérardin</surname></persName><email>fabien.gerardin@inrs.fr</email><idno type="halauthor">884658</idno><affiliation ref="#struct-90587"></affiliation></author><author role="aut"><persName><forename type="first">Dominique</forename><surname>Thomas</surname></persName><email>dominique.thomas@univ-lorraine.fr</email><idno type="halauthor">812685</idno><affiliation ref="#struct-211875"></affiliation></author><author role="aut"><persName><forename type="first">Noël</forename><surname>Midoux</surname></persName><email></email><idno type="halauthor">813615</idno><affiliation ref="#struct-211875"></affiliation></author><author role="aut"><persName><forename type="first">Jean-Claude</forename><surname>André</surname></persName><email></email><idno type="halauthor">222110</idno><affiliation ref="#struct-211875"></affiliation></author><editor role="depositor"><persName><forename>Dominique</forename><surname>Thomas</surname></persName><email>dominique.thomas@univ-lorraine.fr</email></editor></titleStmt><editionStmt><edition n="v1" type="current"><date type="whenSubmitted">2014-05-14 14:04:34</date><date type="whenWritten">2014</date><date type="whenModified">2016-05-10 16:53:19</date><date type="whenReleased">2014-05-14 14:04:34</date><date type="whenProduced">2014</date></edition><respStmt><resp>contributor</resp><name key="179924"><persName><forename>Dominique</forename><surname>Thomas</surname></persName><email>dominique.thomas@univ-lorraine.fr</email></name></respStmt></editionStmt><publicationStmt><distributor>CCSD</distributor><idno type="halId">hal-00990925</idno><idno type="halUri">https://hal.archives-ouvertes.fr/hal-00990925</idno><idno type="halBibtex">cloteaux:hal-00990925</idno><idno type="halRefHtml">Chemical Engineering Journal, Elsevier, 2014, 249, pp.121-129</idno><idno type="halRef">Chemical Engineering Journal, Elsevier, 2014, 249, pp.121-129</idno></publicationStmt><seriesStmt><idno type="stamp" n="CNRS">CNRS - Centre national de la recherche scientifique</idno><idno type="stamp" n="UNIV-LORRAINE">Université de Lorraine</idno><idno type="stamp" n="LRGP-UL">LRGP</idno></seriesStmt><notesStmt><note type="audience" n="2">International</note><note type="popular" n="0">No</note><note type="peer" n="1">Yes</note></notesStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Fixed bed photocatalytic reactor for formaldehyde degradation: Experimental and modeling study</title><author role="aut"><persName><forename type="first">Annaëlle</forename><surname>Cloteaux</surname></persName><idno type="halAuthorId">400576</idno><affiliation ref="#struct-211875"></affiliation></author><author role="aut"><persName><forename type="first">Fabien</forename><surname>Gérardin</surname></persName><email>fabien.gerardin@inrs.fr</email><idno type="halAuthorId">884658</idno><affiliation ref="#struct-90587"></affiliation></author><author role="aut"><persName><forename type="first">Dominique</forename><surname>Thomas</surname></persName><email>dominique.thomas@univ-lorraine.fr</email><idno type="halAuthorId">812685</idno><affiliation ref="#struct-211875"></affiliation></author><author role="aut"><persName><forename type="first">Noël</forename><surname>Midoux</surname></persName><idno type="halAuthorId">813615</idno><affiliation ref="#struct-211875"></affiliation></author><author role="aut"><persName><forename type="first">Jean-Claude</forename><surname>André</surname></persName><idno type="halAuthorId">222110</idno><affiliation ref="#struct-211875"></affiliation></author></analytic><monogr><idno type="halJournalId" status="VALID">11608</idno><idno type="issn">1385-8947</idno><title level="j">Chemical Engineering Journal</title><imprint><publisher>Elsevier</publisher><biblScope unit="volume">249</biblScope><biblScope unit="pp">121-129</biblScope><date type="datePub">2014</date></imprint></monogr></biblStruct></sourceDesc><profileDesc><langUsage><language ident="en">English</language></langUsage><textClass><keywords scheme="author"><term xml:lang="en">Photocatalysis</term><term xml:lang="en">Formaldehyde</term><term xml:lang="en">Reactor modeling</term><term xml:lang="en">Residence time distribution</term><term xml:lang="en">Kinetics</term></keywords><classCode scheme="halDomain" n="chim.geni">Chemical Sciences/Chemical engineering</classCode><classCode scheme="halTypology" n="ART">Journal articles</classCode></textClass><abstract xml:lang="en">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.</abstract></profileDesc></hal></record>Pour manipuler ce document sous Unix (Dilib)
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